e424b5
Table of Contents

The information in this prospectus supplement and the accompanying prospectus is not complete and may be changed. This prospectus supplement and the accompanying prospectus are not an offer to sell these securities and are not soliciting an offer to buy these securities in any state where this offer or sale is not permitted.
Filed Pursuant to Rule 424(b)(5)
Registration No. 333-121615
Subject to Completion
Preliminary Prospectus Supplement dated April 11, 2005
PROSPECTUS SUPPLEMENT
(To prospectus dated January 14, 2005)
$220,000,000
(WHITING LOGO)
Whiting Petroleum Corporation
              % Senior Subordinated Notes due 2013
 
          We will pay interest on the notes on  and                     of each year, beginning                     , 2005. The notes will mature on                     , 2013. We may redeem some or all of the notes at any time on or after                     , 2009, at redemption prices described in this prospectus supplement. In addition, before                     , 2008, we may redeem up to 35% of the notes with the net proceeds of an equity offering. If we experience specific kinds of changes of control, we must offer to repurchase the notes.
          The notes will be unsecured and subordinated to our senior debt. The notes will rank equally with our outstanding 71/4% Senior Subordinated Notes due 2012 and with any senior subordinated debt we may incur in the future and will rank senior to any subordinated debt we may incur in the future. The notes will be guaranteed by certain of our subsidiaries on a senior subordinated basis. The notes will only be issued in denominations of $1,000.
          We do not intend to apply for listing of the notes on any securities exchange or for the inclusion of the notes on any automated dealer quotation system. Our common stock is traded on the New York Stock Exchange under the symbol “WLL.”
          Investing in the notes involves risks that are described in the “Risk Factors” section beginning on page S-14 of this prospectus supplement.
 
         
    Per Note   Total
         
Public offering price(1)
  %   $
Underwriting discount
  %   $
Proceeds, before expenses, to us
  %   $
  (1)  Plus accrued interest, if any, from                     , 2005, if settlement occurs after that date
          Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
          The notes will be ready for delivery in book-entry form through The Depository Trust Company on or about April      , 2005.
 
Joint Book-Running Managers
Merrill Lynch & Co. Lehman Brothers
 
Banc of America Securities LLC JPMorgan Wachovia Securities
A.G. Edwards KeyBanc Capital Markets
Petrie Parkman & Co. Raymond James
 
The date of this prospectus supplement is April      , 2005.


TABLE OF CONTENTS
Prospectus Supplement
         
    Page
     
    S-1  
    S-2  
    S-3  
    S-4  
    S-14  
    S-26  
    S-26  
    S-27  
    S-69  
    S-72  
    S-72  
Prospectus
         
    Page
     
    2  
    3  
    3  
    4  
    4  
    5  
    17  
    20  
    21  
    22  
    25  
    26  
    26  
ABOUT THIS PROSPECTUS SUPPLEMENT
          This document is in two parts. The first part is this prospectus supplement, which describes the specific terms of this offering. The second part, the accompanying prospectus, gives more general information, some of which may not apply to this offering. You should read the entire prospectus supplement, as well as the accompanying prospectus and the documents incorporated by reference that are described under “Where You Can Find More Information” in the accompanying prospectus. In the event that the description of this offering varies between this prospectus supplement and the accompanying prospectus, you should rely on the information contained in this prospectus supplement.
          You should rely only on the information contained in this prospectus supplement and the accompanying prospectus. We have not, and the underwriters have not, authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. You should assume that the information appearing in this prospectus supplement and the accompanying prospectus is accurate only as of the date on their respective front covers. Our business, financial condition, results of operations and prospects may have changed since those dates.
          In this prospectus supplement, “we,” “us,” “our” or “ours” refer to Whiting Petroleum Corporation.

S-1


Table of Contents

GLOSSARY OF CERTAIN OIL AND NATURAL GAS TERMS
          We have included below the definitions for certain oil and natural gas terms used in this prospectus supplement:
          “3-D seismic” Geophysical data that depict the subsurface strata in three dimensions. 3-D seismic typically provides a more detailed and accurate interpretation of the subsurface strata than 2-D, or two-dimensional, seismic.
          “Bbl” One stock tank barrel, or 42 U.S. gallons liquid volume, used in this prospectus supplement in reference to oil and other liquid hydrocarbons.
          “Bcf” One billion cubic feet of natural gas.
          “Bcfe” One billion cubic feet equivalent, determined using the ratio of six Mcf of natural gas to one Bbl of crude oil, condensate or natural gas liquids.
          “completion” The installation of permanent equipment for the production of oil or natural gas, or in the case of a dry hole, the reporting of abandonment to the appropriate agency.
          “Mcf” One thousand cubic feet of natural gas.
          “Mcf/d” One Mcf per day.
          “Mcfe” One thousand cubic feet equivalent, determined using the ratio of six Mcf of natural gas to one Bbl of crude oil, condensate or natural gas liquids.
          “Mcfe/d” One Mcfe per day.
          “MMbbls” Millions of barrels of oil or other liquid hydrocarbons.
          “MMbtu” One million British Thermal Units.
          “MMcf” One million cubic feet of natural gas.
          “MMcf/d” One MMcf per day.
          “MMcfe” One million cubic feet equivalent, determined using the ratio of six Mcf of natural gas to one Bbl of crude oil, condensate or natural gas liquids.
          “MMcfe/d” One MMcfe per day.
          “PDNP” Proved developed nonproducing.
          “PDP” Proved developed producing.
          “plugging and abandonment” Refers to the sealing off of fluids in the strata penetrated by a well so that the fluids from one stratum will not escape into another or to the surface. Regulations of many states require plugging of abandoned wells.
          “pre-tax PV10%” The present value of estimated future revenues to be generated from the production of proved reserves calculated in accordance with SEC guidelines, net of estimated lease operating expense, production taxes and future development costs, using price and costs as of the date of estimation without future escalation, without giving effect to non-property related expenses such as general and administrative expenses, debt service and depreciation, depletion and amortization, or Federal income taxes and discounted using an annual discount rate of 10%.
          “reservoir” A porous and permeable underground formation containing a natural accumulation of producible oil and/or natural gas that is confined by impermeable rock or water barriers and is individual and separate from other reservoirs.
          “working interest” The interest in an oil and natural gas property (normally a leasehold interest) that gives the owner the right to drill, produce and conduct operations on the property and a share of

S-2


Table of Contents

production, subject to all royalties, overriding royalties and other burdens and to all costs of exploration, development and operations and all risks in connection therewith.
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
          This prospectus supplement, the accompanying prospectus and the documents incorporated by reference contain statements that we believe to be “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than historical facts, including, without limitation, statements regarding our future financial position, business strategy, projected revenues, earnings, costs, capital expenditures and debt levels, and plans and objectives of management for future operations, are forward-looking statements. When used in this prospectus supplement, the accompanying prospectus or the documents incorporated by reference, words such as we “expect,” “intend,” “plan,” “estimate,” “anticipate,” “believe” or “should” or the negative thereof or variations thereon or similar terminology are generally intended to identify forward-looking statements. Such forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Some, but not all, of the risks and uncertainties include:
         • declines in oil or natural gas prices;
 
         • our level of success in exploitation, exploration, development and production activities;
 
         • our ability to obtain external capital to finance acquisitions;
 
         • our ability to identify and complete acquisitions and to successfully integrate acquired businesses, including our ability to realize cost savings from completed acquisitions;
 
         • unforeseen underperformance of or liabilities associated with acquired properties;
 
         • inaccuracies of our reserve estimates or our assumptions underlying them;
 
         • failure of our properties to yield oil or natural gas in commercially viable quantities;
 
         • uninsured or underinsured losses resulting from our oil and natural gas operations;
 
         • our inability to access oil and natural gas markets due to market conditions or operational impediments;
 
         • the impact and costs of compliance with laws and regulations governing our oil and natural gas operations;
 
         • risks related to our level of indebtedness;
 
         • our ability to replace our oil and natural gas reserves;
 
         • any loss of our senior management or technical personnel;
 
         • competition in the oil and natural gas industry;
 
         • risks arising out of our hedging transactions; and
 
         • other risks described in documents we incorporate by reference.
          We assume no obligation, and disclaim any duty, to update the forward-looking statements in this prospectus supplement, the accompanying prospectus or the documents we incorporate by reference.

S-3


Table of Contents

PROSPECTUS SUPPLEMENT SUMMARY
          This summary highlights information contained elsewhere in this prospectus supplement and the accompanying prospectus. This summary may not contain all of the information that may be important to you. You should read the entire prospectus supplement, the accompanying prospectus and the documents we incorporate by reference into this prospectus supplement and the accompanying prospectus carefully before making a decision to invest in our senior subordinated notes.
About Our Company
          We are engaged in oil and natural gas exploitation, acquisition, exploration and production activities primarily in the Rocky Mountains, Permian Basin, Gulf Coast, Michigan, Mid-Continent and California regions of the United States. Our focus is on pursuing growth projects that we believe will generate attractive rates of return and maintaining a balanced portfolio of lower risk, long-lived oil and natural gas properties that provide stable cash flows.
          Since our inception in 1980, we have built a strong asset base and achieved steady growth through both property acquisitions and exploitation activities. As of January 1, 2005, our estimated proved reserves totaled 865.4 Bcfe, of which 70.1% were classified as proved developed. These estimated reserves had a pre-tax PV10% value of approximately $1.85 billion, of which approximately 70% came from properties located in three states: Texas, North Dakota and Michigan. During 2004, we invested $606.9 million in acquisition, exploration and development activities, including $79.4 million for the drilling of 169 gross (79 net) wells. Of these new wells, 160 resulted in productive completions and 9 were unsuccessful, yielding a 95% success rate. We have budgeted approximately $130 million to $150 million for development drilling expenditures in 2005. Although we have no specific budget for acquisitions, we will also seek property acquisition opportunities that meet our rate of return criteria and complement our existing core properties.
          As of January 1, 2005, we had a balanced portfolio of oil and natural gas reserves, with approximately 39.3% of our proved reserves consisting of natural gas and approximately 60.7% consisting of oil. Our properties generally have long reserve lives and reasonably stable and predictable well production characteristics with a ratio of proved reserves to annual production (based on December 2004 production) of approximately 12.6 years.
          The following table summarizes our estimated proved reserves and pre-tax PV10% value within our core areas as of January 1, 2005 and our estimated December 2004 average daily production.
                                                   
    Proved Reserves    
         
        Pre-Tax    
        PV10%   December 2004
    Oil   Natural   Total   % Natural   Value   Average Daily
Core Area   (MMbbl)   Gas (Bcf)   (Bcfe)   Gas   (In millions)   Production (MMcfe)
                         
Rocky Mountains(1)
    42.9       62.9       320.4       19.6%     $ 604.5       70.5  
Permian Basin
    36.8       55.3       276.3       20.0%     $ 603.1       41.6  
Gulf Coast
    4.0       107.9       131.5       82.0%     $ 364.1       47.2  
Michigan
    1.8       85.7       96.7       88.7%     $ 198.5       20.0  
Mid-Continent
    2.1       17.0       29.4       57.7%     $ 53.1       5.4  
California
    0.0       11.1       11.1       100.0%     $ 28.3       3.3  
                                                 
 
Total
    87.6       339.9       865.4       39.3%     $ 1,851.6       188.0  
                                                 
 
(1)  Includes one field in Canada with total estimated proved reserves of 5.8 Bcfe and a pre-tax PV10% value of $13.2 million.

S-4


Table of Contents

Business Strategy
          Our goal is to generate significant free cash flow by investing in oil and gas projects with attractive rates of return on capital employed. We plan to achieve this goal by exploiting and developing our existing oil and natural gas properties and pursuing acquisitions of additional properties. Specifically, we have focused, and plan to continue to focus, on the following:
          Developing and Exploiting Existing Properties. We believe that there is significant value to be created by drilling the numerous identified undeveloped opportunities on our properties. As of January 1, 2005, we owned interests in approximately 752,000 gross (300,400 net) developed acres and approximately 608,800 gross (315,700 net) undeveloped acres that contain many exploitation opportunities. During 2004, we invested $79.4 million to drill 169 gross (79 net) wells. Of these new wells, 95% resulted in productive completions. For 2005, we have budgeted $130 million to $150 million for the further exploration and development of our properties.
          Pursuing Profitable Acquisitions. We have pursued and intend to continue to pursue acquisitions of properties that we believe to have exploitation and development potential comparable to our existing inventory of drilling locations. Our experienced team of management, engineering and geoscience professionals has developed and refined an acquisition program designed to increase reserves and complement our existing core properties, including identifying and evaluating acquisition opportunities, negotiating and closing purchases and managing acquired properties. To secure attractive realized commodity prices on a portion of our producing volumes, we periodically enter into derivative contracts, typically no-cost collars. We have funded our acquisition activity through a combination of internally generated cash flow and equity and debt issuances to maintain our strong financial position.
          During 2004, we completed seven separate acquisitions of producing properties with a combined purchase price of $535.1 million for estimated proved reserves as of the effective dates of the acquisitions of approximately 436.1 Bcfe, resulting in an aggregate cost of $1.23 per Mcfe of estimated proved reserves. Additionally, on March 31, 2005, we completed our acquisition of operated interests in five producing gas fields in the Green River Basin of Wyoming.
          Focusing on High Return Operated and Non-Operated Properties. We have historically acquired operated as well as non-operated properties that meet or exceed our rate of return criteria. For acquisitions of properties with additional development, exploitation and exploration potential, our focus has been on acquiring operated properties so that we can better control the timing and implementation of capital spending. In some instances, we have been able to acquire non-operated property interests at attractive rates of return that provided a foothold in a new area of interest or complemented our existing operations. We intend to continue to acquire both operated and non-operated interests to the extent they meet our return criteria and further our growth strategy.
Competitive Strengths
          We believe that our key competitive strengths lie in our diversified asset base, our experienced management and technical team and our commitment to efficient utilization of new technologies.
          Diversified Asset Base. As of January 1, 2005, we had interests in 6,970 productive wells across our six core geographical areas. This property base, as well as our continuing business strategy of acquiring and developing properties in our core operating areas, presents us with a large number of opportunities for successful development and exploitation and additional acquisitions. In addition, we maintain a balanced commodity mix with approximately 39.3% of our proved reserves consisting of natural gas and approximately 60.7% consisting of oil.
          Experienced Management Team. Our management team averages over 25 years of experience in the oil and natural gas industry. Our personnel have extensive experience in each of our core geographical areas and in all of our operational disciplines. In addition, each of our acquisition professionals has at least 20 years of experience in the evaluation, acquisition and operational assimilation of oil and natural gas properties.

S-5


Table of Contents

          Commitment to Technology. In each of our core operating areas, we have accumulated detailed geologic and geophysical knowledge and have developed significant technical and operational expertise. In recent years, we have developed considerable expertise in conventional and 3-D seismic imaging and interpretation. Our technical team has access to approximately 961 square miles of 3-D seismic data, digital well logs and other subsurface information. This data is analyzed with state of the art geophysical and geological computer resources dedicated to the accurate and efficient characterization of the subsurface oil and gas reservoirs that comprise our asset base. Computer applications, such as the WellView® software system, enable us to quickly generate reports and schematics on our wells. In addition, our information systems enable us to update our production databases through daily uploads from hand held computers in the field. This commitment to technology has increased the productivity and efficiency of our field operations development activities.
Resignation and Appointment of Chief Financial Officer
          Effective March 1, 2005, James R. Casperson resigned as our Vice President — Finance and Chief Financial Officer to pursue other interests. Also effective March 1, 2005, our Board of Directors appointed Michael J. Stevens, formerly our Controller and Treasurer, as our Vice President and Chief Financial Officer.
Green River Basin Acquisition
          On March 31, 2005, we completed our acquisition of operated interests in five producing gas fields in the Green River Basin of Wyoming. The purchase price was $65.0 million for estimated proved reserves as of the effective date of the acquisition of approximately 50.5 Bcfe, resulting in a cost of $1.29 per Mcfe of estimated proved reserves. We operate approximately 95% of the net daily production from the properties, which is currently 6.3 MMcfe/d. We funded the acquisition through borrowings under our wholly-owned subsidiary Whiting Oil and Gas Corporation’s credit agreement.
Revised Outlook for 2005
          On April 11, 2005, Whiting Petroleum Corporation announced preliminary first quarter 2005 production and updated guidance. Based on preliminary operating results for the first quarter of 2005, we revised our outlook for the first quarter as well as fiscal year 2005. Total production for the first quarter is expected to be 16.315 Bcfe versus 16.7 Bcfe in our prior guidance. This reduction is due to the impact of temporary pipeline shutdowns for repairs by a gas purchaser in our Yoakum and Word North Fields in South Texas as well as downtime for workover activity in the Big Stick Field in Billings County, North Dakota. These impacts reduced first quarter average daily production by approximately 7 MMcfe per day versus our December 2004 average daily production rate of 188 MMcfe per day. As a result of these production interruptions and increased operating expenses, our operating costs on a per-unit basis are expected to be higher than previously forecast.
          For the full year 2005, we revised our total production guidance to 65 Bcfe to 67 Bcfe from our original estimate of 69 Bcfe to 71 Bcfe. These estimates do not include production from the acquisition of Green River Basin properties for $65 million which closed on March 31, 2005, or any other acquisitions which may take place during the year. Including the Green River Basin acquisition, Whiting expects 2005 total production in the range of 67 Bcfe to 69 Bcfe.
          Our 2005 non-acquisition capital budget remains unchanged in the range of $130 million to $150 million.

S-6


Table of Contents

          Based on these revised production estimates, per-unit operating expenses for the first quarter and fiscal year are expected to fall within the ranges summarized below:
     
Operating Costs Per Mcfe:    
     
Lease operating expenses
  $1.25 - $1.28
General and administrative expense
  $0.40 - $0.42
Depreciation, depletion and amortization
  $1.25 - $1.28
Production taxes (% of oil and gas revenues)
  6.0% - 6.5%
          The projections presented above are based on current financial and operational information. We expect to release our complete results for the first quarter on April 25, 2005.
Corporate Information
          Whiting Petroleum Corporation was incorporated in Delaware on July 18, 2003 for the sole purpose of becoming a holding company of Whiting Oil and Gas Corporation in connection with our initial public offering. Whiting Oil and Gas Corporation was incorporated in Delaware in 1983.
          Our principal executive offices are located at 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, and our telephone number is (303) 837-1661.

S-7


Table of Contents

The Offering
          The following is a brief summary of some of the terms of this offering. For a more complete description of the terms of the senior subordinated notes, see “Description of Notes” in this prospectus supplement and “Description of Debt Securities” in the accompanying prospectus.
Issuer Whiting Petroleum Corporation
 
Notes offered $220,000,000 aggregate principal amount of      % senior subordinated notes due 2013.
 
Maturity date                     , 2013.
 
Interest payment dates                     and                     , beginning                     , 2005.
 
Ranking The notes will be unsecured senior subordinated obligations and will be subordinated to all of our senior debt. The notes will rank equally with our outstanding 71/4% Senior Subordinated Notes due 2012 and any senior subordinated debt we may incur in the future and will rank senior to any subordinated debt we may incur in the future.
 
As of March 31, 2005, after giving effect to this offering and the application of the net proceeds thereof as described under “Use of Proceeds,” we would have had total senior debt of approximately $3.2 million (excluding our guarantee of Whiting Oil and Gas Corporation’s credit agreement), senior subordinated debt of approximately $369.3 million consisting of the notes and our outstanding 71/4% Senior Subordinated Notes due 2012, no debt subordinated to the notes, and our operating subsidiary, Whiting Oil and Gas Corporation, would have had senior debt of approximately $0.2 million consisting of borrowings under its credit agreement and no other debt.
 
Optional redemption We will have the option to redeem the notes, in whole or in part, at any time on or after                     , 2009, at the redemption prices described in this prospectus supplement under the heading “Description of Notes — Optional Redemption,” together with any accrued and unpaid interest to the date of redemption.
 
Equity offering optional redemption. Before                     , 2008, we may, at any time or from time to time, redeem up to 35% of the aggregate principal amount of the notes with the net proceeds of a public or private equity offering at      % of the principal amount of the notes, plus any accrued and unpaid interest, if at least 65% of the aggregate principal amount of the notes issued under the indenture remains outstanding after such redemption and the redemption occurs within 120 days of the date of the closing of such equity offering.
 
Change of control When a change of control event occurs, each holder of notes may require us to repurchase all or a portion of its notes at a price equal to 101% of the principal amount of the notes, plus any accrued and unpaid interest.
 
Guarantees The notes will be unconditionally guaranteed, jointly and severally, by certain of our subsidiaries on a senior subordinated basis. All of our existing subsidiaries are restricted subsidiaries.

S-8


Table of Contents

Certain covenants The indenture governing the notes will contain covenants that, among other things, will limit our ability and the ability of our restricted subsidiaries to:
  pay dividends on, redeem or repurchase our capital stock or redeem or repurchase our subordinated debt,
 
  make investments,
 
  incur additional indebtedness or issue preferred stock,
 
  create certain liens,
 
  sell assets,
 
  enter into agreements that restrict dividends or other payments from our restricted subsidiaries to us,
 
  consolidate, merge or transfer all or substantially all of the assets of us and our restricted subsidiaries taken as a whole,
 
  engage in transactions with affiliates,
 
  create unrestricted subsidiaries, and
 
  enter into sale and leaseback transactions.
These covenants are subject to important exceptions and qualifications that are described under the heading “Description of Notes” in this prospectus supplement.
 
Use of proceeds We estimate that the net proceeds from the offering will be approximately $214.8 million. We intend to apply all of the net proceeds from the sale of the notes to borrowings under Whiting Oil and Gas Corporation’s revolving credit agreement. See “Use of Proceeds.”
 
Absence of a public market for the notes The notes are new securities and there is currently no established market for the notes. Accordingly, we cannot assure you as to the development or liquidity of any market for the notes. The underwriters have advised us that they currently intend to make a market in the notes. However, they are not obligated to do so, and they may discontinue any market making with respect to the notes without notice. We do not intend to apply for a listing of the notes on any securities exchange or for the inclusion of the notes on any automated dealer quotation system.
 
Risk factors See “Risk Factors” and the other information in this prospectus supplement and the accompanying prospectus for a discussion of factors you should carefully consider before deciding to invest in the notes.

S-9


Table of Contents

Summary Historical Financial Information
          The consolidated income statement information for the years ended December 31, 2004, 2003 and 2002 and the balance sheet information at December 31, 2004 and 2003 are derived from, and are qualified by reference to, our audited consolidated financial statements incorporated by reference into this prospectus supplement and the accompanying prospectus.
                             
    Year Ended December 31,
     
    2004   2003   2002
             
    (dollars in millions)
Consolidated Income Statement Information:
                       
Revenues:
                       
 
Oil and gas sales
  $ 281.1     $ 175.7     $ 122.7  
 
Loss on oil and gas hedging activities
    (4.9 )     (8.7 )     (3.2 )
 
Gain on sale of oil and gas properties
    1.0             1.0  
 
Gain on sale of marketable securities
    4.8              
 
Interest income and other
    0.1       0.3        
                   
   
Total revenues
  $ 282.1     $ 167.3     $ 120.5  
                   
Costs and expenses:
                       
 
Lease operating
  $ 54.2     $ 43.2     $ 32.9  
 
Production taxes
    16.8       10.7       7.4  
 
Depreciation, depletion and amortization
    54.0       41.2       43.6  
 
Exploration and impairment
    6.3       3.2       1.8  
 
Phantom equity plan(1)
          10.9        
 
General and administrative
    20.9       12.8       12.0  
 
Interest expense
    15.9       9.2       10.9  
                   
   
Total costs and expenses
  $ 168.1     $ 131.2     $ 108.6  
                   
Income before income taxes and cumulative change in accounting principle
  $ 114.0     $ 36.1     $ 11.9  
Income tax expense(2)
    44.0       13.9       4.2  
                   
Income before cumulative change in accounting principle
    70.0       22.2       7.7  
Cumulative change in accounting principle(3)
          3.9        
                   
Net income
  $ 70.0     $ 18.3     $ 7.7  
                   
Other Financial Information:
                       
Net cash provided by operating activities
  $ 135.5     $ 96.4     $ 62.6  
Capital expenditures(4)
  $ 532.3     $ 52.0     $ 165.4  
Ratio of earnings to fixed charges(5)
    7.92 x     4.85 x     2.08 x
EBITDA(6)
  $ 183.9     $ 82.6     $ 66.4  
                         
    As of December 31,
     
    2004   2003   2002
             
    (dollars in millions)
Balance Sheet Information:
                       
Total assets
  $ 1,092.2     $ 536.3     $ 448.5  
Long-term debt
  $ 325.3     $ 188.0     $ 265.5  
Stockholders’ equity
  $ 612.4     $ 259.6     $ 122.8  

S-10


Table of Contents

 
(1)  The completion of our initial public offering in November 2003 constituted a triggering event under our phantom equity plan, pursuant to which our employees received payments valued at $10.9 million in the form of shares of our common stock valued at approximately $6.5 million after withholding of shares for payroll and income taxes. As a result, in the fourth quarter of 2003, we recorded a one-time non-cash charge of $6.5 million and a one-time cash charge of $4.4 million, of which Alliant Energy Corporation, our former parent company, funded the substantial majority. The phantom equity plan is now terminated.
 
(2)  We generated Section 29 tax credits of $5.4 million in 2002. Section 29 tax credit provisions of the Internal Revenue Code expired as of December 31, 2002. In 2002, we were able to use our $5.4 million of Section 29 tax credits in the consolidated federal income tax return filed by Alliant Energy, but since these credits would not have been used in a stand-alone filing, they were recorded as additional paid-in capital as opposed to a reduction in income tax expense.
 
(3)  In 2003, we adopted Statement of Financial Accounting Standards No. 143, “Accounting for Asset Retirement Obligations.” The adoption of SFAS 143 included a one-time cumulative effect adjustment to net income.
 
(4)  In 2003, we acquired the limited partnership interests in three partnerships in which our wholly owned subsidiary is the general partner. Though disclosed as acquisitions of limited partnership interests in our consolidated statements of cash flows, these amounts are recorded as oil and natural gas properties on our consolidated balance sheets and are included in capital expenditures in this summary historical financial information.
 
(5)  For purposes of calculating the ratios of consolidated earnings to fixed charges, earnings consist of income before income taxes, fixed charges and amortization of capitalized interest, less capitalized interest. Fixed charges consist of interest expensed, interest capitalized, amortized premiums, discounts and capitalized expenses related to indebtedness and an estimate of interest within rental expense. The ratio of earnings to fixed charges for the years ended December 31, 2001 and 2000 were 6.10x and 6.93x, respectively.
 
(6)  We define EBITDA as earnings before interest, taxes, depreciation, depletion and amortization. EBITDA is not a measure of performance calculated in accordance with generally accepted accounting principles in the United States, or GAAP. Although not prescribed under GAAP, we believe the presentation of EBITDA is relevant and useful because it helps our investors to understand our operating performance and makes it easier to compare our results with other companies that have different financing and capital structures or tax rates. EBITDA should not be considered in isolation of, or as a substitute for, net income as an indicator of operating performance or cash flows from operating activities as a measure of liquidity. EBITDA, as we calculate it, may not be comparable to EBITDA measures reported by other companies. In addition, EBITDA does not represent funds available for discretionary use.
      The following table presents a reconciliation of our consolidated net income to our consolidated EBITDA for the periods presented:
                         
    Year Ended December 31,
     
    2004   2003   2002
             
    (dollars in millions)
Net income
  $ 70.0     $ 18.3     $ 7.7  
Income tax expense
    44.0       13.9       4.2  
Interest expense
    15.9       9.2       10.9  
Depreciation, depletion and amortization
    54.0       41.2       43.6  
                   
EBITDA
  $ 183.9     $ 82.6     $ 66.4  
                   

S-11


Table of Contents

Summary Historical Reserve and Operating Information
          The following tables present summary information regarding our estimated net proved oil and natural gas reserves as of December 31, 2004, 2003 and 2002 and our historical operating data for the years ended December 31, 2004, 2003 and 2002. All calculations of estimated net proved reserves have been made in accordance with the rules and regulations of the Securities and Exchange Commission and, except as otherwise indicated, give no effect to federal or state income taxes.
                             
    As of December 31,
     
    2004   2003   2002
             
Reserve Data:
                       
Total estimated net proved reserves:
                       
 
Natural gas (Bcf)
    339.9       231.0       236.0  
 
Oil (MMbbls)
    87.6       34.6       29.5  
   
Total (Bcfe)
    865.4       438.8       412.7  
Estimated net proved developed reserves:
                       
 
Natural gas (Bcf)
    242.6       171.9       167.6  
 
Oil (MMbbls)
    60.6       26.2       23.8  
   
Total (Bcfe)
    606.4       328.9       310.4  
Estimated future net revenues before income taxes (in millions)
  $ 3,424.8     $ 1,352.2     $ 1,112.4  
Present value of estimated future net revenues before income taxes (in millions)(1)(2)
  $ 1,851.6     $ 784.6     $ 638.6  
Standardized measure of discounted future net cash flows (in millions)(3)
  $ 1,312.1     $ 589.6     $ 476.0  
                             
    Year Ended December 31,
     
    2004   2003   2002
             
Operating Data:
                       
Net Production:
                       
 
Natural gas (Bcf)
    25.1       21.6       21.4  
 
Oil (MMbbls)
    3.7       2.6       2.3  
   
Total (Bcfe)
    47.0       37.2       35.2  
Net sales (in millions)(4):
                       
 
Natural gas
  $ 139.4     $ 104.4     $ 68.6  
 
Oil
  $ 141.7     $ 71.3     $ 54.1  
   
Total
  $ 281.1     $ 175.7     $ 122.7  
Average sales prices:
                       
 
Natural gas (per Mcf)
  $ 5.56     $ 4.78     $ 3.21  
 
Effect of natural gas hedges on average price (per Mcf)
  $     $ (0.30 )   $ (0.01 )
                   
 
Natural gas net of hedging (per Mcf)
  $ 5.56     $ 4.48     $ 3.20  
                   
 
Oil (per Bbl)
  $ 38.72     $ 27.50     $ 23.35  
 
Effect of oil hedges on average price (per Bbl)
  $ (1.33 )   $ (0.37 )   $ (1.27 )
                   
 
Oil net of hedging (per Bbl)
  $ 37.39     $ 27.13     $ 22.08  
                   
Average (per Mcfe):
                       
 
Lease operating expenses
  $ 1.15     $ 1.16     $ 0.93  
 
Production taxes
  $ 0.36     $ 0.29     $ 0.21  
 
Depreciation, depletion and amortization expenses
  $ 1.15     $ 1.11     $ 1.24  
 
General and administrative expenses, net of reimbursements
  $ 0.45     $ 0.34     $ 0.34  

S-12


Table of Contents

 
(1)  The present value of estimated future net revenues attributable to our reserves was prepared using constant prices, as of the calculation date, discounted at 10% per year on a pre-tax basis.
 
(2)  The December 31, 2004 amount was calculated using a period end average realized oil price of $40.58 per barrel and a period end average realized natural gas price of $5.56 per Mcf, the December 31, 2003 amount was calculated using a period end average realized oil price of $29.43 per barrel and a period end average realized natural gas price of $5.52 per Mcf, and the December 31, 2002 amount was calculated using a period end average realized oil price of $28.21 per barrel and a period end average realized natural gas price of $4.39 per Mcf.
 
(3)  The standardized measure of discounted future net cash flows represents the present value of future cash flows after income taxes discounted at 10%.
 
(4)  Before consideration of hedging transactions.

S-13


Table of Contents

RISK FACTORS
          You should carefully consider each of the risks described below, together with all of the other information contained in this prospectus supplement and the accompanying prospectus, before deciding to invest in the notes. If any of the following risks develop into actual events, our business, financial condition or results of operations could be materially adversely affected and you may lose all or part of your investment.
Risks Relating to the Notes
Our debt level and the covenants in the agreements governing our debt could negatively impact our financial condition, results of operations and business prospects and prevent us from fulfilling our obligations under the notes.
          As of March 31, 2005, after giving effect to this offering and the application of the net proceeds therefrom, we would have had approximately $372.8 million in outstanding consolidated indebtedness and $479.8 million of available borrowing capacity under Whiting Oil and Gas Corporation’s credit agreement. Following this offering, we will be permitted to incur additional indebtedness, provided we meet certain requirements in the indentures governing the notes and our outstanding 71/4% Senior Subordinated Notes due 2012 and Whiting Oil and Gas Corporation’s credit agreement.
          Our level of indebtedness, and the covenants contained in the agreements governing our debt, could have important consequences for our operations, including:
         • making it more difficult for us to satisfy our obligations under the notes or other debt and increasing the risk that we may default on our debt obligations;
 
         • requiring us to dedicate a substantial portion of our cash flow from operations to required payments on debt, thereby reducing the availability of cash flow for working capital, capital expenditures and other general business activities;
 
         • limiting our ability to obtain additional financing in the future for working capital, capital expenditures, acquisitions and general corporate and other activities;
 
         • limiting our flexibility in planning for, or reacting to, changes in our business and the industry in which we operate;
 
         • detracting from our ability to withstand successfully a downturn in our business or the economy generally;
 
         • placing us at a competitive disadvantage relative to other less leveraged competitors; and
 
         • making us vulnerable to increases in interest rates, because debt under Whiting Oil and Gas Corporation’s credit agreement may be at variable rates.
          We may be required to repay all or a portion of our debt on an accelerated basis in certain circumstances. If we fail to comply with the covenants and other restrictions in the agreements governing our debt, it could lead to an event of default and the acceleration of our repayment of outstanding debt. Our ability to comply with these covenants and other restrictions may be affected by events beyond our control, including prevailing economic and financial conditions. Moreover, the borrowing base limitation on Whiting Oil and Gas Corporation’s credit agreement is periodically redetermined based on an evaluation of our reserves. Upon a redetermination, if borrowings in excess of the revised borrowing capacity were outstanding, we could be forced to repay a portion of our bank debt.
          We may not have sufficient funds to make such repayments. If we are unable to repay our debt out of cash on hand, we could attempt to refinance such debt, sell assets or repay such debt with the proceeds from an equity offering. We cannot assure you that we will be able to generate sufficient cash flow to pay the interest on our debt or that future borrowings, equity financings or proceeds from the sale of assets will be available to pay or refinance such debt. The terms of our debt, including Whiting Oil and

S-14


Table of Contents

Gas Corporation’s credit agreement, may also prohibit us from taking such actions. Factors that will affect our ability to raise cash through an offering of our capital stock, a refinancing of our debt or a sale of assets include financial market conditions and our market value and operating performance at the time of such offering or other financing. We cannot assure you that any such offering, refinancing or sale of assets can be successfully completed.
The instruments governing our indebtedness contain various covenants limiting the discretion of our management in operating our business.
          The indentures governing the notes and our outstanding 71/4% Senior Subordinated Notes due 2012 and Whiting Oil and Gas Corporation’s credit agreement contain various restrictive covenants that limit our management’s discretion in operating our business. In particular, these agreements will limit our and our subsidiaries’ ability to, among other things:
         • pay dividends on, redeem or repurchase our capital stock or redeem or repurchase our subordinated debt;
 
         • make loans to others;
 
         • make investments;
 
         • incur additional indebtedness or issue preferred stock;
 
         • create certain liens;
 
         • sell assets;
 
         • enter into agreements that restrict dividends or other payments from our restricted subsidiaries to us;
 
         • consolidate, merge or transfer all or substantially all of the assets of us and our restricted subsidiaries taken as a whole;
 
         • engage in transactions with affiliates;
 
         • enter into hedging contracts;
 
         • create unrestricted subsidiaries; and
 
         • enter into sale and leaseback transactions.
          In addition, Whiting Oil and Gas Corporation’s credit agreement also requires us to maintain a certain working capital ratio and a certain debt to EBITDAX (as defined in the credit agreement) ratio.
          If we fail to comply with the restrictions in the indentures governing the notes and our outstanding 71/4% Senior Subordinated Notes due 2012 or Whiting Oil and Gas Corporation’s credit agreement or any other subsequent financing agreements, a default may allow the creditors, if the agreements so provide, to accelerate the related indebtedness as well as any other indebtedness to which a cross-acceleration or cross-default provision applies. In addition, lenders may be able to terminate any commitments they had made to make available further funds.
As a holding company, we rely on payments from our operating subsidiaries in order for us to make payments on the notes.
          Whiting Petroleum Corporation is a holding company with no significant operations of its own. Because our operations are conducted through our operating subsidiaries, we depend on dividends, advances and other payments from our subsidiaries in order to allow us to satisfy our financial obligations. Our subsidiaries are separate and distinct legal entities and have no obligation to pay any amounts to us, whether by dividends, advances or other payments. The ability of our subsidiaries to pay dividends and make other payments to us depends on their earnings, capital requirements and general financial conditions and is restricted by, among other things, Whiting Oil and Gas Corporation’s credit agreement, applicable

S-15


Table of Contents

corporate and other laws and regulations as well as agreements to which our subsidiaries may be a party. Specifically, Whiting Oil and Gas Corporation’s credit agreement allows it to make payments to us so that we may pay interest on the notes, but does not allow for payments from it to us to pay principal on the notes. Whiting Oil and Gas Corporation’s credit agreement also prohibits Whiting Oil and Gas Corporation from allowing us to make any principal payments on the notes. Although our subsidiary guarantors are guaranteeing the notes, each guarantee is subordinated to all senior debt of the relevant subsidiary guarantor.
We may not be able to repurchase the notes upon a change of control.
          Upon the occurrence of certain change of control events, holders of the notes may require us to repurchase all or any part of their notes. The occurrence of these same change of control events would also obligate us to offer to repurchase our outstanding 71/4% Senior Subordinated Notes due 2012. We may not have sufficient funds at the time of the change of control to make the required repurchases of the notes. Additionally, certain events that would constitute a “change of control” (as defined in the indenture) would constitute an event of default under Whiting Oil and Gas Corporation’s credit agreement that would, if it should occur, permit the lenders to accelerate the debt outstanding under such credit agreement and that, in turn, would cause an event of default under the indenture. We would not be permitted to repurchase the notes prior to termination of and payment in full of the obligations under Whiting Oil and Gas Corporation’s credit agreement.
          The source of funds for any repurchase required as a result of any change of control will be our available cash or cash generated from oil and gas operations or other sources, including borrowings, sales of assets, sales of equity or funds provided by a new controlling entity. We cannot assure you, however, that sufficient funds would be available at the time of any change of control to make any required repurchases of the notes and the 71/4% Senior Subordinated Notes due 2012 tendered and to repay debt under Whiting Oil and Gas Corporation’s credit agreement. Furthermore, using available cash to fund the potential consequences of a change of control may impair our ability to obtain additional financing in the future. Any future credit agreements or other agreements relating to debt to which we may become a party will most likely contain similar restrictions and provisions.
The notes and the subsidiary guarantees are subordinated to the senior debt of us and the subsidiary guarantors, respectively, and are effectively subordinated to our and the subsidiary guarantors’ secured debt.
          The notes will be our senior subordinated obligations. Accordingly, the notes will be subordinated to all of our existing and future senior debt, including our guarantee of borrowings under Whiting Oil and Gas Corporation’s credit agreement. We and our subsidiaries expect to incur additional senior debt from time to time in the future, whether under Whiting Oil and Gas Corporation’s credit agreement or otherwise. The indenture governing the notes will limit, but not prohibit, the incurrence of any other debt by us or our subsidiaries, including senior debt. As a result of such subordination, upon any distribution to our creditors in a liquidation, dissolution, bankruptcy, reorganization or any similar proceeding by or relating to us or our property, the holders of our senior debt would be entitled to receive payment in full before the holders of the notes would be entitled to receive any payment. In addition, all payments on the notes could be blocked in the event of a default on our senior debt. See “Description of Notes — Subordination.”
          The notes will not be secured. The borrowings under Whiting Oil and Gas Corporation’s credit agreement are secured by liens on Whiting Oil and Gas Corporation’s and Equity Oil Company’s assets, and the guarantees of those borrowings by Equity Oil Company and us are secured by liens on each guarantor’s assets. If we, Whiting Oil and Gas Corporation or any of our other subsidiary guarantors liquidates, dissolves or declares bankruptcy, or if payment under the credit agreement or any of our other secured debt is accelerated, our secured lenders would be entitled to exercise the remedies available to a secured lender under applicable law and will have a claim on those assets before the holders of the notes. As a result, the notes and the subsidiary guarantees are effectively subordinated to our and the subsidiary

S-16


Table of Contents

guarantors’ secured debt to the extent of the value of the assets securing that debt, and the holders of the notes would in all likelihood recover ratably less than the lenders of such secured debt in the event of our bankruptcy, liquidation or dissolution. As of March 31, 2005, after giving effect to this offering and the use of proceeds therefrom, we and the subsidiary guarantors would have had no secured debt outstanding to which the notes and the subsidiary guarantees would have been effectively subordinated, except for approximately $0.2 million of secured debt under Whiting Oil and Gas Corporation’s credit agreement. Approximately $479.8 million of secured debt would have been available for borrowing under the credit agreement.
          The notes will also be effectively subordinated to claims of creditors (other than us) of any of our subsidiaries that are not subsidiary guarantors of the notes, including lessors, trade creditors, taxing authorities, creditors holding guarantees and tort claimants. In the event of a liquidation, reorganization or similar proceeding relating to a subsidiary that is not a guarantor of the notes, these persons generally will have priority as to the assets of that subsidiary over our claims and equity interest and, thereby indirectly, holders of our debt, including the notes.
Your ability to transfer the notes may be limited by the absence of an active trading market, and there is no assurance that any active trading market will develop for the notes.
          The notes are a new issue of securities for which there is no established public market. We do not intend to have the notes listed on a national securities exchange or included on any automated dealer quotation system. The underwriters have advised us that they intend to make a market in the notes as permitted by applicable laws and regulations; however, the underwriters are not obligated to make a market in the notes, and they may discontinue their market-making activities at any time without notice. Therefore, we cannot assure you that an active market for the notes will develop or, if developed, that it will continue. Historically, the market for noninvestment grade debt has been subject to disruptions that have caused substantial volatility in the prices of securities similar to the notes. We cannot assure you that the market, if any, for the notes will be free from similar disruptions or that any such disruptions may not adversely affect the prices at which you may sell your notes. In addition, subsequent to their initial issuance, the notes may trade at a discount from their initial offering price, depending upon prevailing interest rates, the market for similar notes, our performance and other factors.
Any subsidiary guarantees of the notes may be further subordinated or avoided by a court.
          Certain of our subsidiaries will jointly and severally guarantee the notes on a senior subordinated basis. Various applicable fraudulent conveyance laws have been enacted for the protection of creditors. A court may use those laws to further subordinate or avoid any guarantee of the notes issued by any of our subsidiaries.
          A court could avoid or further subordinate the guarantee of the notes by any of our subsidiaries in favor of that subsidiary’s other debts or liabilities to the extent that the court determined either of the following were true at the time the subsidiary issued the guarantee:
         • that subsidiary incurred the guarantee with the intent to hinder, delay or defraud any of its present or future creditors or that such subsidiary contemplated insolvency with a design to favor one or more creditors to the total or partial exclusion of others; or
 
         • that subsidiary did not receive fair consideration or reasonably equivalent value for issuing the guarantee and, at the time it issued the guarantee, that subsidiary:
  was insolvent or rendered insolvent by reason of the issuance of the guarantee;
 
  was engaged or about to engage in a business or transaction for which the remaining assets of that subsidiary constituted unreasonably small capital; or
 
  intended to incur, or believed that it would incur, debts beyond its ability to pay such debts as they matured.

S-17


Table of Contents

          Among other things, a legal challenge of a subsidiary’s guarantee of the notes on fraudulent conveyance grounds may focus on the benefits, if any, realized by that subsidiary as a result of our issuance of the notes. To the extent a subsidiary’s guarantee of the notes is avoided as a result of fraudulent conveyance or held unenforceable for any other reason, the note holders would cease to have any claim in respect of that guarantee and would be creditors solely of ours.
Risks Relating to the Oil and Natural Gas Industry and Our Business
A substantial or extended decline in oil and natural gas prices may adversely affect our business, financial condition or results of operation.
          The price we receive for our oil and natural gas production heavily influences our revenue, profitability, access to capital and future rate of growth. Oil and natural gas are commodities and, therefore, their prices are subject to wide fluctuations in response to relatively minor changes in supply and demand. Historically, the markets for oil and natural gas have been volatile. These markets will likely continue to be volatile in the future. The prices we receive for our production, and the levels of our production, depend on numerous factors beyond our control. These factors include the following:
         • changes in global supply and demand for oil and natural gas;
 
         • the actions of the Organization of Petroleum Exporting Countries;
 
         • the price and quantity of imports of foreign oil and natural gas;
 
         • political conditions, including embargoes, in or affecting other oil-producing activity;
 
         • the level of global oil and natural gas exploration and production activity;
 
         • the level of global oil and natural gas inventories;
 
         • weather conditions;
 
         • technological advances affecting energy consumption; and
 
         • the price and availability of alternative fuels.
          Lower oil and natural gas prices may not only decrease our revenues on a per unit basis but also may reduce the amount of oil and natural gas that we can produce economically. A substantial or extended decline in oil or natural gas prices may materially and adversely affect our future business, financial condition, results of operations, liquidity or ability to finance planned capital expenditures. Lower oil and natural gas prices may also reduce the amount of our borrowing base under our credit agreement, which is determined in the discretion of the lenders based on the collateral value of our proved reserves that have been mortgaged to the lenders.
Drilling for and producing oil and natural gas are high risk activities with many uncertainties that could adversely affect our business, financial condition or results of operations.
          Our future success will depend on the success of our exploitation, exploration, development and production activities. Our oil and natural gas exploration and production activities are subject to numerous risks beyond our control, including the risk that drilling will not result in commercially viable oil or natural gas production. Our decisions to purchase, explore, develop or otherwise exploit prospects or properties will depend in part on the evaluation of data obtained through geophysical and geological analyses, production data and engineering studies, the results of which are often inconclusive or subject to varying interpretations. Please read “— Reserve estimates depend on many assumptions that may turn out to be inaccurate ...” for a discussion of the uncertainty involved in these processes. Our cost of drilling, completing and operating wells is often uncertain before drilling commences. Overruns in budgeted

S-18


Table of Contents

expenditures are common risks that can make a particular project uneconomical. Further, many factors may curtail, delay or cancel drilling, including the following:
         • delays imposed by or resulting from compliance with regulatory requirements;
 
         • pressure or irregularities in geological formations;
 
         • shortages of or delays in obtaining equipment and qualified personnel;
 
         • equipment failures or accidents;
 
         • adverse weather conditions, such as hurricanes and tropical storms;
 
         • reductions in oil and natural gas prices;
 
         • title problems; and
 
         • limitations in the market for oil and natural gas.
Our acquisition activities may not be successful.
          As part of our growth strategy, we have made and may continue to make acquisitions of businesses and properties. However, suitable acquisition candidates may not continue to be available on terms and conditions we find acceptable, and acquisitions pose substantial risks to our business, financial condition and results of operations. In pursuing acquisitions, we compete with other companies, many of which have greater financial and other resources to acquire attractive companies and properties. The following are some of the risks associated with acquisitions, including any future acquisitions and our recently completed acquisitions:
         • some of the acquired businesses or properties may not produce revenues, reserves, earnings or cash flow at anticipated levels;
 
         • we may assume liabilities that were not disclosed to us or that exceed our estimates;
 
         • we may be unable to integrate acquired businesses successfully and realize anticipated economic, operational and other benefits in a timely manner, which could result in substantial costs and delays or other operational, technical or financial problems;
 
         • acquisitions could disrupt our ongoing business, distract management, divert resources and make it difficult to maintain our current business standards, controls and procedures; and
 
         • we may incur additional debt related to future acquisitions.
Substantial acquisitions or other transactions could require significant external capital and could change our risk and property profile.
          In order to finance acquisitions of additional producing properties, we may need to alter or increase our capitalization substantially through the issuance of debt or equity securities, the sale of production payments or other means. These changes in capitalization may significantly affect our risk profile. Additionally, significant acquisitions or other transactions can change the character of our operations and business. The character of the new properties may be substantially different in operating or geological characteristics or geographic location than our existing properties. Furthermore, we may not be able to obtain external funding for future acquisitions or other transactions or to obtain external funding on terms acceptable to us.
Properties that we acquire may not produce as projected, and we may be unable to identify liabilities associated with the properties or obtain protection from sellers against them.
          Our business strategy includes a continuing acquisition program. During 2004, we completed seven separate acquisitions of producing properties with a combined purchase price of $535.1 million for estimated proved reserves as of the effective dates of the acquisitions of approximately 436.1 Bcfe,

S-19


Table of Contents

resulting in an aggregate cost of $1.23 per Mcfe of estimated proved reserves. The successful acquisition of producing properties requires assessments of many factors, which are inherently inexact and may be inaccurate, including the following:
         • the amount of recoverable reserves;
 
         • future oil and natural gas prices;
 
         • estimates of operating costs;
 
         • estimates of future development costs;
 
         • estimates of the costs and timing of plugging and abandonment; and
 
         • potential environmental and other liabilities.
          Our assessment will not reveal all existing or potential problems, nor will it permit us to become familiar enough with the properties to assess fully their capabilities and deficiencies. In the course of our due diligence, we may not inspect every well, platform or pipeline. Inspections may not reveal structural and environmental problems, such as pipeline corrosion or groundwater contamination, when they are made. We may not be able to obtain contractual indemnities from the seller for liabilities that it created. We may be required to assume the risk of the physical condition of the properties in addition to the risk that the properties may not perform in accordance with our expectations.
If oil and natural gas prices decrease, we may be required to take write-downs of the carrying values of our oil and natural gas properties.
          Accounting rules require that we review periodically the carrying value of our oil and natural gas properties for possible impairment. Based on specific market factors and circumstances at the time of prospective impairment reviews, and the continuing evaluation of development plans, production data, economics and other factors, we may be required to write down the carrying value of our oil and natural gas properties. A write-down constitutes a non-cash charge to earnings. We may incur impairment charges in the future, which could have a material adverse effect on our results of operations in the period taken.
Our development and exploration operations require substantial capital and we may be unable to obtain needed capital or financing on satisfactory terms, which could lead to a loss of properties and a decline in our natural gas and oil reserves.
          The oil and natural gas industry is capital intensive. We make and expect to continue to make substantial capital expenditures in our business and operations for the exploration for and development, production and acquisition of oil and natural gas reserves. To date, we have financed capital expenditures primarily with bank borrowings and cash generated by operations. We intend to finance our future capital expenditures with cash flow from operations and our existing financing arrangements. Our cash flow from operations and access to capital are subject to a number of variables, including:
         • our proved reserves;
 
         • the level of oil and natural gas we are able to produce from existing wells;
 
         • the prices at which oil and natural gas are sold; and
 
         • our ability to acquire, locate and produce new reserves.
          If our revenues or the borrowing base under our bank credit agreement decreases as a result of lower oil and natural gas prices, operating difficulties, declines in reserves or for any other reason, then we may have limited ability to obtain the capital necessary to sustain our operations at current levels. We may, from time to time, need to seek additional financing. There can be no assurance as to the availability or terms of any additional financing.

S-20


Table of Contents

          If additional capital is needed, then we may not be able to obtain debt or equity financing on terms favorable to us, or at all. If cash generated by operations or available under our revolving credit facility is not sufficient to meet our capital requirements, the failure to obtain additional financing could result in a curtailment of our operations relating to exploration and development of our prospects, which in turn could lead to a possible loss of properties and a decline in our natural gas and oil reserves.
Reserve estimates depend on many assumptions that may turn out to be inaccurate. Any material inaccuracies in these reserve estimates or underlying assumptions will materially affect the quantities and present value of our reserves.
          The process of estimating oil and natural gas reserves is complex. It requires interpretations of available technical data and many assumptions, including assumptions relating to economic factors. Any significant inaccuracies in these interpretations or assumptions could materially affect the estimated quantities and present value of reserves shown or incorporated by reference in this prospectus supplement or the accompanying prospectus.
          In order to prepare our estimates, we must project production rates and timing of development expenditures. We must also analyze available geological, geophysical, production and engineering data. The extent, quality and reliability of this data can vary. The process also requires economic assumptions about matters such as oil and natural gas prices, drilling and operating expenses, capital expenditures, taxes and availability of funds. Therefore, estimates of oil and natural gas reserves are inherently imprecise.
          Actual future production, oil and natural gas prices, revenues, taxes, development expenditures, operating expenses and quantities of recoverable oil and natural gas reserves most likely will vary from our estimates. Any significant variance could materially affect the estimated quantities and present value of reserves shown or incorporated by reference in this prospectus supplement or the accompanying prospectus. In addition, we may adjust estimates of proved reserves to reflect production history, results of exploration and development, prevailing oil and natural gas prices and other factors, many of which are beyond our control.
          You should not assume that the present value of future net revenues from our proved reserves referred to in this prospectus supplement is the current market value of our estimated oil and natural gas reserves. In accordance with SEC requirements, we generally base the estimated discounted future net cash flows from our proved reserves on prices and costs on the date of the estimate. Actual future prices and costs may differ materially from those used in the present value estimate. If natural gas prices decline by $0.10 per Mcf, then the pre-tax PV10% value of our proved reserves as of January 1, 2005 would decrease from $1,851.6 million to $1,829.3 million. If oil prices decline by $1.00 per barrel, then the pre-tax PV10% value of our proved reserves as of January 1, 2005 would decrease from $1,851.6 million to $1,809.0 million.
Seasonal weather conditions and lease stipulations adversely affect our ability to conduct drilling activities in some of the areas where we operate.
          Oil and natural gas operations in the Rocky Mountains are adversely affected by seasonal weather conditions and lease stipulations designed to protect various wildlife. In certain areas drilling and other oil and natural gas activities can only be conducted during the spring and summer months. This limits our ability to operate in those areas and can intensify competition during those months for drilling rigs, oil field equipment, services, supplies and qualified personnel, which may lead to periodic shortages. Resulting shortages or high costs could delay our operations and materially increase our operating and capital costs.
Prospects that we decide to drill may not yield oil or natural gas in commercially viable quantities.
          We describe some of our current prospects and our plans to explore those prospects in our Annual Report on Form 10-K for the year ended December 31, 2004, which is incorporated by reference in this prospectus supplement and the accompanying prospectus. A prospect is a property on which we have identified what our geoscientists believe, based on available seismic and geological information, to be

S-21


Table of Contents

indications of oil or natural gas. Our prospects are in various stages of evaluation, ranging from a prospect which is ready to drill to a prospect that will require substantial additional seismic data processing and interpretation. There is no way to predict in advance of drilling and testing whether any particular prospect will yield oil or natural gas in sufficient quantities to recover drilling or completion costs or to be economically viable. The use of seismic data and other technologies and the study of producing fields in the same area will not enable us to know conclusively prior to drilling whether oil or natural gas will be present or, if present, whether oil or natural gas will be present in commercial quantities. We cannot assure you that the analogies we draw from available data from other wells, more fully explored prospects or producing fields will be applicable to our drilling prospects.
We may incur substantial losses and be subject to substantial liability claims as a result of our oil and natural gas operations.
          We are not insured against all risks. Losses and liabilities arising from uninsured and underinsured events could materially and adversely affect our business, financial condition or results of operations. Our oil and natural gas exploration and production activities are subject to all of the operating risks associated with drilling for and producing oil and natural gas, including the possibility of:
         • environmental hazards, such as uncontrollable flows of oil, natural gas, brine, well fluids, toxic gas or other pollution into the environment, including groundwater and shoreline contamination;
 
         • abnormally pressured formations;
 
         • mechanical difficulties, such as stuck oil field drilling and service tools and casing collapse;
 
         • fires and explosions;
 
         • personal injuries and death; and
 
         • natural disasters.
          Any of these risks could adversely affect our ability to conduct operations or result in substantial losses to our company. We may elect not to obtain insurance if we believe that the cost of available insurance is excessive relative to the risks presented. In addition, pollution and environmental risks generally are not fully insurable. If a significant accident or other event occurs and is not fully covered by insurance, then it could adversely affect us.
We have limited control over activities on properties we do not operate, which could reduce our production and revenues.
          If we do not operate the properties in which we own an interest, we do not have control over normal operating procedures, expenditures or future development of underlying properties. The failure of an operator of our wells to adequately perform operations, or an operator’s breach of the applicable agreements, could reduce our production and revenues. The success and timing of our drilling and development activities on properties operated by others therefore depends upon a number of factors outside of our control, including the operator’s timing and amount of capital expenditures, expertise and financial resources, inclusion of other participants in drilling wells, and use of technology. Because we do not have a majority interest in most wells we do not operate, we may not be in a position to remove the operator in the event of poor performance.
Our use of 3-D seismic data is subject to interpretation and may not accurately identify the presence of natural gas and oil, which could adversely affect the results of our drilling operations.
          Even when properly used and interpreted, 3-D seismic data and visualization techniques are only tools used to assist geoscientists in identifying subsurface structures and hydrocarbon indicators and do not enable the interpreter to know whether hydrocarbons are, in fact, present in those structures. In addition, the use of 3-D seismic and other advanced technologies requires greater predrilling expenditures than

S-22


Table of Contents

traditional drilling strategies, and we could incur losses as a result of such expenditures. As a result, some of our drilling activities may not be successful or economical and our overall drilling success rate or our drilling success rate for activities in a particular area could decline. We often gather 3-D seismic over large areas. Our interpretation of seismic data delineates for us those portions of an area that we believe are desirable for drilling. Therefore, we may chose not to acquire option or lease rights prior to acquiring seismic data and, in many cases, we may identify hydrocarbon indicators before seeking option or lease rights in the location. If we are not able to lease those locations on acceptable terms, it would result in our having made substantial expenditures to acquire and analyze 3-D data without having an opportunity to attempt to benefit from those expenditures.
Market conditions or operational impediments may hinder our access to oil and natural gas markets or delay our production.
          Market conditions or the unavailability of satisfactory oil and natural gas transportation arrangements may hinder our access to oil and natural gas markets or delay our production. The availability of a ready market for our oil and natural gas production depends on a number of factors, including the demand for and supply of oil and natural gas and the proximity of reserves to pipelines and terminal facilities. Our ability to market our production depends in substantial part on the availability and capacity of gathering systems, pipelines and processing facilities owned and operated by third parties. Our failure to obtain such services on acceptable terms could materially harm our business. We may be required to shut in wells for a lack of a market or because of inadequacy or unavailability of natural gas pipeline or gathering system capacity. If that were to occur, then we would be unable to realize revenue from those wells until production arrangements were made to deliver to market.
We are subject to complex laws that can affect the cost, manner or feasibility of doing business.
          Exploration, development, production and sale of oil and natural gas are subject to extensive federal, state, local and international regulation. We may be required to make large expenditures to comply with governmental regulations. Matters subject to regulation include:
         • discharge permits for drilling operations;
  drilling bonds;
 
  reports concerning operations;
 
  the spacing of wells;
 
  unitization and pooling of properties; and
 
  taxation.
          Under these laws, we could be liable for personal injuries, property damage and other damages. Failure to comply with these laws also may result in the suspension or termination of our operations and subject us to administrative, civil and criminal penalties. Moreover, these laws could change in ways that substantially increase our costs. Any such liabilities, penalties, suspensions, terminations or regulatory changes could materially adversely affect our financial condition and results of operations.
Our operations may incur substantial liabilities to comply with the environmental laws and regulations.
          Our oil and natural gas operations are subject to stringent federal, state and local laws and regulations relating to the release or disposal of materials into the environment or otherwise relating to environmental protection. These laws and regulations may require the acquisition of a permit before drilling commences, restrict the types, quantities, and concentration of materials that can be released into the environment in connection with drilling and production activities, limit or prohibit drilling activities on certain lands lying within wilderness, wetlands, and other protected areas, and impose substantial liabilities for pollution resulting from our operations. Failure to comply with these laws and regulations may result in the assessment of administrative, civil, and criminal penalties, incurrence of investigatory or remedial

S-23


Table of Contents

obligations, or the imposition of injunctive relief. Changes in environmental laws and regulations occur frequently, and any changes that result in more stringent or costly material handling, storage, transport, disposal or cleanup requirements could require us to make significant expenditures to maintain compliance, and may otherwise have a material adverse effect on our results of operations, competitive position, or financial condition as well as those of the oil and natural gas industry in general. Under these environmental laws and regulations, we could be held strictly liable for the removal or remediation of previously released materials or property contamination regardless of whether we were responsible for the release or if our operations were standard in the industry at the time they were performed. Federal law and some state laws also allow the government to place a lien on real property for costs incurred by the government to address contamination on the property.
Unless we replace our oil and natural gas reserves, our reserves and production will decline, which would adversely affect our cash flows and income.
          Unless we conduct successful development, exploitation and exploration activities or acquire properties containing proved reserves, our proved reserves will decline as those reserves are produced. Producing oil and natural gas reservoirs generally are characterized by declining production rates that vary depending upon reservoir characteristics and other factors. Our future oil and natural gas reserves and production, and, therefore our cash flow and income, are highly dependent on our success in efficiently developing and exploiting our current reserves and economically finding or acquiring additional recoverable reserves. We may not be able to develop, exploit, find or acquire additional reserves to replace our current and future production.
The loss of senior management or technical personnel could adversely affect us.
          To a large extent, we depend on the services of our senior management and technical personnel. The loss of the services of our senior management or technical personnel, including James J. Volker, our Chairman, President and Chief Executive Officer, James T. Brown, our Vice President, Operations, J. Douglas Lang, our Vice President, Reservoir Engineering/ Acquisitions, David M. Seery, our Vice President of Land, Michael J. Stevens, our Vice President and Chief Financial Officer, or Mark R. Williams, our Vice President, Exploration and Development, could have a material adverse effect on our operations. We do not maintain, nor do we plan to obtain, any insurance against the loss of any of these individuals.
The unavailability or high cost of additional drilling rigs, equipment, supplies, personnel and oil field services could adversely affect our ability to execute on a timely basis our exploration and development plans within our budget.
          Shortages or the high cost of drilling rigs, equipment, supplies or personnel could delay or adversely affect our development and exploration operations, which could have a material adverse effect on our business, financial condition or results of operations.
Competition in the oil and natural gas industry is intense, which may adversely affect our ability to compete.
          We operate in a highly competitive environment for acquiring properties, marketing oil and natural gas and securing trained personnel. Many of our competitors possess and employ financial, technical and personnel resources substantially greater than ours, which can be particularly important in the areas in which we operate. Those companies may be able to pay more for productive oil and natural gas properties and exploratory prospects and to evaluate, bid for and purchase a greater number of properties and prospects than our financial or personnel resources permit. Our ability to acquire additional prospects and to find and develop reserves in the future will depend on our ability to evaluate and select suitable properties and to consummate transactions in a highly competitive environment. Also, there is substantial competition for capital available for investment in the oil and natural gas industry. We may not be able to

S-24


Table of Contents

compete successfully in the future in acquiring prospective reserves, developing reserves, marketing hydrocarbons, attracting and retaining quality personnel and raising additional capital.
Our use of oil and natural gas price hedging contracts involves credit risk and may limit future revenues from price increases and result in significant fluctuations in our net income.
          We enter into hedging transactions for our oil and natural gas production to reduce our exposure to fluctuations in the price of oil and natural gas. Our hedging transactions have to date consisted of financially settled crude oil and natural gas forward sales contracts with major financial institutions. We have contracts maturing in 2005 covering the sale of 6,000,000 MMbtu of natural gas and 1,094,000 barrels of oil and contracts maturing in 2006 covering the sale of 750,000 MMbtu of natural gas and 250,000 barrels of oil. Whiting Oil and Gas Corporation’s credit agreement requires us to hedge at least 60% of our total forecasted PDP production for the period from November 1, 2004 through December 31, 2005. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations — Quantitative and Qualitative Disclosure about Market Risk” in our Annual Report on Form 10-K for the year ended December 31, 2004, which is incorporated by reference into this prospectus supplement and the accompanying prospectus, for pricing and a more detailed discussion of our hedging transactions.
          We may in the future enter into these and other types of hedging arrangements to reduce our exposure to fluctuations in the market prices of oil and natural gas. Hedging transactions expose us to risk of financial loss in some circumstances, including if production is less than expected, the other party to the contract defaults on its obligations or there is a change in the expected differential between the underlying price in the hedging agreement and actual prices received. Hedging transactions may limit the benefit we would have otherwise received from increases in the price for oil and natural gas. Furthermore, if we do not engage in hedging transactions, then we may be more adversely affected by declines in oil and natural gas prices than our competitors who engage in hedging transactions. Additionally, hedging transactions may expose us to cash margin requirements.

