1. School of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
2. Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil & Gas Reservoirs in West China, Ministry of Education, Xi’an, Shaanxi 710065, China
3. No.1 Oil Production Company of PetroChina Changqing Oilfield Company, Yan’an 716000, China
4. Zhongman Petroleum And Natural Gas Group Corp., Ltd., Shanghai 201306, China