Chaparral Energy, Inc. engages in the acquisition, exploration, development, production, and operation of oil and natural gas properties primarily in Oklahoma, the United States. The company sells crude oil, natural gas, and natural gas liquids primarily to refineries and gas processing plant. Its 210,000 net surface acres are located in the Mid-Continent region, approximately 122,000 net acres are located in the STACK play primarily in Canadian, Kingfisher, and Garfield counties. As of December 31, 2019, the company's estimated proved oil and natural gas reserves were 96.6 million barrels of crude oil equivalent; and had an interest in 2,782 gross producing wells, including 866 gross company operated wells. Chaparral Energy, Inc. was founded in 1988 and is headquartered in Oklahoma City, Oklahoma.