S-25


Table of Contents

USE OF PROCEEDS
          We estimate that the net proceeds from this offering will be approximately $214.8 million after deducting the underwriting discount and commissions and estimated offering expenses payable by us. We intend to apply all of the net proceeds from the sale of the notes to repay debt currently outstanding under Whiting Oil and Gas Corporation’s credit agreement that we incurred in connection with the following recent acquisitions of oil and natural gas producing properties: our March 31, 2005 acquisition of interests in five fields in the Green River Basin of Wyoming for $65.0 million, our December 31, 2004 acquisitions of interests in the Would Have Field in Texas and in the Lake Como Field in Mississippi for a total of $19.0 million, our September 30, 2004 acquisition of interests in three fields in Wyoming and Utah for $35.0 million, and our September 23, 2004 acquisition of interests in 17 fields in the Permian Basin of West Texas and Southeast New Mexico for $345.0 million. Borrowings under the credit agreement currently bear interest at the rate of 3.73% and mature in September 2008.
CAPITALIZATION
          The following table sets forth our capitalization as of March 31, 2005, on an actual basis and as adjusted to give effect to this offering and the anticipated application of the estimated net proceeds of this offering.
                       
    March 31, 2005
     
    Actual   As Adjusted
         
    (dollars in thousands)
Cash and cash equivalents
  $ 16,337     $ 16,337  
             
Long-term debt:
               
 
Whiting Oil and Gas Corporation credit agreement
  $ 215,000     $ 240  
 
71/4% Senior Subordinated Notes due 2012(1)
    149,321       149,321  
 
   % Senior Subordinated Notes due 2013 offered hereby
          220,000  
 
Note payable to Alliant Energy Corporation
    3,205       3,205  
             
     
Total
    367,526       372,766  
 
Current portion of long-term debt
    (3,205 )     (3,205 )
             
     
Long-term debt
  $ 364,321     $ 369,561  
Stockholders’ equity:
               
 
Common stock: $0.001 par value, 75,000,000 shares authorized, 29,791,922 shares issued and outstanding
  $ 30     $ 30  
 
Preferred stock: $0.001 par value, 5,000,000 shares authorized, no shares issued or outstanding
           
Additional paid-in capital
    458,800       458,800  
Retained earnings
    185,516       185,516  
Deferred compensation
    (4,685 )     (4,685 )
Accumulated other comprehensive loss
    (16,965 )     (16,965 )
             
   
Total stockholders’ equity
  $ 622,696     $ 622,696  
             
     
Total capitalization
  $ 987,017     $ 992,257  
             
 
(1)  Represents $150.0 million of 71/4% Senior Subordinated Notes due 2012 issued May 11, 2004.

S-26


Table of Contents

DESCRIPTION OF NOTES
          You can find the definitions of certain terms used in this description under the subheading “— Certain Definitions.” In this description, the term “Company,” “us” or “we” refers only to Whiting Petroleum Corporation and not to any of its subsidiaries. The term “notes” refers to the Company’s notes being offered hereby.
          The Company will issue the notes under a subordinated indenture among itself, the Guarantors and J.P. Morgan Trust Company, National Association, as trustee, as supplemented by an indenture supplement creating the notes. We refer to the subordinated indenture, as so supplemented, as the “indenture.” The terms of the notes include those stated in the indenture and those made part of the indenture by reference to the Trust Indenture Act of 1939.
          The following description and the description in the accompanying prospectus are summaries of the material provisions of the notes and the indenture. These descriptions do not restate the indenture in its entirety. We urge you to read the indenture because it, and not these descriptions, define your rights as holders of the notes. We have filed copies of the subordinated indenture and the indenture supplement that make up the indenture as exhibits to the registration statement that includes the accompanying prospectus. Certain defined terms used in this description but not defined below under “— Certain Definitions” have the meanings assigned to them in the indenture.
          This “Description of Notes” replaces the description of the general provisions of the notes and the indenture in the accompanying prospectus to the extent that it is inconsistent with the accompanying prospectus. The notes are an issue of “Subordinated Debt Securities” as that term is used in the accompanying prospectus.
          The registered Holder of a note will be treated as the owner of it for all purposes. Only registered Holders will have rights under the indenture.
Brief Description of the Notes and the Subsidiary Guarantees
          The Notes. The notes:
         • are general unsecured obligations of the Company;
 
         • are subordinated in right of payment to all existing and future Senior Debt (as defined below) of the Company;
 
         • are pari passu in right of payment with the outstanding 2012 Notes and any future senior subordinated Indebtedness of the Company; and
 
         • are unconditionally guaranteed by the Guarantors on a senior subordinated basis.
          The Subsidiary Guarantees. Initially, the notes are guaranteed by the Company’s only operating subsidiaries, Whiting Oil and Gas Corporation, which we call “Whiting” in this description, and Equity Oil Company, as well as by one of the Company’s other existing subsidiaries.
          Each guarantee of the notes:
         • is a general unsecured obligation of the Guarantor;
 
         • is subordinated in right of payment to all existing and future Senior Debt of that Guarantor; and
 
         • is pari passu in right of payment with the guarantee of the 2012 Notes and any future senior subordinated Indebtedness of that Guarantor.

S-27


Table of Contents

          As of March 31, 2005, after giving effect to this offering and the application of the net proceeds thereof as set forth under “Use of Proceeds,” the Company (excluding its subsidiaries) would have had:
         • total Senior Debt of approximately $3.2 million (excluding its guarantee of Whiting Oil and Gas Corporation’s credit agreement), consisting of a note payable;
 
         • except for the $150.0 million aggregate principal amount of our outstanding 2012 Notes, no other senior subordinated Indebtedness; and
 
         • no Indebtedness contractually subordinated to the notes.
          On the same basis, the Guarantors would have had:
         • total Senior Debt of approximately $0.2 million consisting of borrowings under Whiting’s credit agreement;
 
         • except for their guarantees of the 2012 Notes, no other senior subordinated Indebtedness; and
 
         • no Indebtedness contractually subordinated to their guarantees of the notes.
          As indicated above and as discussed in detail below under the caption “— Subordination,” payments on the notes and under these guarantees will be subordinated to the payment of Senior Debt. The indenture will permit us and the Guarantors to incur additional Indebtedness, including additional Senior Debt.
          Initially, not all of our existing subsidiaries will guarantee the notes. Furthermore, under the circumstances described below under the subheading “— Certain Covenants — Additional Subsidiary Guarantees,” in the future one or more of our newly created or acquired subsidiaries may not guarantee the notes. In the event of a bankruptcy, liquidation or reorganization of any of these non-guarantor subsidiaries, the non-guarantor subsidiaries will pay the holders of their debt and their trade creditors before they will be able to distribute any of their assets to us. The non-guarantor subsidiaries have no outstanding Indebtedness (other than intercompany Indebtedness). They generated none of our consolidated revenues in the fiscal year ended December 31, 2004 and held less than 1% of our consolidated assets as of December 31, 2004.
          As of the date of the indenture, all of our subsidiaries will be “Restricted Subsidiaries.” However, under the circumstances described below under the subheading “— Certain Covenants — Designation of Restricted and Unrestricted Subsidiaries,” we will be permitted to designate certain of our subsidiaries as “Unrestricted Subsidiaries.” Our Unrestricted Subsidiaries will not be subject to many of the restrictive covenants in the indenture. Our Unrestricted Subsidiaries will not guarantee the notes.
Principal, Maturity and Interest
          The Company will issue notes with an initial maximum aggregate principal amount of $220 million. The Company may issue additional notes from time to time after this offering. Any offering of additional notes is subject to the covenant described below under the caption “— Certain Covenants — Incurrence of Indebtedness and Issuance of Preferred Stock.” The notes and any additional notes subsequently issued under the indenture will be treated as a single class for all purposes under the indenture, including, without limitation, waivers, amendments, redemptions and offers to purchase. The Company will issue notes in denominations of $1,000 and integral multiples of $1,000. The notes will mature on                     , 2013.
          Interest on the notes will accrue at the rate of      % per annum and will be payable semi-annually in arrears on  and                     , commencing on                     , 2005. The Company will make each interest payment to the Holders of record on the immediately preceding                     and                     .

S-28


Table of Contents

          Interest on the notes will accrue from the date of original issuance or, if interest has already been paid, from the date it was most recently paid. Interest will be computed on the basis of a 360-day year comprised of twelve 30-day months.
Methods of Receiving Payments on the Notes
          If a Holder has given wire transfer instructions to the Company, the Company will pay all principal, interest and premium, if any, on that Holder’s notes in accordance with those instructions. All other payments on notes will be made at the office or agency of the paying agent within the City and State of New York unless the Company elects to make interest payments by check mailed to the Holders at their address set forth in the register of Holders.
Paying Agent and Registrar for the Notes
          The trustee will initially act as paying agent and registrar. The Company may change the paying agent or registrar without prior notice to the Holders of the notes, and the Company or any Guarantor may act as paying agent.
Transfer and Exchange
          A Holder may transfer or exchange notes in accordance with the indenture. The Company or the trustee may require a Holder to furnish appropriate endorsements and transfer documents in connection with a transfer of notes. No service charge will be imposed for any registration of transfer or exchange of notes, but the Company may require Holders to pay all taxes due on transfer. The Company is not required to transfer or exchange any note selected for redemption. Also, the Company is not required to transfer or exchange any note for a period of 15 days before mailing a notice of partial redemption of the notes.
Subsidiary Guarantees
          Initially, our wholly-owned Subsidiaries Whiting, Equity Oil Company and Whiting Programs, Inc. will guarantee the notes. In the future, the notes will be guaranteed by each of the Company’s newly created or acquired Material Domestic Subsidiaries and by any other Restricted Subsidiary of the Company that guarantees its other Indebtedness. See “— Certain Covenants — Additional Subsidiary Guarantees.” These Subsidiary Guarantees will be joint and several obligations of the Guarantors. Each Subsidiary Guarantee will be subordinated to the prior payment in full of all Senior Debt of that Guarantor. The obligations of each Guarantor under its Subsidiary Guarantee will be limited as necessary to prevent that Subsidiary Guarantee from constituting a fraudulent conveyance under applicable law. See “Risk Factors — Risks Relating to the Notes — Any subsidiary guarantees of the notes may be further subordinated or avoided by a court.”
          A Guarantor may not sell or otherwise dispose of all or substantially all of its properties or assets to, or consolidate with or merge with or into (whether or not such Guarantor is the surviving Person), another Person, other than the Company or another Guarantor, unless:
            (1) immediately after giving effect to such transaction, no Default or Event of Default exists; and
 
            (2) either:
            (a) the Person acquiring the properties or assets in any such sale or other disposition or the Person formed by or surviving any such consolidation or merger (if other than the Guarantor) unconditionally assumes all the obligations of that Guarantor, pursuant to a supplemental indenture substantially in the form specified in the indenture, under the notes, the indenture and its Subsidiary Guarantee on terms set forth therein; or

S-29


Table of Contents

            (b) the Net Proceeds of such sale or other disposition are applied in accordance with the “Asset Sale” provisions of the indenture.
The Subsidiary Guarantee of a Guarantor will be released:
            (1)     in connection with any sale or other disposition of all or substantially all of the properties or assets of that Guarantor (including by way of merger or consolidation) to a Person that is not (either before or after giving effect to such transaction) a Subsidiary of the Company, if the sale or other disposition complies with the “Asset Sale” provisions of the indenture; or
 
            (2)     in connection with any sale or other disposition of all of the Capital Stock of that Guarantor to a Person that is not (either before or after giving effect to such transaction) a Subsidiary of the Company, if the sale or other disposition complies with the “Asset Sale” provisions of the indenture; or
 
            (3)     if the Company designates any Restricted Subsidiary that is a Guarantor as an Unrestricted Subsidiary in accordance with the applicable provisions of the indenture; or
 
            (4)     upon Legal Defeasance or Covenant Defeasance as described below under the caption “— Legal Defeasance and Covenant Defeasance” or upon satisfaction and discharge of the indenture as described below under the caption “— Satisfaction and Discharge.”
See “— Repurchase at the Option of Holders — Asset Sales.”
Subordination
          The payment of principal of, premium, if any, and interest on the notes will be subordinated in right of payment, as set forth in the indenture, to the prior payment in full in cash of all Obligations in respect of Senior Debt of the Company, whether outstanding on the date of the indenture or thereafter incurred.
          Upon any distribution to creditors of the Company:
            (1)     in a liquidation or dissolution of the Company;
 
            (2)     in a bankruptcy, reorganization, insolvency, receivership or similar proceeding relating to the Company or its property;
 
            (3)     in an assignment for the benefit of creditors; or
 
            (4)     in any marshaling of the Company’s assets and liabilities,
the holders of Senior Debt of the Company will be entitled to receive payment in full in cash of all Obligations due in respect of such Senior Debt (including interest after the commencement of any bankruptcy proceeding at the rate specified in the applicable Senior Debt, whether or not an allowable claim in any such proceeding) before the Holders of notes will be entitled to receive any payment with respect to the notes, and until all Obligations with respect to such Senior Debt are paid in full in cash, any distribution to which the Holders of notes would be entitled shall be made to the holders of such Senior Debt (except, in each case, that Holders of notes may receive and retain Permitted Junior Securities and payments made from a trust described under “— Legal Defeasance and Covenant Defeasance” or “— Satisfaction and Discharge”).
          The Company also may not make any payment with respect to the notes (other than Permitted Junior Securities or from a trust described under “— Legal Defeasance and Covenant Defeasance” or “— Satisfaction and Discharge”) if:
            (1)     a default in the payment of the principal of, premium, if any, or interest on, or any other Obligation in respect of, any Designated Senior Debt occurs and is continuing beyond any applicable grace period; or

S-30


Table of Contents

            (2)     any other default occurs and is continuing with respect to any Designated Senior Debt that permits holders of such Designated Senior Debt to accelerate its maturity (or that would permit such holders to accelerate with the giving of notice or the passage of time or both) and the trustee receives a notice of such default (a “Payment Blockage Notice”) from the Company or the holders of such Designated Senior Debt.
          Except as provided in the second preceding paragraph, payments on the notes may and will be resumed:
            (1)     in the case of a payment default, upon the date on which such default is cured or waived; and
 
            (2)     in the case of a nonpayment default, upon the earlier of the date on which such nonpayment default is cured or waived or 179 days after the date on which the applicable Payment Blockage Notice is received, unless the maturity of any Designated Senior Debt has been accelerated.
No new Payment Blockage Notice may be delivered unless and until 360 days have elapsed since the delivery of the immediately prior Payment Blockage Notice.
          No nonpayment default that existed or was continuing with respect to any Designated Senior Debt on the date of delivery of any Payment Blockage Notice to the trustee with respect to such Designated Senior Debt will be, or be made, the basis for a subsequent Payment Blockage Notice unless such default has been cured or waived for a period of not less than 90 days.
          In the event that the trustee or any Holder receives any payment of any Obligations with respect to the notes (other than Permitted Junior Securities or from a trust described under “— Legal Defeasance and Covenant Defeasance” or “— Satisfaction and Discharge”) at a time when such payment is prohibited by these subordination provisions, such payment shall be held by the trustee or such Holder, in trust for the benefit of, and will be paid over and delivered, as provided in the indenture, to the holders of Senior Debt or their proper representative.
          The indenture further requires the Company to promptly notify holders of Designated Senior Debt if payment of the notes is accelerated because of an Event of Default.
          The Subsidiary Guarantee of each Guarantor will be subordinated to the Senior Debt of such Guarantor generally to the same extent and in the same manner as the notes are subordinated to the Senior Debt of the Company.
          As a result of the subordination provisions described above, in the event of a bankruptcy, liquidation or reorganization or similar proceeding of the Company, Holders of notes may recover less ratably than creditors of the Company who are holders of its Senior Debt. See “Risk Factors — Risks Relating to the Notes — The notes and the subsidiary guarantees are subordinated to the senior debt of us and the subsidiary guarantors, respectively, and are effectively subordinated to our and the subsidiary guarantors’ secured debt.”
Optional Redemption
          At any time prior to                     , 2008, the Company may on any one or more occasions redeem up to 35% of the aggregate principal amount of notes issued under the indenture at a redemption price of      % of the principal amount, plus accrued and unpaid interest, if any, to the redemption date (subject to the right of Holders of record on the relevant record date to receive interest due on an interest payment date that is on or prior to the redemption date), with the net cash proceeds of one or more Equity Offerings by the Company, provided that:
            (1)     at least 65% of the aggregate principal amount of notes issued under the indenture remains outstanding immediately after the occurrence of such redemption (excluding notes held by the Company and its Subsidiaries); and

S-31


Table of Contents

            (2)     the redemption occurs within 120 days of the date of the closing of such Equity Offering.
          Except pursuant to the preceding paragraph, the notes will not be redeemable at the Company’s option prior to                     , 2009.
          On and after                     , 2009, the Company may redeem all or a part of the notes upon not less than 30 nor more than 60 days’ notice, at the redemption prices (expressed as percentages of principal amount) set forth below, plus accrued and unpaid interest, if any, on the notes redeemed to the applicable redemption date (subject to the right of Holders of record on the relevant record date to receive interest due on an interest payment date that is on or prior to the redemption date), if redeemed during the twelve-month period beginning on                     of the years indicated below:
         
Year   Percentage
     
2009
    %  
2010
    %  
2011 and thereafter
    100.0000%  
Selection and Notice
          If less than all of the notes are to be redeemed at any time, the trustee will select notes for redemption as follows:
            (1)     if the notes are listed on any national securities exchange, in compliance with the requirements of the principal national securities exchange on which the notes are listed; or
 
            (2)     if the notes are not listed on any national securities exchange, on a pro rata basis.
          No notes of $1,000 or less can be redeemed in part. Notices of redemption will be mailed by first class mail at least 30 but not more than 60 days before the redemption date to each Holder of notes to be redeemed at its registered address, except that redemption notices may be mailed more than 60 days prior to a redemption date if the notice is issued in connection with a defeasance of the notes or a satisfaction and discharge of the indenture. Notices of redemption may not be conditional.
          If any note is to be redeemed in part only, the notice of redemption that relates to that note will state the portion of the principal amount of that note that is to be redeemed. A new note in principal amount equal to the unredeemed portion of the original note will be issued in the name of the Holder of notes upon cancellation of the original note. Notes called for redemption become due on the date fixed for redemption. On and after the redemption date, interest ceases to accrue on notes or portions of them called for redemption.
Mandatory Redemption
          Except as set forth below under “— Repurchase at the Option of Holders,” the Company is not required to make mandatory redemption or sinking fund payments with respect to the notes or to repurchase the notes at the option of the Holders.
Repurchase at the Option of Holders
Change of Control
          If a Change of Control occurs, each Holder of notes will have the right to require the Company to repurchase all or any part (equal to $1,000 or an integral multiple of $1,000) of that Holder’s notes pursuant to a Change of Control Offer on the terms set forth in the indenture. In the Change of Control Offer, the Company will offer a Change of Control Payment in cash equal to 101% of the aggregate principal amount of notes repurchased plus accrued and unpaid interest, if any, on the notes repurchased, to the date of settlement (the “Change of Control Settlement Date”), subject to the right of Holders of record on the relevant record date to receive interest due on an interest payment date that is on or prior to

S-32


Table of Contents

the Change of Control Settlement Date. Within 30 days following any Change of Control, the Company will mail a notice to each Holder and the Trustee describing the transaction or transactions that constitute the Change of Control and offering to repurchase notes as of the Change of Control Purchase Date specified in the notice, which date will be no earlier than 30 days and no later than 60 days from the date such notice is mailed, pursuant to the procedures required by the indenture and described in such notice.
          The Company will comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with the repurchase of the notes as a result of a Change of Control. To the extent that the provisions of any securities laws or regulations conflict with the Change of Control provisions of the indenture, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under the Change of Control provisions of the indenture by virtue of such conflict.
          On the Change of Control Purchase Date, the Company will, to the extent lawful, accept for payment all notes or portions of notes properly tendered pursuant to the Change of Control Offer. Promptly thereafter on the Change of Control Settlement Date the Company will:
            (1)     deposit with the paying agent an amount equal to the Change of Control Payment in respect of all notes or portions of notes properly tendered; and
 
            (2)     deliver or cause to be delivered to the trustee the notes properly accepted together with an officers’ certificate stating the aggregate principal amount of notes or portions of notes being purchased by the Company.
          On the Change of Control Settlement Date, the paying agent will mail to each Holder of notes properly tendered the Change of Control Payment for such notes (or, if all the notes are then in global form, make such payment through the facilities of DTC), and the trustee will authenticate and mail (or cause to be transferred by book entry) to each Holder a new note equal in principal amount to any unpurchased portion of the notes surrendered, if any; provided that each new note will be in a principal amount of $1,000 or an integral multiple of $1,000. The Company will publicly announce the results of the Change of Control Offer on or as soon as practicable after the Change of Control Payment Date.
          Prior to complying with any of the provisions of this “Change of Control” covenant, but in any event no later than the Change of Control Purchase Date, the Company will either repay all outstanding Senior Debt or obtain the requisite consents, if any, under all agreements governing outstanding Senior Debt to permit the repurchase of notes required by this covenant.
          The provisions described above that require the Company to make a Change of Control Offer following a Change of Control will be applicable whether or not any other provisions of the indenture are applicable. Except as described above with respect to a Change of Control, the indenture does not contain provisions that permit the Holders of the notes to require that the Company repurchase or redeem the notes in the event of a takeover, recapitalization or similar transaction.
          The Company will not be required to make a Change of Control Offer upon a Change of Control if a third party makes the Change of Control Offer in the manner, at the time and otherwise in compliance with the requirements set forth in the indenture applicable to a Change of Control Offer made by the Company and purchases all notes properly tendered and not withdrawn under the Change of Control Offer.
          The definition of Change of Control includes a phrase relating to the direct or indirect sale, lease, transfer, conveyance or other disposition of “all or substantially all” of the properties or assets of the Company and its Restricted Subsidiaries taken as a whole. Although there is a limited body of case law interpreting the phrase “substantially all,” there is no precise established definition of the phrase under applicable law. Accordingly, the ability of a Holder of notes to require the Company to repurchase its notes as a result of a sale, lease, transfer, conveyance or other disposition of less than all of the assets of the Company and its Subsidiaries taken as a whole to another Person or group may be uncertain.

S-33


Table of Contents

Asset Sales
          The Company will not, and will not permit any of its Restricted Subsidiaries to, consummate an Asset Sale unless:
            (1)     the Company (or the Restricted Subsidiary, as the case may be) receives consideration at the time of the Asset Sale at least equal to the fair market value of the assets or Equity Interests issued or sold or otherwise disposed of;
 
            (2)     the fair market value is determined by the Company’s Board of Directors and evidenced by a resolution of the Board of Directors set forth in an officers’ certificate delivered to the trustee; and
 
            (3)     at least 75% of the consideration received in the Asset Sale by the Company or such Restricted Subsidiary is in the form of cash. For purposes of this provision, each of the following will be deemed to be cash:
            (a)     any liabilities, as shown on the Company’s or such Restricted Subsidiary’s most recent balance sheet, of the Company or any Subsidiary (other than contingent liabilities and liabilities that are by their terms subordinated to the notes or any Subsidiary Guarantee) that are assumed by the transferee of any such assets pursuant to a customary novation agreement that releases the Company or such Subsidiary from further liability; and
 
            (b)     any securities, notes or other obligations received by the Company or any such Restricted Subsidiary from such transferee that are contemporaneously, subject to ordinary settlement periods, converted by the Company or such Subsidiary into cash, to the extent of the cash received in that conversion.
          Within 360 days after the receipt of any Net Proceeds from an Asset Sale, the Company or any such Restricted Subsidiary may apply those Net Proceeds at its option to any combination of the following:
            (I)     to repay Senior Debt and, if the Senior Debt repaid is revolving credit Indebtedness, to correspondingly reduce commitments with respect thereto;
 
            (II)     to acquire all or substantially all of the properties or assets of one or more other Persons primarily engaged in the Oil and Gas Business, and, for this purpose, a division or line of business of a Person shall be treated as a separate Person;
 
            (III)     to acquire a majority of the Voting Stock of one or more other Persons primarily engaged in the Oil and Gas Business;
 
            (IV)     to make one or more capital expenditures; or
 
            (V)     to acquire other long-term assets that are used or useful in the Oil and Gas Business.
          Pending the final application of any Net Proceeds, the Company or any such Restricted Subsidiary may temporarily reduce revolving credit borrowings or otherwise invest the Net Proceeds in any manner that is not prohibited by the indenture. Any Net Proceeds from Asset Sales that are not applied or invested as provided in the preceding paragraph will constitute “Excess Proceeds.”
          On the 361st day after the Asset Sale (or, at the Company’s option, any earlier date), if the aggregate amount of Excess Proceeds then exceeds $20.0 million, the Company will make an Asset Sale Offer to all Holders of notes, and all holders of other Indebtedness that is pari passu with the notes containing provisions similar to those set forth in the indenture with respect to offers to purchase or redeem with the proceeds of sales of assets, to purchase the maximum principal amount of notes and such other pari passu Indebtedness that may be purchased out of the Excess Proceeds. The offer price in any Asset Sale Offer will be equal to 100% of principal amount plus accrued and unpaid interest, if any, to the date of settlement, subject to the right of Holders of record on the relevant record date to receive interest

S-34


Table of Contents

due on an interest payment date that is on or prior to the date of settlement, and will be payable in cash. If any Excess Proceeds remain after consummation of an Asset Sale Offer, the Company may use those Excess Proceeds for any purpose not otherwise prohibited by the indenture. If the aggregate principal amount of notes and other pari passu Indebtedness tendered into such Asset Sale Offer exceeds the amount of Excess Proceeds, the trustee will select the notes and such other pari passu Indebtedness to be purchased on a pro rata basis. Upon completion of each Asset Sale Offer, the amount of Excess Proceeds will be reset at zero.
          The Company will comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent those laws and regulations are applicable in connection with each repurchase of notes pursuant to an Asset Sale Offer. To the extent that the provisions of any securities laws or regulations conflict with the Asset Sale provisions of the indenture, the Company will comply with the applicable securities laws and regulations and will not be deemed to have breached its obligations under the Asset Sale provisions of the indenture by virtue of such conflict.
          The Company’s Credit Agreement will prohibit the Company from purchasing any notes, and also provides that certain change of control or asset sale events with respect to the Company would constitute a default or require repayment of the Senior Debt. Any future credit agreements or other agreements relating to Senior Debt to which the Company becomes a party may contain similar restrictions and provisions. In the event a Change of Control or Asset Sale occurs at a time when the Company is prohibited from purchasing notes, the Company could seek the consent of its senior lenders to the purchase of notes or could attempt to refinance the borrowings that contain such prohibition. If the Company does not obtain such a consent or repay such borrowings, the Company will remain prohibited from purchasing notes. In such case, the Company’s failure to purchase tendered notes would constitute an Event of Default under the indenture which would, in turn, constitute a default under such Senior Debt. In such circumstances, the subordination provisions in the indenture would likely restrict payments to the Holders of notes.
Certain Covenants
Restricted Payments
          The Company will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly:
            (1)     declare or pay any dividend or make any other payment or distribution on account of the Company’s or any of its Restricted Subsidiaries’ Equity Interests (including, without limitation, any payment in connection with any merger or consolidation involving the Company or any of its Restricted Subsidiaries) or to the direct or indirect holders of the Company’s or any of its Restricted Subsidiaries’ Equity Interests in their capacity as such (other than dividends or distributions payable in Equity Interests (other than Disqualified Stock) of the Company or payable to the Company or a Restricted Subsidiary of the Company);
 
            (2)     purchase, redeem or otherwise acquire or retire for value (including, without limitation, in connection with any merger or consolidation involving the Company) any Equity Interests of the Company or any direct or indirect parent of the Company;
 
            (3)     make any payment on or with respect to, or purchase, redeem, defease or otherwise acquire or retire for value any Indebtedness that is subordinated to the notes or the Subsidiary Guarantees, except a payment of interest or principal at the Stated Maturity thereof; or
 
            (4)     make any Restricted Investment (all such payments and other actions set forth in these clauses (1) through (4) above being collectively referred to as “Restricted Payments”),
unless, at the time of and after giving effect to such Restricted Payment:
            (1)     no Default or Event of Default has occurred and is continuing or would occur as a consequence of such Restricted Payment;

S-35


Table of Contents

            (2)     the Company would, at the time of such Restricted Payment and after giving pro forma effect thereto as if such Restricted Payment had been made at the beginning of the applicable four-quarter period, have been permitted to incur at least $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth in the first paragraph of the covenant described below under the caption “— Incurrence of Indebtedness and Issuance of Preferred Stock;” and
 
            (3)     such Restricted Payment, together with the aggregate amount of all other Restricted Payments made by the Company and its Restricted Subsidiaries after the date of the indenture for the 2012 Notes, May 11, 2004 (excluding Restricted Payments permitted by clauses (2), (3), (4), (6) and (7) of the next succeeding paragraph), is less than the sum, without duplication, of:
            (a)     50% of the Consolidated Net Income of the Company for the period (taken as one accounting period) from April 1, 2004 to the end of the Company’s most recently ended fiscal quarter for which internal financial statements are available at the time of such Restricted Payment (or, if such Consolidated Net Income for such period is a deficit, less 100% of such deficit), plus
 
            (b)     100% of the aggregate net cash proceeds received by the Company (including the fair market value of any Additional Assets to the extent acquired in consideration of Equity Interests of the Company (other than Disqualified Stock)) since May 11, 2004 as a contribution to its common equity capital or from the issue or sale of Equity Interests of the Company (other than Disqualified Stock) or from the issue or sale of convertible or exchangeable Disqualified Stock or convertible or exchangeable debt securities of the Company that have been converted into or exchanged for such Equity Interests (other than Equity Interests (or Disqualified Stock or debt securities) sold to a Subsidiary of the Company), plus
 
            (c)     to the extent that any Restricted Investment that was made after the date of the indenture for the 2012 Notes is sold for cash or otherwise liquidated or repaid for cash, the lesser of (i) the cash return of capital with respect to such Restricted Investment (less the cost of disposition, if any) and (ii) the initial amount of such Restricted Investment, plus
 
            (d)     to the extent that any Unrestricted Subsidiary of the Company is redesignated as a Restricted Subsidiary after the date of the indenture for the 2012 Notes, the lesser of (i) the fair market value of the Company’s Investment in such Subsidiary as of the date of such redesignation or (ii) such fair market value as of the date on which such Subsidiary was originally designated as an Unrestricted Subsidiary.
          So long as no Default or Event of Default has occurred and is continuing or would be caused thereby, the preceding provisions will not prohibit:
            (1)     the payment of any dividend within 60 days after the date of declaration of the dividend, if at the date of declaration the dividend payment would have complied with the provisions of the indenture;
 
            (2)     the redemption, repurchase, retirement, defeasance or other acquisition of any subordinated Indebtedness of the Company or any Guarantor or of any Equity Interests of the Company in exchange for, or out of the net cash proceeds of the substantially concurrent sale (other than to a Subsidiary of the Company) of, Equity Interests of the Company (other than Disqualified Stock); provided that the amount of any such net cash proceeds that are utilized for any such redemption, repurchase, retirement, defeasance or other acquisition will be excluded from clause (3)(b) of the preceding paragraph;

S-36


Table of Contents

            (3)     the defeasance, redemption, repurchase, retirement or other acquisition of subordinated Indebtedness of the Company or any Guarantor with the net cash proceeds from an incurrence of, or in exchange for, Permitted Refinancing Indebtedness;
 
            (4)     the payment of any dividend by a Restricted Subsidiary of the Company to the holders of its Equity Interests on a pro rata basis;
 
            (5)     the repurchase, redemption or other acquisition or retirement for value of any Equity Interests of the Company or any Restricted Subsidiary of the Company held by any current or former director or employee of the Company or any of its Restricted Subsidiaries pursuant to any director or employee equity subscription agreement or plan, stock option agreement or similar agreement or plan; provided that the aggregate price paid for all such repurchased, redeemed, acquired or retired Equity Interests may not exceed $1.0 million in any twelve-month period;
 
            (6)     the acquisition of Equity Interests by the Company in connection with the exercise of stock options or stock appreciation rights by way of cashless exercise;
 
            (7)     the payment of cash in lieu of fractional shares of Capital Stock in connection with any transaction otherwise permitted under this covenant; or
 
            (8)     other Restricted Payments in an aggregate amount since the date of the indenture for the 2012 Notes not to exceed $10.0 million.
          The amount of all Restricted Payments (other than cash) will be the fair market value on the date of the Restricted Payment of the asset(s) or securities proposed to be transferred or issued by the Company or such Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair market value of any assets or securities that are required to be valued by this covenant will be determined by the Board of Directors, whose determination shall be evidenced by a Board Resolution. The Board of Directors’ determination must be based upon an opinion or appraisal issued by an accounting, appraisal or investment banking firm of national standing if the fair market value exceeds $10.0 million. Not later than the date of making any Restricted Payment (excluding any Restricted Payment described in the preceding clause (2), (3), (4), (6) or (7)) the Company will deliver to the trustee an officers’ certificate stating that such Restricted Payment is permitted and setting forth the basis upon which the calculations required by this “Restricted Payments” covenant were computed, together with a copy of any fairness opinion or appraisal required by the indenture. For purposes of determining compliance with this “Restricted Payments” covenant, in the event that a Restricted Payment meets the criteria of more than one of the categories of Restricted Payments described in the preceding clauses (1) – (8), the Company will be permitted to classify (or later classify or reclassify in whole or in part in its sole discretion) such Restricted Payment in any manner that complies with this covenant.
Incurrence of Indebtedness and Issuance of Preferred Stock
          The Company will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee or otherwise become directly or indirectly liable, contingently or otherwise, with respect to (collectively, “incur”) any Indebtedness (including Acquired Debt), neither the Company nor any Guarantor will issue any Disqualified Stock, and the Company will not permit any of its other Restricted Subsidiaries to issue any shares of preferred stock; provided, however, that the Company and any Guarantor may incur Indebtedness (including Acquired Debt) or issue Disqualified Stock, if the Fixed Charge Coverage Ratio for the Company’s most recently ended four full fiscal quarters for which internal financial statements are available immediately preceding the date on which such additional Indebtedness is incurred or such Disqualified Stock is issued would have been at least 2.0 to 1.0, determined on a pro forma basis (including a pro forma application of the net proceeds therefrom), as if the additional Indebtedness had been incurred or Disqualified Stock had been issued, as the case may be, at the beginning of such four-quarter period.

