exv99w3

Exhibit 99.3

UNAUDITED PRO FORMA FINANCIAL STATEMENTS

On October 4, 2005, Whiting Petroleum Corporation (the “Company”) completed its acquisition of the operated interest in the North Ward Estes field in the Permian Basin of West Texas and certain other fields (“North Ward Estes and Ancillary Properties”) from Celero Energy, LP (“Celero”). The purchase price for the North Ward Estes and Ancillary Properties was approximately $459.2 million, which was comprised of $442 million in cash and 441,500 shares of the Company’s common stock. On August 4, 2005, the Company completed its acquisition of the operated interest in the Postle field in Texas County, Oklahoma (the “Postle Properties”) from Celero for $343 million in cash. The effective date of both purchases was July 1, 2005.

During 2005, the Company also completed two other property acquisitions (collectively, “Other Properties”). On March 31, 2005, the Company acquired operated interests in five producing gas fields in the Green River Basin of Wyoming for a purchase price of $65 million, which was funded by borrowings under the Company’s credit agreement. On June 23, 2005, the Company acquired all of the limited partnership interests in three institutional partnerships, having properties in Louisiana, Texas, Arkansas, Oklahoma and Wyoming, for a purchase price of $30.5 million, which was funded using cash on hand.

The following unaudited pro forma financial information shows the pro forma effects of i) the consummation of the North Ward Estes and Ancillary Properties acquisition, ii) the public offering of 6,612,500 shares of the Company’s common stock that closed on October 4, 2005 (the “Common Stock Offering”), iii) the private placement of $250 million of the Company’s senior subordinated notes that also closed on October 4, 2005 (the “Senior Subordinated Notes Private Placement”), iv) the use of the net proceeds from the Common Stock Offering and Senior Subordinated Notes Private Placement to pay the remaining cash portion of the purchase price for the North Ward Estes and Ancillary Properties and related fees and expenses, and v) the use of the remaining net proceeds from the Common Stock Offering and Senior Subordinated Notes Private Placement to repay $100 million of the Company’s debt under its credit facility (collectively, the “Transactions”).

The unaudited pro forma combined statement of operations for the nine months ended September 30, 2005 was prepared as if the Transactions and the acquisitions of the Postle Properties and Other Properties all occurred on January 1, 2005 and includes the pro forma results of the Postle Properties through August 4, 2005 and the pro forma results of the Other Properties from January 1, 2005 up to their respective acquisition dates. The unaudited pro forma combined statement of operations for the year ended December 31, 2004 was prepared as if the Transactions and the acquisitions of the Postle Properties and Other Properties all occurred at January 1, 2004. The unaudited pro forma combined balance sheet as of September 30, 2005 assumes that the Transactions all occurred on September 30, 2005. The Company’s historical results include the results from its recent acquisitions beginning on the following dates: Green River Basin of Wyoming, March 31, 2005; limited partnership interests, June 23, 2005; and Postle Properties, August 4, 2005.

The pro forma financial information also includes the effects of the Company’s $1.2 billion bank credit agreement, which was entered into on August 31, 2005 in connection with the acquisitions of the North Ward Estes and Ancillary Properties and the Postle Properties. The credit agreement had an initial borrowing base of $675 million, which increased to $850 million upon the closing of the North Ward Estes and Ancillary Properties and was then offset by a reduction of $62.5 million upon the closing of the Senior Subordinated Notes Private Placement, thereby resulting in a borrowing base of $787.5 million.

of direct revenues and operating expenses, which in turn have been derived from the historical accounting records of the sellers and prior operators and which do not include all costs of doing business. Although the statements do not include depreciation, depletion and amortization, general administrative expenses, income taxes or interest expense, as described in Notes 3 and 4, these costs have been included on a pro forma basis. The pro forma statements of operations, however, are not necessarily indicative of the Company’s operations going forward, because these statements necessarily exclude various operating expenses attributable to the North Ward Estes and Ancillary Properties and the Postle Properties.

The unaudited pro forma combined financial statements reflect pro forma adjustments that are described in the accompanying notes and are based on available information and certain assumptions we believe are reasonable but are subject to change. In our opinion, all adjustments that are necessary to present fairly the pro forma information have been made. The following unaudited pro forma financial statements do not purport to represent what the Company’s financial position or results of operations would have been if the Transactions or the acquisitions of the Postle Properties or Other Properties had occurred on September 30, 2005, January 1, 2005 or January 1, 2004, respectively. These unaudited pro forma financial statements should be read in conjunction with the Company’s historical financial statements and related notes for the periods presented.

