1. College of Petroleum Engineering, Liaoning Petrochemical University, Fushun, China
2. College of Chemical Engineering and Environmental Engineering, Liaoning Petrochemical University, Fushun, China
3. Shandong Natural Gas Pipeline Company, Shandong, China
4. Shandong Natural Gas Sales Center, Natural Gas Branch of China Petroleum & Chemical Corporation, Jinan Shandong, China