聚合物驱后储层物性参数的变化特征

通过室内实验，对聚合物驱后储层岩心孔渗参数、孔隙结构以及渗流特征进行了研究，总结了储层物性参数变化特征及对渗流特征的影响。研究结果表明，长期实施聚合物驱后，聚合物在岩心孔隙空间中的吸附和滞留作用对渗透率的影响要大于聚合物溶液对孔隙的冲刷所产生的影响。地层多孔介质中受聚合物对岩石的冲刷作用影响最大的是少数较大孔隙，聚合物对地层的影响作用是非均质的。相对渗透率曲线的变化显示了聚合物的选择作用，聚合物吸附对水相相对渗透率的影响要大于对油相相对渗透率的影响。

Variations of physical property parameters of reservoirs after polymer flooding

Porosity-permeability,pore structure and percolation features of reservoir cores after polymer flooding are studied by laboratory experiments.The variation of physical property parameters of reservoir and its impact on the percolation is summarized.Studies show that after long-term polymer flooding,the effect of absorption and detention of the polymer in core pore space on the permeability is stronger than the effect of scouring of the polymer solution on pores.The impact of the polymer on the formations is heterogeneous,which means that only a few larger pores are strongly influenced by the polymer scouring of the rock in porous media.The change of relative permeability curve clearly shows the selective impact of the polymer on oil and water,that is,the effect of the polymer adsorption upon water relative permeability is greater than that on oil relative permeability.