Abstract: To solve the oil-water separation problem of produced fluid by surfactant-polymer binary flooding in SINOPEC Shengli Oilfield, polymethacrylic acid polyether containing cationic monomer was synthesized in the laboratory, and the oil-water separating agent RPYSF-1 for the produced fluid was then prepared. The field tests were carried out in Gusi United Station of Gudao Production Plant of Shengli Oilfield Branch of SINOPEC. The results showed that the total agent dosage decreased from 78.2 μg/g before the test to less than 50 μg/g, the water content (w) of the oil transmission was no more than 1.2%, and the mass concentration of oil in sewage was no more than 39mg /L, reaching the expected targets

Key words: surfactant-polymer binary flooding, produced fluid, oil-water separation