Abstract: Firstly, the molecular coil size of 4 kinds of polymers, whose molecular weight polymers is 8 million, 12 million, 16 million and 20 million respectively, was measured by the light blockage counter. Then pore cumulative distribution curve of field cores was measured by kerosene mass method. Finally the relationship curves between polymer molecular coil size and inaccessible pore volume of field cores were plotted. On the basis of this study, the water saturation value is assigned to the volume of the pore volume, and the polymer molecular weight with better compatibility with rock pores is optimized according to the relationship curve drawn. This method is based on the micro channel of underground rock. It has reasonable value and simple steps. And there are some guidances for the selection of the polymer in the oil field.

Key words: Inaccessible pore volume, Polymer flooding, Kerosene mass method, Light blockage counter

摘要： 首先应用光阻计数器对实验提供的相对分子质量分别为800万、1200万、1600万、2000万的4种聚合物测定了分子线团尺寸,接着利用饱和煤油法测得现场岩芯的孔隙累计分布曲线,最终绘制出各岩芯对应的聚合物分子线团尺寸与不可及孔隙体积关系曲线。在此基础上将含水饱和度赋值给不可及孔隙体积,依据已经绘制的聚合物分子线团尺寸与IPV关系曲线优选出与岩石孔隙配伍性更好的聚合物分子质量。该方法是以地下岩石的微观孔道为研究切入点,取值合理,步骤简便,对现场聚合物选择有一定指导作用。

关键词: 不可及孔隙, 聚合物驱, 饱和煤油法, 光阻计数器