Abstract: To solve the problem of polymer plugging of polymer injection well area in the bohai sea, a kind of efficient composite depolymerization additive is screened in the paper. Laboratory experiments show that the degradation rate of 5 000 mg/L polymer solution can reach more than 99%, and the polymer scale samples with crude oil from oil well in Bohai can be degraded in 72 h because of the low interfacial tension and good oil washing effecthigh effect of washing oil. Meanwhile, the high chelating ability of this depolymerization additive is good for the depolymerization of the crosslinking polymer, and the degradation progress can be as less as 3 h.The plug removal application in one oil well well shows that the efficient depolymerization additive has remarkable capacity of enhancing liquid and oil.

Key words: Polymer pluging, Composite depolymerizing agent, Interfacial tension, Effect of washing oil, Chelating ability

摘要： 为解决渤海注聚井区聚合物堵塞问题，筛选出一种高效复合解聚剂。实验表明，该解聚剂体系具有较低的界面张力和良好的洗油效果，不仅对5 000 mg/L聚合物溶液降解率可达99%以上，而且72 h可完全降解现场含油聚合物垢样。同时，该解聚剂体系具有较高的螯合能力，有助于降解含金属离子的交联聚合物垢样，3 h可完全降解交联聚合物。在渤海某油田注聚采油井的现场解堵应用表明，该解聚剂体系具有明显的提液增油能力，解堵效果显著。

关键词: 聚合物堵塞, 复合解聚剂, 界面张力, 洗油效果, 螯合值