1. Engineering Operation Center, Hainan Branch, CNOOC Limited, Haikou 570100, China
2. China University of Petroleum (Beijing), Beijing 100000, China
3. Oilfield Chemicals R&D lnstitute, COSL, Yanjiao 065201, China
4. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China