Chaparral Energy, Inc. engages in the acquisition, exploration, development, production, and operation of onshore 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. As of March 29, 2018, it had estimated potential reserves of one billion barrels of oil equivalent. The company was founded in 1988 and is headquartered in Oklahoma City, Oklahoma.