EXHIBIT 1 ================================================================================ WHITING PETROLEUM CORPORATION (a Delaware corporation) 7 1/4% SENIOR SUBORDINATED NOTES DUE 2013 PURCHASE AGREEMENT Dated: April 14, 2005 ================================================================================ WHITING PETROLEUM CORPORATION (a Delaware corporation) $220,000,000 7 1/4% Senior Subordinated Notes Due 2013 PURCHASE AGREEMENT April 14, 2005 MERRILL LYNCH & CO. 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. as Representatives of the several Underwriters c/o Merrill Lynch & Co. Merrill Lynch, Pierce, Fenner & Smith Incorporated 4 World Financial Center New York, New York 10080 Ladies and Gentlemen: Whiting Petroleum Corporation, a Delaware corporation (the "Company"), Whiting Oil and Gas Corporation, a Delaware corporation and wholly-owned subsidiary of the Company ("Whiting Oil and Gas"), Whiting Programs, Inc., a Delaware corporation and wholly-owned subsidiary of the Company ("Whiting Programs"), and Equity Oil Company, a Colorado corporation and wholly-owned subsidiary of the Company ("Equity Oil" and, collectively with Whiting Oil and Gas and Whiting Programs, the "Guarantors"), confirm their agreement with Merrill Lynch & Co., Merrill Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch") and each of the other underwriters named in Schedule A hereto (collectively, the "Underwriters", which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for whom Merrill Lynch, 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. and Raymond James & Associates, Inc. are acting as representatives (in such capacity, the 1 "Representatives"), with respect to the issue and sale by the Company and the purchase by the Underwriters, acting severally and not jointly, of the respective principal amounts set forth in said Schedule A of $220,000,000 aggregate principal amount of the Company's 7 1/4% Senior Subordinated Notes due 2013 (the "Securities"). The Securities are to be issued pursuant to an indenture to be dated as of April 19, 2005, and supplemented by the First Supplemental Indenture to be dated as of April 19, 2005 (collectively, the "Indenture"), among the Company, the Guarantors and J.P. Morgan Trust Company, National Association, as trustee (the "Trustee"). Securities issued in book-entry form will be issued to Cede & Co. as nominee of The Depository Trust Company ("DTC") pursuant to a blanket letter agreement, dated March 30, 2004 (as defined in Section 2(b)) (the "DTC Agreement"), between the Company and DTC. The Securities will be unconditionally guaranteed (the "Guaranties" and each a "Guaranty") on a senior subordinated basis by the Guarantors. The Company understands that the Underwriters propose to make a public offering of the Securities as soon as the Representatives deem advisable after this Agreement has been executed and delivered. The Company has filed with the Securities and Exchange Commission (the "Commission") a registration statement on Form S-3 (Registration No. 333-121615), including the related prospectus, for the registration of debt securities and other securities of the Company (including the Securities) under the Securities Act of 1933, as amended (the "1933 Act"), and the offering thereof from time to time in accordance with Rule 415 of the rules and regulations of the Commission under the 1933 Act (the "1933 Act Regulations"). Such registration statement, including any Rule 462(b) Registration Statement (as defined below), has been declared effective by the Commission and the Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended (the "1939 Act"). A prospectus supplement reflecting the terms of the Securities, the terms of the offering thereof and the other matters set forth therein has been prepared and will be filed pursuant to Rule 424 of the 1933 Act Regulations. Such prospectus supplement, in the form first filed after the date hereof pursuant to Rule 424, is herein referred to as the "Prospectus Supplement." Such registration statement on Form S-3 (Registration No. 333-121615), as amended at the date hereof, including the exhibits thereto, is herein called the "Registration Statement," and the basic prospectus included therein relating to all offerings of securities under the Registration Statement, as supplemented by the Prospectus Supplement, is herein called the "Prospectus;" provided, however, that, if such basic prospectus is amended or supplemented on or after the date hereof but prior to the date on which the Prospectus Supplement is first filed pursuant to Rule 424, the term "Prospectus" shall refer to the basic prospectus as so amended or supplemented and as supplemented by the Prospectus Supplement; and provided, further, that all references to the "Registration Statement" and the "Prospectus" shall be deemed to include all documents incorporated therein by reference pursuant to the Securities Exchange Act of 1934, as amended (the "1934 Act"); and provided, further, that if the Company files a registration statement with the Commission pursuant to Rule 462(b) of the 1933 Act Regulations (the "Rule 462(b) Registration Statement"), then, after such filing, all references to the "Registration Statement" shall also be deemed to include the Rule 462(b) Registration Statement. For purposes of this Agreement, all references to the Registration Statement, Prospectus, Prospectus Supplement or preliminary prospectus or to any amendment or supplement to any of the foregoing shall be deemed to include any copy filed with the 2 Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system ("EDGAR"). All references in this Agreement to financial statements and schedules and other information which is "described," "contained," "included" or "stated" in the Registration Statement, any preliminary prospectus or the Prospectus (or other references of like import) shall be deemed to mean and include all such financial statements and schedules and other information which is incorporated by reference in the Registration Statement, any preliminary prospectus or the Prospectus, as the case may be; and all references in this Agreement to amendments or supplements to the Registration Statement, any preliminary prospectus or the Prospectus shall be deemed to mean and include the filing of any document under the 1934 Act which is incorporated by reference in the Registration Statement, such preliminary prospectus or the Prospectus, as the case may be. SECTION 1. Representations and Warranties. (a) Representations and Warranties by the Company and the Guarantors. The Company and the Guarantors jointly and severally represent and warrant to each Underwriter as of the date hereof and as of the Closing Time referred to in Section 2(b) hereof, and agree with each Underwriter, as follows: (i) Compliance with Registration Requirements. The Company meets the requirements for use of Form S-3 under the 1933 Act. Each of the Registration Statement, any Rule 462(b) Registration Statement and any post-effective amendment thereto has become effective under the 1933 Act and no stop order suspending the effectiveness of the Registration Statement, any Rule 462(b) Registration Statement or any post-effective amendment thereto has been issued under the 1933 Act and no proceedings for that purpose have been instituted or are pending or, to the knowledge of the Company, are contemplated by the Commission, and any request on the part of the Commission for additional information has been complied with. At the respective times the Registration Statement, any Rule 462(b) Registration Statement and any post-effective amendments thereto became effective and at the Closing Time, the Registration Statement, the Rule 462(b) Registration Statement and any amendments and supplements thereto complied and will comply in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations and the 1939 Act and the rules and regulations of the Commission under the 1939 Act (the "1939 Act Regulations"), and did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. Neither the Prospectus nor any amendments or supplements thereto, at the time the Prospectus or any such amendment or supplement is issued and at the Closing Time, will include an untrue statement of a material fact or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. The representations and warranties in this paragraph shall not apply to statements in or omissions from the Registration Statement or Prospectus or any amendment or supplement thereto made in reliance upon and in conformity with written information furnished to the Company by 3 any Underwriter through Merrill Lynch expressly for use in the Registration Statement (or any amendment thereto) or the Prospectus (or any amendment or supplement thereto). Each preliminary prospectus and the prospectus filed as part of the Registration Statement as originally filed or as part of any amendment thereto complied when so filed in all material respects with the 1933 Act Regulations and each preliminary prospectus and the Prospectus to be delivered to the Underwriters for use in connection with this offering will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T. (ii) Incorporated Documents. The documents incorporated or deemed to be incorporated by reference in the Registration Statement and the Prospectus, at the time they were or hereafter are filed with the Commission, complied and will comply in all material respects with the requirements of the 1934 Act and the rules and regulations of the Commission thereunder (the "1934 Act Regulations"), and, when read together with the other information in the Prospectus, at the time the Registration Statement became effective, at the time the Prospectus is issued and at the Closing Time, did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. (iii) Independent Accountants. The accountants who certified the financial statements and supporting schedules included in the Registration Statement are independent public accountants with respect to the Company as required by the 1933 Act and the 1933 Act Regulations. (iv) Financial Statements. The financial statements included in the Registration Statement and the Prospectus, together with the related schedules and notes, present fairly in all material respects, on the basis set forth in the Prospectus, the financial position of the Company and its consolidated subsidiaries at the dates indicated and the statement of income, stockholders' equity and cash flows of the Company and its consolidated subsidiaries for the periods specified; said financial statements have been prepared in conformity with generally accepted accounting principles in the United States ("GAAP") applied on a consistent basis throughout the periods involved. The supporting schedules, if any, included in the Registration Statement present fairly in all material respects, on the basis set forth in the Prospectus, in accordance with GAAP the information required to be stated therein. The summary financial information included in the Prospectus presents fairly in all material respects the information shown therein and has been compiled on a basis consistent with that of the audited financial statements included in the Registration Statement. (v) No Material Adverse Change in Business. Since the respective dates as of which information is given in the Registration Statement and the Prospectus, except as otherwise stated therein, (A) there has been no material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company and its subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business (a "Material Adverse Effect"), (B) there have been no transactions entered into by the Company or any of its subsidiaries, other than those in 4 the ordinary course of business, which are material with respect to the Company and its subsidiaries considered as one enterprise, and (C) except as described in the Prospectus, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock. (vi) Good Standing of the Company. The Company has been duly organized and is validly existing as a corporation in good standing under the laws of the State of Delaware and has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Prospectus and to enter into and perform its obligations under this Agreement; and the Company is duly qualified as a foreign corporation to transact business and is in good standing in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect. (vii) Good Standing of Subsidiaries. Each of the Guarantors has been duly organized and is validly existing as a corporation in good standing under the laws of the jurisdiction of its incorporation, has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Prospectus and is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect; except as otherwise disclosed in the Registration Statement, all of the issued and outstanding capital stock of each such Guarantor has been duly authorized and validly issued, is fully paid and non-assessable and is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity; none of the outstanding shares of capital stock of any Subsidiary was issued in violation of the preemptive or similar rights of any securityholder of such Guarantor. The other subsidiaries of the Company other than the Guarantors, considered in the aggregate as a single subsidiary, do not constitute a "significant subsidiary" as defined in Rule 1-02 of Regulation S-X. (viii) Capitalization. The authorized, issued and outstanding capital stock of the Company is as set forth in the Prospectus in the column entitled "Actual" under the caption "Capitalization" (except for subsequent issuances, if any, pursuant to reservations, agreements or employee benefit plans referred to in the Prospectus). The shares of issued and outstanding capital stock of the Company have been duly authorized and validly issued and are fully paid and non-assessable; none of the outstanding shares of capital stock of the Company was issued in violation of the preemptive or other similar rights of any securityholder of the Company. (ix) Authorization of Agreement. This Agreement has been duly authorized, executed and delivered by the Company and each Guarantor. (x) Authorization of the Indenture. The Indenture has been duly authorized by the Company and each Guarantor and duly qualified under the 1939 Act and, when 5 duly executed and delivered by the Company and each Guarantor and the Trustee, will constitute a valid and binding agreement of the Company and each Guarantor, enforceable against the Company and each Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors' rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law). (xi) Authorization of the Securities. The Securities have been duly authorized and, at the Closing Time, will have been duly executed by the Company and, when authenticated, issued and delivered in the manner provided for in the Indenture and delivered against payment of the purchase price therefor as provided in this Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors' rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law), and will be in the form contemplated by, and entitled to the benefits of, the Indenture. (xii) Description of the Securities and the Indenture. The Securities and the Indenture will conform in all material respects to the respective statements relating thereto contained in the Prospectus and will be in substantially the respective forms filed or incorporated by reference, as the case may be, as exhibits to the Registration Statement. (xiii) Authorization of the Guaranties. The Guaranty of the Securities by each Guarantor thereof has been duly authorized by such Guarantor, and at Closing Time, will conform in all material respects to the description thereof contained in the Prospectus; when the Securities have been issued, executed and authenticated in accordance with the Indenture and delivered to and paid for by the Underwriters in accordance with the terms of this Agreement, the Guaranty of each Guarantor will constitute valid and legally binding obligations of such Guarantor enforceable against such Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors' rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law). (xiv) Absence of Defaults and Conflicts. None of the Company, the Guarantors or any of the Guarantors' subsidiaries is in violation of its charter or by-laws or in default in the performance or observance of any obligation, agreement, covenant or condition contained in any contract, indenture, mortgage, deed of trust, loan or credit agreement, note, lease or other agreement or instrument to which the Company, the Guarantors or any of the Guarantors' subsidiaries is a party or by which any of them may be bound, or 6 to which any of the property or assets of the Company, the Guarantors or any of the Guarantors' subsidiaries is subject (collectively, "Agreements and Instruments"), except for such violations or defaults that would not result in a Material Adverse Effect; and, except with respect to the retirement, redemption or payment by the Company or any affiliate of the Company of any part of the principal of the Securities at any time prior to the termination of all commitments and the payment and performance in full of all obligations under Whiting Oil and Gas' credit agreement, the execution, delivery and performance of this Agreement, the Indenture and the Securities and any other agreement or instrument entered into or issued or to be entered into or issued by the Company in connection with the transactions contemplated hereby or thereby or in the Prospectus and the consummation of the transactions contemplated herein and in the Prospectus (including the issuance and sale of the Securities and the use of the proceeds from the sale of the Securities as described in the Prospectus under the caption "Use of Proceeds") and compliance by each of the Company and the Guarantors with its obligations hereunder and under the Indenture and the Securities have been duly authorized by all necessary corporate action and do not and will not, whether with or without the giving of notice or passage of time or both, conflict with or constitute a breach of, or default or Repayment Event (as defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company, the Guarantors or any subsidiary of the Guarantors pursuant to, the Agreements and Instruments (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not result in a Material Adverse Effect), nor will such action result in any violation of the provisions of the charter or by-laws of the Company, the Guarantors or any subsidiary of the Guarantors or any applicable law, statute, rule, regulation, judgment, order, writ or decree of any government, government instrumentality or court, domestic or foreign, having jurisdiction over the Company, the Guarantors or any subsidiary of the Guarantors or any of their assets, properties or operations (except for such violations that would not result in a Material Adverse Effect). As used herein, a "Repayment Event" means any event or condition which gives the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder's behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Company, the Guarantors or any subsidiary of the Guarantors. (xv) Absence of Labor Dispute. No labor dispute with the employees of the Company or any subsidiary of the Company exists or, to the knowledge of the Company or the Guarantors, is imminent, and the Company and the Guarantors are not aware of any existing or imminent labor disturbance by the employees of any of their or any subsidiary's principal suppliers, manufacturers, customers or contractors, which, in either case, would reasonably be expected to result in a Material Adverse Effect. (xvi) Absence of Proceedings. There is no action, suit, proceeding, inquiry or investigation before or brought by any court or governmental agency or body, domestic or foreign, now pending, or, to the knowledge of the Company or the Guarantors, threatened, against or affecting the Company or any subsidiary of the Company, which is required to be disclosed in the Registration Statement (other than as disclosed therein), or which might reasonably be expected to result in a Material Adverse Effect, or which 7 might reasonably be expected to materially and adversely affect the properties or assets thereof or the consummation of the transactions contemplated by this Agreement or the performance by the Company or the Guarantors of their respective obligations hereunder. The aggregate of all pending legal or governmental proceedings to which the Company or any subsidiary of the Company is a party or of which any of their respective property or assets is the subject which are not described in the Registration Statement, including ordinary routine litigation incidental to the business, could not reasonably be expected to result in a Material Adverse Effect. (xvii) Accuracy of Exhibits. There are no contracts or documents which are required to be described in the Registration Statement, the Prospectus or the documents incorporated by reference therein or to be filed as exhibits thereto which have not been so described and filed as required. (xviii) Possession of Intellectual Property. The Company and its subsidiaries own or possess, or can acquire on reasonable terms, adequate patents, patent rights, licenses, inventions, copyrights, know how (including trade secrets and other unpatented and/or unpatentable proprietary or confidential information, systems or procedures), trademarks, service marks, trade names or other intellectual property (collectively, "Intellectual Property") necessary to carry on the business now operated by them, and neither the Company nor any of its subsidiaries has received any written notice or is otherwise aware of any infringement of or conflict with asserted rights of others with respect to any Intellectual Property or of any facts or circumstances which would render any Intellectual Property invalid or inadequate to protect the interest of the Company or any of its subsidiaries therein, and which infringement or conflict (if the subject of any unfavorable decision, ruling or finding) or invalidity or inadequacy, singly or in the aggregate, would result in a Material Adverse Effect. (xix) Absence of Manipulation. Neither the Company nor any affiliate of the Company has taken, nor will the Company or any affiliate take, directly or indirectly, any action which is designed to or which has constituted or which would be expected to cause or result in stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Securities. (xx) Absence of Further Requirements. No filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any court or governmental authority or agency is necessary or required for the performance by each of the Company and the Guarantors of their respective obligations hereunder, in connection with the offering, issuance or sale of the Securities hereunder or the consummation of the transactions contemplated by this Agreement or for the due execution, delivery or performance of the Indenture by the Company, except such as have been already obtained or as may be