正韵律油藏聚驱后滞留聚合物分布

Distribution of polymer residual for positive rhythm reservoir flooded with polymer

聚驱后的油层存有相当部分可动油及大量的聚合物,利用滞留聚合物开采这部分剩余油具有重要意义.在室内开展了非均质厚油层滞留聚合物分布实验及数值模拟.结果表明：即使后续水驱注入孔隙体积倍数为0.5时,油层内滞留聚合物量仍可达总注入量的50%~60%,其中,中渗透带滞留聚合物最多,占总滞留量的40%以上;随着注聚量和变异因数的增大,中渗透率层滞留聚合物增多.

Large amounts of mobile oil and polymer are left in polymer flooded reservoirs,so it is necessary to find a way to produce the residual oil with the aid of the retained polymer.This paper introduces the research on polymer distribution in heterogeneous thick oil layers and its numerical simulation.Results show nearly 50% injected polymer is left in oil layers after subsequent 0.5PV water flooding,most(>40%) of it in medium permeability layer,and with the increasing of injected polymer volume and permeability variation coefficient,the medium permeability layer's polymer retention will accumulate.