1. Center for Chemical Engineering Experimental Teaching, State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum, Qingdao Shandong Province 266580 China
2. College of Environment and ResourcesXiangtan University, Xiangtan Hunan Province 411105 China
3. Oil Production Group#2, Huabei Oil Field Company at PetroChina Hebei Province 065709 China