S-37


Table of Contents

          The first paragraph of this covenant will not prohibit the incurrence of any of the following items of Indebtedness (collectively, “Permitted Debt”):
            (1)     the incurrence by the Company or any of its Restricted Subsidiaries of additional Indebtedness (including letters of credit) under one or more Credit Facilities in an aggregate principal amount at any one time outstanding under this clause (1) (with letters of credit being deemed to have a principal amount equal to the maximum potential liability of the Company and its Subsidiaries thereunder) not to exceed an amount equal to the greater of (a) $210.0 million and (b) 15% of ACNTA as of the date of such incurrence;
 
            (2)     the incurrence by the Company or any of its Restricted Subsidiaries of the Existing Indebtedness;
 
            (3)     the incurrence by the Company and the Guarantors of Indebtedness represented by the notes issued and sold in this offering and the related Subsidiary Guarantees to be issued on the date of the indenture;
 
            (4)     the incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness represented by Capital Lease Obligations, mortgage financings or purchase money obligations, in each case, incurred for the purpose of financing all or any part of the purchase price or cost of construction or improvement of property, plant or equipment used in the business of the Company or such Restricted Subsidiary, in an aggregate principal amount, including all Permitted Refinancing Indebtedness incurred to refund, refinance or replace any Indebtedness incurred pursuant to this clause (4), not to exceed $10.0 million at any time outstanding;
 
            (5)     the incurrence by the Company or any of its Restricted Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the net proceeds of which are used to refund, refinance or replace Indebtedness (other than intercompany Indebtedness) that was permitted by the indenture to be incurred under the first paragraph of this covenant or clause (2) or (3) of this paragraph or this clause (5);
 
            (6)     the incurrence by the Company or any of its Restricted Subsidiaries of intercompany Indebtedness between or among the Company and any of its Restricted Subsidiaries; provided, however, that:
            (a)     if the Company is the obligor on such Indebtedness and a Guarantor is not the obligee, such Indebtedness must be expressly subordinated to the prior payment in full in cash of all Obligations with respect to the notes, or if a Guarantor is the obligor on such Indebtedness and neither the Company nor another Guarantor is the obligee, such Indebtedness must be expressly subordinated to the prior payment in full in cash of all Obligations with respect to the Subsidiary Guarantee of such Guarantor; and
 
            (b)     (i) any subsequent issuance or transfer of Equity Interests that results in any such Indebtedness being held by a Person other than the Company or a Restricted Subsidiary of the Company and (ii) any sale or other transfer of any such Indebtedness to a Person that is neither the Company nor a Restricted Subsidiary of the Company will be deemed, in each case, to constitute an incurrence of such Indebtedness by the Company or such Restricted Subsidiary, as the case may be, that was not permitted by this clause (6);
            (7)     the incurrence by the Company or any of its Restricted Subsidiaries of Hedging Obligations;
 
            (8)     the guarantee by the Company or any of the Guarantors of Indebtedness of the Company or any Guarantor that was permitted to be incurred by another provision of this covenant;

S-38


Table of Contents

            (9)     the incurrence by the Company or any of its Restricted Subsidiaries of obligations relating to net gas balancing positions arising in the ordinary course of business and consistent with past practice;
 
            (10)     the incurrence by the Company’s Unrestricted Subsidiaries of Non-Recourse Debt; provided, however, that if any such Indebtedness ceases to be Non-Recourse Debt of an Unrestricted Subsidiary, such event will be deemed to constitute an incurrence of Indebtedness by a Restricted Subsidiary of the Company that was not permitted by this clause (10);
 
            (11)     the incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness in respect of bid, performance, surety and similar bonds issued for the account of the Company and any of its Restricted Subsidiaries in the ordinary course of business, including guarantees and obligations of the Company and any of its Restricted Subsidiaries with respect to letters of credit supporting such obligations (in each other than an obligation for money borrowed);
 
            (12)     the incurrence by the Company or any of its Restricted Subsidiaries of Indebtedness arising from agreements of the Company or any of its Restricted Subsidiaries providing for indemnification, adjustment of purchase price or similar obligations, in each case, incurred or assumed in connection with the disposition of any business, assets or Capital Stock of a Subsidiary, provided that the maximum aggregate liability in respect of all such Indebtedness shall at no time exceed the gross proceeds actually received by the Company and its Restricted Subsidiaries in connection with such disposition; and
 
            (13)     the incurrence by the Company or any of its Restricted Subsidiaries of additional Indebtedness in an aggregate principal amount (or accreted value, as applicable) at any time outstanding, not to exceed $25.0 million.
          For purposes of determining compliance with this “Incurrence of Indebtedness and Issuance of Preferred Stock” covenant, in the event that an item of Indebtedness (including Acquired Debt) meets the criteria of more than one of the categories of Permitted Debt described in clauses (1) through (13) above, or is entitled to be incurred pursuant to the first paragraph of this covenant, the Company will be permitted to classify (or later classify or reclassify in whole or in part in its sole discretion) such item of Indebtedness in any manner that complies with this covenant. Any indebtedness under Credit Facilities on the date of the indenture shall be considered incurred under the first paragraph of this covenant.
          The accrual of interest, the accretion or amortization of original issue discount, the payment of interest on any Indebtedness in the form of additional Indebtedness with the same terms, and the payment of dividends on Disqualified Stock in the form of additional shares of the same class of Disqualified Stock will not be deemed to be an incurrence of Indebtedness or an issuance of Disqualified Stock for purposes of this covenant; provided, in each such case, that the amount thereof is included in Fixed Charges of the Company as accrued.
No Senior Subordinated Debt
          The Company will not incur, create, issue, assume, guarantee or otherwise become liable for any Indebtedness that is subordinate or junior in right of payment to any Senior Debt of the Company and senior in any respect in right of payment to the notes. No Guarantor will incur, create, issue, assume, guarantee or otherwise become liable for any Indebtedness that is subordinate or junior in right of payment to the Senior Debt of such Guarantor and senior in any respect in right of payment to such Guarantor’s Subsidiary Guarantee.
Liens
          The Company will not and will not permit any of its Restricted Subsidiaries to, create, incur, assume or otherwise cause or suffer to exist or become effective any Lien of any kind (other than Permitted Liens) securing Indebtedness or Attributable Debt upon any of their property or assets, now

S-39


Table of Contents

owned or hereafter acquired, unless the notes or any Subsidiary Guarantee of such Restricted Subsidiary, as applicable, is secured on an equal and ratable basis (or on a senior basis to, in the case of obligations subordinated in right of payment to the notes or such Subsidiary Guarantee, as the case may be) with the obligations so secured until such time as such obligations are no longer secured by a Lien.
Dividend and Other Payment Restrictions Affecting Subsidiaries
          The Company will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly, create or permit to exist or become effective any consensual encumbrance or restriction on the ability of any Restricted Subsidiary to:
            (1) pay dividends or make any other distributions on its Capital Stock to the Company or any of its Restricted Subsidiaries, or pay any Indebtedness or other obligations owed to the Company or any of its Restricted Subsidiaries;
 
            (2) make loans or advances to the Company or any of its Restricted Subsidiaries; or
 
            (3) transfer any of its properties or assets to the Company or any of its Restricted Subsidiaries.
However, the preceding restrictions will not apply to encumbrances or restrictions existing under or by reason of:
            (1) agreements governing Existing Indebtedness and Credit Facilities as in effect on the date of the indenture and any amendments, modifications, restatements, renewals, increases, supplements, refundings, replacements or refinancings of those agreements, provided that the amendments, modifications, restatements, renewals, increases, supplements, refundings, replacement or refinancings are not materially more restrictive, taken as a whole, with respect to such dividend and other payment restrictions than those contained in those agreements on the date of the indenture;
 
            (2) the indenture, the notes and the Subsidiary Guarantees;
 
            (3) applicable law;
 
            (4) any instrument governing Indebtedness or Capital Stock of a Person acquired by the Company or any of its Restricted Subsidiaries as in effect at the time of such acquisition, which encumbrance or restriction is not applicable to any Person, or the properties or assets of any Person, other than the Person, or the property or assets of the Person, so acquired, provided that, in the case of Indebtedness, such Indebtedness was permitted by the terms of the indenture to be incurred;
 
            (5) customary non-assignment provisions in leases entered into in the ordinary course of business and consistent with past practices;
 
            (6) purchase money obligations for property acquired in the ordinary course of business that impose restrictions on that property of the nature described in clause (3) of the preceding paragraph;
 
            (7) any agreement for the sale or other disposition of a Restricted Subsidiary of the Company that restricts distributions by that Restricted Subsidiary pending its sale or other disposition;
 
            (8) Permitted Refinancing Indebtedness, provided that the restrictions contained in the agreements governing such Permitted Refinancing Indebtedness are not materially more restrictive, taken as a whole, than those contained in the agreements governing the Indebtedness being refinanced;

S-40


Table of Contents

            (9) Liens securing Indebtedness otherwise permitted to be incurred under the provisions of the covenant described above under the caption “— Liens” that limit the right of the debtor to dispose of the assets subject to such Liens;
 
            (10) provisions with respect to the disposition or distribution of assets or property in joint venture agreements, asset sale agreements, stock sale agreements, agreements respecting Permitted Business Investments and other similar agreements entered into in the ordinary course of business; and
 
            (11) restrictions on cash or other deposits or net worth imposed by customers under contracts entered into in the ordinary course of business.
Merger, Consolidation or Sale of Assets
          The Company may not, directly or indirectly: (1) consolidate or merge with or into another Person (whether or not the Company is the surviving corporation); or (2) sell, assign, transfer, lease, convey or otherwise dispose of all or substantially all of the properties or assets of the Company and its Restricted Subsidiaries taken as a whole, in one or more related transactions, to another Person, unless:
            (1) either: (a) the Company is the surviving corporation; or (b) the Person formed by or surviving any such consolidation or merger (if other than the Company) or to which such sale, assignment, transfer, lease, conveyance or other disposition has been made is a corporation organized or existing under the laws of the United States, any state of the United States or the District of Columbia;
 
            (2) the Person formed by or surviving any such consolidation or merger (if other than the Company) or the Person to which such sale, assignment, transfer, lease, conveyance or other disposition has been made assumes all the obligations of the Company under the notes and the indenture pursuant to agreements reasonably satisfactory to the trustee;
 
            (3) immediately after such transaction no Default or Event of Default exists;
 
            (4) the Company or the Person formed by or surviving any such consolidation or merger (if other than the Company), or to which such sale, assignment, transfer, lease, conveyance or other disposition has been made will, on the date of such transaction after giving pro forma effect thereto and any related financing transactions as if the same had occurred at the beginning of the applicable four-quarter period, be permitted to incur at least $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth in the first paragraph of the covenant described above under the caption “— Incurrence of Indebtedness and Issuance of Preferred Stock;” and
 
            (5) the Company shall have delivered to the trustee an officers’ certificate and an opinion of counsel, each stating that such consolidation, merger or disposition and such supplemental indenture (if any) comply with the indenture.
          Although there is a limited body of case law interpreting the phrase “substantially all,” there is no precise established definition of the phrase under applicable law. Accordingly, in certain circumstances there may be a degree of uncertainty as to whether a particular transaction would involve “all or substantially all” of the properties or assets of a Person.
Transactions with Affiliates
          The Company will not, and will not permit any of its Restricted Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise dispose of any of its properties or assets to, or purchase any property or assets from, or enter into or make or amend any transaction, contract, agreement,

S-41


Table of Contents

understanding, loan, advance or guarantee with, or for the benefit of, any Affiliate (each, an “Affiliate Transaction”), unless:
            (1) the Affiliate Transaction is on terms that are no less favorable to the Company or the relevant Restricted Subsidiary than those that would have been obtained in a comparable transaction by the Company or such Restricted Subsidiary with an unrelated Person; and
 
            (2) the Company delivers to the trustee:
            (a) with respect to any Affiliate Transaction or series of related Affiliate Transactions involving aggregate consideration in excess of $15.0 million, a resolution of the Board of Directors set forth in an officers’ certificate certifying that such Affiliate Transaction complies with this covenant and that such Affiliate Transaction has been approved by a majority of the disinterested members of the Board of Directors; and
 
            (b) with respect to any Affiliate Transaction or series of related Affiliate Transactions involving aggregate consideration in excess of $25.0 million, a written opinion as to the fairness to the Holders of such Affiliate Transaction from a financial point of view issued by an accounting, appraisal or investment banking firm of national standing.
          The following items will not be deemed to be Affiliate Transactions and, therefore, will not be subject to the provisions of the prior paragraph:
            (1) any employment or severance agreement or other employee compensation agreement, arrangement or plan, or any amendment thereto, entered into by the Company or any of its Restricted Subsidiaries in the ordinary course of business;
 
            (2) transactions between or among any of the Company and its Restricted Subsidiaries;
 
            (3) transactions with a Person that is an Affiliate of the Company solely because the Company owns an Equity Interest in such Person;
 
            (4) payment of reasonable directors’ fees and other benefits to persons who are not otherwise Affiliates of the Company;
 
            (5) provision of officers’ and directors’ indemnification and insurance in the ordinary course of business to the extent permitted by law;
 
            (6) transactions with any Income Fund Partnership in the ordinary course of business and consistent with past practices;
 
            (7) sales of Equity Interests (other than Disqualified Stock) to Affiliates of the Company; and
 
            (8) Restricted Payments that are permitted by the provisions of the indenture described above under the caption “— Restricted Payments.”
Designation of Restricted and Unrestricted Subsidiaries
          The Board of Directors of the Company may designate any Restricted Subsidiary of the Company to be an Unrestricted Subsidiary if that designation would not cause a Default. If a Restricted Subsidiary of the Company is designated as an Unrestricted Subsidiary, the aggregate fair market value of all outstanding Investments owned by the Company and its Restricted Subsidiaries in the Subsidiary properly designated will be deemed to be an Investment made as of the time of the designation and will reduce the amount available for Restricted Payments under the first paragraph of the covenant described above under the caption “— Restricted Payments” or represent Permitted Investments, as determined by the Company. That designation will only be permitted if the Investment would be permitted at that time and if the Subsidiary so designated otherwise meets the definition of an Unrestricted Subsidiary.

S-42


Table of Contents

          The Board of Directors of the Company may at any time designate any Unrestricted Subsidiary to be a Restricted Subsidiary of the Company; provided that such designation will be deemed to be an incurrence of Indebtedness by a Restricted Subsidiary of the Company of any outstanding Indebtedness of such Unrestricted Subsidiary and such designation will only be permitted if (1) such Indebtedness is permitted under the covenant described above under the caption “— Incurrence of Indebtedness and Issuance of Preferred Stock,” calculated on a pro forma basis as if such designation had occurred at the beginning of the four-quarter reference period, and (2) no Default or Event of Default would be in existence following such designation.
Additional Subsidiary Guarantees
          If the Company or any of its Restricted Subsidiaries acquires or creates another Material Domestic Subsidiary after the date of the indenture, or if any Restricted Subsidiary that is not already a Guarantor guarantees any other Indebtedness of the Company after such date, then in either case that Subsidiary will become a Guarantor by executing a supplemental indenture and delivering it to the trustee within 20 Business Days of the date on which it was acquired or created or guaranteed Indebtedness of the Company, as the case may be; provided, however, that the foregoing shall not apply to Subsidiaries of the Company that have properly been designated as Unrestricted Subsidiaries in accordance with the indenture for so long as they continue to constitute Unrestricted Subsidiaries.
Sale and Leaseback Transactions
          The Company will not, and will not permit any of its Restricted Subsidiaries to, enter into any sale and leaseback transaction; provided that the Company or any Guarantor may enter into a sale and leaseback transaction if:
            (1) the Company or that Guarantor, as applicable, could have (a) incurred Indebtedness in an amount equal to the Attributable Debt relating to such sale and leaseback transaction under the Fixed Charge Coverage Ratio test in the first paragraph of the covenant described above under the caption “— Incurrence of Indebtedness and Issuance of Preferred Stock” and (b) incurred a Lien to secure such Indebtedness pursuant to the covenant described above under the caption “— Liens;”
 
            (2) the gross cash proceeds of that sale and leaseback transaction are at least equal to the fair market value, as determined in good faith by the Board of Directors and set forth in an officers’ certificate delivered to the trustee, of the property that is the subject of that sale and leaseback transaction; and
 
            (3) the transfer of assets in that sale and leaseback transaction is permitted by, and the Company applies the proceeds of such transaction in compliance with, the covenant described above under the caption “— Repurchase at the Option of Holders — Asset Sales.”
Business Activities
          The Company will not, and will not permit any Restricted Subsidiary to, engage in any business other than the Oil and Gas Business, except to such extent as would not be material to the Company and its Restricted Subsidiaries taken as a whole.
Reports
          Whether or not required by the Commission, so long as any notes are outstanding, the Company will file with the Commission for public availability within the time periods specified in the Commission’s rules and regulations (unless the Commission will not accept such a filing), and the Company will furnish

S-43


Table of Contents

to the trustee and, upon its request, to any of the Holders of notes, within five Business Days of filing, or attempting to file, the same with the Commission:
            (1) all quarterly and annual financial and other information with respect to the Company and its Subsidiaries that would be required to be contained in a filing with the Commission on Forms 10-Q and 10-K if the Company were required to file such Forms, including a “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and, with respect to the annual information only, a report on the annual financial statements by the Company’s certified independent accountants; and
 
            (2) all current reports that would be required to be filed with the Commission on Form 8-K if the Company were required to file such reports.
          If the Company has designated any of its Subsidiaries as Unrestricted Subsidiaries, then the quarterly and annual financial information required by the preceding paragraph will include a reasonably detailed presentation, either on the face of the financial statements or in the footnotes thereto, and in Management’s Discussion and Analysis of Financial Condition and Results of Operations, of the financial condition and results of operations of the Company and its Restricted Subsidiaries separate from the financial condition and results of operations of the Unrestricted Subsidiaries of the Company.
Events of Default and Remedies
          In lieu of the Events of Default described in the accompanying prospectus under “Description of Debt Securities — Events of Default,” each of the following is an Event of Default with respect to the notes:
            (1) default for 30 days in the payment when due of interest on the notes, whether or not prohibited by the subordination provisions of the indenture;
 
            (2) default in payment when due of the principal of, or premium, if any, on the notes, whether or not prohibited by the subordination provisions of the indenture;
 
            (3) failure by the Company to comply with the provisions described under the captions “— Certain Covenants — Restricted Payments,” “— Certain Covenants — Incurrence of Indebtedness and Issuance of Preferred Stock” or “— Certain Covenants — Merger, Consolidation or Sale of Assets;”
 
            (4) failure by the Company to comply with the provisions described under the captions “— Repurchase at the Option of Holders — Asset Sales” or “— Repurchase at the Option of Holders — Change of Control;”
 
            (5) failure by the Company for 60 days after notice to comply with any of the other agreements in the indenture;
 
            (6) default under any mortgage, indenture or instrument under which there may be issued or by which there may be secured or evidenced any Indebtedness for money borrowed by the Company or any of its Restricted Subsidiaries (or the payment of which is guaranteed by the Company or any of its Restricted Subsidiaries), whether such Indebtedness or guarantee now exists, or is created after the date of the indenture, if that default:
            (a) is caused by a failure to pay principal of, or interest or premium, if any, on such Indebtedness prior to the expiration of the grace period provided in such Indebtedness (a “Payment Default”); or
 
            (b) results in the acceleration of such Indebtedness prior to its Stated Maturity,
  and, in each case, the principal amount of any such Indebtedness, together with the principal amount of any other such Indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated, aggregates $15.0 million or more;

S-44


Table of Contents

            (7) failure by the Company or any of its Subsidiaries to pay final judgments aggregating in excess of $15.0 million, which judgments are not paid, discharged or stayed (including a stay pending appeal) for a period of 60 days after the date of such final judgment (or, if later, the date when payment is due pursuant to such judgment);
 
            (8) except as permitted by the indenture, any Subsidiary Guarantee shall be held in any judicial proceeding to be unenforceable or invalid or shall cease for any reason to be in full force and effect or any Guarantor, or any Person acting on behalf of any Guarantor, shall deny or disaffirm its obligations under its Subsidiary Guarantee; and
 
            (9) certain events of bankruptcy, insolvency or reorganization described in the indenture with respect to the Company or any of its Significant Subsidiaries or any group of Subsidiaries of the Company that, taken as a whole, would constitute a Significant Subsidiary.
          In the case of an Event of Default arising from certain events of bankruptcy, insolvency or reorganization, with respect to the Company, any Subsidiary of the Company that is a Significant Subsidiary or any group of Subsidiaries of the Company that, taken together, would constitute a Significant Subsidiary, all outstanding notes will become due and payable immediately without further action or notice. If any other Event of Default occurs and is continuing, the trustee or the Holders of at least 25% in principal amount of the then outstanding notes may declare all the notes to be due and payable immediately. An Event of Default for the notes will not necessarily constitute an Event of Default for any other series of debt securities that may be issued under the indenture in the future and vice versa.
          Holders of the notes may not enforce the indenture or the notes except as provided in the indenture. Subject to certain limitations, Holders of a majority in principal amount of the then outstanding notes may direct the trustee in its exercise of any trust or power. The trustee may withhold from Holders notice of any continuing Default or Event of Default with respect to the notes if it determines that withholding notice is in their interest, except a Default or Event of Default relating to the payment of principal of, or interest or premium, if any, on, the notes.
          The Holders of a majority in principal amount of the notes then outstanding by notice to the trustee may on behalf of the Holders of all of the notes waive any past Default or Event of Default with respect to the notes and its consequences under the indenture except a continuing Default or Event of Default in the payment of principal of, or interest or premium, if any, on the notes or in respect of a covenant that cannot be amended without the consent of each Holder.
          In the case of any Event of Default with respect to the notes occurring by reason of any willful action or inaction taken or not taken by or on behalf of the Company with the intention of avoiding payment of the premium that the Company would have had to pay if the Company then had elected to redeem the notes on or after                     , 2009 pursuant to the optional redemption provisions of the indenture, an equivalent premium will also become and be immediately due and payable to the extent permitted by law upon the acceleration of the notes. If an Event of Default with respect to the notes occurs prior to                     , 2009 by reason of any willful action (or inaction) taken (or not taken) by or on behalf of the Company with the intention of avoiding the prohibition on redemption of the notes prior to that date, then the premium specified in the indenture with respect to the first year that the notes may be redeemed at the Company’s option (other than with the net cash proceeds of an Equity Offering) will also become immediately due and payable to the extent permitted by law upon the acceleration of the notes.
          The Company is required to deliver to the trustee annually a statement regarding compliance with the indenture. Upon becoming aware of any Default or Event of Default with respect to the notes, the Company is required to deliver to the trustee a statement specifying such Default or Event of Default.
No Personal Liability of Directors, Officers, Employees and Stockholders
          No director, officer, employee, incorporator or stockholder or other owner of Capital Stock of the Company or any Guarantor, as such, will have any liability for any obligations of the Company or any Guarantor under the notes, the indenture or the Subsidiary Guarantees, or for any claim based on, in

S-45


Table of Contents

respect of, or by reason of, such obligations or their creation. Each Holder of notes by accepting a note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the notes. The waiver may not be effective to waive liabilities under the federal securities laws.
Legal Defeasance and Covenant Defeasance
          The Company may, at its option and at any time, elect to have all of its obligations discharged with respect to the outstanding notes and all obligations of the Guarantors discharged with respect to their Subsidiary Guarantees (“Legal Defeasance”) except for:
            (1) the rights of Holders of outstanding notes to receive payments in respect of the principal of, and interest or premium, if any, on such notes when such payments are due from the trust referred to below;
 
            (2) the Company’s obligations with respect to the notes concerning issuing temporary notes, registration of notes, mutilated, destroyed, lost or stolen notes and the maintenance of an office or agency for payment and money for security payments held in trust;
 
            (3) the rights, powers, trusts, duties and immunities of the trustee, and the Company’s obligations in connection therewith; and
 
            (4) the Legal Defeasance provisions of the indenture.
          In addition, the Company may, at its option and at any time, elect to have its obligations released with respect to certain covenants that are described in the indenture (“Covenant Defeasance”) and thereafter any omission to comply with those covenants will not constitute a Default or Event of Default with respect to the notes. In the event Covenant Defeasance occurs, certain events (not including non-payment, bankruptcy, insolvency or reorganization events) described under “— Events of Default and Remedies” will no longer constitute an Event of Default with respect to the notes. If the Company exercises either its Legal Defeasance or Covenant Defeasance option, each Guarantor will be released and relieved of any obligations under its Subsidiary Guarantee and any security for the notes (other than the trust) will be released.
          In order to exercise either Legal Defeasance or Covenant Defeasance:
            (1) the Company must irrevocably deposit with the trustee, in trust, for the benefit of the Holders of the notes, cash in U.S. dollars, non-callable Government Securities, or a combination of cash in U.S. dollars and non-callable Government Securities, in amounts as will be sufficient, in the opinion of a nationally recognized firm of independent public accountants, to pay the principal of, and interest and premium, if any, on the outstanding notes on the date of fixed maturity or on the applicable redemption date, as the case may be, and the Company must specify whether the notes are being defeased to the date of fixed maturity or to a particular redemption date;
 
            (2) in the case of Legal Defeasance, the Company has delivered to the trustee an opinion of counsel reasonably acceptable to the trustee confirming that:
            (a) the Company has received from, or there has been published by, the Internal Revenue Service a ruling; or
 
            (b) since the date of the indenture, there has been a change in the applicable federal income tax law,
  in either case to the effect that, and based thereon such opinion of counsel will confirm that, the Holders of the outstanding notes will not recognize income, gain or loss for federal income tax purposes as a result of such Legal Defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Legal Defeasance had not occurred;

S-46


Table of Contents

            (3) in the case of Covenant Defeasance, the Company has delivered to the trustee an opinion of counsel reasonably acceptable to the trustee confirming that the Holders of the outstanding notes will not recognize income, gain or loss for federal income tax purposes as a result of such Covenant Defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Covenant Defeasance had not occurred;
 
            (4) no Default or Event of Default has occurred and is continuing on the date of such deposit (other than a Default or Event of Default resulting from the borrowing of funds to be applied to such deposit) or insofar as Events of Default from bankruptcy, insolvency or reorganization events are concerned, at any time in the period ending on the 91st day after the day of deposit;
 
            (5) such Legal Defeasance or Covenant Defeasance will not result in a breach or violation of, or constitute a default under, any material agreement or instrument (other than the indenture) to which the Company or any of its Subsidiaries is a party or by which the Company or any of its Subsidiaries is bound;
 
            (6) the Company must have delivered to the trustee an opinion of counsel to the effect that after the 91st day following the deposit (or, if any Holder or Beneficial Owner of notes is an insider of the Company, such later date as counsel may specify in such opinion), the trust funds will not be subject to the effect of any applicable bankruptcy, insolvency, reorganization or similar laws affecting creditors’ rights generally;
 
            (7) the Company must deliver to the trustee an officers’ certificate stating that the deposit was not made by the Company with the intent of preferring the Holders of notes over the other creditors of the Company with the intent of defeating, hindering, delaying or defrauding creditors of the Company or others; and
 
