Chesapeake Energy Corporation (Chesapeake) is a natural gas and oil exploration and production company. Chesapeake is engaged in the exploration, development and acquisition of properties for the production of natural gas and oil from underground reservoirs. It also provides substantial marketing, midstream, drilling and other oilfield services. Its operations are located onshore and in the continental United States. As of December 31, 2011, the Company owned interests in approximately 45,700 producing natural gas and oil wells that produced approximately 3.5 billion cubic feet of natural gas equivalent per day, net to its interest. It operates in three segments: exploration and production; marketing, gathering and compression, and oilfield services. In March 2011, it sold all of its Fayetteville Shale assets. In July 2012, it sold its interest in Chesapeake Midstream Partners, L.P. to Global Infrastructure Partners. In October 2012, it sold asset packages in the Permian Basin.