Abstract During enhanced oil recovery, polymers are used to improve the sweep efficiency during chemical injection process. Polymers are mainly characterized based on their viscoelasticity response; however, the role of polymer elasticity on heavy oil considering the effect of water saturation in porous media has not been well explored. In this work, four blends of polyacrylamide polymer solutions with similar molecular weight and shear viscosity but different bulk elasticity (due to different molecular weight distribution) were used. A series of flooding experiments were performed using a cylindrical core sand pack saturated with heavy oil designed to simulate linear flow. The flow rate was selected based on the shear rate range present in field applications. Effect of elasticity during the injection of these polymer solutions were compared during tertiary recovery experiments in terms of oil recovery and residual resistance factor at different initial water-flood volumes. The results indicate that the effect of polymer elasticity was more profound in tertiary mode with higher water saturation. An additional pressure drop was required to push a higher elastic solution. The required pressure drop to push the polymer solutions increased with water saturation. Graphical Abstract

中文翻译：

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水饱和度对稠油采收过程中聚合物弹性作用的影响

摘要 在提高采收率过程中，聚合物被用于提高化学注入过程中的波及效率。聚合物的特征主要基于它们的粘弹性响应；然而，考虑到多孔介质中水饱和度的影响，聚合物弹性对稠油的作用尚未得到很好的探索。在这项工作中，使用了具有相似分子量和剪切粘度但体积弹性不同（由于分子量分布不同）的聚丙烯酰胺聚合物溶液的四种共混物。使用设计为模拟线性流动的重油饱和的圆柱形岩心砂堆进行了一系列驱油实验。根据现场应用中存在的剪切速率范围选择流速。在三次采油实验中，根据不同初始水驱体积下的采油率和残余阻力系数，比较了注入这些聚合物溶液期间弹性的影响。结果表明，聚合物弹性的影响在含水饱和度较高的三次模式中更为显着。需要额外的压降来推动更高弹性的解决方案。推动聚合物溶液所需的压降随着水饱和度的增加而增加。图形概要 推动聚合物溶液所需的压降随着水饱和度的增加而增加。图形概要 推动聚合物溶液所需的压降随着水饱和度的增加而增加。图形概要