Clayton Williams Energy Inc operates in the Crude petroleum and natural gas sector. Clayton Williams Energy, Inc. (CWEI) is an independent oil and gas company engaged in the exploration for and production of oil and natural gas primarily in Texas, Louisiana and New Mexico. On December 31, 2010, the estimated proved reserves of the Company were 51,065 million barrels of oil equivalent (MBOE), of which 68% were proved developed. The portfolio of oil and natural gas reserves is weighted in favor of oil, with approximately 74% of the proved reserves consisting of oil and natural gas liquids and approximately 26% consisting of natural gas. During the year ended December 31, 2010, CWEI added proved reserves of 23,193 MBOE through extensions and discoveries and had upward revisions of 2,282 MBOE. At December 31, 2010, CWEI held interests in 6,789 gross (1,020.7 net) producing oil and gas wells and owned leasehold interests in approximately 1million gross (535,000 net) undeveloped acres. In our complete report available for purchase the company is compared to: Breitburn Energy Partners L.P., Comstock Resources Inc and Venoco, Inc..