required under the 1933 Act or the 1933 Act Regulations or state securities laws and except for the qualification of the Indenture under the 1939 Act. (xxi) Possession of Licenses and Permits. The Company and its subsidiaries possess such permits, licenses, approvals, consents and other authorizations (collectively, "Governmental Licenses") issued by the appropriate federal, state, local or foreign 8 regulatory agencies or bodies necessary to conduct the business now operated by them, except where the failure so to possess would not, singly or in the aggregate, result in a Material Adverse Effect; the Company and its subsidiaries are in compliance with the terms and conditions of all such Governmental Licenses, except where the failure so to comply would not, singly or in the aggregate, result in a Material Adverse Effect; all of the Governmental Licenses are valid and in full force and effect, except where the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect would not, singly or in the aggregate, result in a Material Adverse Effect; and neither the Company nor any of its subsidiaries have received any written notice of proceedings relating to the revocation or modification of any such Governmental Licenses which, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would result in a Material Adverse Effect. (xxii) Title to Property. The Company and its subsidiaries have good and marketable title to all real property owned by the Company and its subsidiaries, including, without limitation, all oil and gas producing properties, and good title to all other properties owned by them, including, without limitation, all assets and facilities used by the Company and its subsidiaries in the production and marketing of oil and gas, in each case, free and clear of all mortgages, pledges, liens, security interests, claims, restrictions or encumbrances of any kind except such as (a) are described in the Prospectus or (b) do not, singly or in the aggregate, materially affect the value of such property and do not interfere with the use made and proposed to be made of such property by the Company or any of its subsidiaries; and all of the leases and subleases material to the business of the Company and its subsidiaries, considered as one enterprise, and under which the Company or any of its subsidiaries holds properties described in the Prospectus, including, without limitation, all oil and gas producing properties of the Company and its subsidiaries and all assets and facilities used by the Company and its subsidiaries in the production and marketing of oil and gas, are in full force and effect, except where such would not have a Material Adverse Effect, and neither the Company nor any subsidiary of the Company has any written notice of any material claim of any sort that has been asserted by anyone adverse to the rights of the Company or any of its subsidiaries under any of the leases or subleases mentioned above, or affecting or questioning the rights of the Company or such subsidiary to the continued possession of the leased or subleased premises under any such lease or sublease, except where such would not have a Material Adverse Effect. (xxiii) Environmental Laws. Except as described in the Registration Statement and except as would not, singly or in the aggregate, result in a Material Adverse Effect, (A) neither the Company nor any of its subsidiaries is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products, asbestos-containing materials or mold (collectively, "Hazardous Materials") or 9 to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, "Environmental Laws"), (B) the Company and its subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements, (C) there are no pending or, to the knowledge of the Company or the Guarantors, threatened administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigation or proceedings relating to any Environmental Law against the Company or any of its subsidiaries and (D) there are no events or circumstances that would reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or governmental body or agency, against or affecting the Company or any of its subsidiaries relating to Hazardous Materials or any Environmental Laws. (xxiv) Independent Petroleum Engineers. Cawley, Gillespie & Associates, Inc., whose report as of December 31, 2004 was, as of the date of such report, and is, as of the date hereof, an independent petroleum engineer with respect to the Company and its subsidiaries. R.A. Lenser & Associates, Inc., whose report as of December 31, 2004 was, as of the date of such report, and is, as of the date hereof, an independent petroleum engineer with respect to the Company and its subsidiaries. Ryder Scott Company, L.P., whose report as of December 31, 2004, was, as of the date of such report, and is, as of the date hereof, an independent petroleum engineer with respect to the Company and its subsidiaries. (xxv) Accuracy of Reserve Information. The information underlying the estimates of reserves of the Company and its subsidiaries, which was supplied by the Company to Cawley, Gillespie & Associates, Inc., R.A. Lenser & Associates, Inc. and Ryder Scott Company, L.P. for purposes of auditing the reserve reports and estimates of the Company and preparing the respective letters (the "Reserve Report Letters" and each a "Reserve Report Letter") of each of Cawley, Gillespie & Associates, Inc., R.A. Lenser & Associates, Inc. and Ryder Scott Company, L.P., including, without limitation, production, costs of operation and development, current prices for production, agreements relating to current and future operations and sales of production, was true and correct in all material respects on the dates such estimates were made and such information was supplied and was prepared in accordance with customary industry practices; other than normal production of the reserves and intervening spot market product price fluctuations described in the Prospectus, neither the Company nor its subsidiaries are aware of any facts or circumstances that would result in an adverse change in the reserves, or the present value of future net cash flows therefrom, as described in the Prospectus and as reflected in each Reserve Report Letter, that would reasonably be expected to result in a Material Adverse Effect; estimates of such reserves and present values as described in the Prospectus and reflected in each Reserve Report Letter comply in all material respects with the applicable requirements of Regulation S-X and Industry Guide 2 under the 1933 Act. (xxvi) Oil and Gas Agreements. The participation agreements, joint development agreements, joint operating agreements, farm-out agreements and other agreements described in the Prospectus relating to the Company's or its subsidiaries' 10 rights with respect to the ownership, lease or operation of oil and gas properties, the acquisition of interests in oil and gas properties or the exploration for, development of or production of oil and gas reserves thereon, constitute valid and binding agreements of the Company and its subsidiaries that are parties thereto and, to the best knowledge of the Company, of the other parties thereto, enforceable in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or similar laws affecting enforcement of creditors' rights generally and except as enforcement thereof is subject to general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law). (xxvii) Insurance. The Company and each of its subsidiaries maintain insurance covering their properties, operations, personnel and businesses that, in the Company's reasonable judgment, insures against such losses and risks as are adequate in accordance with customary industry practices to protect the Company and its subsidiaries and their businesses. (xxviii) Internal Controls. (a) The Company and each of its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurance that (i) transactions are executed in accordance with management's general or specific authorizations, (ii) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain asset accountability, (iii) access to assets is permitted only in accordance with management's general or specific authorization and (iv) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences. (b) The Company has established and maintains disclosure controls and procedures (as such term is defined in Rule 13a-15 under the Exchange Act), and such disclosure controls and procedures are effective in all material respects to perform the functions for which they were established. (c) Since the date of the most recent balance sheet of the Company and its consolidated subsidiaries reviewed or audited by Deloitte & Touche LLP and the audit committee of the board of directors of the Company, (i) the Company has not been advised of (A) any significant deficiencies in the design or operation of internal control over financial reporting that are reasonably likely to adversely affect the ability of the Company to record, process, summarize and report financial data and (B) any fraud, whether or not material, that involves management or other employees who have a significant role in the Company's internal control over financial reporting, and (ii) since that date, there has been no change in the Company's internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company's internal control over financial reporting. 11 (b) Officer's Certificates. Any certificate signed by any officer of the Company or any of its subsidiaries delivered to the Representatives or to counsel for the Underwriters shall be deemed a representation and warranty by the Company to each Underwriter as to the matters covered thereby. SECTION 2. Sale and Delivery to Underwriters; Closing. (a) Securities. On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to sell to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to purchase from the Company, at the price set forth in Schedule B, the aggregate principal amount of Securities set forth in Schedule A opposite the name of such Underwriter, plus any additional principal amount of Securities which such Underwriter may become obligated to purchase pursuant to the provisions of Section 10 hereof. (b) Payment. Payment of the purchase price for, and delivery of a global certificate for, the Securities shall be made at the offices of the Company, 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, or at such other place as shall be agreed upon by the Representatives and the Company, at 9:00 A.M. (Eastern time) on the third (fourth, if the pricing occurs after 4:30 P.M. (Eastern time) on any given day) business day after the date hereof (unless postponed in accordance with the provisions of Section 10), or such other time not later than ten business days after such date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called "Closing Time"). Payment shall be made to the Company by wire transfer of immediately available funds to a bank account designated by the Company, against delivery of the Securities to Merrill Lynch for the respective accounts of the Underwriters through the facilities of DTC. It is understood that each Underwriter has authorized the Representatives, for its account, to accept delivery of, receipt for, and make payment of the purchase price for, the Securities which it has agreed to purchase. Merrill Lynch, individually and not as representative of the Underwriters, may (but shall not be obligated to) make payment of the purchase price for the Securities to be purchased by any Underwriter whose funds have not been received by the Closing Time, but