Operator List: O

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O'Brien Energy Resources Corp. O'Brien, Owen O'Connell, James P. O-K Gas Svcs Oak Ridge LLC Ocean Energy, Resources, Inc. Oil Partners, LLC Oil Producers, Inc. of Kansas Oil Property Management, Inc. Oil Tech Producers Corporation

Ol' Oily LLC OLAK Energy Production, LLC Olympic Oil, Inc. One Source Financial Services Inc. Oolite Energy Corp OPCO LLC Opdycke Lease Partners, a General Partnership Orca Operating Company LLC Osage Energy, LLC OSAGE Resources, LLC

Osborn Heirs Company, LTD Outlaw Well Service LLC Overland Exploration Company Owen's Pumping Service Owens Oil Company, LLC Owens Petroleum LLC Own Resources Operating LLC OXY USA Inc.