Related by context. Frequent words. (Click for all words.) 51 Whiting Petroleum 51 Brigham Exploration 50 PetroQuest 50 Newfield Exploration 49 GMXR 49 Approach Resources 49 McMoRan Exploration Co. 48 ENSCO International 48 Crimson Exploration 48 Rosetta Resources 48 Canacol 47 BPZ 47 Cimarex Energy 46 Brigham Exploration Company 46 Ascent Resources 46 Schlumberger SLB 46 Range Resources 45 Oilex 45 NYSE APC 45 Gastar Exploration Ltd. 45 Carrizo Oil & 45 GeoResources Inc. 45 EVEP 45 Intrepid Potash 45 Royale Energy 44 Petrohawk Energy Corporation 44 PXD 44 NYSE RRC 43 SWN 43 Concho Resources Inc. 43 Gulfsands 43 Energy XXI 43 BPZ Energy 43 NYSE TOT 43 Vanguard Natural Resources 43 Cheniere Energy 43 Anadarko Petroleum 43 Aminex 42 Denbury Resources 42 Gasco Energy 42 NYSE CHK 42 Comstock Resources 42 MegaWest 42 Legacy Reserves 42 Dejour 42 Whiting Petroleum Corporation 42 Ensco International 42 Unicorp 42 Woodford Shale 41 Atlas Pipeline Partners 41 Cimarex Energy Co. 41 TXCO 41 Petroflow 41 Schlumberger NYSE SLB 41 Nabors Industries 41 Magnum Hunter 41 Chevron NYSE CVX 41 Questerre 40 Shaikan 40 Transocean RIG 40 Ultra Petroleum 40 VHGI 40 Lundin Petroleum 40 Magellan Petroleum 40 BNK 40 Gastar 40 Hercules Offshore 40 EOG 40 Harvest Natural Resources 40 Hyperdynamics 40 ProspEx 40 Petroceltic 40 Merrex 40 Patterson UTI Energy 40 ConocoPhillips COP 40 MetalCORP 39 Roc Oil 39 EXCO Resources Inc. 39 EQT Corporation 39 Allis Chalmers Energy 39 Uranium Resources 39 Denbury Resources Inc. 39 SandRidge Energy 39 NYSE ECA 39 Pacific Rubiales Energy 39 Oceaneering International 39 NYSE CNX 39 Bronco Drilling 39 Hardman Resources 38 Serica 38 Halliburton HAL 38 Hercules Offshore Inc. 38 CNX Gas 38 Exxon Mobil NYSE XOM 38 Goodrich Petroleum 38 Westlake Chemical 38 NGAS 38 Helix Energy 38 Anadarko 38 GeoResources 38 Anadarko Petroleum Corp.