such payment shall not relieve such Underwriter from its obligations hereunder. (c) Denominations; Registration. The Securities shall be in global form, registered in the name of Cede & Co., as nominee of DTC. SECTION 3. Covenants of the Company. The Company covenants with each Underwriter as follows: (a) Compliance with Securities Regulations and Commission Requests. The Company, subject to Section 3(b), will notify the Representatives immediately, and confirm the notice in writing, (i) when any post-effective amendment to the Registration Statement shall become effective, or any supplement to the Prospectus or any amended Prospectus shall have been filed, (ii) of the receipt of any comments from the Commission with respect to the Registration Statement, (iii) of any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or any document 12 incorporated by reference therein or for additional information, and (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any order preventing or suspending the use of any preliminary prospectus, or of the suspension of the qualification of the Securities for offering or sale in any jurisdiction, or of the initiation or threatening of any proceedings for any of such purposes. The Company will promptly effect the filings necessary pursuant to Rule 424(b) and will take such steps as it deems necessary to ascertain promptly whether the form of prospectus transmitted for filing under Rule 424(b) was received for filing by the Commission and, in the event that it was not, it will promptly file such prospectus. The Company will make every reasonable effort to prevent the issuance of any stop order and, if any stop order is issued, to obtain the lifting thereof at the earliest possible moment. (b) Filing of Amendments. The Company will give the Representatives notice of its intention to file or prepare any amendment to the Registration Statement (including any filing under Rule 462(b)) or any amendment, supplement or revision to either the prospectus included in the Registration Statement at the time it became effective or to the Prospectus, whether pursuant to the 1933 Act, the 1934 Act or otherwise, will furnish the Representatives with copies of any such documents a reasonable amount of time prior to such proposed filing or use, as the case may be, and will not file or use any such document to which the Representatives or counsel for the Underwriters shall reasonably object. (c) Delivery of Registration Statements. The Company has furnished or will deliver to the Representatives and counsel for the Underwriters, without charge, copies (one of which shall be manually signed) of the Registration Statement as originally filed and of each amendment thereto (including exhibits filed therewith or incorporated by reference therein) and copies (one of which shall be manually signed) of all consents and certificates of experts, and will also deliver to the Representatives, without charge, a conformed copy of the Registration Statement as originally filed and of each amendment thereto (without exhibits) for each of the Underwriters. The copies of the Registration Statement and each amendment thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T. (d) Delivery of Prospectuses. The Company has delivered to each Underwriter, without charge, as many copies of each preliminary prospectus as such Underwriter reasonably requested, and the Company hereby consents to the use of such copies for purposes permitted by the 1933 Act. The Company will furnish to each Underwriter, without charge, during the period when the Prospectus is required to be delivered under the 1933 Act, such number of copies of the Prospectus (as amended or supplemented) as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T. (e) Continued Compliance with Securities Laws. The Company will comply with the 1933 Act and the 1933 Act Regulations, the 1934 Act and the 1934 Act Regulations and the 1939 Act and the 1939 Act Regulations so as to permit the completion of the distribution of the Securities as contemplated in this Agreement and in the Prospectus. If at any time when a prospectus is required by the 1933 Act to be delivered in connection with sales of the Securities, any event shall occur or condition shall exist as a result of which it is necessary, in the 13 reasonable opinion of counsel for the Underwriters or for the Company, to amend the Registration Statement or amend or supplement the Prospectus in order that the Prospectus will not include any untrue statements of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the light of the circumstances existing at the time it is delivered to a purchaser, or if it shall be necessary, in the reasonable opinion of such counsel, at any such time to amend the Registration Statement or amend or supplement the Prospectus in order to comply with the requirements of the 1933 Act or the 1933 Act Regulations, the Company will promptly prepare and file with the Commission, subject to Section 3(b), such amendment or supplement as may be necessary to correct such statement or omission or to make the Registration Statement or the Prospectus comply with such requirements, and the Company will furnish to the Underwriters such number of copies of such amendment or supplement as the Underwriters may reasonably request. (f) Blue Sky Qualifications. The Company will use its best efforts, in cooperation with the Underwriters, to qualify the Securities for offering and sale under the applicable securities laws of such states and other jurisdictions (domestic or foreign) as the Representatives may designate and to maintain such qualifications in effect for a period of not less than one year from the later of the effective date of the Registration Statement and any Rule 462(b) Registration Statement; provided, however, that the Company shall not be obligated to file any general consent to service of process or to qualify as a foreign corporation or as a dealer in securities in any jurisdiction in which it is not so qualified or to subject itself to taxation in respect of doing business in any jurisdiction in which it is not otherwise so subject and provided, further, that the Company shall not be obligated to cause the Securities to be listed on any non-U.S. securities exchange. The Company will also supply the Underwriters with such information as is necessary for the determination of the legality of the Securities for investment under the laws of such jurisdictions as the Underwriters may request. (g) Rating of Securities. The Company shall take all reasonable action necessary to enable Standard & Poor's Ratings Services, a division of The McGraw Hill Companies, Inc. ("S&P"), and Moody's Investors Service, Inc. ("Moody's") to provide their respective credit ratings of the Securities. (h) DTC. The Company will cooperate with the Representatives and use its best efforts to permit the Securities to be eligible for clearance and settlement through the facilities of DTC. (i) Rule 158. The Company will timely file such reports pursuant to the 1934 Act as are necessary in order to make generally available to its securityholders as soon as practicable an earnings statement for the purposes of, and to provide the benefits contemplated by, the last paragraph of Section 11(a) of the 1933 Act. (j) Use of Proceeds. The Company will use the net proceeds received by it from the sale of the Securities in the manner specified in the Prospectus under "Use of Proceeds". (k) Restriction on Sale of Securities. During a period of 90 days from the date of the Prospectus, the Company will not, without the prior written consent of Merrill Lynch, directly or indirectly, issue, sell, offer or contract to sell, grant any option for the sale of, or otherwise 14 transfer or dispose of, any debt securities of the Company or securities of the Company that are convertible into, or exchangeable for, the Securities or such other debt securities, excluding any borrowings under Whiting Oil and Gas's credit agreement, as such credit agreement may be amended from time to time. (l) Reporting Requirements. The Company, during the period when the Prospectus is required to be delivered under the 1933 Act, will file all documents required to be filed with the Commission pursuant to the 1934 Act within the time periods required by the 1934 Act and the 1934 Act Regulations and in accordance with the requirements of the Indenture. SECTION 4. Payment of Expenses. (a) Expenses. The Company will pay all expenses incident to the performance of its obligations under this Agreement, including (i) the preparation, printing and filing of the Registration Statement (including financial statements and exhibits) as originally filed and of each amendment thereto, (ii) the reproduction and delivery to the Underwriters of this Agreement, any Agreement among Underwriters, the Indenture and such other documents as may be required in connection with the offering, purchase, sale, issuance or delivery of the Securities, (iii) the preparation, issuance and delivery of the certificates for the Securities to the Underwriters, including any transfer taxes, any stamp or other duties payable upon the sale, issuance and delivery of the Securities to the Underwriters and any charges of DTC in connection therewith, (iv) the fees and disbursements of the Company's counsel, accountants and other advisors, (v) the qualification of the Securities under securities laws in accordance with the provisions of Section 3(f) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection therewith and in connection with the preparation of the Blue Sky Survey and any supplement thereto (provided that counsel fees in connection therewith do not exceed $5,000), (vi) the printing and delivery to the Underwriters of copies of each preliminary prospectus and of the Prospectus and any amendments or supplements thereto, (vii) the fees and expenses of the Trustee, including the fees and disbursements of counsel for the Trustee in connection with the Indenture and the Securities, (viii) the costs and expenses of the Company relating to investor presentations on any "road show" undertaken in connection with the marketing of the Securities, including without limitation, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations, travel and lodging expenses of the representatives and officers of the Company and any such consultants, and the cost of aircraft and other transportation chartered in connection with the road show, (ix) any fees payable in connection with the rating of the Securities, and (x) the filing fees incident to, and the reasonable fees and disbursements of counsel to the Underwriters in connection with, the review by the National Association of Securities Dealers, Inc. (the "NASD") of the terms of the sale of the Securities. (b) Termination of Agreement. If this Agreement is terminated by the Representatives in accordance with the provisions of Section 5 or Section 9(a)(i) hereof, the Company shall reimburse the Underwriters for all of their out-of-pocket expenses, up to $200,000, including the reasonable fees and disbursements of counsel for the Underwriters. SECTION 5. Conditions of Underwriters' Obligations. The obligations of the several Underwriters hereunder are subject to the accuracy of the representations and warranties of the 15 Company and the Guarantors contained in Section 1 hereof or in certificates of any officer of the Company or any of its subsidiaries delivered pursuant to the provisions hereof, to the performance by the Company of its covenants and other obligations hereunder, and to