            (8) the Company must deliver to the trustee an officers’ certificate and an opinion of counsel, each stating that all conditions precedent relating to the Legal Defeasance or the Covenant Defeasance have been complied with.
Amendment, Supplement and Waiver
          Except as provided in the next three succeeding paragraphs, the indenture or the notes may be amended or supplemented with the consent of the Holders of at least a majority in principal amount of the notes then outstanding (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, notes), and any existing default or compliance with any provision of the indenture or the notes may be waived with the consent of the Holders of a majority in principal amount of the then outstanding notes (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, notes).
          Without the consent of each Holder affected, an amendment, supplement or waiver may not (with respect to any notes held by a non-consenting Holder):
            (1) reduce the principal amount of notes whose Holders must consent to an amendment, supplement or waiver;
 
            (2) reduce the principal of or change the fixed maturity of any note or alter the provisions with respect to the redemption or repurchase of the notes (other than provisions relating to the covenants described above under the caption “— Repurchase at the Option of Holders”);
 
            (3) reduce the rate of or change the time for payment of interest on any note;
 
            (4) waive a Default or Event of Default in the payment of principal of, or interest or premium, if any, on the notes (except a rescission of acceleration of the notes by the Holders of

S-47


Table of Contents

  at least a majority in principal amount of the notes and a waiver of the payment default that resulted from such acceleration);
 
            (5) make any note payable in currency other than that stated in the notes;
 
            (6) make any change in the provisions of the indenture relating to waivers of past Defaults or the rights of Holders of notes to receive payments of principal of, or interest or premium, if any, on the notes (other than as permitted in clause (7) below);
 
            (7) waive a redemption or repurchase payment with respect to any note (other than a payment required by one of the covenants described above under the caption “— Repurchase at the Option of Holders”);
 
            (8) release any Guarantor from any of its obligations under its Subsidiary Guarantee or the indenture, except in accordance with the terms of the indenture; or
 
            (9) make any change in the preceding amendment, supplement and waiver provisions.
          In addition, any amendment or supplement to, or waiver of, the provisions of the indenture relating to subordination that adversely affects the rights of the Holders of the notes will require the consent of the Holders of at least 75% in principal amount of notes then outstanding.
          Notwithstanding the preceding, without the consent of any Holder of notes, the Company, the Guarantors and the trustee may amend or supplement the indenture or the notes:
            (1) to cure any ambiguity, defect or inconsistency;
 
            (2) to provide for uncertificated notes in addition to or in place of certificated notes;
 
            (3) to provide for the assumption of the Company’s obligations to Holders of notes in the case of a merger or consolidation or sale of all or substantially all of the Company’s properties or assets;
 
            (4) to make any change that would provide any additional rights or benefits to the Holders of notes or that does not adversely affect the legal rights under the indenture of any Holder, provided that any change to conform the indenture to this offering memorandum will not be deemed to adversely affect the legal rights under the indenture of any holder;
 
            (5) to secure the notes or the Subsidiary Guarantees pursuant to the requirements of the covenant described above under the subheading “— Certain Covenants — Liens;”
 
            (6) to provide for the issuance of additional notes in accordance with the limitations set forth in the indenture;
 
            (7) to add any additional Guarantor or to evidence the release of any Guarantor from its Subsidiary Guarantee, in each case as provided in the indenture;
 
            (8) to comply with requirements of the Commission in order to effect or maintain the qualification of the indenture under the Trust Indenture Act;
 
            (9) to evidence or provide for the acceptance of appointment under the indenture of a successor trustee;
 
            (10) to add to, change or eliminate any provisions of the indenture in respect of one or more other series of debt securities; or
 
            (11) to establish the forms or terms of debt securities of any other series as permitted by the indenture.
          Neither the Company nor any of its Subsidiaries shall, directly or indirectly, pay or cause to be paid any consideration, whether by way of interest, fee or otherwise, to any Beneficial Owner or Holder of any notes for or as an inducement to any consent to any waiver, supplement or amendment of any terms

S-48


Table of Contents

or provisions of the indenture or the notes, unless such consideration is offered to be paid or agreed to be paid to all Beneficial Owners and Holders of the notes which so consent in the time frame set forth in solicitation documents relating to such consent.
Satisfaction and Discharge
          The indenture will be discharged and will cease to be of further effect as to all notes issued thereunder (except as to surviving rights of registration of transfer or exchange of the notes and as otherwise specified in the indenture), under the circumstances, and subject to the conditions, described in the accompanying prospectus under “Description of Debt Securities — Satisfaction and Discharge.”
Concerning the Trustee
          The trustee, J.P. Morgan Trust Company, National Association, also acts as trustee under the indenture for our 2012 Notes.
          If the trustee becomes a creditor of the Company or any Guarantor, the indenture limits its right to obtain payment of claims in certain cases, or to realize on certain property received in respect of any such claim as security or otherwise. The trustee will be permitted to engage in other transactions; however, if it acquires any conflicting interest (as defined in the Trust Indenture Act) after a Default has occurred and is continuing, it must eliminate such conflict within 90 days, apply to the Commission for permission to continue or resign.
          The Holders of a majority in principal amount of the then outstanding notes will have the right to direct the time, method and place of conducting any proceeding for exercising any remedy available to the trustee with respect to the notes, subject to certain exceptions. The indenture provides (by reference to the Trust Indenture Act) that in case an Event of Default occurs and is continuing, the trustee will be required, in the exercise of its power, to use the degree of care of a prudent man in the conduct of his own affairs. Subject to such provisions, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request of any Holder of notes, unless such Holder has offered to the trustee reasonable security or indemnity against any cost, expense or liability the trustee might incur.
Governing Law
          The indenture, the notes and the Subsidiary Guarantees will be governed by, and construed in accordance with, the laws of the State of New York.
Book-Entry, Delivery and Form
          Except as set forth below, notes will be issued only in registered, global form. Notes will be issued at the closing of this offering only against payment in immediately available funds.
          Initially, the notes will be represented by one or more permanent global notes in registered form without interest coupons (collectively, the “Global Notes”). The Global Notes will be deposited upon issuance with the trustee as custodian for The Depository Trust Company (“DTC”), in New York, New York, and registered in the name of DTC’s nominee, Cede & Co., in each case for credit to an account of a direct or indirect participant in DTC as described below. Beneficial interests in the Global Notes may be held through the Euroclear System (“Euroclear”) and Clearstream Banking, S.A. (“Clearstream”) (as indirect participants in DTC).
          Except as set forth below, the Global Notes may be transferred, in whole but not in part, only to another nominee of DTC or to a successor of DTC or its nominee. Beneficial interests in the Global Notes may not be exchanged for definitive notes in registered, certificated form (“Certificated Notes”), except in the limited circumstances described below. See “— Exchange of Global Notes for Certificated Notes.” In addition, transfers of beneficial interests in the Global Notes will be subject to the applicable rules and procedures of DTC and its direct or indirect participants (including, if applicable, those of Euroclear and Clearstream), which may change from time to time.

S-49


Table of Contents

Depository Procedures
          The following description of the operations and procedures of DTC, Euroclear and Clearstream are provided solely as a matter of convenience. These operations and procedures are solely within the control of the respective settlement systems and are subject to changes by them. We take no responsibility for these operations and procedures and urge investors to contact the system or their participants directly to discuss these matters.
          DTC has advised us that DTC is a limited-purpose trust company created to hold securities for its participating organizations (collectively, the “Participants”) and to facilitate the clearance and settlement of transactions in those securities between Participants through electronic book-entry changes in accounts of its Participants. The Participants include securities brokers and dealers (including the underwriters), banks, trust companies, clearing corporations and certain other organizations. Access to DTC’s system is also available to other entities such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with a Participant, either directly or indirectly (collectively, the “Indirect Participants”). Persons who are not Participants may beneficially own securities held by or on behalf of DTC only through the Participants or the Indirect Participants. The ownership interests in, and transfers of ownership interests in, each security held by or on behalf of DTC are recorded on the records of the Participants and Indirect Participants.
          DTC has also advised us that, pursuant to procedures established by it:
            (1) upon deposit of the Global Notes, DTC will credit the accounts of Participants designated by the underwriters with portions of the principal amount of the Global Notes; and
 
            (2) ownership of these interests in the Global Notes will be shown on, and the transfer of ownership of these interests will be effected only through, records maintained by DTC (with respect to the Participants) or by the Participants and the Indirect Participants (with respect to other owners of beneficial interests in the Global Notes).
          Investors in the Global Notes who are Participants in DTC’s system may hold their interests therein directly through DTC. Investors in the Global Notes who are not Participants may hold their interests therein indirectly through organizations (including Euroclear and Clearstream) which are Participants in such system. Euroclear and Clearstream may hold interests in the Global Notes on behalf of their participants through customers’ securities accounts in their respective names on the books of their respective depositories, which are Euroclear Bank S.A./ N.V., as operator of Euroclear, and Citibank, N.A., as operator of Clearstream. All interests in a Global Note, including those held through Euroclear or Clearstream, may be subject to the procedures and requirements of DTC. Those interests held through Euroclear or Clearstream may also be subject to the procedures and requirements of such systems.
          The laws of some states require that certain Persons take physical delivery in definitive form of securities that they own. Consequently, the ability to transfer beneficial interests in a Global Note to such Persons will be limited to that extent. Because DTC can act only on behalf of Participants, which in turn act on behalf of Indirect Participants, the ability of a Person having beneficial interests in a Global Note to pledge such interests to Persons that do not participate in the DTC system, or otherwise take actions in respect of such interests, may be affected by the lack of a physical certificate evidencing such interests.
          Except as described below, owners of an interest in the Global Notes will not have notes registered in their names, will not receive physical delivery of Certificated Notes and will not be considered the registered owners or “Holders” thereof under the indenture for any purpose.
          Payments in respect of the principal of, and interest and premium, if any, on a Global Note registered in the name of DTC or its nominee will be payable to DTC in its capacity as the registered Holder under the indenture. Under the terms of the indenture, the Company and the trustee will treat the Persons in whose names the notes, including the Global Notes, are registered as the owners of the notes

S-50


Table of Contents

for the purpose of receiving payments and for all other purposes. Consequently, neither the Company, the trustee nor any agent of the Company or the trustee has or will have any responsibility or liability for:
            (1) any aspect of DTC’s records or any Participant’s or Indirect Participant’s records relating to or payments made on account of beneficial ownership interests in the Global Notes or for maintaining, supervising or reviewing any of DTC’s records or any Participant’s or Indirect Participant’s records relating to the beneficial ownership interests in the Global Notes; or
 
            (2) any other matter relating to the actions and practices of DTC or any of its Participants or Indirect Participants.
          DTC has advised us that its current practice, at the due date of any payment in respect of securities such as the notes, is to credit the accounts of the relevant Participants with the payment on the payment date unless DTC has reason to believe it will not receive payment on such payment date. Each relevant Participant is credited with an amount proportionate to its beneficial ownership of an interest in the principal amount of the notes as shown on the records of DTC. Payments by the Participants and the Indirect Participants to the beneficial owners of notes will be governed by standing instructions and customary practices and will be the responsibility of the Participants or the Indirect Participants and will not be the responsibility of DTC, the trustee or the Company. Neither the Company nor the trustee will be liable for any delay by DTC or any of its Participants in identifying the beneficial owners of the notes, and the Company and the trustee may conclusively rely on and will be protected in relying on instructions from DTC or its nominee for all purposes.
          Transfers between Participants in DTC will be effected in accordance with DTC’s procedures, and will be settled in same-day funds, and transfers between participants in Euroclear and Clearstream will be effected in accordance with their respective rules and operating procedures.
          Cross-market transfers between the Participants in DTC, on the one hand, and Euroclear or Clearstream participants, on the other hand, will be effected through DTC in accordance with DTC’s rules on behalf of Euroclear or Clearstream, as the case may be, by its depositary; however, such cross-market transactions will require delivery of instructions to Euroclear or Clearstream, as the case may be, by the counterparty in such system in accordance with the rules and procedures and within the established deadlines (Brussels time) of such system. Euroclear or Clearstream, as the case may be, will, if the transaction meets its settlement requirements, deliver instructions to its respective depositary to take action to effect final settlement on its behalf by delivering or receiving interests in the relevant Global Note in DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Euroclear participants and Clearstream participants may not deliver instructions directly to the depositories for Euroclear or Clearstream.
          DTC has advised us that it will take any action permitted to be taken by a Holder of notes only at the direction of one or more Participants to whose account DTC has credited the interests in the Global Notes and only in respect of such portion of the aggregate principal amount of the notes as to which such Participant or Participants has or have given such direction. However, if there is an Event of Default under the notes, DTC reserves the right to exchange the Global Notes for Certificated Notes and to distribute such notes to its Participants.
          Although DTC, Euroclear and Clearstream have agreed to the foregoing procedures to facilitate transfers of interests in the Global Notes among participants in DTC, Euroclear and Clearstream, they are under no obligation to perform or to continue to perform such procedures, and may discontinue such procedures at any time. None of the Company, the trustee or any of their respective agents will have any responsibility for the performance by DTC, Euroclear or Clearstream or their respective participants or indirect participants of their respective obligations under the rules and procedures governing their operations.

S-51


Table of Contents

Exchange of Global Notes for Certificated Notes
          A Global Note is exchangeable for Certificated Notes in minimum denominations of $1,000 and in integral multiples of $1,000, if:
            (1) DTC (a) notifies us that it is unwilling or unable to continue as depositary for the Global Notes or (b) has ceased to be a clearing agency registered under the Exchange Act and in either event the Company fails to appoint a successor depositary within 90 days; or
 
            (2) there has occurred and is continuing an Event of Default and DTC notifies the trustee of its decision to exchange the Global Note for Certificated Notes.
          Certificated Notes delivered in exchange for any Global Note or beneficial interests in Global Notes will be registered in the names, and issued in any approved denominations, requested by or on behalf of the depositary (in accordance with its customary procedures).
Same Day Settlement and Payment
          The Company will make payments in respect of the notes represented by the Global Notes (including principal, premium, if any, and interest) by wire transfer of immediately available funds to the accounts specified by the Global Note Holder. The Company will make all payments of principal, interest and premium, if any, with respect to Certificated Notes by wire transfer of immediately available funds to the accounts specified by the Holders of the Certificated Notes or, if no such account is specified, by mailing a check to each such Holder’s registered address. The notes represented by the Global Notes are expected to trade in DTC’s Same-Day Funds Settlement System, and any permitted secondary market trading activity in such notes will, therefore, be required by DTC to be settled in immediately available funds. The Company expects that secondary trading in any Certificated Notes will also be settled in immediately available funds.
          Because of time zone differences, the securities account of a Euroclear or Clearstream participant purchasing an interest in a Global Note from a Participant in DTC will be credited, and any such crediting will be reported to the relevant Euroclear or Clearstream participant, during the securities settlement processing day (which must be a business day for Euroclear and Clearstream) immediately following the settlement date of DTC. DTC has advised us that cash received in Euroclear or Clearstream as a result of sales of interests in a Global Note by or through a Euroclear or Clearstream participant to a Participant in DTC will be received with value on the settlement date of DTC but will be available in the relevant Euroclear or Clearstream cash account only as of the business day for Euroclear or Clearstream following DTC’s settlement date.
Certain Definitions
          Set forth below are certain defined terms used in the indenture. Reference is made to the indenture for a full disclosure of all such terms, as well as any other capitalized terms used herein for which no definition is provided.
          “ACNTA” (Adjusted Consolidated Net Tangible Assets) means (without duplication), as of the date of determination:
            (1) the sum of:
            (a) discounted future net revenue from proved crude oil and natural gas reserves of the Company and its Restricted Subsidiaries calculated in accordance with SEC guidelines before any state or federal income taxes, as estimated in a reserve report prepared as of the end of the Company’s most recently completed fiscal year, which reserve report is prepared or reviewed by independent petroleum engineers as to reserves accounting for at least 80% of all such discounted future net revenue and by the Company’s petroleum engineers with respect to any other such reserves covered by such

S-52


Table of Contents

  report, as increased by, as of the date of determination, the discounted future net revenue from:
            (i) estimated proved crude oil and natural gas reserves of the Company and its Restricted Subsidiaries attributable to acquisitions consummated since the date of such year-end reserve report, and
 
            (ii) estimated crude oil and natural gas reserves of the Company and its Restricted Subsidiaries attributable to extensions, discoveries and other additions and upward determinations of estimates of proved crude oil and natural gas reserves (including previously estimated development costs incurred during the period and the accretion of discount since the prior year end) due to exploration, development or exploitation, production or other activities which reserves were not reflected in such year-end reserve report,
in each case calculated in accordance with SEC guidelines (utilizing the prices utilized in such year-end reserve report), and decreased by, as of the date of determination, the discounted future net revenue attributable to
            (iii) estimated proved crude oil and natural gas reserves of the Company and its Restricted Subsidiaries reflected in such year-end reserve report produced or disposed of since the date of such year-end reserve report and
 
            (iv) reductions in the estimated proved crude oil and natural gas reserves of the Company and its Restricted Subsidiaries reflected in such year-end reserve report since the date of such year-end reserve report attributable to downward determinations of estimates of proved crude oil and natural gas reserves due to exploration, development or exploitation, production or other activities conducted or otherwise occurring since the date of such year-end reserve report,
in each case calculated in accordance with SEC guidelines (utilizing the prices utilized in such year-end reserve report); provided, however, that, in the case of each of the determinations made pursuant to clauses (i) through (iv), such increases and decreases shall be as estimated by the Company’s engineers, except that if as a result of such acquisitions, dispositions, discoveries, extensions or revisions, there is a Material Change, then such increases and decreases in the discounted future net revenue shall be confirmed in writing by an independent petroleum engineer;
            (b) the capitalized costs that are attributable to crude oil and natural gas properties of the Company and its Restricted Subsidiaries to which no proved crude oil and natural gas reserves are attributed, based on the Company’s books and records as of a date no earlier than the date of the Company’s latest annual or quarterly financial statements;
 
            (c) the Net Working Capital on a date no earlier than the date of the Company’s latest annual or quarterly financial statements; and
 
            (d) the greater of (I) the net book value on a date no earlier than the date of the Company’s latest annual or quarterly financial statements and (II) the appraised value, as estimated by independent appraisers, of other tangible assets of the Company and its Restricted Subsidiaries as of a date no earlier than the date of the Company’s latest audited financial statements;

S-53


Table of Contents

            (2) minus, to the extent not otherwise taken into account in the immediately preceding clause (1), the sum of:
            (a) minority interests;
 
            (b) any net gas balancing liabilities of the Company and its Restricted Subsidiaries reflected in the Company’s latest audited financial statements;
 
            (c) the discounted future net revenue, calculated in accordance with SEC guidelines (utilizing the same prices utilized in the Company’s year-end reserve report), attributable to reserves subject to participation interests, overriding royalty interests or other interests of third parties, pursuant to participation, partnership, vendor financing or other agreements then in effect, or which otherwise are required to be delivered to third parties;
 
            (d) the discounted future net revenue, calculated in accordance with SEC guidelines (utilizing the same prices utilized in the Company’s year-end reserve report), attributable to reserves that are required to be delivered to third parties to fully satisfy the obligations of the Company and its Restricted Subsidiaries with respect to Volumetric Production Payments on the schedules specified with respect thereto; and
 
            (e) the discounted future net revenue, calculated in accordance with SEC guidelines, attributable to reserves subject to Dollar-Denominated Production Payments that, based on the estimates of production included in determining the discounted future net revenue specified in the immediately preceding clause (1)(a) (utilizing the same prices utilized in the Company’s year-end reserve report), would be necessary to satisfy fully the obligations of the Company and its Restricted Subsidiaries with respect to Dollar-Denominated Production Payments on the schedules specified with respect thereto.
          If the Company changes its method of accounting for its oil and gas properties from the successful efforts method to the full cost method or a similar method of accounting, ACNTA will continue to be calculated as if the Company were still using the successful efforts method of accounting.
          “Acquired Debt” means, with respect to any specified Person:
            (1) Indebtedness of any other Person existing at the time such other Person was merged with or into or became a Subsidiary of such specified Person, whether or not such Indebtedness is incurred in connection with, or in contemplation of, such other Person merging with or into, or becoming a Subsidiary of, such specified Person; and
 
            (2) Indebtedness secured by a Lien encumbering any asset acquired by such specified Person.
          “Additional Assets” means:
            (1) any assets used or useful in the Oil and Gas Business;
 
            (2) the Capital Stock of a Person that becomes a Restricted Subsidiary as a result of the acquisition of such Capital Stock by the Company or another Restricted Subsidiary; or
 
            (3) Capital Stock constituting a minority in any Person that at such time is a Restricted Subsidiary;
provided, however, that any such Restricted Subsidiary described in clause (2) or (3) is primarily engaged in the Oil and Gas Business.
          “Affiliate” of any specified Person means any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with such specified Person. For purposes of this definition, “control,” as used with respect to any Person, means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such Person, whether through the

S-54


Table of Contents

ownership of voting securities, by agreement or otherwise; provided that beneficial ownership of 10% or more of the Voting Stock of a Person will be deemed to be control. For purposes of this definition, the terms “controlling,” “controlled by” and “under common control with” have correlative meanings.
          “Asset Sale” means:
            (1) the sale, lease, conveyance or other disposition of any properties or assets (including by way of a Production Payment or sale and leaseback transaction); provided that the disposition of all or substantially all of the properties or assets of the Company and its Restricted Subsidiaries taken as a whole will be governed by the provisions of the indenture described above under the caption “— Repurchase at the Option of Holders — Change of Control” and/or the provisions described above under the caption “— Certain Covenants — Merger, Consolidation or Sale of Assets” and not by the provisions of the Asset Sale covenant; and
 
            (2) the issuance of Equity Interests in any of the Company’s Restricted Subsidiaries or the sale of Equity Interests in any of its Restricted Subsidiaries.
          Notwithstanding the preceding, the following items will not be deemed to be Asset Sales:
            (1) any single transaction or series of related transactions that involves properties or assets having a fair market value of less than $2.5 million;
 
            (2) a transfer of assets between or among any of the Company and its Restricted Subsidiaries;
 
            (3) an issuance or sale of Equity Interests by a Restricted Subsidiary to the Company or to another Restricted Subsidiary;
 
            (4) the sale, lease or other disposition of equipment, inventory, accounts receivable or other properties or assets in the ordinary course of business, including, without limitation, any abandonment, farm-in, farm-out, lease or sublease of any oil and gas properties or the forfeiture or other disposition of such properties pursuant to standard form operating agreements, in each case in the ordinary course of business in a manner customary in the Oil and Gas Business;
 
            (5) the sale or other disposition of cash or Cash Equivalents;
 
            (6) a Restricted Payment that is permitted by the covenant described above under the caption “— Certain Covenants — Restricted Payments” or a Permitted Investment;
 
            (7) any trade or exchange by the Company or any Restricted Subsidiary of oil and gas properties or other properties or assets for oil and gas properties or other properties or assets owned or held by another Person, provided that the fair market value of the properties or assets traded or exchanged by the Company or such Restricted Subsidiary (together with any cash) is reasonably equivalent to the fair market value of the properties or assets (together with any cash) to be received by the Company or such Restricted Subsidiary, and provided further that any net cash received must be applied in accordance with the provisions described above under the caption “— Repurchase at the Option of Holders — Asset Sales;”
 
            (8) the creation or perfection of a Lien (but not the sale or other disposition of the properties or assets subject to such Lien); and
 
            (9) surrender or waiver of contract rights or the settlement, release or surrender of contract, tort or other claims of any kind.
          “Attributable Debt” in respect of a sale and leaseback transaction means, at the time of determination, the present value of the obligation of the lessee for net rental payments during the remaining term of the lease included in such sale and leaseback transaction including any period for which such lease has been extended or may, at the option of the lessor, be extended. Such present value shall be calculated using a discount rate equal to the rate of interest implicit in such transaction, determined in accordance with GAAP.

S-55


Table of Contents

          “Beneficial Owner” has the meaning assigned to such term in Rule 13d-3 and Rule 13d-5 under the Exchange Act, except that in calculating the beneficial ownership of any particular “person” (as that term is used in Section 13(d)(3) of the Exchange Act), such “person” will be deemed to have beneficial ownership of all securities that such “person” has the right to acquire by conversion or exercise of other securities, whether such right is currently exercisable or is exercisable only upon the occurrence of a subsequent condition. The terms “Beneficially Owns” and “Beneficially Owned” have correlative meanings.
          “Board of Directors” means:
            (1) with respect to a corporation, the board of directors of the corporation;
 
            (2) with respect to a partnership, the board of directors of the general partner of the partnership; and
 
            (3) with respect to any other Person, the board or committee of such Person serving a similar function.
          “Board Resolution” means a copy of a resolution certified by the Secretary or an Assistant Secretary of the applicable Person to have been duly adopted by the Board of Directors of such Person and to be in full force and effect on the date of such certification, and delivered to the trustee.
          “Business Day” means each day that is not a Saturday, Sunday or other day on which banking institutions in Denver, Colorado or in New York, New York or another place of payment are authorized or required by law to close.
          “Capital Lease Obligation” means, at the time any determination is to be made, the amount of the liability in respect of a capital lease that would at that time be required to be capitalized on a balance sheet in accordance with GAAP.
          “Capital Stock” means:
            (1) in the case of a corporation, corporate stock;
 
            (2) in the case of an association or business entity, any and all shares, interests, participations, rights or other equivalents (however designated) of corporate stock;
 
            (3) in the case of a partnership or limited liability company, partnership or membership interests (whether general or limited); and
 
            (4) any other interest or participation that confers on a Person the right to receive a share of the profits and losses of, or distributions of assets of, the issuing Person.
          “Cash Equivalents” means:
            (1) United States dollars;
 
            (2) securities issued or directly and fully guaranteed or insured by the United States government or any agency or instrumentality of the United States government (provided that the full faith and credit of the United States is pledged in support of those securities) having maturities of not more than six months from the date of acquisition;
 
            (3) certificates of deposit and eurodollar time deposits with maturities of six months or less from the date of acquisition, bankers’ acceptances with maturities not exceeding six months and overnight bank deposits, in each case, with any lender party to the Credit Agreement or with any domestic commercial bank having capital and surplus in excess of $500.0 million and a Thomson Bank Watch Rating of “B” or better;
 
            (4) repurchase obligations with a term of not more than seven days for underlying securities of the types described in clauses (2) and (3) above entered into with any financial institution meeting the qualifications specified in clause (3) above;

S-56


Table of Contents

            (5) commercial paper having the highest rating obtainable from Moody’s Investors Service, Inc. or Standard & Poor’s Ratings Services and in each case maturing within six months after the date of acquisition; and
 
            (6) money market funds at least 95% of the assets of which constitute Cash Equivalents of the kinds described in clauses (1) through (5) of this definition.
          “Change of Control” means the occurrence of any of the following:
            (1) the direct or indirect sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the properties or assets (including Capital Stock of the Restricted Subsidiaries) of the Company and its Restricted Subsidiaries taken as a whole, to any “person” (as that term is used in Section 13(d)(3) of the Exchange Act);
 
            (2) the adoption of a plan relating to the liquidation or dissolution of the Company;
 
            (3) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) becomes the Beneficial Owner, directly or indirectly, of more than 50% of the Voting Stock of the Company, measured by voting power rather than number of shares; or
 
            (4) the first day on which a majority of the members of the Board of Directors of the Company are not Continuing Directors.
          “Commission” or “SEC” means the Securities and Exchange Commission.
          “Consolidated Cash Flow” means, with respect to any specified Person for any period, the Consolidated Net Income of such Person for such period plus:
            (1) an amount equal to any extraordinary loss plus any net loss realized by such Person or any of its Restricted Subsidiaries in connection with an Asset Sale, to the extent such losses were deducted in computing such Consolidated Net Income; plus
 
            (2) provision for taxes based on income or profits of such Person and its Restricted Subsidiaries for such period, to the extent that such provision for taxes was deducted in computing such Consolidated Net Income; plus
 
            (3) consolidated interest expense of such Person and its Restricted Subsidiaries for such period, whether paid or accrued and whether or not capitalized (excluding any interest attributable to Dollar-Denominated Production Payments but including, without limitation, amortization of debt issuance costs and original issue discount, non-cash interest payments, the interest component of any deferred payment obligations, the interest component of all payments associated with Capital Lease Obligations, imputed interest with respect to Attributable Debt, commissions, discounts and other fees and charges incurred in respect of letter of credit or bankers’ acceptance financings), and net of the effect of all payments made or received pursuant to Hedging Obligations, to the extent that any such expense was deducted in computing such Consolidated Net Income; plus
 
            (4) depreciation, depletion and amortization (including amortization of intangibles but excluding amortization of prepaid cash expenses that were paid in a prior period), impairment and other non-cash expenses (excluding any such non-cash expense to the extent that it represents an accrual of or reserve for cash expenses in any future period or amortization of a prepaid cash expense that was paid in a prior period) of such Person and its Restricted Subsidiaries for such period to the extent that such depreciation, depletion and amortization, impairment and other non-cash expenses were deducted in computing such Consolidated Net Income; plus

S-57


Table of Contents

            (5) unrealized non-cash losses resulting from foreign currency balance sheet adjustments required by GAAP to the extent such losses were deducted in computing such Consolidated Net Income; minus
 
            (6) non-cash items increasing such Consolidated Net Income for such period, other than items that were accrued in the ordinary course of business; minus (to the extent included in determining Consolidated Net Income);
 
            (7) the sum of (x) the amount of deferred revenues that are amortized during such period and are attributable to reserves that are subject to Volumetric Production Payments and (y) amounts recorded in accordance with GAAP as repayments of principal and interest pursuant to Dollar-Denominated Production Payments,
in each case, on a consolidated basis and determined in accordance with GAAP.
          “Consolidated Net Income” means, with respect to any specified Person for any period, the aggregate of the Net Income of such Person and its Restricted Subsidiaries for such period, on a consolidated basis, determined in accordance with GAAP; provided that:
            (1) the Net Income (but not loss) of any Person that is not a Restricted Subsidiary or that is accounted for by the equity method of accounting will be included, but only to the extent of the amount of dividends or distributions paid in cash to the specified Person or a Restricted Subsidiary of the Person;
 
            (2) the Net Income of any Restricted Subsidiary will be excluded to the extent that the declaration or payment of dividends or similar distributions by that Restricted Subsidiary of that Net Income is not at the date of determination permitted without any prior governmental approval (that has not been obtained) or, directly or indirectly, by operation of the terms of its charter or any agreement, instrument, judgment, decree, order, statute, rule or governmental regulation applicable to that Restricted Subsidiary or its stockholders, partners or members;
 
            (3) the cumulative effect of a change in accounting principles will be excluded;
 
            (4) income resulting from transfers of assets (other than cash) between the Company or any of its Restricted Subsidiaries, on the one hand, and an Unrestricted Subsidiary, on the other hand, will be excluded;
 
            (5) any write-downs of non-current assets will be excluded; provided that any ceiling limitation write-downs under Commission guidelines shall be treated as capitalized costs, as if such write-downs had not occurred; and
 
            (6) any unrealized non-cash gains or losses or charges in respect of hedge or non-hedge derivatives (including those resulting from the application of FAS 133) will be excluded.
In addition, notwithstanding the preceding, for the purposes of the covenant described under “— Certain Covenants — Restricted Payments” only, there shall be excluded from Consolidated Net Income any nonrecurring charges relating to any premium or penalty paid, write off of deferred finance costs or other charges in connection with redeeming or retiring any Indebtedness prior to its Stated Maturity.
          “Continuing Directors” means, as of any date of determination, any member of the Board of Directors of the Company who:
            (1) was a member of such Board of Directors on the date of the indenture; or
 
