Exhibit 12

Whiting Petroleum Corporation and Subsidiaries

Ratio of Earnings to Fixed Charges

Ratio of Earnings to Fixed Charges and Preferred Stock Dividends

(dollars in thousands)

	Six Months Ended			Year Ended December 31,
	June, 2012			2011			2010			2009			2008			2007
Fixed charges:
Interest expensed	$	31,670		$	53,834		$	48,486		$	53,582		$	59,010		$	65,977
Interest capitalized		1,432			3,574			2,920			3,406			3,129			3,664
Amortized premiums, discounts and capitalized expenses related to indebtedness		4,691			8,682			10,592			11,026			6,068			6,527
Estimate of interest within rental expense		521			883			684			603			431			424
Total fixed charges	$	38,314		$	66,973		$	62,682		$	68,617		$	68,638		$	76,592
Earnings:
Income (loss) before income taxes	$	398,725		$	780,319		$	541,443		$	(162,835	)	$	408,820		$	207,162
Income from equity investees		(260	)		(1,032	)		(1,311	)		(1,581	)		(1,625	)		(1,365	)
Fixed charges (above)		38,314			66,973			62,682			68,617			68,638			76,592
Amortization of capitalized interest		872			1,409			1,117			776			463			97
Distributed income from equity investees		381			1,533			1,323			1,780			1,175			928
Interest capitalized		(1,432	)		(3,574	)		(2,920	)		(3,406	)		(3,129	)		(3,664	)
Noncontrolling interest in pre-tax income of subsidiaries		55			59			—			—			—			—
Total earnings	$	436,655		$	845,687		$	602,334		$	(96,649	)	$	474,942		$	279,750
Ratio of earnings to fixed charges (unaudited) (1)		11.40	x		12.63	x		9.61	x		—			6.92	x		3.65	x
Fixed charges and preferred stock dividends:
Fixed charges (above)	$	38,314		$	66,973		$	62,682		$	68,617		$	68,638		$	76,592
Preferred stock dividends (2)		862			1,704			26,516			15,695			—			—
Total fixed charges and preferred stock dividends	$	39,176		$	68,677		$	89,198		$	84,312		$	68,638		$	76,592
Ratio of earnings to fixed charges and preferred stock dividends (unaudited) (3)		11.15	x		12.31	x		6.75	x		—			6.92	x		3.65	x

(1) For the year ended December 31, 2009, earnings were inadequate to cover fixed charges, and the ratio of earnings to fixed charges therefore has not been presented for that period. The coverage deficiency necessary for the ratio of earnings to fixed charges to equal 1.00x (one-to-one coverage) was $165.3 million for the year ended December 31, 2009.

(2) Preferred stock dividends represent pre-tax earnings required to cover any preferred stock dividend requirements using our effective tax rate for the relevant period.

(3) For the year ended December 31, 2009, earnings were inadequate to cover fixed charges and preferred stock dividends, and the ratio of earnings to fixed charges and preferred stock dividends therefore has not been presented for that period. The coverage deficiency necessary for the ratio of earnings to fixed charges and preferred stock dividends to equal 1.00x (one-to-one coverage) was $181.0 million for the year ended December 31, 2009.