the following further conditions: (a) Effectiveness of Registration Statement. The Registration Statement, including any Rule 462(b) Registration Statement, has become effective and at Closing Time no stop order suspending the effectiveness of the Registration Statement shall have been issued under the 1933 Act or proceedings therefor initiated or threatened by the Commission, and any request on the part of the Commission for additional information shall have been complied with to the reasonable satisfaction of counsel to the Underwriters. A prospectus supplement reflecting the terms of the Securities, the terms of the offering thereof and the other matters set forth therein has been prepared and will be filed pursuant to Rule 424 of the 1933 Act Regulations. (b) Opinion of Counsel for Company. At Closing Time, the Representatives shall have received the favorable opinion, dated as of Closing Time, in form and substance reasonably satisfactory to counsel for the Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters, of each of (i) Foley & Lardner LLP, counsel for the Company to the effect set forth in Exhibit A hereto, and (ii) Welborn Sullivan Meck & Tooley, P.C., counsel for the Company to the effect set forth in Exhibit B hereto. (c) Opinion of Counsel for Underwriters. At Closing Time, the Representatives shall have received the favorable opinion, dated as of Closing Time, of Vinson & Elkins L.L.P., counsel for the Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters with respect to the matters set forth in clauses (i), (ii), (vi) through (xii), inclusive, and the penultimate paragraph of Exhibit A hereto. In giving such opinion such counsel may rely, as to all matters governed by the laws of jurisdictions other than the law of the State of New York, the federal law of the United States and the General Corporation Law of the State of Delaware, upon the opinions of counsel satisfactory to the Representatives. Such counsel may also state that, insofar as such opinion involves factual matters, they have relied, to the extent they deem proper, upon certificates of officers of the Company and its subsidiaries and certificates of public officials. (d) Officers' Certificate. At Closing Time, there shall not have been, since the date hereof or since the respective dates as of which information is given in the Prospectus, any material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company, the Guarantors and each subsidiary of the Guarantors considered as one enterprise, whether or not arising in the ordinary course of business, and the Representatives shall have received a certificate of the President or a Vice President of the Company and of the chief financial or chief accounting officer of the Company, dated as of Closing Time, to the effect that (i) there has been no such material adverse change, (ii) the representations and warranties in Section 1(a) hereof are true and correct with the same force and effect as though expressly made at and as of Closing Time, (iii) each of the Company and the Guarantors has complied in all material respects with all agreements and satisfied all conditions on its part to be performed or satisfied at or prior to Closing Time, and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no 16 proceedings for that purpose have been instituted or are pending or, to their knowledge, contemplated by the Commission. (e) Accountant's Comfort Letter. At the time of the execution of this Agreement, the Representatives shall have received from Deloitte & Touche LLP a letter dated such date, in form and substance satisfactory to the Representatives, together with signed or reproduced copies of such letter for each of the other Underwriters containing statements and information of the type ordinarily included in accountants' "comfort letters" to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement and the Prospectus. (f) Bring-down Comfort Letter. At Closing Time, the Representatives shall have received from Deloitte & Touche LLP a letter, dated as of Closing Time, to the effect that they reaffirm the statements made in the letter furnished pursuant to subsection (e) of this Section, except that the specified date referred to shall be a date not more than three business days prior to Closing Time. (g) Maintenance of Rating. At Closing Time, the Securities shall be rated at least B2 by Moody's and B- by S&P, and the Company shall have delivered to the Representatives a letter dated the Closing Time, from each such rating agency, or other evidence satisfactory to the Representatives, confirming that the Securities have such ratings; and from the date of this Agreement until Closing Time, there shall not have occurred a downgrading in the rating assigned to the Securities or any of the Company's other debt securities by any "nationally recognized statistical rating agency", as that term is defined by the Commission for purposes of Rule 436(g)(2) under the 1933 Act, and no such organization shall have publicly announced that it has under surveillance or review its rating of the Securities or any of the Company's other debt securities. (h) No Objection. The NASD shall have confirmed that it has not raised any objection with respect to the fairness and reasonableness of the underwriting terms and arrangements. (i) Additional Documents. At Closing Time, counsel for the Underwriters shall have been furnished with such documents and opinions as they may reasonably require for the purpose of enabling them to pass upon the issuance and sale of the Securities as herein contemplated, or in order to evidence the accuracy of any of the representations or warranties, or the fulfillment of any of the conditions, herein contained; and all proceedings taken by the Company in connection with the issuance and sale of the Securities as herein contemplated shall be reasonably satisfactory in form and substance to the Representatives and counsel for the Underwriters. (j) Termination of Agreement. If any condition specified in this Section shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representatives by notice to the Company at any time at or prior to Closing Time, and such termination shall be without liability of any party to any other party except as provided in Section 4 and except that Sections 1, 6, 7 and 8 shall survive any such termination and remain in full force and effect. 17 SECTION 6. Indemnification. (a) Indemnification of Underwriters. (1) Each of the Company and the Guarantors agree to jointly and severally indemnify and hold harmless each Underwriter, its affiliates, as such term is defined in Rule 501(b) under the 1933 Act (each, an "Affiliate"), its selling agents and each person, if any, who controls any Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act as follows: (i) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, arising out of any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment thereto) or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading or arising out of any untrue statement or alleged untrue statement of a material fact contained in any preliminary prospectus or the Prospectus (or any amendment or supplement thereto), or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading; (ii) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, to the extent of the aggregate amount paid in settlement of any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or of any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission; provided that (subject to Section 6(d) below) any such settlement is effected with the written consent of the Company; and (iii) against any and all expense whatsoever, as incurred (including the fees and disbursements of counsel chosen by Merrill Lynch), reasonably incurred in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission, to the extent that any such expense is not paid under (i) or (ii) above; provided, however, that this indemnity agreement shall not apply to any loss, liability, claim, damage or expense to the extent arising out of any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with written information furnished to the Company by any Underwriter through Merrill Lynch expressly for use in the Registration Statement (or any amendment thereto), including any preliminary prospectus or the Prospectus (or any amendment or supplement thereto) provided, further, that this indemnity agreement shall not inure to the benefit of any Underwriter or any person who controls such Underwriter on account of any such loss, liability, claim, damage or expense arising out of any such defect or alleged defect in any preliminary prospectus if a copy of the Prospectus shall not have been given or sent by such Underwriter with or prior to the written confirmation of the sale involved to the extent that (i) the Prospectus would have cured such defect or alleged defect and (ii) sufficient quantities of the Prospectus were timely made available to such Underwriter. 18 (b) Indemnification of Company and the Guarantors. Each Underwriter severally agrees to indemnify and hold harmless the Company, the Guarantors, their directors, each of their officers who signed the Registration Statement, and each person, if any, who controls the Company or any Guarantor within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act against any and all loss, liability, claim, damage and expense described in the indemnity contained in subsection (a)(1) of this Section, as incurred, but only with respect to untrue statements or omissions, or alleged untrue statements or omissions, made in the Registration Statement (or any amendment thereto) or any preliminary prospectus or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with written information furnished to the Company by such Underwriter through Merrill Lynch expressly for use in the Registration Statement (or any amendment thereto) or such preliminary prospectus or the Prospectus (or any amendment or supplement thereto). (c) Actions against Parties; Notification. Each indemnified party shall give notice as promptly as reasonably practicable to each indemnifying party of any action commenced against it in respect of which indemnity may be sought hereunder, but failure to so notify an indemnifying party shall not relieve such indemnifying party from any liability hereunder to the extent it is not materially prejudiced as a result thereof and in any event shall not relieve it from any liability which it may have otherwise than on account of this indemnity agreement. In the case of parties indemnified pursuant to Section 6(a)(1) above, counsel to the indemnified parties shall be selected by Merrill Lynch, and, in the case of parties indemnified pursuant to Section 6(b) above, counsel to the indemnified parties shall be selected by the Company. An indemnifying party may participate at its own expense in the defense of any such action; provided, however, that counsel to the indemnifying party shall not (except with the consent of the indemnified party) also be counsel to the indemnified party. In no event shall the indemnifying parties be liable for fees and expenses of more than one counsel (in addition to any local counsel) separate from their own counsel for all indemnified parties in connection with any one action or separate but similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances. In addition, the indemnifying party shall be entitled, to the extent that it wishes, jointly with any other similarly notified indemnifying party, to assume the defense of any claim or action brought against an indemnified party