College of Mechanical and Electrical Engineering Guangdong University of Petrochemical Technology Maoming 525000 China;
School of Petroleum Engineering Northeast Petroleum University Daqing 163318 China;
School of Chemical Engineering Sichuan University Chengdu 610065 China;
PetroChina Daqing Oil Field Co.Ltd. Daqing 163002 China;
high water-cut oilfield; reservoir; surface-active polymer; oil-washing efficiency; swept volume; plug by emulsification; enhanced oil recovery;