化学驱相对渗透率曲线特征

Characteristics of relative permeability curve in chemical flooding

综合考虑聚合物吸附、滞留等因素对渗透率测定的影响,通过非稳态法分别测定聚合物驱、聚合物+表面活性剂二元驱,在不同油水黏度比和界面张力下的相对渗透率。研究发现,随着聚合物质量分数的增加,油水黏度比减小,聚合物驱水相相渗曲线、残余油饱和度及等渗点均发生相应改变。二元驱在黏度和界面张力的共同作用下,与水驱相渗曲线相比较,也存在相应变化规律。

Relative permeability curves of polymer flooding and polymer/surfactant flooding are measured respectively under different oil-water viscosity ratio and interfacial tension by using non-steady state method with consideration of polymer adsorption and hysteresis.The result of the experiments shows that,as the increasing of polymer mass fraction,the isotonic point of relative permeability curve shifts to the right,residual oil saturation becomes smaller,and ultimate recovery increases;under the same polymer mass fraction,after adding surfactant,residual oil saturation is smaller than that of polymer flooding,the relative permeability curve of water phase rises;as the increasing of surfactant mass fraction,the isotonic point shifts to the right.