Chesapeake Energy Corp., Oklahoma City, (NYSE: CPR) plans to acquire 32% of the interest in privately held Oklahoma City-based Chaparral Energy Inc. for $280 million. Chaparral has properties in Oklahoma, Texas, Kansas, Arkansas and New Mexico, with total production of 82.8 million cubic feet of gas per day. Proved reserves are 33.9 million barrels of oil and 414.4 billion cubic feet of gas for a total 617.9 billion cubic feet of gas equivalent.