Abstract To decrease the unwanted water and increase oil, the influences of factors such as matching coefficient (the ratio of particle size to pore throat size), particle elasticity, seepage velocity, and particle concentration on migration and plugging of polymer microspheres (PMs) in porous media were studied. Then, particular emphasis was placed on the development of empirical correlations of resistance coefficient and blocking rate versus the factors mentioned above, which was less studied in the profile control of PMs. The results indicated that the plugging capability of PMs was notably enhanced after the matching coefficient and particle elasticity were increased to 1.2 and 10 K Pa, respectively. The resistance coefficient and blocking rate increased while reducing seepage velocity and raising particle concentration, especially the seepage velocity from 1.3 to 0.8 m/d and the particle concentration from 0.1 to 0.3 wt%. To control water production in mature waterflooded oil reservoirs with high-permeable layers, the matching coefficient, particle elasticity, and particle concentration were supposed to be at least 1.2, 10 K Pa, and 0.2 wt%, respectively, and seepage velocity should be no higher than 0.8 m/d. The obtained empirical correlations were expected to predict the profile control performance and optimize the size, elasticity, seepage velocity, and concentration of PMs.

中文翻译：

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聚合物微球 (PMs) 在多孔介质中的迁移和堵塞以提高采油率：实验研究和经验相关性

摘要 为减少无水增油，研究了匹配系数（粒径与孔喉尺寸之比）、颗粒弹性、渗流速度、颗粒浓度等因素对聚合物微球（PMs）迁移和堵塞的影响。多孔介质进行了研究。然后，特别强调了阻力系数和阻塞率与上述因素的经验相关性的发展，这在 PM 的剖面控制中研究较少。结果表明，当匹配系数和颗粒弹性分别增加到 1.2 和 10 K Pa 后，颗粒物的封堵能力显着增强。在降低渗流速度和提高颗粒浓度的同时，阻力系数和阻塞率增加，特别是渗流速度从 1.3 到 0.8 m/d，颗粒浓度从 0.1 到 0.3 wt%。高渗透油藏成熟水驱油藏控制产水，匹配系数、颗粒弹性和颗粒浓度分别应至少为1.2、10 K Pa和0.2 wt%，渗流速度应不小于高于 0.8 m/d。获得的经验相关性有望预测调剖性能并优化 PM 的尺寸、弹性、渗流速度和浓度。和 0.2 wt%，渗流速度应不高于 0.8 m/d。获得的经验相关性有望预测调剖性能并优化 PM 的尺寸、弹性、渗流速度和浓度。和 0.2 wt%，渗流速度不高于 0.8 m/d。获得的经验相关性有望预测调剖性能并优化 PM 的尺寸、弹性、渗流速度和浓度。