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

摘要： 针对油田三元复合驱过程产生的硅垢和钙垢，本文以马来酸酐、次亚磷酸钠、丙烯酰胺、聚乙二醇4000为单体，过硫酸铵-亚硫酸氢钠为引发剂，合成了一种新型四元共聚物防垢剂。确定了最佳合成条件，考察了防垢剂的防垢效果。结果表明，防垢剂加量100 mg/L、60 ℃时，测定硅垢防垢率为67.2%；70 ℃时，测定CaCO3垢防垢率为96.3%。指出四元共聚物防垢剂中的4种官能团的协同作用机理主要是晶格畸变与静电斥力作用；而由于聚乙二醇价格高，寻找价格低廉可降解的含醚键化合物是以后实验的主要研究方向。

关键词: 三元复合驱, 硅垢, 四元共聚物, 防垢剂, 防垢机理