关键词: 三元复合驱, 硅垢, 四元共聚物, 防垢剂, 防垢机理

Abstract: For the silica scale and calcium carbonate scale emerging in ASP flooding of oilfield，a quadripolymer scale inhibitor was prepared by maleic anhydride (MA)，sodium hypophosphite(NaH2PO2)，acrylamide(AM) and polyethylene glycol (PEG) 4000. The polymerization was initiated by the initiator with persulfate ammonium and sodium hydrogensulfite. The best condition was determined for the quadripolymer synthesis and its properties had been evaluated. The results show that the scale inhibit rate of silica scale is 67.2% at 60℃；the scale inhibit rate of CaCO3 is 96.3% at 70℃，when the scale inhibit dosage is 100mg/L. It is pointed out that the four kinds of functional groups in the quadripolymer scale inhibitor mechanisms of synergy are the lattice distortion and the electrostatic repulsion. Because of the high price of polyethylene glycol, looking for inexpensive biodegradable containing ether bond compounds are the main research directions of the future experiments.

Key words: ASP flooding, silica scale, quadripolymer, scale inhibitor, scale inhibit mechanism