with counsel reasonably satisfactory to the indemnified party. After notice from the indemnifying party to the indemnified party of its election to assume the defense of such claim or action, the indemnifying party shall not be liable to the indemnified party under this Section 6 for any legal or other expenses subsequently incurred by the indemnified party in connection with the defense thereof other than reasonable costs of investigation; provided, however, that the Representatives shall have the right to employ one counsel (in addition to local counsel) to represent them and those other Underwriters and their respective officers, employees and controlling persons who may be subject to liability arising out of any claim in respect of which indemnity may be sought by the Underwriters against the indemnifying party under this Section 6 if, in the reasonable judgment of the Representatives, either (i) there is an actual or potential conflict between the position of the indemnifying party on the one hand and the Underwriters on the other hand or (ii) there may be defenses available to it or them that are different from or additional to those available to the indemnifying party (in any of which events the indemnifying party shall not have the right to direct the defense of such action on behalf of the Representatives with respect to such different defenses), in any of which events such reasonable fees and expenses shall be borne by the indemnifying party. No indemnifying party shall, without the prior written consent of the 19 indemnified parties, settle or compromise or consent to the entry of any judgment with respect to any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever in respect of which indemnification or contribution could be sought under this Section 6 or Section 7 hereof (whether or not the indemnified parties are actual or potential parties thereto), unless such settlement, compromise or consent (i) includes an unconditional release of each indemnified party from all liability arising out of such litigation, investigation, proceeding or claim and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party. (d) Settlement without Consent if Failure to Reimburse. If at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel, such indemnifying party agrees that it shall be liable for any settlement of the nature contemplated by Section 6(a), (ii) effected without its written consent if (i) such settlement is entered into more than 45 days after receipt by such indemnifying party of the aforesaid request, (ii) such indemnifying party shall have received notice of the terms of such settlement at least 30 days prior to such settlement being entered into and (iii) such indemnifying party shall not have reimbursed such indemnified party in accordance with such request prior to the date of such settlement. SECTION 7. Contribution. If the indemnification provided for in Section 6 hereof is for any reason unavailable to or insufficient to hold harmless an indemnified party in respect of any losses, liabilities, claims, damages or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount of such losses, liabilities, claims, damages and expenses incurred by such indemnified party, as incurred, (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and the Underwriters on the other hand from the offering of the Securities pursuant to this Agreement or (ii) if the allocation provided by clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company on the one hand and of the Underwriters on the other hand in connection with the statements or omissions which resulted in such losses, liabilities, claims, damages or expenses, as well as any other relevant equitable considerations. The relative benefits received by the Company on the one hand and the Underwriters on the other hand in connection with the offering of the Securities pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Securities pursuant to this Agreement (before deducting expenses) received by the Company and the total underwriting discount received by the Underwriters, in each case as set forth on the cover of the Prospectus bear to the aggregate initial public offering price of the Securities as set forth on the cover of the Prospectus. The relative fault of the Company on the one hand and the Underwriters on the other hand shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company or by the Underwriters and the parties' relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission. 20 The Company and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 7 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this Section 7. The aggregate amount of losses, liabilities, claims, damages and expenses incurred by an indemnified party and referred to above in this Section 7 shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue or alleged untrue statement or omission or alleged omission. Notwithstanding the provisions of this Section 7, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of any such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. For purposes of this Section 7, each person, if any, who controls an Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act and each Underwriter's Affiliates and selling agents shall have the same rights to contribution as such Underwriter, and each director of the Company and the Guarantors, each officer of the Company and the Guarantors who signed the Registration Statement, and each person, if any, who controls the Company within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act shall have the same rights to contribution as the Company and the Guarantors. The Underwriters' respective obligations to contribute pursuant to this Section 7 are several in proportion to the principal amount of Securities set forth opposite their respective names in Schedule A hereto and not joint. SECTION 8. Representations, Warranties and Agreements to Survive. All representations, warranties and agreements contained in this Agreement or in certificates of officers of the Company or any of its subsidiaries submitted pursuant hereto, shall remain operative and in full force and effect regardless of (i) any investigation made by or on behalf of any Underwriter or its Affiliates or selling agents, any person controlling any Underwriter, its officers or directors or any person controlling the Company and the Guarantors, and (ii) delivery of and payment for the Securities. 21 SECTION 9. Termination of Agreement. (a) Termination; General. The Representatives may terminate this Agreement, by notice to the Company, at any time at or prior to Closing Time (i) if there has been, since the time of execution of this Agreement or since the respective dates as of which information is given in the Prospectus (exclusive of any amendments or supplements thereto subsequent to the date of this Agreement), any material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company, the Guarantors and the subsidiaries of the Guarantors considered as one enterprise, whether or not arising in the ordinary course of business, or (ii) if there has occurred after the date hereof and prior to the Closing Time any material adverse change in the financial markets in the United States or the international financial markets, any outbreak of hostilities or escalation thereof or other calamity or crisis or any change or development involving a prospective change in national or international political, financial or economic conditions, in each case the effect of which is such as to make it, in the reasonable judgment of the Representatives, impracticable or inadvisable to market the Securities or to enforce contracts for the sale of the Securities, or (iii) if trading in any securities of the Company has been suspended or materially limited by the Commission or the New York Stock Exchange, or if trading generally on the American Stock Exchange or the New York Stock Exchange or in the Nasdaq National Market has been suspended or materially limited, or minimum or maximum prices for trading have been fixed, or maximum ranges for prices have been required, by any of said exchanges or by such system or by order of the Commission, the NASD or any other governmental authority, or (iv) a material disruption has occurred in commercial banking or securities settlement or clearance services in the United States, or (v) if a banking moratorium has been declared by either Federal or New York authorities. (b) Liabilities. If this Agreement is terminated pursuant to this Section, such termination shall be without liability of any party to any other party except as provided in Section 4 hereof, and provided further that Sections 1, 6, 7 and 8 shall survive such termination and remain in full force and effect. SECTION 10. Default by One or More of the Underwriters. If one or more of the Underwriters shall fail at Closing Time to purchase the Securities which it or they are obligated to purchase under this Agreement (the "Defaulted Securities"), the Representatives shall have the right, within 24 hours thereafter, to make arrangements for one or more of the non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Securities in such amounts as may be agreed upon and upon the terms herein set forth; if, however, the Representatives shall not have completed such arrangements within such 24-hour period, then: (a) if the principal amount of Defaulted Securities does not exceed 10% of the aggregate principal amount of the Securities to be purchased hereunder, each of the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations hereunder bear to the underwriting obligations of all nondefaulting Underwriters, or 22 (b) if the principal amount of Defaulted Securities exceeds 10% of the aggregate principal amount of the Securities to be purchased hereunder, this Agreement shall terminate without liability on the part of any nondefaulting Underwriter. No action taken pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default. In the event of any such default which does not result in a termination of this Agreement, either the Representatives or the Company shall have the right to postpone Closing Time for a period not exceeding seven days in order to effect any required changes in the Registration Statement or Prospectus or in any other documents or arrangements. As used herein, the term "Underwriter" includes any person substituted for an Underwriter under this Section 10. SECTION 11. Tax Disclosure. Notwithstanding any other provision of this Agreement, immediately upon commencement of discussions with respect to the transactions contemplated hereby, the Company (and each employee, representative or other agent of the Company) may disclose to any and all persons, without limitation of any kind, the tax treatment and tax structure of the transactions contemplated by this Agreement and all materials of any kind (including opinions or other tax analyses) that are provided to the Company relating to such tax treatment and tax structure. For purposes of the foregoing, the term "tax treatment" is the purported or claimed federal income tax treatment of the transactions contemplated hereby, and the term "tax structure" includes any fact that may be relevant to understanding the purported or claimed federal income tax treatment of the transactions contemplated hereby. SECTION 12. Notices. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be directed to the Representatives, c/o Merrill Lynch & Co. at 1 Houston Center, 1221 McKinney Street, Suite 2700, Houston, Texas, attention of Chris Mize; and notices to the Company and the Guarantors shall be directed to them at 1700 Broadway, Suite 2300, Denver, Colorado 80290-2300, attention of James J. Volker. SECTION 13. Parties. This Agreement shall inure to the benefit of and be binding upon the Underwriters and the Company and the Guarantors and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the Underwriters and the Company and the Guarantors and their respective successors and the controlling persons and officers and directors referred to in Sections 6 and 7 and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. This Agreement and all conditions and provisions hereof are intended to be for the sole and exclusive benefit of the Underwriters and the Company and the Guarantors and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Securities from any Underwriter shall be deemed to be a successor by reason merely of such purchase. 23 SECTION 14. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. SECTION 15. TIME. TIME SHALL BE OF THE ESSENCE OF THIS AGREEMENT. EXCEPT AS OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME. SECTION 16. Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Agreement. SECTION 17. Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof. 24 If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement between the Underwriters, the Company and the Guarantors in accordance with its terms. Very truly yours, WHITING PETROLEUM CORPORATION By: /s/ James J. Volker ------------------------------------- James J. Volker, Chairman, Chief Executive Officer and President WHITING OIL AND GAS CORPORATION By: /s/ James J. Volker ------------------------------------- James J. Volker, Chairman, Chief Executive Officer and President WHITING PROGRAMS, INC. By: /s/ James J. Volker ------------------------------------- James J. Volker, Chairman, Chief Executive Officer and President EQUITY OIL COMPANY By: /s/ James J. Volker ------------------------------------- James J. Volker, Chairman, Chief Executive Officer and President 25 CONFIRMED AND ACCEPTED, as of the date first above written: MERRILL LYNCH & CO. 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. as Representatives of the several Underwriters By: MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED By /s/ Christopher D. Mize ------------------------------- Authorized Signatory For themselves and as Representatives of the other Underwriters named in Schedule A hereto. 26 ================================================================================ SCHEDULE A Principal Amount of Name of Underwriter Securities - -------------------------------------------------------------------- ------------- Merrill Lynch, Pierce, Fenner & Smith Incorporated.................. $ 71,500,000 Lehman Brothers Inc. ............................................... $ 49,500,000 Banc of America Securities LLC...................................... $ 22,000,000 J.P. Morgan Securities Inc. ........................................ $ 22,000,000 Wachovia Capital Markets, LLC....................................... $ 11,000,000 A.G. Edwards & Sons, Inc. .......................................... $ 11,000,000 KeyBanc Capital Markets, a Division of McDonald Investments Inc. ... $ 11,000,000 Petrie Parkman & Co., Inc. ......................................... $ 11,000,000 Raymond James & Associates, Inc. ................................... $ 11,000,000 ------------- Total............................................................... $ 220,000,000 ============= ================================================================================ Sch A-1 ================================================================================ SCHEDULE B WHITING PETROLEUM CORPORATION $220,000,000 7 1/4% Senior Subordinated Notes due 2013 1. The initial public offering price of the Securities shall be 98.507% of the principal amount thereof, plus accrued interest, if any, from the date of issuance. 2. The purchase price to be paid by the Underwriters for the Securities shall be 97.007% of the principal amount thereof, plus accrued interest, if any, from the date of issuance. 3. The interest rate on the Securities shall be 7.25% per annum. ================================================================================ Sch B-1 EXHIBIT A FORM OF OPINION OF FOLEY & LARDNER TO BE DELIVERED PURSUANT TO SECTION 5(b) (i) The Company and the Guarantors have been duly incorporated (other than Equity Oil Company, as to which such counsel is not required to express any opinion) and are validly existing as corporations in good standing under the laws of their respective jurisdictions of incorporation. (ii) Each of the Company and the Guarantors has corporate power and authority to own, lease and operate its properties and to conduct its business as described in the Prospectus and to enter into and perform its obligations under the Purchase Agreement and the Indenture. (iii) The Company is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect. (iv) The authorized, issued and outstanding capital stock of the Company is as set forth in the Prospectus in the column entitled "Actual" under the caption "Capitalization" (except for subsequent issuances, if any, pursuant to reservations, agreements or employee benefit plans referred to in the Prospectus, or pursuant to the exercise of convertible securities or options referred to in the Prospectus). (v) The Purchase Agreement has been duly authorized, executed and delivered by the Company and each Guarantor. (vi) The Indenture has been duly authorized, executed and delivered by the Company and each Guarantor and (assuming the due authorization, execution and delivery thereof by the Trustee) constitutes a valid and binding agreement of the Company and each Guarantor, enforceable against the Company and each Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or other similar laws relating to or affecting enforcement of creditors' rights generally, or by general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law). (vii) The Securities are substantially in the form contemplated by the Indenture, have been duly authorized by the Company and, when executed by the Company and authenticated by the Trustee in the manner provided in the Indenture (assuming the due authorization, execution and delivery of the Indenture by the Trustee) and issued and delivered against payment of the purchase price therefor will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium (including, without limitation, all laws relating to fraudulent transfers) or other similar laws relating to or affecting enforcement of creditors' rights generally, or by general principles of A-1 equity (regardless of whether enforcement is considered in a proceeding in equity or at law), and will be entitled to the benefits of the Indenture. (viii) The Indenture has been duly qualified under the 1939 Act. (ix) The Guaranties have been duly authorized by the Guarantors and, when the Securities have been executed by the Company and authenticated by the Trustee in the manner provided in the Indenture (assuming the due authorization, execution and delivery of the Indenture by the Trustee) and issued and delivered against payment of the purchase price therefor, the Guaranty of each Guarantor will constitute valid and binding obligations of such Guarantor, enforceable against such Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or other similar laws relating to or affecting enforcement of creditors' rights generally, or by general principles of equity (regardless of whether enforcement is considered in a proceeding in equity or at law), and will be entitled to the benefits of the Indenture. (x) The Securities, the Guaranties and the Indenture conform in all material respects to the descriptions thereof contained in the Prospectus. (xi) The Registration Statement, including any Rule 462(b) Registration Statement, has been declared effective under the 1933 Act; any required filing of the Prospectus pursuant to Rule 424(b) has been made in the manner and within the time period required by Rule 424(b); and, to the best of our knowledge, no stop order suspending the effectiveness of the Registration Statement or any Rule 462(b) Registration Statement has been issued under the 1933 Act and no proceedings for that purpose have been instituted or are pending or threatened by the Commission. (xii) The Registration Statement, including any Rule 462(b) Registration Statement, the Prospectus, excluding the documents incorporated by reference therein, and each amendment or supplement to the Registration Statement and Prospectus, excluding the documents incorporated by reference therein, as of their respective effective or issue dates (other than the financial statements, financial data and supporting schedules included therein or omitted therefrom, and the Trustee's Statement of Eligibility on Form T-1 (the "Form T-1"), as to which we need express no opinion) complied as to form in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations. (xiii) The documents incorporated by reference in the Prospectus (other than the financial statements, financial data and supporting schedules included therein or omitted therefrom, as to which we need express no opinion), when they were filed with the Commission, complied as to form in all material respects with the requirements of the 1934 Act and the rules and regulations of the Commission thereunder. (xiv) The information in the Prospectus under "Description of Notes," "Description of Debt Securities," "Description of Capital Stock," "Description of Warrants" and "Description of Stock Purchase Contracts and Stock Purchase Units," in the Registration Statement under Item 15 and incorporated in the Prospectus by reference to the Company's annual report on Form A-2 10-K under "Business--Environmental Regulations", to the extent that it constitutes matters of law, summaries of legal matters, the Company's charter and bylaws or legal proceedings, or legal conclusions, has been reviewed by us and is correct in all material respects. (xv) No filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any domestic court or governmental authority or agency (other than under the 1933 Act and the 1933 Act Regulations, which have been made or obtained, or as may be required under (a) the securities or blue sky laws of the various states and (b) the Natural Gas Act of 1938, the Natural Gas Policy Act of 1978, the Natural Gas Wellhead Decontrol Act, the Outer Continental Shelf Lands Act and the Interstate Commerce Act and the rules, regulations and orders of the FERC and the Minerals Management Service, as the case may be, under such Acts (collectively, the "Gas and Oil Acts and Regulations"), as to which, in each case, we express no opinion in this paragraph (xv)) is necessary or required in connection with the due authorization, execution and delivery of the Purchase Agreement or the due execution, delivery or performance of the Indenture by the Company and the Guarantors or for the offering, issuance, sale or delivery of the Securities pursuant to the Purchase Agreement or the consummation of the transactions contemplated by the Purchase Agreement. (xvi) Except with respect to the retirement, redemption or payment by the Company or any affiliate of the Company of any part of the principal of the Securities at any time prior to the termination of all commitments and the payment and performance in full of all obligations under Whiting Oil and Gas' credit agreement, the execution, delivery and performance of the DTC Agreement, the Purchase Agreement, the