Top 20 operators in oil production over the years

If you’ve wondered what companies are tops in oil production in North Dakota, here’s the list of the top 20 operators and the sums of their cumulative oil.

The cumulative oil is the amount companies have produced going back to the discovery of oil in the state more than 60 years ago and to the present time.

Preliminary figures for the state’s oil production in November, the most recent figures available, was 21,992,345 barrels or 733,078 barrels a day, a slight drop from October and mainly because of the winter weather, according to the North Dakota Department of Mineral Resources in Bismarck.

North Dakota is No. 2 in oil production in the nation, a feat it achieved last year, and its all-time high was 749,212 barrels of oil per day in October 2012.

Following are the sums of cumulative oil for the top 20 operators. Other companies also are operating in the North Dakota oil patch. The information is provided by the N.D. Department of Mineral Resources and updated as of Thursday.

Hess Corporation 327,465,899

Whiting Oil and Gas Corp. 173,796,212

Denbury Onshore, LLC 140,381,459

Continental Resources, Inc. 130,205,244

Petro-Hunt, LLC 123,800,580

Burlington Resources Oil & Gas Co. LP 113,970,838

Amerada Hess Corp. 112,393,684

EOG Resources, Inc. 76,871,597

SM Energy Co. 75,180,729

Enduro Operating, LLC 57,738,630

Sequel Energy, LLC 45,051,477

Citation Oil & Gas Corp. 33,792,002

XTO Energy Inc. 30,837,723

Marathon Oil Co. 30,409,533

Texaco Exploration & Production Inc. 29,172,952

Slawson Exploration Co. Inc. 25,953,934

Murex Petroleum Corp. 25,860,050

Brigham Oil & Gas, L.P. 23,269,391

Encore Energy Partners Operating LLC 22,377,313

Williston Hunter ND, LLC 19,375,707

As of Friday, 187 rigs were actively drilling in the N.D. oil patch, according to the N.D. Oil and Gas Division, a divison of the N.D. Department of Mineral Resources.