            (2) was nominated for election or elected to such Board of Directors with the approval of a majority of the Continuing Directors who were members of such Board at the time of such nomination or election.
          “Credit Agreement” means that certain Second Amended and Restated Credit Agreement, dated as of September 23, 2004, among Whiting, the Company, the financial institutions parties thereto, and

S-58


Table of Contents

JPMorgan Chase Bank, N.A., as Administrative Agent, providing for revolving credit borrowings, including any related notes, guarantees, collateral documents, instruments and agreements executed in connection therewith, and in each case as amended, restated, modified, renewed, refunded, replaced or refinanced from time to time.
          “Credit Facilities” means one or more debt facilities (including, without limitation, the Credit Agreement), commercial paper facilities or secured capital markets financings, in each case with banks or other institutional lenders or institutional investors providing for revolving credit loans, term loans, receivables financing (including through the sale of receivables to such lenders or to special purpose entities formed to borrow from (or sell receivables to) such lenders against such receivables), letters of credit or secured capital markets financings, in each case, as amended, restated, modified, renewed, refunded, replaced or refinanced (including refinancing with any capital markets transaction) in whole or in part from time to time.
          “Default” means any event that is, or with the passage of time or the giving of notice or both would be, an Event of Default.
          “Designated Senior Debt” means:
            (1) any Indebtedness outstanding from time to time under the Credit Facilities; and
 
            (2) any other Senior Debt permitted under the indenture the principal amount of which is $25.0 million or more and that is from time to time designated by the Company as “Designated Senior Debt.”
          “Disqualified Stock” means any Capital Stock that, by its terms (or by the terms of any security into which it is convertible, or for which it is exchangeable, in each case at the option of the holder of the Capital Stock), or upon the happening of any event, matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at the option of the holder of the Capital Stock, in whole or in part, on or prior to the date that is 91 days after the date on which the notes mature. Notwithstanding the preceding sentence, any Capital Stock that would constitute Disqualified Stock solely because the holders of the Capital Stock have the right to require the Company to repurchase or redeem such Capital Stock upon the occurrence of a change of control or an asset sale will not constitute Disqualified Stock if the terms of such Capital Stock provide that the Company may not repurchase or redeem any such Capital Stock pursuant to such provisions unless such repurchase or redemption complies with the covenant described above under the caption “— Certain Covenants — Restricted Payments.”
          “Dollar-Denominated Production Payments” means production payment obligations recorded as liabilities in accordance with GAAP, together with all undertakings and obligations in connection therewith.
          “Domestic Subsidiary” means any Restricted Subsidiary of the Company other than a Foreign Subsidiary.
          “Equity Interests” means Capital Stock and all warrants, options or other rights to acquire Capital Stock (but excluding any debt security that is convertible into, or exchangeable for, Capital Stock).
          “Equity Offering” means any public or private sale of Capital Stock (other than Disqualified Stock) made for cash on a primary basis by the Company after the date of the indenture.
          “Existing Indebtedness” means the aggregate principal amount of Indebtedness of the Company and its Restricted Subsidiaries (other than Indebtedness under the Credit Agreement which is considered incurred under the first paragraph under the covenant entitled “Incurrence of Indebtedness and Issuance of Preferred Stock”) in existence on the date of the indenture, until such amounts are repaid.
          “Fixed Charge Coverage Ratio” means with respect to any specified Person for any four-quarter reference period, the ratio of the Consolidated Cash Flow of such Person for such period to the Fixed Charges of such Person for such period. In the event that the specified Person or any of its Restricted Subsidiaries incurs, assumes, guarantees, repays, repurchases or redeems any Indebtedness (other than

S-59


Table of Contents

ordinary working capital borrowings) or issues, repurchases or redeems preferred stock subsequent to the commencement of the applicable four-quarter reference period and on or prior to the date on which the event for which the calculation of the Fixed Charge Coverage Ratio is made (the “Calculation Date”), then the Fixed Charge Coverage Ratio will be calculated giving pro forma effect to such incurrence, assumption, guarantee, repayment, repurchase or redemption of Indebtedness, or such issuance, repurchase or redemption of preferred stock, and the use of the proceeds therefrom as if the same had occurred at the beginning of such period.
          In addition, for purposes of calculating the Fixed Charge Coverage Ratio:
            (1) acquisitions that have been made by the specified Person or any of its Restricted Subsidiaries, including through mergers or consolidations and including any related financing transactions, subsequent to the commencement of the applicable four-quarter reference period and on or prior to the Calculation Date will be given pro forma effect as if they had occurred on the first day of such period, including any Consolidated Cash Flow and any pro forma expense and cost reductions that have occurred or are reasonably expected to occur, in the reasonable judgment of the chief financial or accounting officer of the Company (regardless of whether those cost savings or operating improvements could then be reflected in pro forma financial statements in accordance with Regulation S-X promulgated under the Securities Act or any other regulation or policy of the Commission related thereto);
 
            (2) the Consolidated Cash Flow attributable to discontinued operations, as determined in accordance with GAAP, and operations or businesses disposed of prior to the Calculation Date, will be excluded; and
 
            (3) the Fixed Charges attributable to discontinued operations, as determined in accordance with GAAP, and operations or businesses disposed of prior to the Calculation Date, will be excluded, but only to the extent that the obligations giving rise to such Fixed Charges will not be obligations of the specified Person or any of its Restricted Subsidiaries following the Calculation Date.
          “Fixed Charges” means, with respect to any specified Person for any period, the sum, without duplication, of:
            (1) the consolidated interest expense of such Person and its Restricted Subsidiaries for such period, whether paid or accrued (excluding any interest attributable to Dollar-Denominated Production Payments but including, without limitation, amortization of debt issuance costs and original issue discount, non-cash interest payments, the interest component of any deferred payment obligations, the interest component of all payments associated with Capital Lease Obligations, imputed interest with respect to Attributable Debt, commissions, discounts and other fees and charges incurred in respect of letter of credit or bankers’ acceptance financings), and net of the effect of all payments made or received pursuant to Hedging Obligations; plus
 
            (2) the consolidated interest expense of such Person and its Restricted Subsidiaries that was capitalized during such period; plus
 
            (3) any interest expense on Indebtedness of another Person that is guaranteed by such Person or one of its Restricted Subsidiaries or secured by a Lien on assets of such Person or one of its Restricted Subsidiaries, whether or not such guarantee or Lien is called upon; plus
 
            (4) the product of (a) all dividends, whether paid or accrued and whether or not in cash, on any series of preferred stock of such Person or any of its Restricted Subsidiaries, other than dividends on Equity Interests payable solely in Equity Interests of the Company (other than Disqualified Stock) or to the Company or a Restricted Subsidiary of the Company, times (b) a fraction, the numerator of which is one and the denominator of which is one minus the then current combined federal, state and local statutory tax rate of such Person, expressed as a decimal,
in each case, on a consolidated basis and in accordance with GAAP.

S-60


Table of Contents

          “Foreign Subsidiary” means any Restricted Subsidiary of the Company that was not formed under the laws of the United States or any state of the United States or the District of Columbia and that conducts substantially all of its operations outside the United States.
          “GAAP” means generally accepted accounting principles in the United States, which are in effect on the date of the indenture.
          The term “guarantee” means a guarantee other than by endorsement of negotiable instruments for collection in the ordinary course of business, direct or indirect, in any manner including, without limitation, by way of a pledge of assets or through letters of credit or reimbursement agreements in respect thereof, of all or any part of any Indebtedness. When used as a verb, “guarantee” has a correlative meaning.
          “Guarantors” means each of:
            (1) Whiting Oil and Gas Corporation and Whiting Programs, Inc., each a Delaware corporation, and Equity Oil Company, a Colorado corporation; and
 
            (2) any other Restricted Subsidiary of the Company that becomes a Guarantor in accordance with the provisions of the indenture;
and their respective successors and assigns.
          “Hedging Obligations” means, with respect to any specified Person, the obligations of such Person incurred in the normal course of business and consistent with past practices and not for speculative purposes under:
            (1) interest rate swap agreements, interest rate cap agreements and interest rate collar agreements entered into with one of more financial institutions and designed to protect the Person or any of its Restricted Subsidiaries entering into the agreement against fluctuations in interest rates with respect to Indebtedness incurred and not for purposes of speculation;
 
            (2) foreign exchange contracts and currency protection agreements entered into with one of more financial institutions and designed to protect the Person or any of its Restricted Subsidiaries entering into the agreement against fluctuations in currency exchanges rates with respect to Indebtedness incurred and not for purposes of speculation;
 
            (3) any commodity futures contract, commodity option or other similar agreement or arrangement designed to protect against fluctuations in the price of oil, natural gas or other commodities used, produced, processed or sold by that Person or any of its Restricted Subsidiaries at the time; and
 
            (4) other agreements or arrangements designed to protect such Person or any of its Restricted Subsidiaries against fluctuations in interest rates, commodity prices or currency exchange rates.
          “Holder” means a Person in whose name a Note is registered.
          “Income Fund Partnerships” means Whiting-Park Production Partnership, Ltd., Whiting-Madison Production Partnership, Ltd. and Whiting 1988 Production Limited Partnership, Ltd., each a Texas limited partnership.
          “Indebtedness” means, with respect to any specified Person, any indebtedness of such Person, whether or not contingent:
            (1) in respect of borrowed money;
 
            (2) evidenced by bonds, notes, debentures or similar instruments or letters of credit (or reimbursement agreements in respect thereof);
 
            (3) in respect of bankers’ acceptances;
 
            (4) representing Capital Lease Obligations;

S-61


Table of Contents

            (5) representing the balance deferred and unpaid of the purchase price of any property, except any such balance that constitutes an accrued expense or trade payable; or
 
            (6) representing any Hedging Obligations,
if and to the extent any of the preceding items (other than letters of credit and Hedging Obligations) would appear as a liability upon a balance sheet of the specified Person prepared in accordance with GAAP. In addition, the term “Indebtedness” includes all Indebtedness of others secured by a Lien on any asset of the specified Person (whether or not such Indebtedness is assumed by the specified Person) and, to the extent not otherwise included, the guarantee by the specified Person of any Indebtedness of any other Person (including, with respect to any Production Payment, any warranties or guarantees of production or payment by such Person with respect to such Production Payment, but excluding other contractual obligations of such Person with respect to such Production Payment). Subject to the preceding sentence, neither Dollar-Denominated Production Payments nor Volumetric Production Payments shall be deemed to be Indebtedness.
          The amount of any Indebtedness outstanding as of any date will be:
            (1) the accreted value of the Indebtedness, in the case of any Indebtedness issued with original issue discount;
 
            (2) in the case of any Hedging Obligation, the termination value of the agreement or arrangement giving rise to such Hedging Obligation that would be payable by such Person at such date; and
 
            (3) the principal amount of the Indebtedness, together with any interest on the Indebtedness that is more than 30 days past due, in the case of any other Indebtedness.
          “Investments” means, with respect to any Person, all direct or indirect investments by such Person in other Persons (including Affiliates) in the forms of loans (including guarantees or other obligations), advances or capital contributions (excluding commission, travel and similar advances to officers and employees made in the ordinary course of business), purchases or other acquisitions for consideration of Indebtedness, Equity Interests or other securities, together with all items that are or would be classified as investments on a balance sheet prepared in accordance with GAAP. If the Company or any Restricted Subsidiary of the Company sells or otherwise disposes of any Equity Interests of any direct or indirect Restricted Subsidiary of the Company such that, after giving effect to any such sale or disposition, such Person is no longer a Restricted Subsidiary of the Company, the Company will be deemed to have made an Investment on the date of any such sale or disposition in an amount equal to the fair market value of the Equity Interests of such Restricted Subsidiary not sold or disposed of in an amount determined as provided in the final paragraph of the covenant described above under the caption “— Certain Covenants — Restricted Payments.” The acquisition by the Company or any Subsidiary of the Company of a Person that holds an Investment in a third Person will be deemed to be an Investment made by the Company or such Subsidiary in such third Person in an amount equal to the fair market value of the Investment held by the acquired Person in such third Person on the date of any such acquisition in an amount determined as provided in the final paragraph of the covenant described above under the caption “— Certain Covenants — Restricted Payments.”
          “Lien” means, with respect to any asset, any mortgage, lien, pledge, charge, security interest or encumbrance of any kind in respect of such asset, whether or not filed, recorded or otherwise perfected under applicable law, including any conditional sale or other title retention agreement, any lease in the nature thereof, any option or other agreement to sell or give a security interest in and any filing of or agreement to give any financing statement under the Uniform Commercial Code (or equivalent statutes) of any jurisdiction other than a precautionary financing statement not intended as a security agreement.
          “Material Change” means an increase or decrease (excluding changes that result solely from changes in prices and changes resulting from the incurrence of previously estimated future development costs) of more than 25% during a fiscal quarter in the discounted future net revenues from proved crude

S-62


Table of Contents

oil and natural gas reserves of the Company and its Restricted Subsidiaries, calculated in accordance with clause (1)(a) of the definition of ACNTA; provided, however, that the following will be excluded from the calculation of Material Change:
            (1) any acquisitions during the fiscal quarter of oil and gas reserves that have been estimated by independent petroleum engineers and with respect to which a report or reports of such engineers exist; and
 
            (2) any disposition of properties existing at the beginning of such fiscal quarter that have been disposed of in compliance with the covenant described under “— Repurchase of the Option of Holders — Assets Sales.”
          “Material Domestic Subsidiary” means any one Domestic Subsidiary, or any group of two or more Domestic Subsidiaries, that is not a Guarantor at the time of determination and that at such time has either assets or quarterly revenues in excess of 3.0% of the consolidated assets or quarterly revenues of the Company and its Restricted Subsidiaries, in each case based upon the most recent quarterly financial statements available to the Company.
          “Net Income” means, with respect to any specified Person, the net income (loss) of such Person, determined in accordance with GAAP and before any reduction in respect of preferred stock dividends, excluding, however:
            (1) any gain (but not loss), together with any related provision for taxes on such gain (but not loss), realized in connection with: (a) any Asset Sale; or (b) the disposition of any securities by such Person or any of its Subsidiaries or the extinguishment of any Indebtedness of such Person or any of its Subsidiaries; and
 
            (2) any extraordinary gain (but not loss), together with any related provision for taxes on such extraordinary gain (but not loss).
          “Net Proceeds” means the aggregate cash proceeds received by the Company or any of its Restricted Subsidiaries in respect of any Asset Sale (including, without limitation, any cash received upon the sale or other disposition of any non-cash consideration received in any Asset Sale), net of:
            (1) the direct costs relating to such Asset Sale, including, without limitation, legal, accounting and investment banking fees, and sales commissions, and any relocation expenses incurred as a result of the Asset Sale,
 
            (2) taxes paid or payable as a result of the Asset Sale, in each case, after taking into account any available tax credits or deductions and any tax sharing arrangements,
 
            (3) amounts required to be applied to the repayment of Indebtedness, other than under the Credit Facilities, secured by a Lien on the properties or assets that were the subject of such Asset Sale, and
 
            (4) any reserve for adjustment in respect of the sale price of such properties or assets established in accordance with GAAP.
          “Net Working Capital” means:
            (1) all current assets of the Company and its Restricted Subsidiaries, minus
 
            (2) all current liabilities of the Company and its Restricted Subsidiaries, except current liabilities included in Indebtedness;
in each case, on a consolidated basis and determined in accordance with GAAP.
          “Non-Recourse Debt” means Indebtedness:
            (1) as to which neither the Company nor any of its Restricted Subsidiaries (a) provides credit support of any kind (including any undertaking, agreement or instrument that would

S-63


Table of Contents

  constitute Indebtedness), (b) is directly or indirectly liable as a guarantor or otherwise, or (c) is the lender;
 
            (2) no default with respect to which (including any rights that the holders of the Indebtedness may have to take enforcement action against an Unrestricted Subsidiary) would permit upon notice, lapse of time or both any holder of any other Indebtedness (other than the notes) of the Company or any of its Restricted Subsidiaries to declare a default on such other Indebtedness or cause the payment of the Indebtedness to be accelerated or payable prior to its Stated Maturity; and
 
            (3) as to which the lenders have been notified in writing that they will not have any recourse to the stock or assets of the Company or any of its Restricted Subsidiaries.
          “Obligations” means any principal, premium, if any, interest (including interest accruing on or after the filing of any petition in bankruptcy or for reorganization, whether or not a claim for post-filing interest is allowed in such proceeding), penalties, fees, charges, expenses, indemnifications, reimbursement obligations, damages, guarantees, and other liabilities or amounts payable under the documentation governing any Indebtedness or in respect thereto.
          “Oil and Gas Business” means:
            (1) the acquisition, exploration, development, operation and disposition of interests in oil, natural gas and other hydrocarbon properties;
 
            (2) the gathering, marketing, treating, processing (but not refining), storage, selling and transporting of any production from those interests; and
 
            (3) any activity necessary, appropriate or incidental to the activities described above.
          “Permitted Business Investments” means Investments made in the ordinary course of, and of a nature that is or shall have become customary in, the Oil and Gas Business, including through agreements, transactions, interests or arrangements that permit one to share risk or costs, comply with regulatory requirements regarding local ownership or satisfy other objectives customarily achieved through the conduct of the Oil and Gas Business jointly with third parties, including without limitation:
            (1) direct or indirect ownership of crude oil, natural gas, other related hydrocarbon and mineral properties or any interest therein or gathering, transportation, processing, storage or related systems; and
 
            (2) the entry into operating agreements, joint ventures, processing agreements, working interests, royalty interests, mineral leases, farm-in agreements, farm-out agreements, development agreements, production sharing agreements, area of mutual interest agreements, contracts for the sale, transportation or exchange of crude oil and natural gas and related hydrocarbons and minerals, unitization agreements, pooling arrangements, joint bidding agreements, service contracts, partnership agreements (whether general or limited), or other similar or customary agreements, transactions, properties, interests or arrangements and Investments and expenditures in connection therewith or pursuant thereto, in each case made or entered into in the ordinary course of the Oil and Gas Business, excluding, however, Investments in corporations and publicly-traded limited partnerships.
          “Permitted Investments” means:
            (1) any Investment in the Company or in a Restricted Subsidiary of the Company;
 
            (2) any Investment in Cash Equivalents;

S-64


Table of Contents

            (3) any Investment by the Company or any Restricted Subsidiary of the Company in a Person, if as a result of such Investment:
            (a) such Person becomes a Restricted Subsidiary of the Company; or
 
            (b) such Person is merged, consolidated or amalgamated with or into, or transfers or conveys substantially all of its properties or assets to, or is liquidated into, the Company or a Restricted Subsidiary of the Company;
            (4) any Investment made as a result of the receipt of non-cash consideration from an Asset Sale that was made pursuant to and in compliance with the covenant described above under the caption “— Repurchase at the Option of Holders — Asset Sales;”
 
            (5) any Investment in any Person solely in exchange for the issuance of Equity Interests (other than Disqualified Stock) of the Company;
 
            (6) any Investments received in compromise of obligations of trade creditors or customers that were incurred in the ordinary course of business, including pursuant to any plan of reorganization or similar arrangement upon the bankruptcy or insolvency of any trade creditor or customer;
 
            (7) Hedging Obligations permitted to be incurred under the “Incurrence of Indebtedness and Issuance of Preferred Stock” covenant;
 
            (8) Permitted Business Investments; and
 
            (9) other Investments in any Person having an aggregate fair market value (measured on the date each such Investment was made and without giving effect to subsequent changes in value), when taken together with all other Investments made pursuant to this clause (9) that are at the time outstanding, not to exceed the greater of $20.0 million and 2.5% of ACNTA.
          “Permitted Junior Securities” means:
            (1) Equity Interests in the Company or any Guarantor; or
 
            (2) debt securities that are subordinated to all Senior Debt and any debt securities issued in exchange for Senior Debt to substantially the same extent as, or to a greater extent than, the notes and the Subsidiary Guarantees are subordinated to Senior Debt pursuant to the indenture.
          “Permitted Liens” means:
            (1) Liens securing any Indebtedness under any of the Credit Facilities or any other Senior Debt;
 
            (2) Liens in favor of the Company or the Guarantors;
 
            (3) Liens on property of a Person existing at the time such Person is merged with or into or consolidated with the Company or any Restricted Subsidiary of the Company, provided that such Liens were in existence prior to the contemplation of such merger or consolidation and do not extend to any assets other than those of the Person merged into or consolidated with the Company or the Restricted Subsidiary;
 
            (4) Liens on property existing at the time of acquisition of the property by the Company or any Restricted Subsidiary of the Company, provided that such Liens were in existence prior to the contemplation of such acquisition;
 
            (5) Liens to secure Indebtedness (including Capital Lease Obligations) permitted by clause (4) of the second paragraph of the covenant entitled “— Certain Covenants — Incurrence of Indebtedness and Issuance of Preferred Stock” covering only the assets acquired with such Indebtedness and proceeds and products thereof;
 
            (6) Liens existing on the date of the indenture; and

S-65


Table of Contents

            (7) Liens incurred in the ordinary course of business of the Company or any Restricted Subsidiary of the Company with respect to obligations that do not exceed $10.0 million at any one time outstanding.
          “Permitted Refinancing Indebtedness” means any Indebtedness of the Company or any of its Restricted Subsidiaries issued in exchange for, or the net proceeds of which are used to extend, refinance, renew, replace, defease or refund other Indebtedness of the Company or any of its Restricted Subsidiaries (other than intercompany Indebtedness); provided that:
            (1) the principal amount (or accreted value, if applicable) of such Permitted Refinancing Indebtedness does not exceed the principal amount (or accreted value, if applicable) of the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded (plus all accrued interest on the Indebtedness and the amount of all expenses and premiums incurred in connection therewith);
 
            (2) such Permitted Refinancing Indebtedness has a final maturity date later than the final maturity date of, and has a Weighted Average Life to Maturity equal to or greater than the Weighted Average Life to Maturity of, the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded;
 
            (3) if the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded is subordinated in right of payment to the notes or the Subsidiary Guarantees, such Permitted Refinancing Indebtedness is subordinated in right of payment to the notes or the Subsidiary Guarantees on terms at least as favorable to the Holders of notes as those contained in the documentation governing the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded; and
 
            (4) such Indebtedness is not incurred by a Restricted Subsidiary of the Company if the Company is the obligor on the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded; provided, however, that a Restricted Subsidiary that is also a Guarantor may guarantee Permitted Refinancing Indebtedness incurred by the Company, whether or not such Restricted Subsidiary was an obligor or guarantor of the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded.
          Notwithstanding the preceding, any Indebtedness incurred under Credit Facilities pursuant to the covenant “Incurrence of Indebtedness and Issuance of Preferred Stock” shall be subject only to the refinancing provision in the definition of Credit Facilities and not pursuant to the requirements set forth in the definition of Permitted Refinancing Indebtedness.
          “Person” means any individual, corporation, partnership, joint venture, association, joint-stock company, trust, unincorporated organization, limited liability company or government or other entity.
          “Production Payments” means, collectively, Dollar-Denominated Production Payments and Volumetric Production Payments.
          “Restricted Investment” means an Investment other than a Permitted Investment.
          “Restricted Subsidiary” of a Person means any Subsidiary of the referent Person that is not an Unrestricted Subsidiary.
          “Senior Debt” means
            (1) all Indebtedness of the Company or any of its Restricted Subsidiaries outstanding under Credit Facilities and all Hedging Obligations with respect thereto;
 
            (2) any other Indebtedness of the Company or any of its Restricted Subsidiaries permitted to be incurred under the terms of the indenture, unless the instrument under which such Indebtedness is incurred expressly provides that it is on a parity with or subordinated in right of payment to the notes or any Subsidiary Guarantee; and

S-66


Table of Contents

            (3) all Obligations with respect to the items listed in the preceding clauses (1) and (2).
          Notwithstanding anything to the contrary in the preceding sentence, Senior Debt will not include:
            (a) any intercompany Indebtedness of the Company or any of its Subsidiaries to the Company or any of its Affiliates;
 
            (b) the 2012 Notes; or
 
            (c) any Indebtedness that is incurred in violation of the indenture.
For the avoidance of doubt, “Senior Debt” will not include any trade payables or taxes owed or owing by the Company or any Restricted Subsidiary.
          “Significant Subsidiary” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated pursuant to the Securities Act, as such Regulation is in effect on the date of the indenture.
          “Stated Maturity” means, with respect to any installment of interest or principal on any series of Indebtedness, the date on which the payment of interest or principal was scheduled to be paid in the original documentation governing such Indebtedness, and will not include any contingent obligations to repay, redeem or repurchase any such interest or principal prior to the date originally scheduled for the payment thereof.
          “Subsidiary” means, with respect to any specified Person:
            (1) any corporation, association or other business entity (other than a partnership) of which more than 50% of the total voting power of Voting Stock is at the time owned or controlled, directly or through another Subsidiary, by that Person or one or more of the other Subsidiaries of that Person (or a combination thereof); and
 
            (2) any partnership (a) the sole general partner or the managing general partner of which is such Person or a Subsidiary of such Person or (b) the only general partners of which are that Person or one or more Subsidiaries of that Person (or any combination thereof), but only if such Person and its Subsidiaries are entitled to receive more than 20% of the assets of such partnership upon its dissolution.
          “Subsidiary Guarantee” means any guarantee by a Guarantor of the Company’s payment Obligations under the indenture and on the notes.
          “2012 Notes” means the Company’s 71/4% Senior Subordinated Notes due 2012.
          “Unrestricted Subsidiary” means any Subsidiary of the Company (other than Whiting) that is designated by the Board of Directors as an Unrestricted Subsidiary pursuant to a Board Resolution, but only to the extent that such Subsidiary:
            (1) has no Indebtedness other than Non-Recourse Debt;
 
            (2) is not party to any agreement, contract, arrangement or understanding with the Company or any Restricted Subsidiary of the Company unless the terms of any such agreement, contract, arrangement or understanding are no less favorable to the Company or such Restricted Subsidiary than those that might be obtained at the time from Persons who are not Affiliates of the Company;
 
            (3) is a Person with respect to which neither the Company nor any of its Restricted Subsidiaries has any direct or indirect obligation (a) to subscribe for additional Equity Interests or (b) to maintain or preserve such Person’s financial condition or to cause such Person to achieve any specified levels of operating results; and
 
            (4) has not guaranteed or otherwise directly or indirectly provided credit support for any Indebtedness of the Company or any of its Restricted Subsidiaries.

S-67


Table of Contents

          Any designation of a Subsidiary of the Company as an Unrestricted Subsidiary will be evidenced to the trustee by filing with the trustee the Board Resolution giving effect to such designation and an officers’ certificate certifying that such designation complied with the preceding conditions and was permitted by the covenant described above under the caption “— Certain Covenants — Restricted Payments.” If, at any time, any Unrestricted Subsidiary would fail to meet the preceding requirements as an Unrestricted Subsidiary, it will thereafter cease to be an Unrestricted Subsidiary for purposes of the indenture and any Indebtedness of such Subsidiary will be deemed to be incurred by a Restricted Subsidiary of the Company as of such date and, if such Indebtedness is not permitted to be incurred as of such date under the covenant described under the caption “— Certain Covenants — Incurrence of Indebtedness and Issuance of Preferred Stock,” the Company will be in default of such covenant.
          “Volumetric Production Payments” means production payment obligations recorded as deferred revenue in accordance with GAAP, together with all related undertakings and obligations.
          “Voting Stock” of any Person as of any date means the Capital Stock of such Person that is at the time entitled (without regard to the occurrence of any contingency) to vote in the election of the Board of Directors of such Person.
          “Weighted Average Life to Maturity” means, when applied to any Indebtedness at any date, the number of years obtained by dividing:
            (1) the sum of the products obtained by multiplying (a) the amount of each then remaining installment, sinking fund, serial maturity or other required payments of principal, including payment at final maturity, in respect of the Indebtedness, by (b) the number of years (calculated to the nearest one-twelfth) that will elapse between such date and the making of such payment; by
 
            (2) the then outstanding principal amount of such Indebtedness.

S-68


Table of Contents

UNDERWRITING
          We intend to offer the notes through the underwriters. Merrill Lynch, Pierce, Fenner & Smith Incorporated and Lehman Brothers Inc. are acting as the representatives of the underwriters named below. Subject to the terms and conditions described in a purchase agreement among us and the underwriters, we have agreed to sell to the underwriters, and the underwriters severally have agreed to purchase from us, the principal amount of the notes listed opposite their names below.
         
    Principal
Underwriters   Amount
     
Merrill Lynch, Pierce, Fenner & Smith
Incorporated
  $    
Lehman Brothers Inc. 
       
Banc of America Securities LLC
       
J.P. Morgan Securities Inc. 
       
Wachovia Capital Markets, LLC
       
A.G. Edwards & Sons, Inc. 
       
KeyBanc Capital Markets, a Division of McDonald Investments Inc. 
       
Petrie Parkman & Co., Inc. 
       
Raymond James & Associates, Inc. 
       
       
             Total
  $ 220,000,000  
       
          The underwriters have agreed to purchase all of the notes sold under the purchase agreement if any of these notes are purchased. If an underwriter defaults, the purchase agreement provides that the purchase commitments of the nondefaulting underwriters may be increased or the purchase agreement may be terminated.
          We have agreed to indemnify the underwriters against certain liabilities, including liabilities under the Securities Act, or to contribute to payments the underwriters may be required to make in respect of those liabilities.
          The underwriters are offering the notes, subject to prior sale, when, as and if issued to and accepted by them, subject to approval of legal matters by their counsel, including the validity of the notes, and other conditions contained in the purchase agreement, such as the receipt by the underwriters of officers’ certificates and legal opinions. The underwriters reserve the right to withdraw, cancel or modify offers to the public and to reject orders in whole or part.
Commissions and Discounts
          The representatives have advised us that the underwriters propose initially to offer the notes to the public at the public offering price on the cover page of this prospectus supplement and to dealers at that price less a concession not in excess of           % of the principal amount of the notes. The underwriters may allow, and the dealers may reallow, a discount not in excess of           % of the principal amount of the notes to other dealers. After the initial public offering, the public offering price, concession and discount may be changed.
          The expenses of the offering, not including the underwriting discount, are estimated at $290,000 and are payable by us.

