1. College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
2. Chongqing University of Science & Technology, Chongqing, 401331 Chongqing, China
3. Engineering Research Center of Oilfield Chemistry, Ministry of Education, Chengdu 610500, P. R. China
4. Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu 610500, P. R. China