关键词: 低活性剂, 浓度, 三元复合体系, 驱油效率, 数值模拟, 物理模拟

Abstract: In recent years, a few of pilot tests of alkaline-surfactant-olymer(ASP) flooding have been conducted in the Daqing Oil Field, and better flooding efficiency has been obtained. It is possible for ASP floodign to become a beneficial FOR method if volumes of chemical agency might decrease largely. In this paper, characteristics of residual oiI distribution after ASP flooding are researched by numerical calculation, in which ASP solution used in the Daqing pilot tests is also selected as flooding solution. The experimental results show that saturation differential of residual oil between area near main streamline and area far away become larger than that of water.floodign because of much higher flooding effciency from ASP solution. Taking this as basics, a group of new formulations for ASP solution have been designed by numerical calculation. The five-spot physical model with heterogeneous characteristics of the Daqing Oil Field has been used to evaluate flooding efficiency of these formulations. The experimental resuits show that ASP flooding, in which volume of chemical agency is lower than that of nomal ASP solution, has obtamed more than 5% increment of oil recovery.

Key words: lower concentration, ASP solution, flooding efficiency, numerical simulation, physical simulation