Indenture and the Securities and the consummation of the transactions contemplated in the Purchase Agreement and in the Registration Statement (including the issuance and sale of the Securities pursuant to the Purchase Agreement and the use of the proceeds from the sale of the Securities as described in the Prospectus under the caption "Use of Proceeds") and compliance by the Company and the Guarantors with their obligations under the Purchase Agreement, the Indenture and the Securities do not and will not, whether with or without the giving of notice or lapse of time or both, conflict with or constitute a breach of, or default or Repayment Event (as defined in Section 1(a)(xiv) of the Purchase Agreement) under or, except as set forth in the Registration Statement, result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company or the Guarantors pursuant to those agreements identified in Schedule I to this opinion (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not have a Material Adverse Effect), nor will such action result in any violation of the provisions of the charter or bylaws of the Company or the Guarantors, or any applicable law, statute, rule, regulation, judgment, order, writ or decree, known to us (other than Gas and Oil Acts and Regulations, as to which, in each case, we express no opinion), of any U.S. government, government instrumentality or court, having jurisdiction over the Company or the Guarantors or any of their respective properties, assets or operations. (xvii) The Company is not required, and upon the issuance and sale of the Securities as herein contemplated and the application of the net proceeds therefrom as described in the Prospectus will not be required to, register as an "investment company" under the 1940 Act. A-3 Nothing has come to our attention that would lead us to believe that the Registration Statement or any amendment thereto (except for financial statements and schedules and other financial data included or incorporated by reference therein or omitted therefrom and the Form T-1, as to which we make no statement), at the time such Registration Statement or any such amendment became effective, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading or that the Prospectus or any amendment or supplement thereto (except for financial statements and schedules and other financial data included or incorporated by reference therein or omitted therefrom and the Form T-1, as to which we make no statement), at the time the Prospectus was issued, at the time any such amended or supplemented Prospectus was issued or at the Closing Time, included or includes an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. In rendering such opinion, such counsel may rely as to matters of fact (but not as to legal conclusions), to the extent they deem proper, on certificates of responsible officers of the Company and public officials. In giving such opinion such counsel may, as to all matters governed by the laws of jurisdictions other than the law of the State of Wisconsin, the federal law of the United States, and the General Corporation Law of the State of Delaware, assume that the applicable laws of such other jurisdictions are identical in all relevant respects to the substantive laws of the State of Wisconsin. Such opinion shall not state that it is to be governed or qualified by, or that it is otherwise subject to, any treatise, written policy or other document relating to legal opinions, including, without limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991). A-4 SCHEDULE I 1. Second Amended and Restated Credit Agreement, dated as of September 23, 2004, among Whiting Oil and Gas Corporation, Whiting Petroleum Corporation, the financial institutions listed therein and Bank One, NA, as Administrative Agent. 2. First Amendment to Second Amended and Restated Credit Agreement dated as of April 11, 2005, by and among Whiting Oil and Gas Corporation, Whiting Petroleum Corporation, JP Morgan Chase Bank, N.A., as Administrative Agent, and each of the financial institutions party thereto as Banks. 3. Whiting Petroleum Corporation 2003 Equity Incentive Plan. 4. Whiting Oil and Gas Corporation Production Participation Plan, as Amended and Restated as of April 23, 2004. 5. Indenture, dated as of May 11, 2004, by and among Whiting Petroleum Corporation, Whiting Oil and Gas Corporation, Whiting Programs, Inc. and J.P. Morgan Trust Company, National Association, as Trustee. A-5 EXHIBIT B FORM OF OPINION OF WELBORN SULLIVAN MECK & TOOLEY, P.C. TO BE DELIVERED PURSUANT TO SECTION 5(b) (i) Each Guarantor is duly qualified as a foreign corporation to transact business and is in good standing in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure so to qualify or to be in good standing would not result in a Material Adverse Effect. Except as otherwise disclosed in the Registration Statement, all of the issued and outstanding capital stock of each Guarantor has been duly authorized and validly issued, is fully paid and non-assessable and, to the best of our knowledge, is owned by the Company, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity; and, to the best of our knowledge, none of the outstanding shares of capital stock of any Guarantor was issued in violation of the preemptive or similar rights of any securityholder of such Guarantor. (ii) To the best of our knowledge, there is not pending or threatened any action, suit, proceeding, inquiry or investigation, to which the Company, the Guarantors or any subsidiary is a party, or to which the property of the Company, the Guarantors or any subsidiary is subject, before or brought by any domestic court or governmental agency or body, which would reasonably be expected to result in a Material Adverse Effect, or which would reasonably be expected to materially and adversely affect the properties or assets thereof or the consummation of the transactions contemplated in the Purchase Agreement or the performance by the Company or the Guarantors or any of their respective obligations thereunder or the transactions contemplated by the Prospectus. (iii) All descriptions in the Registration Statement of contracts and other documents to which the Company or any of its subsidiaries are a party (excluding the Indenture and the Purchase Agreement) are, to the best of our knowledge, accurate in all material respects; to the best of our knowledge, there are no franchises, contracts, indentures, mortgages, loan agreements, notes, leases or other instruments required to be described or referred to in the Registration Statement or to be filed as exhibits to the Registration Statement other than those described or referred to therein or filed as incorporated by reference as exhibits thereto, and the descriptions thereof or references thereto are correct in all material respects. (iv) The information incorporated in the Prospectus by reference to the Company's annual report on Form 10-K under "Business -- Regulation", and "Business--Title to Properties", to the extent that it constitutes matters of law, summaries of legal matters or legal proceedings, or legal conclusions, has been reviewed by us and is correct in all material respects. (v) No filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any domestic court or governmental authority or agency pursuant to the Natural Gas Act of 1938, the Natural Gas Policy Act of 1978, the Natural Gas Wellhead Decontrol Act, the Outer Continental Shelf Lands Act and the Interstate Commerce Act and the rules, regulations and orders of the FERC and the Minerals Management Service, as the case B-1 may be, under such Acts is necessary or required in connection with the due authorization, execution or delivery of the Purchase Agreement or for the offering sale or delivery of the Securities. (vi) The execution, delivery and performance of the DTC Agreement, Purchase Agreement, the Indenture and the Securities and the consummation of the transactions contemplated in the Purchase Agreement and in the Registration Statement (including the issuance and sale of the Securities pursuant to the Purchase Agreement and the use of proceeds from the sale of the Securities as described in the Prospectus under the caption "Use of Proceeds") and compliance by the Company and the Guarantors with their obligations under the Purchase Agreement, the Indenture and the Securities do not and will not, whether with or without the giving of notice or lapse of time or both, conflict with or constitute a breach of, or default or Repayment Event (as defined in Section 1(a)(xiv) of the Purchase Agreement) under or result in the creation or imposition of any lien, charge or encumbrance upon any property or assets of the Company, the Guarantors or any subsidiary of the Company pursuant to any contract, indenture, mortgage, deed of trust, loan or credit agreement, note, lease or any other agreement or instrument, known to us, to which the Company, the Guarantors or any subsidiary of the Company is a party or by which it or any of them may be bound, or to which any of the property or assets of the Company, the Guarantors or any subsidiary of the Company is subject (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not have a Material Adverse Effect), nor will such action result in any violation of the provisions of the charter or bylaws of the Company, the Guarantors or any subsidiary of the Company, or any applicable law, statute, rule, regulation, judgment, order, writ or decree, known to us, of any U.S. government, government instrumentality or court, having jurisdiction over the Company, the Guarantors or any subsidiary of the Company, the Guarantors or any of their respective properties, assets or operations. Nothing has come to our attention that would lead us to believe that the Registration Statement or any amendment thereto (except for financial statements and schedules and other financial data included therein or omitted therefrom, as to which we make no statement), at the time such Registration Statement or any such amendment became effective, contained an untrue statement of a material fact or omitted to state a material fact required to be stated therein or necessary to make the statements therein not misleading or that the Prospectus or any amendment or supplement thereto (except for financial statements and schedules and other financial data included therein or omitted therefrom, as to which we make no statement), at the time the Prospectus was issued, at the time any such amended or supplemented prospectus was issued or at the Closing Time, included or includes an untrue statement of a material fact or omitted or omits to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading. In rendering such opinion, such counsel may rely, as to matters of fact (but not as to legal conclusions), to the extent they deem proper, on certificates of responsible officers of the Company and public officials. In giving such opinion such counsel may, as to all matters governed by the laws of jurisdictions other than the law of the State of Colorado, the federal law of the United States, and the General Corporation Law of the State of Delaware, assume that the applicable laws of such other jurisdictions are identical in all relevant respects to the substantive laws of the State of Colorado. Such opinion shall not state that it is to be governed or qualified B-2 by, or that it is otherwise subject to, any treatise, written policy or other document relating to legal opinions, including, without limitation, the Legal Opinion Accord of the ABA Section of Business Law (1991). B-3