Fractional flow theory still serves as a powerful tool for validation of numerical reservoir models, understanding of the mechanisms, and interpretation of transport behavior in porous media during the Chemical-Enhanced Oil Recovery (CEOR) process. With the enrichment of CEOR mechanisms, it is important to revisit the application of fractional flow theory to CEOR at this stage. For surfactant flooding, the effects of surfactant adsorption, surfactant partition, initial oil saturation, interfacial tension, and injection slug size have been systematically investigated. In terms of polymer flooding, the effects of polymer viscosity, initial oil saturation, polymer viscoelasticity, slug size, polymer inaccessible pore volume (IPV), and polymer retention are also reviewed extensively. Finally, the fractional flow theory is applied to surfactant/polymer flooding to evaluate its effectiveness in CEOR. This paper provides insight into the CEOR mechanism and serves as an up-to-date reference for analytical modeling of the surfactant flooding, polymer flooding, and surfactant/polymer flooding CEOR process.

中文翻译：

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分流理论在表面活性剂驱、聚合物驱和表面活性剂/聚合物驱用于化学提高采收率的分析建模中的应用

分数流理论仍然是验证数值储层模型、理解机制以及解释化学提高采油 (CEOR) 过程中多孔介质中的传输行为的有力工具。随着 CEOR 机制的丰富，现阶段重新审视分数流理论在 CEOR 中的应用非常重要。对于表面活性剂驱，已经系统地研究了表面活性剂吸附、表面活性剂分配、初始油饱和度、界面张力和注入段塞尺寸的影响。在聚合物驱方面，聚合物粘度、初始含油饱和度、聚合物粘弹性、段塞尺寸、聚合物不可及孔隙体积 (IPV) 和聚合物保留率的影响也被广泛审查。最后，分数流理论应用于表面活性剂/聚合物驱，以评估其在 CEOR 中的有效性。本文提供了对 CEOR 机制的深入了解，并作为表面活性剂驱、聚合物驱和表面活性剂/聚合物驱 CEOR 过程分析建模的最新参考。