利用分子模拟技术与岩心流动装置相结合的优势,研究了相对渗透率调节剂的控水机理.为了从分子层面考察相对渗透率调节剂调节油水渗流的原理,构建了油水混相通过负载于二氧化硅表面的相对渗透率调节剂的动态模型.结果显示,聚合物分子在水相中呈舒展状态,而在油相中呈收缩状态,油相压缩相对渗透率调节剂膜；模拟计算油水混相通过相对渗透率调节剂的扩散系数比为4.2,与岩心驱替实验结果一致,两者结合验证了合成的相对渗透率调节剂达到了分子结构设计的要求,具有相对渗透率调节能力.相对渗透率调节剂控水机理是:相对渗透率调节剂遇水膨胀后,水相以渗流方式通过相对渗透率调节剂时,由于水与相对渗透率调节剂分子链的极性部分相互作用,通过速率较慢；由于油水两相具有界面,油相对吸水后的相对渗透率调节剂弹性膜施加压力,形成油相通道,使油相快速通过.%The water control mechanism of relative permeability modifier (RPM) are studied with molecular simulation technology and core flow appara-tus for further study at molecular level, and then building the dynamic model of oil(n-hexadecane)/water mixed phase passing the RPM-laden SiO2 sur-face. The model shows that the RPM has swelling state in water phase, but contracting in oil(n-hexadecane) phase. The ratio of oil(n-hexadecane)/water mixed phase diffusion coefficient is 4.2, it is equal to the experimental data based on core flow apparatus. The water control mechanism of relative per-meability modifier(RPM) can be explained by swelling-contracting mechanism and oil-water fluid partitioning mechanism.
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