1. Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao 266580, China
2. Southwest Petroleum University, Chengdu 610500, China
3. Bob L. Herd Department of Petroleum Engineering, Texas Tech University, Lubbock, Texas 79409, United States
4. Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada