Exhibit 99.1


CLAYTON WILLIAMS ENERGY ANNOUNCES 2012 FINANCIAL RESULTS AND YEAR-END RESERVES

Midland, Texas, February 21, 2013 (BUSINESS WIRE) - Clayton Williams Energy, Inc. (the “Company”) (NASDAQ-CWEI) today reported its financial results for the quarter and year ended December 31, 2012.

Highlights

Oil and Gas Production of 5.6 Million BOE, up 3%
Total Proved Reserves of 75.4 Million BOE, up 17%
365% of 2012 Production Replaced by Reserve Additions
77% Oil and NGL and 58% Proved Developed


Financial Results for Fiscal Year 2012

Net income attributable to Company stockholders for fiscal 2012 was $35.1 million, or $2.89 per share, as compared to net income of $93.8 million, or $7.71 per share, for fiscal 2011. Cash flow from operations for 2012 was $189.2 million as compared to $280 million for 2011. The key factors affecting the comparability of the two years were:

Oil and gas sales, excluding amortized deferred revenues, decreased $10.4 million in 2012 compared to 2011. Price variances accounted for a decrease of $25.6 million, and production variances accounted for a $15.2 million increase. Average realized oil prices were $90.97 per barrel in 2012 versus $92.43 per barrel in 2011, and average realized gas prices were $3.59 per Mcf in 2012 versus $5.30 per Mcf in 2011. Oil and gas sales in 2012 also includes $8.3 million of amortized deferred revenue attributable to a volumetric production payment (“VPP”) granted effective March 1, 2012 in connection with the mergers of 24 Southwest Royalties, Inc. limited partnerships ("SWR mergers"). Reported production and related average realized sales prices exclude volumes associated with the VPP.

Oil and gas production for 2012 on a barrel of oil equivalent (“BOE”) basis was 3% higher compared to 2011. Oil production increased 3% compared to 2011, while gas production declined 6%. Oil and natural gas liquids ("NGL") production accounted for 76% of total production in 2012 versus 74% in 2011.

Production costs increased 24% to $125 million in 2012 from $101.1 million in 2011 due to a combination of an increase in the number of producing wells, higher costs of field services, including salt water disposal costs, and higher property taxes on Texas properties resulting from rising appraisal values.

Gain on derivatives for 2012 was $14.4 million ($17.8 million non-cash mark-to-market gain and a $3.4 million realized loss on settled contracts) versus a gain in 2011 of $47 million ($4.5 million non-cash mark-to-market gain and a $42.5 million realized gain on settled contracts). Cash settlements in 2011 included $50 million from the early termination of


The following information was filed by Clayton Williams Energy Inc De (CWEI) on Thursday, February 21, 2013 as an 8K 2.02 statement, which is an earnings press release pertaining to results of operations and financial condition. It may be helpful to assess the quality of management by comparing the information in the press release to the information in the accompanying 10-K Annual Report statement of earnings and operation as management may choose to highlight particular information in the press release.

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