1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong 266061, China
2. Geo-Energy Research Institute, Qingdao University of Science and Technology, Qingdao, Shandong 266100, China
3. College of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580, China