S-69


Table of Contents

No Sale of Similar Securities
          We have agreed, with exceptions, not to sell or transfer any debt securities (other than the notes) for 90 days after the date of this prospectus supplement without first obtaining the written consent of Merrill Lynch. Specifically, we have agreed not to directly or indirectly:
         • offer, pledge, sell, or contract to sell any debt securities,
 
         • sell any option or contract to purchase any debt securities,
 
         • purchase any option or contract to sell any debt securities,
 
         • grant any option, right or warrant for the sale of any debt securities,
 
         • file a registration statement for any debt securities other than the notes, or
 
         • lend or otherwise dispose of or transfer any debt securities.
          This lockup provision applies to debt securities or any securities convertible into or exercisable or exchangeable for debt securities.
New Issue of Notes
          The notes are a new issue of securities with no established trading market. We do not intend to apply for listing of the notes on any national securities exchange or for quotation of the notes on any automated dealer quotation system. The underwriters have advised us that they presently intend to make a market in the notes after completion of this offering. However, they are under no obligation to do so and may discontinue any market-making activities at any time without any notice. We cannot assure the liquidity of the trading market for the notes or that an active public market for the notes will develop. If an active public trading market for the notes does not develop, the market price and liquidity of the notes may be adversely affected.
Price Stabilization and Short Positions
          In connection with the offering, the underwriters may engage in transactions that stabilize the market price of the notes. Such transactions consist of bids or purchases to peg, fix or maintain the price of the notes. If the underwriters create a short position in the notes in connection with the offering, i.e., if they sell more notes than are listed on the cover page of this prospectus supplement, then the underwriters may reduce that short position by purchasing notes in the open market. Purchases of a security to stabilize the price or to reduce a short position may cause the price of the security to be higher than it might be in the absence of such purchases.
          Neither we nor any of the underwriters makes any representation or prediction as to the direction or magnitude of any effect that the transactions describe above may have on the price of the notes. In addition, neither we nor any of the underwriters makes any representation that the underwriters will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.
Electronic Distribution
          Merrill Lynch will be facilitating Internet distribution for this offering to certain of its Internet subscription customers. Merrill Lynch intends to allocate a limited principal amount of the notes for sale to its online brokerage customers. An electronic prospectus supplement is available on the Internet Web site maintained by Merrill Lynch.
          A prospectus supplement in electronic format may be made available on the Internet sites or through other online services maintained by one or more of the other underwriters and/or selling group members participating in this offering, or by their affiliates. In those cases, prospective investors may view offering terms online and, depending upon the particular underwriter or selling group member, prospective investors may be allowed to place orders online. Certain underwriters may agree with us to allocate a

S-70


Table of Contents

specific principal amount of the notes for sale to online brokerage account holders. Any such allocation for online distributions will be made by the underwriters on the same basis as other allocations.
          Other than the prospectus supplement in electronic format, the information on any underwriter’s or selling group member’s web site and any information contained in any other web site maintained by an underwriter or selling group member is not part of the registration statement of which this prospectus supplement and the accompanying prospectus forms a part, has not been approved and/or endorsed by us or any underwriter or selling group member in its capacity as underwriter or selling group member and should not be relied upon by investors.
Other Relationships
          Some of the underwriters and their affiliates have engaged in, and may in the future engage in, investment banking, commercial banking and other commercial dealings with us in the ordinary course of business. In addition, the trustee for the notes is an affiliate of J.P. Morgan Securities Inc. Affiliates of Banc of America Securities LLC, J.P. Morgan Securities Inc., KeyBanc Capital Markets, a Division of McDonald Investments Inc. and Wachovia Capital Markets, LLC are lenders under Whiting Oil and Gas Corporation’s bank credit facility and each will receive its proportionate share of the net proceeds of the offering used to repay a portion of the outstanding balance under the credit facility.

S-71


Table of Contents

LEGAL MATTERS
          Certain legal matters relating to this offering will be passed upon for us by the law firm of Foley & Lardner LLP. Welborn Sullivan Meck & Tooley, P.C. will pass on certain legal matters for us relating to us and our subsidiaries in connection with this offering. Certain legal matters relating to this offering will be passed upon for the underwriters by the law firm of Vinson & Elkins L.L.P.
EXPERTS
          The financial statements, the related financial statement schedule, and management’s report on the effectiveness of internal control over financial reporting incorporated in this prospectus supplement and the accompanying prospectus by reference from Whiting Petroleum Corporation’s Annual Report on Form 10-K for the year ended December 31, 2004 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference (which report expresses an unqualified opinion and contains an explanatory paragraph that describes a change in the method of accounting for asset retirement obligations effective January 1, 2003), and have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.
          Certain information with respect to our oil and natural gas reserves derived from the reports of Cawley Gillespie & Associates, Inc., R.A. Lenser & Associates, Inc. and Ryder Scott Company, L.P., each independent petroleum engineering consultants, has been incorporated in this prospectus supplement and the accompanying prospectus by reference from Whiting Petroleum Corporation’s Annual Report on Form 10-K for the year ended December 31, 2004 on the authority of said firms as experts in petroleum engineering.

S-72


Table of Contents

PROSPECTUS
(WHITING LOGO)
$500,000,000
 
Whiting Petroleum Corporation
Debt Securities
Common Stock
Preferred Stock
Warrants
Stock Purchase Contracts
Stock Purchase Units
 
          We may offer and sell from time to time up to an aggregate initial offering price of $500,000,000 of our securities in one or more classes or series and in amounts, at prices and on terms that we will determine at the times of the offerings. Our subsidiaries may guarantee any debt securities that we issue under this prospectus.
          We will provide specific terms of the securities, including the offering prices, in one or more supplements to this prospectus. The supplements may also add, update or change information contained in this prospectus. You should read this prospectus and the prospectus supplement relating to the specific issue of securities carefully before you invest.
          Our common stock is listed on the New York Stock Exchange under the symbol “WLL.”
 
          Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
 
The date of this prospectus is January 14, 2005.


Table of Contents

TABLE OF CONTENTS
         
    Page
     
    2  
    3  
    3  
    4  
    4  
    5  
    17  
    20  
    21  
    22  
    25  
    26  
    26  
ABOUT THIS PROSPECTUS
          In this prospectus, “we,” “us,” “our” or “ours” refer to Whiting Petroleum Corporation.
          This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, or SEC, utilizing a “shelf” registration process. Under this shelf process, we may, from time to time, sell the securities or combinations of the securities described in this prospectus in one or more offerings with a maximum aggregate offering price of up to $500,000,000. This prospectus provides you with a general description of the securities that we may offer. Each time we offer securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with additional information described under the heading “Where You Can Find More Information.”
          You should rely only on the information contained or incorporated by reference in this prospectus and in any prospectus supplement. We have not authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not making offers to sell or solicitations to buy the securities in any jurisdiction in which an offer or solicitation is not authorized or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation. You should not assume that the information in this prospectus or any prospectus supplement, as well as the information we previously filed with the SEC that we incorporate by reference in this prospectus or any prospectus supplement, is accurate as of any date other than its respective date. Our business, financial condition, results of operations and prospects may have changed since those dates.

2


Table of Contents

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
          This prospectus and the documents incorporated by reference contain statements that we believe to be “forward looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than historical facts, including, without limitation, statements regarding our future financial position, business strategy, projected revenues, earnings, costs, capital expenditures and debt levels, and plans and objectives of management for future operations, are forward looking statements. When used in this prospectus, words such as we “expect,” “intend,” “plan,” “estimate,” “anticipate,” “believe” or “should” or the negative thereof or variations thereon or similar terminology are generally intended to identify forward looking statements. Such forward looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those expressed in, or implied by, such statements. Some, but not all, of the risks and uncertainties include:
         • declines in oil or natural gas prices;
 
         • our level of success in exploitation, exploration, development and production activities;
 
         • our ability to obtain external capital to finance acquisitions;
 
         • our ability to identify and complete acquisitions and to successfully integrate acquired businesses, including our ability to realize cost savings from completed acquisitions;
 
         • unforeseen underperformance of or liabilities associated with acquired properties;
 
         • inaccuracies of our reserve estimates or our assumptions underlying them;
 
         • failure of our properties to yield oil or natural gas in commercially viable quantities;
 
         • uninsured or underinsured losses resulting from our oil and natural gas operations;
 
         • our inability to access oil and natural gas markets due to market conditions or operational impediments;
 
         • the impact and costs of compliance with laws and regulations governing our oil and natural gas operations;
 
         • risks related to our level of indebtedness;
 
         • our ability to replace our oil and natural gas reserves;
 
         • any loss of our senior management or technical personnel;
 
         • competition in the oil and natural gas industry;
 
         • risks arising out of our hedging transactions; and
 
         • other risks described in documents we incorporate by reference.
          We assume no obligation, and disclaim any duty, to update the forward looking statements in this prospectus or in the documents we incorporate by reference.
WHITING PETROLEUM CORPORATION
          We are engaged in oil and natural gas exploitation, acquisition, exploration and production activities primarily in the Permian Basin, Rocky Mountains, Gulf Coast, Michigan, Mid-Continent and California regions of the United States. Our focus is on pursuing growth projects that we believe will generate attractive rates of return and maintaining a balanced portfolio of lower risk, long-lived oil and natural gas properties that provide stable cash flows. Since our inception in 1980, we have built a strong asset base and achieved steady growth through both property acquisitions and exploitation activities.
          Our principal executive offices are located at 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, and our telephone number is (303) 837-1661.

3


Table of Contents

USE OF PROCEEDS
          Unless we otherwise specify in the applicable prospectus supplement, we expect to use the net proceeds from the sale of the securities for general corporate purposes, which may include reduction or refinancing of debt or other corporate obligations, the financing of capital expenditures, acquisitions and additions to our working capital. Until we use the net proceeds from the sale of the securities for these purposes, we may place the net proceeds in temporary investments.
RATIO OF EARNINGS TO FIXED CHARGES
          The following table presents our ratios of consolidated earnings to fixed charges for the periods presented.
                                                 
    Nine Months    
    Ended   Years Ended December 31,
    September 30,    
    2004   2003   2002   2001   2000   1999
                         
Ratio of earnings to fixed charges(1)
    7.27x       4.85x       2.08x       6.10x       6.93x       3.32x  
 
(1)  For purposes of calculating the ratios of consolidated earnings to fixed charges, earnings consist of income before income taxes, fixed charges and amortization of capitalized interest, less capitalized interest. Fixed charges consist of interest expensed, interest capitalized, amortized premiums, discounts and capitalized expenses related to indebtedness and an estimate of interest within rental expense.
          We did not have any preferred stock outstanding and we did not pay or accrue any preferred stock dividends during the periods presented above.

4


Table of Contents

DESCRIPTION OF DEBT SECURITIES
          This section describes the general terms and provisions of the debt securities that we may issue separately, upon exercise of a debt warrant, in connection with a stock purchase contract or as part of a stock purchase unit from time to time in the form of one or more series of debt securities. The applicable prospectus supplement will describe the specific terms of the debt securities offered through that prospectus supplement as well as any general terms described in this section that will not apply to those debt securities.
          Any debt securities issued using this prospectus (“Debt Securities”) will be our direct unsecured general obligations. The Debt Securities will be either our senior debt securities (“Senior Debt Securities”) or our subordinated debt securities (“Subordinated Debt Securities”). The Senior Debt Securities and the Subordinated Debt Securities will be issued under separate Indentures among us, certain of our domestic subsidiaries, if our domestic subsidiaries are guarantors of the Debt Securities, and a U.S. banking institution (a “Trustee”). The Trustee for each series of Debt Securities will be identified in the applicable prospectus supplement. Senior Debt Securities will be issued under a “Senior Indenture” and Subordinated Debt Securities will be issued under a “Subordinated Indenture.” Together, the Senior Indenture and the Subordinated Indenture are called “Indentures.”
          We are a holding company, and we primarily conduct our operations through subsidiaries. Unless the Debt Securities are guaranteed by our subsidiaries as described below, the rights of our company and our creditors, including holders of the Debt Securities, to participate in the assets of any subsidiary upon the latter’s liquidation or reorganization, will be subject to the prior claims of the subsidiary’s creditors, except to the extent that we may ourself be a creditor with recognized claims against such subsidiary.
          We have summarized selected provisions of the Indentures below. The summary is not complete. The form of each Indenture has been filed with the SEC as an exhibit to the registration statement of which this prospectus is a part, and you should read the Indentures for provisions that may be important to you. In the summary below we have included references to article or section numbers of the applicable Indenture so that you can easily locate these provisions. Whenever we refer in this prospectus or in the prospectus supplement to particular article or sections or defined terms of the Indentures, those article or sections or defined terms are incorporated by reference herein or therein, as applicable. Capitalized terms used in the summary have the meanings specified in the Indentures.
General
          The Indentures provide that Debt Securities in separate series may be issued thereunder from time to time without limitation as to aggregate principal amount. We may specify a maximum aggregate principal amount for the Debt Securities of any series (Section 301). We will determine the terms and conditions of the Debt Securities, including the maturity, principal and interest, but those terms must be consistent with the Indenture.
          The Senior Debt Securities will rank equally with all of our other senior unsecured and unsubordinated debt (“Senior Debt”). The Subordinated Debt Securities will be subordinated in right of payment to the prior payment in full of all of our Senior Debt (as defined) as described under “— Subordination of Subordinated Debt Securities” and in the prospectus supplement applicable to any Subordinated Debt Securities.
          If specified in the prospectus supplement, certain of our domestic subsidiaries (the “Subsidiary Guarantors”) will fully and unconditionally guarantee (the “Subsidiary Guarantees”) on a joint and several basis the Debt Securities as described under “— Subsidiary Guarantees” and in the prospectus supplement. The Subsidiary Guarantees will be unsecured obligations of each Subsidiary Guarantor. Subsidiary Guarantees of Subordinated Debt Securities will be subordinated to the Senior Debt of the Subsidiary Guarantors on the same basis as the Subordinated Debt Securities are subordinated to our Senior Debt (Article Thirteen).

5


Table of Contents

          The applicable prospectus supplement will set forth the price or prices at which the Debt Securities to be offered will be issued and will describe the following terms of such Debt Securities:
            (1) the title of the Debt Securities;
 
            (2) whether the Debt Securities are Senior Debt Securities or Subordinated Debt Securities and, if Subordinated Debt Securities, the related subordination terms;
 
            (3) whether any of the Subsidiary Guarantors will provide Subsidiary Guarantees of the Debt Securities;
 
            (4) any limit on the aggregate principal amount of the Debt Securities;
 
            (5) the dates on which the principal of the Debt Securities will be payable;
 
            (6) the interest rate that the Debt Securities will bear and the interest payment dates for the Debt Securities;
 
            (7) the places where payments on the Debt Securities will be payable;
 
            (8) any terms upon which the Debt Securities may be redeemed, in whole or in part, at our option;
 
            (9) any sinking fund or other provisions that would obligate us to repurchase or otherwise redeem the Debt Securities;
 
            (10) the portion of the principal amount, if less than all, of the Debt Securities that will be payable upon declaration of acceleration of the Maturity of the Debt Securities;
 
            (11) whether the Debt Securities are defeasible;
 
            (12) any addition to or change in the Events of Default;
 
            (13) whether the Debt Securities are convertible into our common stock and, if so, the terms and conditions upon which conversion will be effected, including the initial conversion price or conversion rate and any adjustments thereto and the conversion period;
 
            (14) if convertible into our common stock or any of our other securities, the terms on which such Debt Securities are convertible;
 
            (15) any addition to or change in the covenants in the Indenture applicable to the Debt Securities; and
 
            (16) any other terms of the Debt Securities not inconsistent with the provisions of the Indenture (Section 301).
          The Indentures do not limit the amount of Debt Securities that may be issued. Each Indenture allows Debt Securities to be issued up to the principal amount that may be authorized by our company and may be in any currency or currency unit designated by us.
          Debt Securities, including Original Issue Discount Securities, may be sold at a substantial discount below their principal amount. Special United States federal income tax considerations applicable to Debt Securities sold at an original issue discount may be described in the applicable prospectus supplement. In addition, special United States federal income tax or other considerations applicable to any Debt Securities that are denominated in a currency or currency unit other than United States dollars may be described in the applicable prospectus supplement.
Senior Debt Securities
          The Senior Debt Securities will be unsecured senior obligations and will rank equally with all other senior unsecured and unsubordinated debt. The Senior Debt Securities will, however, be subordinated in right of payment to all our secured indebtedness to the extent of the value of the assets

6


Table of Contents

securing such indebtedness. Except as provided in the applicable Senior Indenture or specified in any authorizing resolution or supplemental indenture relating to a series of Senior Debt Securities to be issued, no Senior Indenture will limit the amount of additional indebtedness that may rank equally with the Senior Debt Securities or the amount of indebtedness, secured or otherwise, that may be incurred or preferred stock that may be issued by any of our subsidiaries.
Subordination of Subordinated Debt Securities
          The indebtedness evidenced by the Subordinated Debt Securities will, to the extent set forth in the Subordinated Indenture with respect to each series of Subordinated Debt Securities, be subordinate in right of payment to the prior payment in full of all of our Senior Debt, including the Senior Debt Securities, and it may also be senior in right of payment to all of our Subordinated Debt (Article Twelve of the Subordinated Indenture). The prospectus supplement relating to any Subordinated Debt Securities will summarize the subordination provisions of the Subordinated Indenture applicable to that series including:
         • the applicability and effect of such provisions upon any payment or distribution respecting that series following any liquidation, dissolution or other winding-up, or any assignment for the benefit of creditors or other marshaling of assets or any bankruptcy, insolvency or similar proceedings;
 
         • the applicability and effect of such provisions in the event of specified defaults with respect to any Senior Debt, including the circumstances under which and the periods in which we will be prohibited from making payments on the Subordinated Debt Securities; and
 
         • the definition of Senior Debt applicable to the Subordinated Debt Securities of that series and, if the series is issued on a senior subordinated basis, the definition of Subordinated Debt applicable to that series.
          The prospectus supplement will also describe as of a recent date the approximate amount of Senior Debt to which the Subordinated Debt Securities of that series will be subordinated.
          The failure to make any payment on any of the Subordinated Debt Securities by reason of the subordination provisions of the Subordinated Indenture described in the prospectus supplement will not be construed as preventing the occurrence of an Event of Default with respect to the Subordinated Debt Securities arising from any such failure to make payment.
          The subordination provisions described above will not be applicable to payments in respect of the Subordinated Debt Securities from a defeasance trust established in connection with any legal defeasance or covenant defeasance of the Subordinated Debt Securities as described under “— Legal Defeasance and Covenant Defeasance.”
Subsidiary Guarantees
          If specified in the prospectus supplement, the Subsidiary Guarantors will guarantee the Debt Securities of a series. Unless otherwise indicated in the prospectus supplement, the following provisions will apply to the Subsidiary Guarantees of the Subsidiary Guarantors.
          Subject to the limitations described below and in the prospectus supplement, the Subsidiary Guarantors will, jointly and severally, fully and unconditionally guarantee the prompt payment when due, whether at Stated Maturity, by acceleration or otherwise, of all our payment obligations under the Indentures and the Debt Securities of a series, whether for principal of, premium, if any, or interest on the Debt Securities or otherwise (all such obligations guaranteed by a Subsidiary Guarantor being herein called the “Guaranteed Obligations”). The Subsidiary Guarantors will also pay all expenses (including reasonable counsel fees and expenses) incurred by the applicable Trustee in enforcing any rights under a Subsidiary Guarantee with respect to a Subsidiary Guarantor (Section 1302).

7


Table of Contents

          In the case of Subordinated Debt Securities, a Subsidiary Guarantor’s Subsidiary Guarantee will be subordinated in right of payment to the Senior Debt of such Subsidiary Guarantor on the same basis as the Subordinated Debt Securities are subordinated to our Senior Debt. No payment will be made by any Subsidiary Guarantor under its Subsidiary Guarantee during any period in which payments by us on the Subordinated Debt Securities are suspended by the subordination provisions of the Subordinated Indenture (Article Fourteen of the Subordinated Indenture).
          Each Subsidiary Guarantee will be limited in amount to an amount not to exceed the maximum amount that can be guaranteed by the relevant Subsidiary Guarantor without rendering such Subsidiary Guarantee voidable under applicable law relating to fraudulent conveyance or fraudulent transfer or similar laws affecting the rights of creditors generally (Section 1306).
          Each Subsidiary Guarantee will be a continuing guarantee and will:
            (1)     remain in full force and effect until either (a) payment in full of all the applicable Debt Securities (or such Debt Securities are otherwise satisfied and discharged in accordance with the provisions of the applicable Indenture) or (b) released as described in the following paragraph;
 
            (2)     be binding upon each Subsidiary Guarantor; and
 
            (3)     inure to the benefit of and be enforceable by the applicable Trustee, the Holders and their successors, transferees and assigns.
          In the event that a Subsidiary Guarantor ceases to be a Subsidiary, either legal defeasance or covenant defeasance occurs with respect to the series or all or substantially all of the assets or all of the Capital Stock of such Subsidiary Guarantor is sold, including by way of sale, merger, consolidation or otherwise, such Subsidiary Guarantor will be released and discharged of its obligations under its Subsidiary Guarantee without any further action required on the part of the Trustee or any Holder, and no other person acquiring or owning the assets or Capital Stock of such Subsidiary Guarantor will be required to enter into a Subsidiary Guarantee (Section 1304). In addition, the prospectus supplement may specify additional circumstances under which a Subsidiary Guarantor can be released from its Subsidiary Guarantee.
Conversion Rights
          The Debt Securities may be converted into other securities of our company, if at all, according to the terms and conditions of an applicable prospectus supplement. Such terms will include the conversion price, the conversion period, provisions as to whether conversion will be at the option of the holders of such series of Debt Securities or at the option of our company, the events requiring an adjustment of the conversion price and provisions affecting conversion in the event of the redemption of such series of Debt Securities.
Form, Exchange and Transfer
          The Debt Securities of each series will be issuable only in fully registered form, without coupons, and, unless otherwise specified in the applicable prospectus supplement, only in denominations of $1,000 and integral multiples thereof (Section 302).
          At the option of the Holder, subject to the terms of the applicable Indenture and the limitations applicable to Global Securities, Debt Securities of each series will be exchangeable for other Debt Securities of the same series of any authorized denomination and of a like tenor and aggregate principal amount (Section 305).
          Subject to the terms of the applicable Indenture and the limitations applicable to Global Securities, Debt Securities may be presented for exchange as provided above or for registration of transfer (duly endorsed or with the form of transfer endorsed thereon duly executed) at the office of the Security Registrar or at the office of any transfer agent designated by us for such purpose. No service charge will be

8


Table of Contents

made for any registration of transfer or exchange of Debt Securities, but we may require payment of a sum sufficient to cover any tax or other governmental charge payable in that connection. Such transfer or exchange will be effected upon the Security Registrar or such transfer agent, as the case may be, being satisfied with the documents of title and identity of the person making the request. The Security Registrar and any other transfer agent initially designated by us for any Debt Securities will be named in the applicable prospectus supplement (Section 305). We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each Place of Payment for the Debt Securities of each series (Section 1002).
          If the Debt Securities of any series (or of any series and specified tenor) are to be redeemed in part, we will not be required to (1) issue, register the transfer of or exchange any Debt Security of that series (or of that series and specified tenor, as the case may be) during a period beginning at the opening of business 15 days before the day of mailing of a notice of redemption of any such Debt Security that may be selected for redemption and ending at the close of business on the day of such mailing or (2) register the transfer of or exchange any Debt Security so selected for redemption, in whole or in part, except the unredeemed portion of any such Debt Security being redeemed in part (Section 305).
Global Securities
          Some or all of the Debt Securities of any series may be represented, in whole or in part, by one or more Global Securities that will have an aggregate principal amount equal to that of the Debt Securities they represent. Each Global Security will be registered in the name of a Depositary or its nominee identified in the applicable prospectus supplement, will be deposited with such Depositary or nominee or its custodian and will bear a legend regarding the restrictions on exchanges and registration of transfer thereof referred to below and any such other matters as may be provided for pursuant to the applicable Indenture.
          Notwithstanding any provision of the Indentures or any Debt Security described in this prospectus, no Global Security may be exchanged in whole or in part for Debt Securities registered, and no transfer of a Global Security in whole or in part may be registered, in the name of any person other than the Depositary for such Global Security or any nominee of such Depositary unless:
            (1)     the Depositary has notified us that it is unwilling or unable to continue as Depositary for such Global Security or has ceased to be qualified to act as such as required by the applicable Indenture, and in either case we fail to appoint a successor Depositary within 90 days;
 
            (2)     an Event of Default with respect to the Debt Securities represented by such Global Security has occurred and is continuing and the Trustee has received a written request from the Depositary to issue certificated Debt Securities; or
 
            (3)     other circumstances exist, in addition to or in lieu of those described above, as may be described in the applicable prospectus supplement.
          All Debt Securities issued in exchange for a Global Security or any portion thereof will be registered in such names as the Depositary may direct (Sections 205 and 305).
          As long as the Depositary, or its nominee, is the registered holder of a Global Security, the Depositary or such nominee, as the case may be, will be considered the sole owner and Holder of such Global Security and the Debt Securities that it represents for all purposes under the Debt Securities and the applicable Indenture (Section 308). Except in the limited circumstances referred to above, owners of beneficial interests in a Global Security will not be entitled to have such Global Security or any Debt Securities that it represents registered in their names, will not receive or be entitled to receive physical delivery of certificated Debt Securities in exchange for those interests and will not be considered to be the owners or Holders of such Global Security or any Debt Securities that is represents for any purpose under the Debt Securities or the applicable Indenture. All payments on a Global Security will be made to the Depositary or its nominee, as the case may be, as the Holder of the security. The laws of some

9


Table of Contents

jurisdictions require that some purchasers of Debt Securities take physical delivery of such Debt Securities in definitive form. These laws may impair the ability to transfer beneficial interests in a Global Security.
          Ownership of beneficial interests in a Global Security will be limited to institutions that have accounts with the Depositary or its nominee (“participants”) and to persons that may hold beneficial interests through participants. In connection with the issuance of any Global Security, the Depositary will credit, on its book-entry registration and transfer system, the respective principal amounts of Debt Securities represented by the Global Security to the accounts of its participants. Ownership of beneficial interests in a Global Security will be shown only on, and the transfer of those ownership interests will be effected only through, records maintained by the Depositary (with respect to participants’ interests) or any such participant (with respect to interests of persons held by such participants on their behalf). Payments, transfers, exchanges and other matters relating to beneficial interests in a Global Security may be subject to various policies and procedures adopted by the Depositary from time to time. None of us, the Subsidiary Guarantors, any Trustee or the agents of ourself, the Subsidiary Guarantors or any Trustee will have any responsibility or liability for any aspect of the Depositary’s or any participant’s records relating to, or for payments made on account of, beneficial interests in a Global Security, or for maintaining, supervising or reviewing any records relating to such beneficial interests.
Payment and Paying Agents
          Unless otherwise indicated in the applicable prospectus supplement, payment of interest on a Debt Security on any Interest Payment Date will be made to the Person in whose name such Debt Security (or one or more Predecessor Debt Securities) is registered at the close of business on the Regular Record Date for such interest (Section 307).
          Unless otherwise indicated in the applicable prospectus supplement, principal of and any premium and interest on the Debt Securities of a particular series will be payable at the office of such Paying Agent or Paying Agents as we may designate for such purpose from time to time, except that at our option payment of any interest on Debt Securities in certificated form may be made by check mailed to the address of the Person entitled thereto as such address appears in the Security Register. Unless otherwise indicated in the applicable prospectus supplement, the corporate trust office of the Trustee under the Senior Indenture in The City of New York will be designated as sole Paying Agent for payments with respect to Senior Debt Securities of each series, and the corporate trust office of the Trustee under the Subordinated Indenture in The City of New York will be designated as the sole Paying Agent for payment with respect to Subordinated Debt Securities of each series. Any other Paying Agents initially designated by us for the Debt Securities of a particular series will be named in the applicable prospectus supplement. We may at any time designate additional Paying Agents or rescind the designation of any Paying Agent or approve a change in the office through which any Paying Agent acts, except that we will be required to maintain a Paying Agent in each Place of Payment for the Debt Securities of a particular series (Section 1002).
          All money paid by us to a Paying Agent for the payment of the principal of or any premium or interest on any Debt Security which remain unclaimed at the end of two years after such principal, premium or interest has become due and payable will be repaid to us, and the Holder of such Debt Security thereafter may look only to us for payment (Section 1003).
Consolidation, Merger and Sale of Assets
          We may not consolidate with or merge into, or transfer, lease or otherwise dispose of all or substantially all of our assets to, any Person (a “successor Person”), and may not permit any Person to consolidate with or merge into us, unless:
            (1)     the successor Person (if any) is a corporation, partnership, trust or other entity organized and validly existing under the laws of any domestic jurisdiction and assumes our obligations on the Debt Securities and under the Indentures;

10


Table of Contents

            (2)     immediately before and after giving pro forma effect to the transaction, no Event of Default, and no event which, after notice or lapse of time or both, would become an Event of Default, has occurred and is continuing; and
 
            (3)     several other conditions, including any additional conditions with respect to any particular Debt Securities specified in the applicable prospectus supplement, are met (Section 801).
Events of Default
          Unless otherwise specified in the prospectus supplement, each of the following will constitute an Event of Default under the applicable Indenture with respect to Debt Securities of any series:
            (1)     failure to pay principal of or any premium on any Debt Security of that series when due, whether or not, in the case of Subordinated Debt Securities, such payment is prohibited by the subordination provisions of the Subordinated Indenture;
 
            (2)     failure to pay any interest on any Debt Securities of that series when due, continued for 30 days, whether or not, in the case of Subordinated Debt Securities, such payment is prohibited by the subordination provisions of the Subordinated Indenture;
 
            (3)     failure to deposit any sinking fund payment, when due, in respect of any Debt Security of that series, whether or not, in the case of Subordinated Debt Securities, such deposit is prohibited by the subordination provisions of the Subordinated Indenture;
 
            (4)     failure to perform or comply with the provisions described under “— Consolidation, Merger and Sale of Assets”;
 
            (5)     failure to perform any of our other covenants in such Indenture (other than a covenant included in such Indenture solely for the benefit of a series other than that series), continued for 60 days after written notice has been given by the applicable Trustee, or the Holders of at least 25% in principal amount of the Outstanding Debt Securities of that series, as provided in such Indenture;
 
            (6)     Indebtedness of ourself, any Significant Subsidiary or, if a Subsidiary Guarantor has guaranteed the series, such Subsidiary Guarantor, is not paid within any applicable grace period after final maturity or is accelerated by its holders because of a default and the total amount of such Indebtedness unpaid or accelerated exceeds $20.0 million;
 
            (7)     any judgment or decree for the payment of money in excess of $20.0 million is entered against us, any Significant Subsidiary or, if a Subsidiary Guarantor has guaranteed the series, such Subsidiary Guarantor, remains outstanding for a period of 60 consecutive days following entry of such judgment and is not discharged, waived or stayed;
 
            (8)     certain events of bankruptcy, insolvency or reorganization affecting us, any Significant Subsidiary or, if a Subsidiary Guarantor has guaranteed the series, such Subsidiary Guarantor; and
 
            (9)     if any Subsidiary Guarantor has guaranteed such series, the Subsidiary Guarantee of any such Subsidiary Guarantor is held by a final non-appealable order or judgment of a court of competent jurisdiction to be unenforceable or invalid or ceases for any reason to be in full force and effect (other than in accordance with the terms of the applicable Indenture) or any Subsidiary Guarantor or any Person acting on behalf of any Subsidiary Guarantor denies or disaffirms such Subsidiary Guarantor’s obligations under its Subsidiary Guarantee (other than by reason of a release of such Subsidiary Guarantor from its Subsidiary Guarantee in accordance with the terms of the applicable Indenture) (Section 501).
          If an Event of Default (other than an Event of Default with respect to Whiting Petroleum Corporation described in clause (8) above) with respect to the Debt Securities of any series at the time

11


Table of Contents

Outstanding occurs and is continuing, either the applicable Trustee or the Holders of at least 25% in principal amount of the Outstanding Debt Securities of that series by notice as provided in the Indenture may declare the principal amount of the Debt Securities of that series (or, in the case of any Debt Security that is an Original Issue Discount Debt Security, such portion of the principal amount of such Debt Security as may be specified in the terms of such Debt Security) to be due and payable immediately. If an Event of Default with respect to Whiting Petroleum Corporation described in clause (8) above with respect to the Debt Securities of any series at the time Outstanding occurs, the principal amount of all the Debt Securities of that series (or, in the case of any such Original Issue Discount Security, such specified amount) will automatically, and without any action by the applicable Trustee or any Holder, become immediately due and payable. After any such acceleration, but before a judgment or decree based on acceleration, the Holders of a majority in principal amount of the Outstanding Debt Securities of that series may, under certain circumstances, rescind and annul such acceleration if all Events of Default, other than the non-payment of accelerated principal (or other specified amount), have been cured or waived as provided in the applicable Indenture (Section 502). For information as to waiver of defaults, see “— Modification and Waiver” below.
          Subject to the provisions of the Indentures relating to the duties of the Trustees in case an Event of Default has occurred and is continuing, each Trustee will be under no obligation to exercise any of its rights or powers under the applicable Indenture at the request or direction of any of the Holders, unless such Holders have offered to such Trustee reasonable indemnity (Section 603). Subject to such provisions for the indemnification of the Trustees, the Holders of a majority in principal amount of the Outstanding Debt Securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the Trustee or exercising any trust or power conferred on the Trustee with respect to the Debt Securities of that series (Section 512).
          No Holder of a Debt Security of any series will have any right to institute any proceeding with respect to the applicable Indenture, or for the appointment of a receiver or a trustee, or for any other remedy thereunder, unless:
            (1)     such Holder has previously given to the Trustee under the applicable Indenture written notice of a continuing Event of Default with respect to the Debt Securities of that series;
 
            (2)     the Holders of at least 25% in principal amount of the Outstanding Debt Securities of that series have made written request, and such Holder or Holders have offered reasonable indemnity, to the Trustee to institute such proceeding as trustee; and
 
            (3)     the Trustee has failed to institute such proceeding, and has not received from the Holders of a majority in principal amount of the Outstanding Debt Securities of that series a direction inconsistent with such request, within 60 days after such notice, request and offer (Section 507).
          However, such limitations do not apply to a suit instituted by a Holder of a Debt Security for the enforcement of payment of the principal of or any premium or interest on such Debt Security on or after the applicable due date specified in such Debt Security or, if applicable, to convert such Debt Security (Section 508).
          We will be required to furnish to each Trustee annually a statement by certain of our officers as to whether or not we, to their knowledge, are in default in the performance or observance of any of the terms, provisions and conditions of the applicable Indenture and, if so, specifying all such known defaults (Section 1004).
Modification and Waiver
          Modifications and amendments of an Indenture may be made by us, the Subsidiary Guarantors, if applicable, and the applicable Trustee with the consent of the Holders of a majority in principal amount of the Outstanding Debt Securities of each series affected by such modification or amendment; provided,

12


Table of Contents

however, that no such modification or amendment may, without the consent of the Holder of each Outstanding Debt Security affected thereby:
            (1)     change the Stated Maturity of the principal of, or any installment of principal of or interest on, any Debt Security;
 
            (2)     reduce the principal amount of, or any premium or interest on, any Debt Security;
 
            (3)     reduce the amount of principal of an Original Issue Discount Security or any other Debt Security payable upon acceleration of the Maturity thereof;
 
            (4)     change the place or currency of payment of principal of, or any premium or interest on, any Debt Security;
 
            (5)     impair the right to institute suit for the enforcement of any payment due on or any conversion right with respect to any Debt Security;
 
            (6)     modify the subordination provisions in the case of Subordinated Debt Securities, or modify any conversion provisions, in either case in a manner adverse to the Holders of the Subordinated Debt Securities;
 
            (7)     except as provided in the applicable Indenture, release the Subsidiary Guarantee of a Subsidiary Guarantor;
 
            (8)     reduce the percentage in principal amount of Outstanding Debt Securities of any series, the consent of whose Holders is required for modification or amendment of the Indenture;
 
            (9)     reduce the percentage in principal amount of Outstanding Debt Securities of any series necessary for waiver of compliance with certain provisions of the Indenture or for waiver of certain defaults; or
 
            (10)     modify such provisions with respect to modification, amendment or waiver (Section 902).
          The Holders of a majority in principal amount of the Outstanding Debt Securities of any series may waive compliance by us with certain restrictive provisions of the applicable Indenture (Section 1009). The Holders of a majority in principal amount of the Outstanding Debt Securities of any series may waive any past default under the applicable Indenture, except a default in the payment of principal, premium or interest and certain covenants and provisions of the Indenture which cannot be amended without the consent of the Holder of each Outstanding Debt Security of such series (Section 513).
          Each of the Indentures provides that in determining whether the Holders of the requisite principal amount of the Outstanding Debt Securities have given or taken any direction, notice, consent, waiver or other action under such Indenture as of any date:
            (1)     the principal amount of an Original Issue Discount Security that will be deemed to be Outstanding will be the amount of the principal that would be due and payable as of such date upon acceleration of maturity to such date;
 
            (2)     if, as of such date, the principal amount payable at the Stated Maturity of a Debt Security is not determinable (for example, because it is based on an index), the principal amount of such Debt Security deemed to be Outstanding as of such date will be an amount determined in the manner prescribed for such Debt Security; and
 
            (3)     the principal amount of a Debt Security denominated in one or more foreign currencies or currency units that will be deemed to be Outstanding will be the United States-dollar equivalent, determined as of such date in the manner prescribed for such Debt Security, of the principal amount of such Debt Security (or, in the case of a Debt Security described in clause (1) or (2) above, of the amount described in such clause).

13


Table of Contents

          Certain Debt Securities, including those owned by us, any Subsidiary Guarantor or any of our other Affiliates, will not be deemed to be Outstanding (Section 101).
          Except in certain limited circumstances, we will be entitled to set any day as a record date for the purpose of determining the Holders of Outstanding Debt Securities of any series entitled to give or take any direction, notice, consent, waiver or other action under the applicable Indenture, in the manner and subject to the limitations provided in the Indenture. In certain limited circumstances, the Trustee will be entitled to set a record date for action by Holders. If a record date is set for any action to be taken by Holders of a particular series, only persons who are Holders of Outstanding Debt Securities of that series on the record date may take such action. To be effective, such action must be taken by Holders of the requisite principal amount of such Debt Securities within a specified period following the record date. For any particular record date, this period will be 180 days or such other period as may be specified by us (or the Trustee, if it set the record date), and may be shortened or lengthened (but not beyond 180 days) from time to time (Section 104).
Satisfaction and Discharge
          Each Indenture will be discharged and will cease to be of further effect as to all outstanding Debt Securities of any series issued thereunder, when:
            (1)     either:
            (a)     all outstanding Debt Securities of that series that have been authenticated (except lost, stolen or destroyed Debt Securities that have been replaced or paid and Debt Securities for whose payment money has theretofore been deposited in trust and thereafter repaid to us) have been delivered to the Trustee for cancellation; or
 
            (b)     all outstanding Debt Securities of that series that have not been delivered to the Trustee for cancellation have become due and payable or will become due and payable at their Stated Maturity within one year or are to be called for redemption within one year under arrangements satisfactory to the Trustee and in any case we have irrevocably deposited with the Trustee as trust funds money in an amount sufficient, without consideration of any reinvestment of interest, to pay the entire indebtedness of such Debt Securities not delivered to the Trustee for cancellation, for principal, premium, if any, and accrued interest to the Stated Maturity or redemption date;
            (2)     we have paid or caused to be paid all other sums payable by us under the Indenture with respect to the Debt Securities of that series; and
 
            (3)     we have delivered an Officers’ Certificate and an Opinion of Counsel to the Trustee stating that all conditions precedent to satisfaction and discharge of the Indenture with respect to the Debt Securities of that series have been satisfied (Article Four).
Legal Defeasance and Covenant Defeasance
          If and to the extent indicated in the applicable prospectus supplement, we may elect, at our option at any time, to have the provisions of Section 1502, relating to defeasance and discharge of indebtedness, which we call “legal defeasance” or Section 1503, relating to defeasance of certain restrictive covenants applied to the Debt Securities of any series, or to any specified part of a series, which we call “covenant defeasance” (Section 1501).
          Legal Defeasance. The Indentures provide that, upon our exercise of our option (if any) to have Section 1502 applied to any Debt Securities, we and, if applicable, each Subsidiary Guarantor will be discharged from all our obligations, and, if such Debt Securities are Subordinated Debt Securities, the provisions of the Subordinated Indenture relating to subordination will cease to be effective, with respect to such Debt Securities (except for certain obligations to convert, exchange or register the transfer of Debt Securities, to replace stolen, lost or mutilated Debt Securities, to maintain paying agencies and to hold

14


Table of Contents

moneys for payment in trust) upon the deposit in trust for the benefit of the Holders of such Debt Securities of money or United States Government Obligations, or both, which, through the payment of principal and interest in respect thereof in accordance with their terms, will provide money in an amount sufficient to pay the principal of and any premium and interest on such Debt Securities on the respective Stated Maturities in accordance with the terms of the applicable Indenture and such Debt Securities. Such defeasance or discharge may occur only if, among other things:
            (1)     we have delivered to the applicable Trustee an Opinion of Counsel to the effect that we have received from, or there has been published by, the United States Internal Revenue Service a ruling, or there has been a change in tax law, in either case to the effect that Holders of such Debt Securities will not recognize gain or loss for federal income tax purposes as a result of such deposit and legal defeasance and will be subject to federal income tax on the same amount, in the same manner and at the same times as would have been the case if such deposit and legal defeasance were not to occur;
 
            (2)     no Event of Default or event that with the passing of time or the giving of notice, or both, shall constitute an Event of Default shall have occurred and be continuing at the time of such deposit or, with respect to any Event of Default described in clause (8) under “— Events of Default,” at any time until 121 days after such deposit;
 
            (3)     such deposit and legal defeasance will not result in a breach or violation of, or constitute a default under, any agreement or instrument to which we are a party or by which we are bound;
 
            (4)     in the case of Subordinated Debt Securities, at the time of such deposit, no default in the payment of all or a portion of principal of (or premium, if any) or interest on any of our Senior Debt shall have occurred and be continuing, no event of default shall have resulted in the acceleration of any of our Senior Debt and no other event of default with respect to any of our Senior Debt shall have occurred and be continuing permitting after notice or the lapse of time, or both, the acceleration thereof; and
 
            (5)     we have delivered to the Trustee an Opinion of Counsel to the effect that such deposit shall not cause the Trustee or the trust so created to be subject to the Investment Company Act of 1940 (Sections 1502 and 1504).
          Covenant Defeasance. The Indentures provide that, upon our exercise of our option (if any) to have Section 1503 applied to any Debt Securities, we may omit to comply with certain restrictive covenants (but not to conversion, if applicable), including those that may be described in the applicable prospectus supplement, the occurrence of certain Events of Default, which are described above in clause (5) (with respect to such restrictive covenants) and clauses (6), (7) and (9) under “Events of Default” and any that may be described in the applicable prospectus supplement, will not be deemed to either be or result in an Event of Default and, if such Debt Securities are Subordinated Debt Securities, the provisions of the Subordinated Indenture relating to subordination will cease to be effective, in each case with respect to such Debt Securities. In order to exercise such option, we must deposit, in trust for the benefit of the Holders of such Debt Securities, money or United States Government Obligations, or both, which, through the payment of principal and interest in respect thereof in accordance with their terms, will provide money in an amount sufficient to pay the principal of and any premium and interest on such Debt Securities on the respective Stated Maturities in accordance with the terms of the applicable Indenture and such Debt Securities. Such covenant defeasance may occur only if we have delivered to the applicable Trustee an Opinion of Counsel that in effect says that Holders of such Debt Securities will not recognize gain or loss for federal income tax purposes as a result of such deposit and covenant defeasance and will be subject to federal income tax on the same amount, in the same manner and at the same times as would have been the case if such deposit and covenant defeasance were not to occur, and the requirements set forth in clauses (2), (3), (4) and (5) above are satisfied. If we exercise this option with respect to any Debt Securities and such Debt Securities were declared due and payable because of the occurrence of any Event of Default, the amount of money and United States Government Obligations so

15


Table of Contents

deposited in trust would be sufficient to pay amounts due on such Debt Securities at the time of their respective Stated Maturities but may not be sufficient to pay amounts due on such Debt Securities upon any acceleration resulting from such Event of Default. In such case, we would remain liable for such payments (Sections 1503 and 1504).
          If we exercise either our legal defeasance or covenant defeasance option, any Subsidiary Guarantees will terminate (Section 1304).
Notices
          Notices to Holders of Debt Securities will be given by mail to the addresses of such Holders as they may appear in the Security Register (Sections 101 and 106).
Title
          We, the Subsidiary Guarantors, the Trustees and any agent of us, the Subsidiary Guarantors or a Trustee may treat the Person in whose name a Debt Security is registered as the absolute owner of the Debt Security (whether or not such Debt Security may be overdue) for the purpose of making payment and for all other purposes (Section 308).
Governing Law
          The Indentures and the Debt Securities will be governed by, and construed in accordance with, the law of the State of New York (Section 112).

16


Table of Contents

DESCRIPTION OF CAPITAL STOCK
General
          The authorized capital stock of Whiting Petroleum Corporation consists of 75,000,000 shares of common stock, $0.001 par value per share and 5,000,000 shares of preferred stock, $0.001 par value per share.
          The following description of our capital stock summarizes general terms and provisions that apply to our capital stock. Since this is only a summary it does not contain all of the information that may be important to you. The summary is subject to and qualified in its entirety by reference to our certificate of incorporation and our by-laws, which are filed as exhibits to the registration statement of which this prospectus is a part and incorporated by reference into this prospectus. See “Where You Can Find More Information.”
Common Stock
          Holders of our common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders and do not have cumulative voting rights. Accordingly, holders of a majority of the shares of our common stock entitled to vote in any election of directors may elect all of the directors standing for election. Holders of our common stock are entitled to receive proportionately any dividends if and when such dividends are declared by our board of directors, subject to any preferential dividend rights of outstanding preferred stock. Upon the liquidation, dissolution or winding up of our company, the holders of our common stock are entitled to receive ratably our net assets available after the payment of all debts and other liabilities and subject to the prior rights of any outstanding preferred stock. Holders of our common stock have no preemptive, subscription, redemption or conversion rights. The rights, preferences and privileges of holders of our common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that we may designate and issue in the future.
Preferred Stock
          If we offer preferred stock, we will file the terms of the preferred stock with the SEC and the prospectus supplement relating to that offering will include a description of the specific terms of the offering, including the following specific terms:
         • the series, the number of shares offered and the liquidation value of the preferred stock;
 
         • the price at which the preferred stock will be issued;
 
         • the dividend rate, the dates on which the dividends will be payable and other terms relating to the payment of dividends on the preferred stock;
 
         • the liquidation preference of the preferred stock;
 
         • the voting rights of the preferred stock;
 
         • whether the preferred stock is redeemable or subject to a sinking fund, and the terms of any such redemption or sinking fund;
 
         • whether the preferred stock is convertible or exchangeable for any other securities, and the terms of any such conversion; and
 
         • any additional rights, preferences, qualifications, limitations and restrictions of the preferred stock.
          Under the terms of our certificate of incorporation, our board of directors is authorized to designate and issue shares of preferred stock in one or more series without stockholder approval. Our board of directors has discretion to determine the rights, preferences, privileges and restrictions, including voting

17


Table of Contents

rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, of each series of preferred stock.
          It is not possible to state the actual effect of the issuance of any shares of preferred stock upon the rights of holders of our common stock until the board of directors determines the specific rights of the holders of the preferred stock. However, these effects might include:
         • restricting dividends on the common stock;
 
         • diluting the voting power of the common stock;
 
         • impairing the liquidation rights of the common stock; and
 
         • delaying or preventing a change in control of our company.
Delaware Anti-Takeover Law and Charter and By-law Provisions
          We are subject to the provisions of Section 203 of the Delaware General Corporation Law. In general, the statute prohibits a publicly held Delaware corporation from engaging in a “business combination” with an “interested stockholder” for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination or the transaction by which the person became an interested stockholder is approved by the corporation’s board of directors and/or stockholders in a prescribed manner or the person owns at least 85% of the corporation’s outstanding voting stock after giving effect to the transaction in which the person became an interested stockholder. The term “business combination” includes mergers, asset sales and other transactions resulting in a financial benefit to the interested stockholder. Subject to certain exceptions, an “interested stockholder” is a person who, together with affiliates and associates, owns, or within three years did own, 15% or more of the corporation’s voting stock. A Delaware corporation may “opt out” from the application of Section 203 through a provision in its certificate of incorporation or by-laws. We have not “opted out” from the application of Section 203.
          Under our certificate of incorporation and by-laws, our board of directors is divided into three classes, with staggered terms of three years each. Each year the term of one class expires. Any vacancies on the board of directors may be filled only by a majority vote of the remaining directors. Our certificate of incorporation and by-laws also provide that any director may be removed from office, but only for cause and only by the affirmative vote of the holders of at least 70% of the voting power of our then outstanding capital stock entitled to vote generally in the election of directors.
          Our certificate of incorporation prohibits stockholders from taking action by written consent without a meeting and provides that meetings of stockholders may be called only by our chairman of the board, our president or a majority of our board of directors. Our by-laws further provide that nominations for the election of directors and advance notice of other action to be taken at meetings of stockholders must be given in the manner provided in our by-laws, which contain detailed notice requirements relating to nominations and other action.
          The foregoing provisions of our certificate of incorporation and by-laws and the provisions of Section 203 of the Delaware General Corporation Law could have the effect of delaying, deferring or preventing a change of control of our company.
Liability and Indemnification of Officers and Directors
          Our certificate of incorporation provides that our directors will not be personally liable to us or our stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (1) for any breach of a director’s duty of loyalty to us or our stockholders, (2) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (3) under Section 174 of the Delaware General Corporation Law, or (4) for any transaction from which the director derives an improper personal benefit. Moreover, the provisions do not apply to claims against a director for violations of certain laws, including federal securities laws. If the Delaware General Corporation Law is amended to

18


Table of Contents

authorize the further elimination or limitation of directors’ liability, then the liability of our directors will automatically be limited to the fullest extent provided by law. Our certificate of incorporation and by-laws also contain provisions to indemnify our directors and officers to the fullest extent permitted by the Delaware General Corporation Law. In addition, we may enter into indemnification agreements with our directors and officers. These provisions and agreements may have the practical effect in certain cases of eliminating the ability of stockholders to collect monetary damages from our directors and officers. We believe that these contractual agreements and the provisions in our certificate of incorporation and by-laws are necessary to attract and retain qualified persons as directors and officers.
Transfer Agent and Registrar
          The transfer agent and registrar for our common stock is Computershare Trust Company, Inc.

19


Table of Contents

DESCRIPTION OF WARRANTS
          We may issue warrants for the purchase of debt securities, preferred stock, common stock or other securities. Warrants may be issued independently or together with debt securities, preferred stock, or common stock offered by any prospectus supplement and may be attached to or separate from any such offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between us and a bank or trust company, as warrant agent, all as will be set forth in the prospectus supplement relating to the particular issue of warrants. The warrant agent will act solely as our agent in connection with the warrants and will not assume any obligation or relationship of agency or trust for or with any holders of warrants or beneficial owners of warrants.
          The following summary of certain provisions of the warrants does not purport to be complete and is subject to, and is qualified in its entirety by reference to, all provisions of the warrant agreements.
          Reference is made to the prospectus supplement relating to the particular issue of warrants offered pursuant to such prospectus supplement for the terms of and information relating to such warrants, including, where applicable:
         • the designation, aggregate principal amount, currencies, denominations and terms of the series of debt securities purchasable upon exercise of warrants to purchase debt securities and the price at which such debt securities may be purchased upon such exercise;
 
         • the number of shares of common stock purchasable upon the exercise of warrants to purchase common stock and the price at which such number of shares of common stock may be purchased upon such exercise;
 
         • the number of shares and series of preferred stock purchasable upon the exercise of warrants to purchase preferred stock and the price at which such number of shares of such series of preferred stock may be purchased upon such exercise;
 
         • the designation and number of units of other securities purchasable upon the exercise of warrants to purchase other securities and the price at which such number of units of such other securities may be purchased upon such exercise;
 
         • the date on which the right to exercise such warrants shall commence and the date on which such right shall expire;
 
         • United States federal income tax consequences applicable to such warrants;
 
         • the amount of warrants outstanding as of the most recent practicable date; and
 
         • any other terms of such warrants.
          Warrants will be issued in registered form only. The exercise price for warrants will be subject to adjustment in accordance with the applicable prospectus supplement.
          Each warrant will entitle the holder thereof to purchase such principal amount of debt securities or such number of shares of preferred stock, common stock or other securities at such exercise price as shall in each case be set forth in, or calculable from, the prospectus supplement relating to the warrants, which exercise price may be subject to adjustment upon the occurrence of certain events as set forth in such prospectus supplement. After the close of business on the expiration date, or such later date to which such expiration date may be extended by us, unexercised warrants will become void. The place or places where, and the manner in which, warrants may be exercised shall be specified in the prospectus supplement relating to such warrants.
          Prior to the exercise of any warrants to purchase debt securities, preferred stock, common stock or other securities, holders of such warrants will not have any of the rights of holders of debt securities, preferred stock, common stock or other securities, as the case may be, purchasable upon such exercise, including the right to receive payments of principal of, premium, if any, or interest, if any, on the debt securities purchasable upon such exercise or to enforce covenants in the applicable Indenture, or to receive payments of dividends, if any, on the preferred stock, or common stock purchasable upon such exercise, or to exercise any applicable right to vote.

20


Table of Contents

DESCRIPTION OF STOCK PURCHASE CONTRACTS AND STOCK PURCHASE UNITS
          We may issue stock purchase contracts, including contracts obligating holders to purchase from us, and obligating us to sell to the holders, a specified number of shares of common stock or other securities at a future date or dates, which we refer to in this prospectus as “stock purchase contracts.” The price per share of the securities and the number of shares of the securities may be fixed at the time the stock purchase contracts are issued or may be determined by reference to a specific formula set forth in the stock purchase contracts. The stock purchase contracts may be issued separately or as part of units consisting of a stock purchase contract and debt securities, preferred securities, warrants, other securities or debt obligations of third parties, including U.S. treasury securities, securing the holders’ obligations to purchase the securities under the stock purchase contracts, which we refer to herein as “stock purchase units.” The stock purchase contracts may require holders to secure their obligations under the stock purchase contracts in a specified manner. The stock purchase contracts also may require us to make periodic payments to the holders of the stock purchase units or vice versa, and those payments may be unsecured or refunded on some basis.
          The stock purchase contracts, and, if applicable, collateral or depositary arrangements, relating to the stock purchase contracts or stock purchase units, will be filed with the SEC in connection with the offering of stock purchase contracts or stock purchase units. The prospectus supplement relating to a particular issue of stock purchase contracts or stock purchase units will describe the terms of those stock purchase contracts or stock purchase units, including the following:
         • if applicable, a discussion of material United States federal income tax considerations; and
 
         • any other information we think is important about the stock purchase contracts or the stock purchase units.

21


Table of Contents

PLAN OF DISTRIBUTION
          We may sell the offered securities in and outside the United States (1) through underwriters or dealers, (2) directly to purchasers, including our affiliates and shareholders, or in a rights offering, (3) through agents or (4) through a combination of any of these methods. The prospectus supplement will include the following information:
         • the terms of the offering;
 
         • the names of any underwriters, dealers or agents;
 
         • the name or names of any managing underwriter or underwriters;
 
         • the purchase price of the securities;
 
         • the net proceeds from the sale of the securities;
 
         • any delayed delivery arrangements;
 
         • any underwriting discounts, commissions and other items constituting underwriters’ compensation;
 
         • any initial public offering price;
 
         • any discounts or concessions allowed or reallowed or paid to dealers; and
 
         • any commissions paid to agents.
          In addition, we may enter into derivative transactions with third parties, or sell securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement indicates, in connection with those derivatives, the third parties may sell securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third parties may use securities pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of stock, and may use securities received from us in settlement of those derivatives to close out any related open borrowings of stock. The third parties in such sale transactions will be underwriters and, if not identified in this prospectus, will be identified in the applicable prospectus supplement (or a post-effective amendment). We or one of our affiliates may loan or pledge securities to a financial institution or other third party that in turn may sell the securities using this prospectus. Such financial institution or third party may transfer its short position to investors in our securities or in connection with a simultaneous offering of other securities offered by this prospectus or otherwise.
Sale Through Underwriters or Dealers
          If we use underwriters in the sale, the underwriters will acquire the securities for their own account for resale to the public. The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters. Unless we inform you otherwise in the prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all of the offered securities if they purchase any of them. The underwriters may change from time to time any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers.
          Representatives of the underwriters through whom the offered securities are sold for public offering and sale may engage in over-allotment, stabilizing transactions, syndicate short covering transactions and penalty bids in accordance with Regulation M under the Securities Exchange Act of 1934. Over-allotment involves syndicate sales in excess of the offering size, which creates a syndicate short position. Stabilizing transactions permit bids to purchase the offered securities so long as the stabilizing

22


Table of Contents

bids do not exceed a specified maximum. Syndicate covering transactions involve purchases of the offered securities in the open market after the distribution has been completed in order to cover syndicate short positions. Penalty bids permit the representative of the underwriters to reclaim a selling concession from a syndicate member when the offered securities originally sold by such syndicate member are purchased in a syndicate covering transaction to cover syndicate short positions. Such stabilizing transactions, syndicate covering transactions and penalty bids may cause the price of the offered securities to be higher than it would otherwise be in the absence of such transactions. These transactions may be effected on a national securities exchange and, if commenced, may be discontinued at any time.
          Some or all of the securities that we offer though this prospectus may be new issues of securities with no established trading market. Any underwriters to whom we sell our securities for public offering and sale may make a market in those securities, but they will not be obligated to do so and they may discontinue any market making at any time without notice. Accordingly, we cannot assure you of the liquidity of, or continued trading markets for, any securities that we offer.
          If we use dealers in the sale of securities, we will sell the securities to them as principals. They may then resell those securities to the public at varying prices determined by the dealers at the time of resale. We will include in the prospectus supplement the names of the dealers and the terms of the transaction.
Direct Sales and Sales through Agents
          We may sell the securities directly. In this case, no underwriters or agents would be involved. We may also sell the securities through agents designated from time to time. In the prospectus supplement, we will name any agent involved in the offer or sale of the offered securities, and we will describe any commissions payable to the agent. Unless we inform you otherwise in the prospectus supplement, any agent will agree to use its reasonable best efforts to solicit purchases for the period of its appointment.
          We may sell the securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act of 1933 with respect to any sale of those securities. We will describe the terms of any such sales in the prospectus supplement.
          We may also make direct sales through subscription rights distributed to our existing shareholders on a pro rata basis that may or may not be transferable. In any distribution of subscription rights to our shareholders, if all of the underlying securities are not subscribed for, we may then sell the unsubscribed securities directly to third parties or we may engage the services of one or more underwriters, dealers or agents, including standby underwriters, to sell the unsubscribed securities to third parties.
Remarketing Arrangements
          Offered securities may also be offered and sold, if so indicated in the applicable prospectus supplement, in connection with a remarketing upon their purchase, in accordance with a redemption or repayment pursuant to their terms, or otherwise, by one or more remarketing firms, acting as principals for their own accounts or as agents for us. Any remarketing firm will be identified and the terms of its agreements, if any, with us and its compensation will be described in the applicable prospectus supplement. Remarketing firms may be deemed to be underwriters, as that term is defined in the Securities Act of 1933, in connection with the securities remarketed.
Delayed Delivery Arrangements
          If we so indicate in the prospectus supplement, we may authorize agents, underwriters or dealers to solicit offers from certain types of institutions to purchase securities from us at the public offering price under delayed delivery contracts. These contracts would provide for payment and delivery on a specified date in the future. The contracts would be subject only to those conditions described in the prospectus supplement. The prospectus supplement will describe the commission payable for solicitation of those contracts.

23


Table of Contents

General Information
          We may have agreements with the underwriters, dealers and agents to indemnify them against certain civil liabilities, including liabilities under the Securities Act of 1933, or to contribute with respect to payments that the underwriters, dealers or agents may be required to make.
          Underwriters, dealers and agents may engage in transactions with, or perform services for, us in the ordinary course of our business.

24


Table of Contents

WHERE YOU CAN FIND MORE INFORMATION
          We file annual, quarterly and current reports, proxy statements and other information with the SEC. We also filed a registration statement on Form S-3, including exhibits, under the Securities Act of 1933 with respect to the securities offered by this prospectus. This prospectus is a part of the registration statement, but does not contain all of the information included in the registration statement or the exhibits. You may read and copy the registration statement and any other document that we file at the SEC’s public reference room at 450 Fifth Street, N.W., Washington D.C. You can call the SEC at 1-800-SEC-0330 for further information on the operation of the public reference room. You can also find our public filings with the SEC on the internet at a web site maintained by the SEC located at http://www.sec.gov.
          We are “incorporating by reference” specified documents that we file with the SEC, which means:
         • incorporated documents are considered part of this prospectus;
 
         • we are disclosing important information to you by referring you to those documents; and
 
         • information we file with the SEC will automatically update and supersede information contained in this prospectus.
          We incorporate by reference the documents listed below and any future filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 after the date of this prospectus and before the end of the offering of the securities pursuant to this prospectus:
         • our Annual Report on Form 10-K for the year ended December 31, 2003;
 
         • our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2004, June 30, 2004 and September 30, 2004;
 
         • our Current Reports on Form 8-K, dated February 2, 2004, April 22, 2004, April 26, 2004, May 6, 2004, June 3, 2004, July 20, 2004, September 1, 2004, September 23, 2004 (as amended by Amendment No. 1 thereto on Form 8-K/ A filed on October 18, 2004), October 26, 2004 and November 16, 2004; and
 
         • the description of our common stock contained in our Registration Statement on Form 8-A, dated November 14, 2003, and any amendment or report updating that description.
          You may request a copy of any of these filings, at no cost, by request directed to us at the following address or telephone number:
  Whiting Petroleum Corporation
1700 Broadway, Suite 2300
Denver, Colorado 80290
(303) 837-1661
Attention: Corporate Secretary

25


Table of Contents

LEGAL MATTERS
          The validity of the securities offered by this prospectus will be passed upon for us by Foley & Lardner LLP. Welborn Sullivan Meck & Tooley, P.C. will pass on certain legal matters relating to us and our subsidiaries for us in connection with any offerings of the securities. Any underwriters will be advised by Vinson & Elkins L.L.P. about other issues relating to any offerings of the securities.
EXPERTS
          The consolidated financial statements of Whiting Petroleum Corporation as of December 31, 2003 and 2002 and for each of the three years in the period ended December 31, 2003, incorporated in this prospectus by reference from our Annual Report on Form 10-K for the year ended December 31, 2003 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report which is incorporated by reference herein (which report expresses an unqualified opinion and includes an explanatory paragraph referring to a change in Whiting Petroleum Corporation’s method of accounting for asset retirement obligations effective January 1, 2003), and have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.
          The statements of revenues and direct operating expenses of the Permian Basin Acquisition Properties for each of the three years in the period ended December 31, 2003, incorporated in this prospectus by reference from Amendment No. 1 to our Current Report on Form 8-K dated September 23, 2004 have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their report, which is incorporated by reference herein, and have been so incorporated in reliance upon the report of such firm given upon their authority as experts in accounting and auditing.
          Certain information with respect to our oil and natural gas reserves derived from the reports of Cawley Gillespie & Associates, Inc., R.A. Lenser & Associates, Inc. and Ryder Scott Company, L.P., each independent petroleum engineering consultants, has been incorporated in this registration statement by reference on the authority of said firms as experts in petroleum engineering.

26


Table of Contents

 
 
$220,000,000
(WHITING LOGO)
Whiting Petroleum Corporation
              % Senior Subordinated Notes due 2013
 
PROSPECTUS SUPPLEMENT
 
Merrill Lynch & Co.
Lehman Brothers
Banc of America Securities LLC
JPMorgan
Wachovia Securities
A.G. Edwards
KeyBanc Capital Markets
Petrie Parkman & Co.
Raymond James
April      , 2005