Southwestern Energy will be exiting Fayetteville shale through a sale of its business and related midstream assets. : Southwestern Energy Company is selling its Fayetteville Shale business and related midstream assets for $1.865 billion, the company announced Sept. 4. The company has entered into a definitive agreement with private Flywheel Energy, LLC and under the transaction will exit Fayetteville. Assets include 915,000 net acres; 4,033 operated producing wells; 3.7 Trillion cubic feet (Tcf) of proved reserves as of year-end 2017; anticipated 2019 production of 225-230 Billion cubic feet (Bcf) and associated midstream gathering infrastructure and compression.