1. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China
2. Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
3. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
4. Petrochina Sichuan Petrochemical Co., Ltd., Chengdu 611930, P. R. China