1. College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao 266061, Shandong, PR China
2. Geo-Energy Research Institute, Qingdao University of Science and Technology, Qingdao 266061, Shandong, PR China
3. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Southwest Petroleum University, Chengdu 610500, Sichuan, PR China