不同浓度二元复合体系对驱油效果的影响

近年来,水驱开发效果较差。油藏一般采取"调驱+水驱"方式取得了较好增油降水效果,但也存在药剂费用投入较高和配注工艺复杂等问题。对于强碱或者弱碱三元的复合体系中普遍存在采出液乳化和结垢的问题,优先选用聚合物和表面活性剂复合而成的二元体系,并采用室内物理模拟的方法,对比不同浓度聚/表二元体系的界面张力、黏度、驱油效果进行研究,发现聚/表二元体系可以实现超低界面张力的要求,而且聚/表二元体系的黏度也比较大,通过室内非均质岩心物理模拟实验研究,表明不同浓度的聚/表二元体系对驱油效果的影响效果差异较大。

Effect of Binary Composite System Concentration on Oil Displacement Efficiency

The effect of water flooding is poor, so combined method of profile control and water flooding is often adopted in development of oil reservoirs, which has good effect, but there are also problems such as high cost and complex injection process. In this paper, interfacial tension, viscosity and displacement effect of binary composite system with different concentrations were studied with indoor physical simulation method. The results show that the binary composite system can realize the requirement of ultra low interfacial tension. And its viscosity is also relatively large.Experimental study results on physical simulation of heterogeneous core show that the effect of different concentrations of binary composite system on oil displacement effect is relatively large.