UNAUDITED CONDENSED PRO FORMA COMBINED BALANCE SHEET
AS OF SEPTEMBER 30, 2005 (in thousands, except share and per share data)


	Whiting			North Ward
	Petroleum			Estes and			Pro Forma
	Corporation			Ancillary			Combined
	September 30,			Properties			September 30,
	2005			(Note 2)			2005
ASSETS
TOTAL CURRENT ASSETS	$	127,102		$	25,394		$	152,496


PROPERTY AND EQUIPMENT:
Oil and gas properties, successful efforts method:
Proved properties		1,775,915			463,340			2,239,255
Unproved properties		18,553			—			18,553
Deposit on North Ward Estes acquisition		45,900			(45,900	)		—
Other property and equipment		13,911			—			13,911

Total property and equipment		1,854,279			417,440			2,271,719
Less accumulated depreciation, depletion and amortization		(306,911	)		—			(306,911	)

Total property and equipment, net		1,547,368			417,440			1,964,808


DEBT ISSUANCE COSTS		19,124			5,500			24,624

OTHER LONG-TERM ASSETS		11,781			—			11,781


TOTAL	$	1,705,375		$	448,334		$	2,153,709


LIABILITIES AND STOCKHOLDERS’ EQUITY

TOTAL CURRENT LIABILITIES	$	159,075		$	—		$	159,075

ASSET RETIREMENT OBLIGATIONS		36,891			4,164			41,055

PRODUCTION PARTICIPATION PLAN LIABILITY		11,457			—			11,457

TAX SHARING LIABILITY		28,826			—			28,826

LONG-TERM DEBT		735,623			150,000			885,623

DEFERRED INCOME TAXES		63,452			—			63,452

LONG-TERM DERIVATIVE LIABILITY		34,053			—			34,053

STOCKHOLDERS’ EQUITY:
Common stock, $.001 par value; 75,000,000 shares authorized, 29,788,723 shares issued and outstanding as of September 30, 2005 (36,842,723 shares issued and outstanding on a combined pro forma basis)		30			7			37
Additional paid-in capital		458,837			294,163			753,000
Accumulated other comprehensive loss		(63,198	)		—			(63,198	)
Deferred compensation		(2,707	)		—			(2,707	)
Retained earnings		243,036			—			243,036

Total stockholders’ equity		635,998			294,170			930,168


TOTAL	$	1,705,375		$	448,334		$	2,153,709

See accompanying notes to unaudited pro forma combined financial statements.

UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS FOR THE
NINE MONTHS ENDED SEPTEMBER 30, 2005 (in thousands, except per share data)


	Whiting					North Ward
	Petroleum			Postle		Estes and
	Corporation			Properties		Ancillary
	Nine Months			January 1,		Properties Nine							Pro Forma
	Ended			2005 to August 4,		Months Ended		Other		Pro Forma			Combined
	September 30,			2005		September 30,		Properties		Adjustments			September 30,
	2005			(Note 1)		2005 (Note 1)		(Note 1)		(Note 3)			2005
REVENUES
Oil and gas sales	$	374,829		$	46,075	$	56,061	$	8,721		—		$	485,686
Loss on oil and gas hedging activities		(20,689	)		—		—		—		—			(20,689	)
Interest income and other		319			—		—		—		—			319

Total revenues		354,459			46,075		56,061		8,721		—			465,316


COSTS AND EXPENSES:
Lease operating		70,732			11,065		13,395		1,999		—			97,191
Production taxes		24,558			3,218		3,849		475		—			32,100
Depreciation, depletion and amortization		64,400			—		—		—		18,104			82,504
Exploration and impairment		11,999			—		—		—		—			11,999
General and administrative		21,636			—		—		—		176			21,812
Interest expense		25,018			—		—		—		20,555			45,573

Total costs and expenses		218,343			14,283		17,244		2,474		38,835			291,179


INCOME BEFORE INCOME TAXES		136,116		$	31,792	$	38,817	$	6,247		(38,835	)		174,137


INCOME TAX EXPENSE		(52,541	)								(14,676	)		(67,217	)


NET INCOME	$	83,575								$	(53,511	)	$	106,920


NET INCOME PER COMMON SHARE, BASIC	$	2.82											$	2.91

NET INCOME PER COMMON SHARE, DILUTED	$	2.81											$	2.91

WEIGHTED AVERAGE SHARES OUTSTANDING, BASIC		29,688									7,054			36,742

WEIGHTED AVERAGE SHARES OUTSTANDING, DILUTED		29,705									7,054			36,759

See accompanying notes to unaudited pro forma combined financial statements.

UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS FOR
THE YEAR ENDED DECEMBER 31, 2004 (in thousands, except per share data)


						North Ward
	Whiting					Estes and		Other
	Petroleum			Postle		Ancillary		Properties
	Corporation			Properties		Properties		Year Ended					Pro Forma
	Year Ended			Year Ended		Year Ended		December 31,		Pro Forma			Combined
	December 31,			December 31,		December 31,		2004		Adjustments			December 31,
	2004			2004 (Note1)		2004 (Note 1)		(Note 1)		(Note 4)			2004
REVENUES
Oil and gas sales	$	281,057		$	60,703	$	37,620	$	23,147	$	—		$	402,527
Loss on oil and gas hedging activities		(4,875	)		—		—		—		—			(4,875	)
Gain on sale of marketable securities		4,835			—		—		—		—			4,835
Gain on sale of oil and gas properties		1,000			—		—		—		—			1,000
Interest income and other		123			—		—		—		—			123

Total revenues		282,140			60,703		37,620		23,147		—			403,610


COSTS AND EXPENSES:

Lease operating		54,212			14,610		11,036		5,011		—			84,869
Production taxes		16,793			3,115		2,176		1,997		—			24,081
Depreciation, depletion and amortization		54,010			—		—		—		27,795			81,805
Exploration and impairment		6,329			—		—		—		—			6,329
General and administrative		20,935			—		—		—		235			21,170
Interest expense		15,856			—		—		—		34,900			50,756

Total costs and expenses		168,135			17,725		13,212		7,008		62,930			269,010


INCOME BEFORE INCOME TAXES		114,005		$	42,978	$	24,408	$	16,139		(62,930	)		134,600


INCOME TAX EXPENSE		(43,959	)								(7,950	)		(51,909	)


NET INCOME	$	70,046								$	(70,880	)	$	82,691


NET INCOME PER COMMON SHARE, BASIC	$	3.38											$	2.98

NET INCOME PER COMMON SHARE, DILUTED	$	3.38											$	2.97


WEIGHTED AVERAGE SHARES OUTSTANDING, BASIC		20,735									7,054			27,789

WEIGHTED AVERAGE SHARES OUTSTANDING, DILUTED		20,768									7,054			27,822

See accompanying notes to unaudited pro forma combined financial statements.

NOTES TO THE UNAUDITED PRO FORMA FINANCIAL STATEMENTS

1. BASIS OF PRESENTATION

During 2005, the Company also completed two other property acquisitions (collectively, “Other Properties”). On March 31, 2005, the Company acquired operated interests in five producing gas fields in the Green River Basin of Wyoming for a purchase price of $65 million (“Green River Basin”), which was funded by borrowings under the Company’s credit agreement. On June 23, 2005, the Company acquired all of the limited partnership interests in three institutional partnerships, having properties in Louisiana, Texas, Arkansas, Oklahoma and Wyoming, for a purchase price of $30.5 million, which was funded using cash on hand.

The following unaudited pro forma financial information shows the pro forma effects of i) the consummation of the North Ward Estes and Ancillary Properties acquisition, ii) the offering of 6,612,500 shares of the Company’s common stock that closed on October 4, 2005 (the “Common Stock Offering”), iii) the private placement of $250 million of the Company’s senior subordinated notes that also closed on October 4, 2005 (the “Senior Subordinated Notes Private Placement”), iv) the use of the net proceeds from the Common Stock Offering and Senior Subordinated Notes Private Placement to pay the remaining cash portion of the purchase price for the North Ward Estes and Ancillary Properties and related fees and expenses, and v) the use of the remaining net proceeds from the Common Stock Offering and Senior Subordinated Notes Private Placement to repay $100 million of the Company’s debt under its credit facility (collectively, the “Transactions”).

