三元复合体系动态界面张力对驱油效率的影响

采用贝雷岩心开展三元体系界面张力与驱油效果之间关系的实验研究,实验结果表明,三元复合体系动态界面张力最低值越低,界面张力下降速度越快,超低界面张力作用时间越长,化学驱提高驱油效率越高。提出用超低界面张力作用指数S作为评价复合体系界面张力性能的指标,建立超低界面张力作用指数与驱油效率的关系式,得出体系界面张力和驱油效率均满足现场实际要求的复合体系的标准为S1 000。

The Influence of Dynamic Interfacial Tension of ASP system on Oil Displacement Efficiency

In this paper, experimental research was carried out to study the relationship between interfacial tension of ASP system and oil displacement effect by Berea cores. Experimental results show that, lower dynamic interfacial tension of ASP system, faster decline rate of interfacial tension and longer ultra-low interfacial tension action time contribute to a higher oil recovery of chemical flooding. Ultra-low interfacial tension effect index was proposed as an evaluation index of the interfacial tension of composite system. In addition, the relationship between ultra-low interfacial tension index and oil displacement efficiency was established. The relationship shows that, the standard of composite system whose interfacial tension and oil displacement efficiency both meet the actual requirements of Oilfield is S>1000.