LABORATORY EVALUATION OF FLOODING EFFICIENCY FOR ASP SOLUTION OF LOWER SURFACTANT AND ALKALINE CONCENTRATION IN THE DAQING OIL FIELD
LABORATORY EVALUATION OF FLOODING EFFICIENCY FOR ASP SOLUTION OF LOWER SURFACTANT AND ALKALINE CONCENTRATION IN THE DAQING OIL FIELD
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作者：
L. Xiang
近年来，大庆油田开展了一些碱 - 表面活性剂 - 聚合物（ASP）驱的先导性试验，并取得了较好的驱油效果。如果化学剂用量能够大幅降低，ASP驱有可能成为一种有效的提高采收率方法。本文通过数值计算研究了ASP驱后剩余油分布特征，其中也选用了大庆先导性试验中使用的ASP溶液作为驱替液。实验结果表明，由于ASP溶液的驱油效率高得多，主流线附近区域和远离主流线区域之间的剩余油饱和度差异比水驱更大。以此为基础，通过数值计算设计了一组新的ASP溶液配方。采用具有大庆油田非均质性特征的五点法物理模型来评估这些配方的驱油效果。实验结果表明，化学剂用量低于常规ASP溶液的ASP驱提高采收率超过5%。
In recent years,a few of pilot tests of alkaline_surfactant_polymer(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 EOR method if volumes of chemical agency might decrease largely.In this paper,characteristics of residual oil 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 results show that ASP flooding,in which volume of chemical agency is lower than that of nomal ASP solution,has obtained more than 5% increment of oil recovery.