The unaudited pro forma combined statement of operations for the nine months ended September 30, 2005 was prepared as if the Transactions and the acquisitions of the Postle Properties and Other Properties all occurred on January 1, 2005 and includes the pro forma results of the Postle Properties through August 4, 2005 and the pro forma results of the Other Properties from January 1, 2005 up to their respective acquisition dates. The unaudited pro forma combined statement of operations for the for the year ended December 31, 2004 was prepared as if the Transactions and the acquisitions of the Postle Properties and Other Properties all occurred at January 1, 2004. The unaudited pro forma combined balance sheet as of September 30, 2005 assumes that the Transactions all occurred on September 30, 2005. The Company’s historical results include the results from its recent acquisitions beginning on the following dates: Green River Basin of Wyoming, March 31, 2005; limited partnership interests, June 23, 2005; and Postle Properties, August 4, 2005.

The Company has prepared the unaudited combined pro forma financial statements to give effect to the following:

•

the sale of 6,612,500 shares of the Company’s common stock at the public offering price of $43.60 per share, generating net proceeds of approximately $277.0 million, after deducting approximately $11.3 million of estimated offering related fees and expenses, including the underwriting discount and commissions; and

•

the sale of $250 million aggregate principal amount of the Company’s senior subordinated notes maturing in 2014 bearing interest at 7%, generating net proceeds of approximately $244.5 million, after deducting approximately $5.5 million of estimated offering related fees and expenses, including the underwriting discount and commissions.

The historical financial information for the Postle Properties and the North Ward Estes and Ancillary Properties, which is presented in the unaudited pro forma combined statements of operations for the nine months ended September 30, 2005 and the year ended December 31, 2004, has been derived from statements of direct revenues and operating expenses, which in turn have been derived from the historical accounting records of the sellers and prior operators and which do not include all costs of doing business. Although the statements do not include depreciation, depletion and amortization, general administrative expenses, income taxes or interest expense, as described in Notes 3 and 4, these costs have been included on a pro forma basis. The pro forma statements of operations, however, are not necessarily indicative of the Company’s operations going forward, because these statements necessarily exclude various operating expenses attributable to the North Ward Estes and Ancillary Properties and the Postle Properties.

The Company believes that the assumptions used provide a reasonable basis for presenting the significant effects directly attributable to such transactions.

These unaudited pro forma financial statements do not purport to represent what the Company’s financial position or results of operations would have been if the Transactions or the acquisitions of the Postle Properties or Other Properties had occurred on September 30, 2005, January 1, 2005 or January 1, 2004, respectively. These unaudited pro forma financial statements should be read in conjunction with the Company’s historical financial statements and related notes for the periods presented.

Earnings Per Share — Basic net income per common share of stock is calculated by dividing net income by the weighted average of common shares outstanding during each period. Diluted net income per common share of stock is calculated by dividing net income by the weighted average of common shares outstanding and other dilutive securities. The only securities considered dilutive are unvested restricted stock awards.

2. PRO FORMA ADJUSTMENTS TO THE BALANCE SHEET AS OF SEPTEMBER 30, 2005

The following adjustments have been made to the accompanying unaudited condensed pro forma balance sheet as of September 30, 2005:

Current Assets — To reflect the net cash remaining from the aggregate Common Stock Offering and Senior Subordinated Notes Private Placement proceeds of $521.5 million, after i) the remaining cash portion of $396.1 million for the North Ward Estes and Ancillary Properties purchase was funded, and ii) repayment of $100 million in debt under the Company’s credit facility.

Proved Properties — To record the acquisition of the North Ward Estes and Ancillary Properties for a purchase price of approximately $459.2 million, and to also record the estimated asset retirement cost of $4.2 million related to the properties acquired.

Deposit On North Ward Estes Acquisition — To reclassify the $45.9 million purchase price deposit paid in August 2005 to proved properties upon the closing of the North Ward Estes and Ancillary Properties acquisition on October 4, 2005.

Debt Issuance Costs — To record the capitalization of approximately $5.5 million in financing costs and related fees associated with the Senior Subordinated Notes Private Placement. The net proceeds from Senior Subordinated Notes Private Placement were used to fund the acquisition of the North Ward Estes and Ancillary Properties and to repay a portion of the Company’s debt under its credit facility.

Asset Retirement Obligations — To record the estimated asset retirement obligation related to the acquired North Ward Estes and Ancillary Properties.

Long-Term Debt —To record the $250 million aggregate principal amount due as a result of the Senior Subordinated Notes Private Placement that was used to fund the North Ward Estes and Ancillary Properties acquisition. Further, to reflect repayment of $100 million in debt under the Company’s credit facility using the net proceeds available from the Common Stock Offering and Senior Subordinated Notes Private Placement, after the North Ward Estes and Ancillary Properties acquisition was fully funded.

