中高渗储层聚合物凝胶调剖机理及分布规律研究

Study on the Mechanism and Distribution of Polymer Gel Profile Control in Medium and High Permeability Reservoirs

随着油田开采进入特高含水后期,低渗透储层剩余油开采难度加大。聚合物凝胶调剖体系已经成为中高渗储层深度调剖和进一步提高采收率的重要措施。然而储层非均质性严重导致调剖体系成胶强度对调剖效果产生很大影响。因此为了使调剖体系达到“走得远”的目的,研究调剖体系调剖机理具有十分重要的意义。通过测试不同质量浓度聚合物凝胶黏度明确聚合物质量浓度对凝胶成胶强度的影响,通过注入能力实验得到不同成胶强度凝胶在中高渗储层调剖机理。

With the oilfield development entering the late stage of ultra-high water cut, it is more difficult to recover the remaining oil in low-permeability reservoirs. Polymer gel profile control system has become an important measure for deep profile control and further enhancing oil recovery in medium and high permeability reservoirs. However, the serious reservoir heterogeneity leads to that the gel forming strength of the profile control system has great impact on the profile control effect. Therefore, in order to make the profile control system "go far", it is of great significance to study the profile control mechanism of the profile control system. In this paper, the effect of polymer mass concentration on the gel forming strength of gel was clarified by testing the viscosity of polymer gel with different mass concentration. The profile control mechanism of gel with different gel forming strength in medium and high permeability reservoirs was obtained through the injection capacity experiment.