Operator List: W

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W & W Production Company, General Partnership W M Petroleum LLC W. R. Williams, Inc. W.D. Short Oil Co., LLC W.R.A. Oil Co. W5 Oil, LLC Wachtman-Schroeder, a General Partnership Walcher Oil, LC Walcher, Wayne E. Walker Tank Service, Inc Waller Oil, LLC Walton, Tara War Cry, LLC Warhorse Petroleum Inc Warren American Oil Company LLC Watt, Larry Watts Tank Truck Service, Inc. WCP Energy LLC Webco Oil Company, Inc. Weber Four Oil Co., Inc. Webster Oil LLC Wehmeyer, Gerald Weigel Oil Company, LLC Weinkauf Petroleum, Inc.

Wells Oil, LLC Wellwin Drilling Corporation West Place Crude, LLC West Plains Enterprises, Inc Western Operating Company Western Plains Resources LLC Westgate Oil Company, Inc. Westlake Energy Consultants, Inc. Westmore Drilling Company, Inc. Wheeler Oil Company Whitaker Companies, Inc. Whitco Petroleum, LP White & Ellis Drilling, Inc. White Exploration, Inc. White Hawk Oil Company, a General Partnership White Hawk Oil Company, LLP White Pine Petroleum Corporation White, Kenneth S. Whitetail Crude, Inc Whitlow Energy, Inc. Widrig Oil LLC Wiesner, Tom Oil Operations Wilcox Oil, LLC Wildcat Oil & Gas LLC

Wildcat Well Service Wildhorse Operating Company Wilkinson Energy LLC Williams, M. A. Williford Energy Company Wilson County Holdings LLC Wilton Petroleum, Inc. Wind River Exploration Inc. Winder Oil Company Wineland Oil - LLC Winterscheid Oil, LLC Wirtz Oil, LLC WM KS Energy Resources LLC Wood Energy, Inc. Woods Oil Woolsey Operating Company, LLC Woolsey Petroleum Corporation Wrestler, David L., a General Partnership Wrestler, Ronald D., a General Partnership Wynn-Crosby Operating, Ltd.