Abstract: There are some shortcomings in the current delayed crosslinking methods.A novel delayed release technology using multiple emulsion crosslinking system was developed.The thermal stability and transport property of the multiple emulsion were analyzed.This crosslinking system was prepared by taking T20 as hydrophilic surfactant and T161 as the lipophilic surfactant respectively.The experimental data indicate that the multiple emulsion can meet well with the higher temperature in reservoir and propagate in the porous media with the greater velocity by 2.12 times more than the crosslinker used alone,which leads to more advisable crosslinking ability.The multiple emulsion crosslinking system was proved to be available for improving the efficiency of deep profile modification in the water-flooding oilfields with high water cut and high recovery rate.

Key words: water-flooding oilfield, multiple emulsion crosslinking system, polymer gel, deep profile modification, thermal stability, transport property

摘要： 有机延缓交联及油包水乳液延缓交联方法在实现凝胶深部调剖、改善开发效果方面存在一些不足,为此制备了多重乳液延缓交联体系,研究了其热稳定性及运移行为.这种交联体系是在柴油为油相、Cr(AC)₃交联剂为内水相、聚氧乙烯失水山梨醇单月桂酸酯(T20)为水包油乳化剂、聚异丁烯基丁二酰亚胺(T161)为油包水乳化剂的条件下制成的多重乳液延缓交联体系,具有更高的热稳定性.此外,传统Cr(AC)₃经多重乳液包覆处理后,在多孔介质中的运移能力提高2.12倍.可作为较高油藏温度条件下高含水率、高采出程度注水开发油田实施深部调剖措施的有效手段.

关键词: 注水油田, 多重乳液延缓交联体系, 聚合物凝胶, 深部调剖, 热稳定性, 运移行为