Additional Paid-In Capital and Common Stock — To record the issuance of 6,612,500 shares of the Company’s common stock at the public offering price of $43.60 per share, generating net proceeds of $277.0 million, after deducting approximately $11.3 million of estimated offering related fees and expenses, including the underwriting discount and commissions. To also record the Company’s issuance of 441,500 shares of the Company’s common stock to Celero at the closing of the North Ward Estes and Ancillary Properties.

3. PRO FORMA ADJUSTMENTS FOR NINE MONTHS ENDED SEPTEMBER 30, 2005

The following adjustments have been made to the accompanying unaudited condensed pro forma statement of operations for the nine months ended September 30, 2005:

Depletion, Depreciation and Amortization — To record pro forma depletion expense giving effect to the acquisition of the Postle Properties (through August 4, 2005), the North Ward Estes and Ancillary Properties, and Other Properties (through respective acquisition dates). The expense was calculated using the unit-of-production method, based on estimated proved reserves and production by field, the capitalized purchase price for each acquisition, and asset retirement costs related to the properties acquired. To also record accretion of discount expense related to the estimated asset retirement obligations for wells and facilities acquired. Accretion expense has been adjusted to reflect the Company’s credit adjusted risk free rate.

General and Administrative — To record rent expense from January 1, 2005 to September 30, 2005 for a lease contract, which the Company assumed pursuant to the terms of the North Ward Estes and Ancillary Properties purchase and sale agreement, for a field office in Midland, Texas.

Interest Expense — To record interest expense and amortization of debt issuance costs for debt incurred under the Company’s credit facility to fund the acquisitions of the Postle Properties (through August 4, 2005) and the Green River Basin (through March 31, 2005), less all repayments of debt under the credit facility relating to net proceeds remaining from the Common Stock Offering and Senior Subordinated Notes Private Placement, after the North Ward Estes and Ancillary Properties acquisition was fully funded. The Company used current interest rates for borrowings under its facility. Each 1/8% change in the credit facility interest rate would affect income before income taxes by $0.2 million for the nine months ended September 30, 2005. Further, to record interest expense and amortization of debt issuance costs and fees related to the $250 million Senior Subordinated Notes Private Placement bearing interest at 7%.

Income Taxes — To record income tax expense on pretax income from the Postle Properties (through August 4, 2005), the North Ward Estes and Ancillary Properties for the nine months ended September 30, 2005, and Other Properties (through respective acquisition dates), based on the Company’s statutory tax rate of 38.6%.

4. PRO FORMA ADJUSTMENTS FOR YEAR ENDED DECEMBER 31, 2004

The following adjustments have been made to the accompanying unaudited pro forma statement of operations for the year ended December 31, 2004:

Depletion, Depreciation and Amortization — To record pro forma depletion expense from January 1, 2004 to December 31, 2004, giving effect to the Postle Properties, the North Ward Estes and Ancillary Properties, and Other Properties acquisitions. The expense was calculated using the unit-of-production method, based on estimated proved reserves and production by field, the capitalized purchase price for each acquisition, and asset retirement costs related to the properties acquired. To also record accretion of discount expense related to the estimated asset retirement obligations for wells and facilities acquired. Accretion expense has been adjusted to reflect the Company’s credit adjusted risk free rate.

General and Administrative — To record rent expense from January 1, 2004 to December 31, 2004 for a lease contract, which the Company assumed pursuant to the terms of the North Ward Estes and Ancillary Properties purchase and sale agreement, for a field office in Midland, Texas.

Interest Expense — To record interest expense and amortization of debt issuance costs for debt incurred under the Company’s credit facility to fund the acquisitions of the Postle Properties and the Green River Basin, less all repayments of debt under the credit facility relating to net proceeds remaining from the Common Stock Offering and Senior Subordinated Notes Private Placement, after the North Ward Estes and Ancillary Properties acquisition was fully funded. The Company used current interest rates for borrowings under its facility. Each 1/8% change in the credit facility interest rate would affect income before income taxes by $0.4 million for the year ended December 31, 2004. Further, to record interest expense and amortization of debt issuance costs and fees related to the $250 million Senior Subordinated Notes Private Placement bearing interest at 7%.

Income Taxes — To record income tax expense on pretax income from the Postle Properties, the North Ward Estes and Ancillary Properties, and Other Properties, based on the Company’s statutory tax rate of 38.6%.