1. Petroleum Engineering College, Yangtze University, Wuhan 430100, China
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610051, China
3. China United Coalbed Methane Company, Beijing 100011, China
4. Binnan Oil Production Plant, Shengli Oilfield Company, Sinopec, Binzhou 256600, China
5. Petroleum Engineering Department, Colorado School of Mines, Golden, Colorado 80401, United States