1. Polymer Research Institute, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, P. R. China
2. EOR Laboratory, Exploration & Development Research Institute, Daqing Oilfield Limited Company, PetroChina, Daqing 163712, China
3. EOR Laboratory, Research Institute of Experiment and Detection, Xinjiang Oilfield Branch Company, PetroChina, Karamay 834000, China