1. Key Laboratory of Unconventional Oil & Gas Development, China University of Petroleum (East China), Ministry of Education, Qingdao, China;
2. School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, China;
3. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao, China;
4. Department of Petroleum Engineering, Texas Tech University, Lubbock, Texas, USA