聚合物驱不可及孔隙体积对渗流规律的影响  

Influence of inaccessible pore volume on seepage law of polymer flooding

作　　者：李爱芬[1] 宋浩鹏 谢昊君[1] 

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《油气地质与采收率》2016年第2期70-75,共6页Petroleum Geology and Recovery Efficiency

基　　金：国家科技重大专项"剩余油形成机理及定量分析方法研究"(2011ZX05014-003-006HZ);国家自然科学基金项目"粘度变化对稠油相对渗透率曲线的影响机制研究"(51274226)

摘　　要：聚合物溶液在多孔介质中流动存在不可及孔隙体积和吸附滞留现象,以往研究聚合物溶液在多孔介质中的渗流规律时,常忽略不可及孔隙体积的影响。为此,通过实验测定了聚合物驱不可及孔隙体积、聚合物溶液的流变性和在多孔介质中的有效粘度;通过建立考虑不可及孔隙体积的并联毛细管模型,分析不同渗透率岩心的不可及孔隙体积对聚合物溶液阻力系数、有效粘度、剪切速率和衰竭层效应的影响。结果表明,对聚合物累积质量曲线求导得到的不可及孔隙体积更准确;不可及孔隙体积会使聚合物溶液阻力系数和有效粘度降低,剪切速率和衰竭层厚度增加;岩心渗透率越小,不可及孔隙体积越大,对阻力系数、有效粘度、剪切速率和衰竭层厚度的计算误差越大。Inaccessible pore volume and adsorptive retention exist when polymer solution flows in porous media. The influence of inaccessible pore volume was often ignored in previous studies of the seepage law of the polymer solution in porous media. With regard to this,the inaccessible pore volume of the polymer flooding,rheological curve and effective viscosity in the porous media of the polymer solution were determined through the experiment. Parallel capillary model was established considering the influence of the inaccessible pore volume. The effect of the inaccessible pore volume of cores with different permeabilities on resistance factor,effective viscosity,shear rate and depleted layer effect of the polymer solution was analyzed. Results show that the inaccessible pore volume derived from the cumulative polymer quality curve can be more accurate. The inaccessible pore volume can lead to lower resistance factor and effective viscosity and higher shear rate and depleted layer thickness for the polymer solution. The lower the core permeability is,the larger the inaccessible pore volume will be,and a larger error will be introduced to the calculation results of resistance factor,effective viscosity,shear rate and depleted layer thickness.

关 键 词：聚合物溶液 不可及孔隙体积 多孔介质 有效粘度 衰竭层效应 

分 类 号：TE357.431[石油与天然气工程—油气田开发工程]