三元复合驱合理井网、井距分析

MECHANISM OF ASP FLOODING IN DAQING OILFIELD

在深入总结大庆油田杏五区、杏二区、北一区断西等三元复合驱先导性矿场试验的基础之上，结合非均质岩心室内物理模拟实验，进行了综合研究及数值模拟理论计算工作。针对大庆油田萨中以北地区及杏北地区现有井网的实际，给出了不同地区三元复合驱合理井网、井距的原则。

This paper analyzes the changes of beared force condition of residual oil during water flooding and ASP flooding by starting from the comparison between residual oil images after water flooding and after ASP flooding and the process of residual oil displacement. The internal reason for the effect of ASP flooding on residual oil is given: the ASP system lowers the interfacial tension between oil & water and changes the media wettability. Both lead to the great drop of capillary pressure and adhensive force, even make the capillary pressure change from resistance force to flooding force. Above is the main mechanism of ASP system in displacing cylindrical and cluster residual oil. ASP system displaces film residual oil by lowering adhensive force and cohesion force. In displacing isolated residual oil, first ASP system lowers the cohesion force to enable isolated residual oil to stretch into oil thread,then break and disperse into small oil drops gradually. Small drops are liable to pass through tiny