1. Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, Qingdao 266580, China
2. Shandong Key Laboratory of Oilfield Chemistry, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
3. Exploration and Development Research Institute of Daqing Oilfield Limited Company, Daqing 163712, Heilongjiang, PR China