Polymer solution has extremely extensive applications in many natural and industrial processes, especially in oilfield development field, such as polymer flooding, fracturing and water shut-off. Thus, the study of flow behaviors of polymer in formation pores is significantly important. In this paper, the flow behaviors of the polymer droplets in the 3-D pore throat structure were systematically studied. Additionally, the influencing factors (polymer concentration, molecular weight and pore throat ratio, for instance) were investigated. As the increasing of polymer concentration and molecular weight, the polymer droplets were more difficult to break, which means the critical flow rate decreased and the average sizes of the first daughter droplets (FDD) were longer synchronously. Moreover, with the increase in pore throat ratio, the critical flow rate increased and the length of the FDD decreased. In addition, the prediction models of the length of the FDD with polymer concentration and pore throat ratio were established, respectively. The prediction model revealed that the length of the FDD satisfied an exponential relationship with the polymer concentration and a linear relationship with the pore throat ratio. Finally, the average size of droplets after macroscopic core flooding experiment was 8 μm and 17 μm when the polymer concentration was 0.01% and 0.1%, respectively. The results were consistent with the breakup behaviors of polymer droplets in the microscopic pore throat structure.

聚合物溶液在许多自然和工业过程中具有极其广泛的应用，特别是在油田开发领域，例如聚合物驱，压裂和注水。因此，研究聚合物在地层孔隙中的流动行为非常重要。本文系统地研究了聚合物液滴在3-D孔喉结构中的流动行为。此外，还研究了影响因素（例如聚合物浓度，分子量和孔喉比）。随着聚合物浓度和分子量的增加，聚合物液滴更难以破裂，这意味着临界流速降低，并且第一子液滴（FDD）的平均尺寸同步变长。而且，随着孔喉比的增加，临界流量增加，FDD的长度减少。此外，分别建立了FDD长度与聚合物浓度和孔喉比的预测模型。预测模型表明，FDD的长度与聚合物浓度呈指数关系，与孔喉比呈线性关系。最后，当聚合物浓度为0.01％和0.1％时，宏观岩心驱替实验后的液滴平均尺寸分​​别为8μm和17μm。结果与微观孔喉结构中聚合物液滴的破碎行为一致。分别。预测模型表明，FDD的长度与聚合物浓度呈指数关系，与孔喉比呈线性关系。最后，当聚合物浓度为0.01％和0.1％时，宏观岩心驱替实验后的液滴平均尺寸分​​别为8μm和17μm。结果与微观孔喉结构中聚合物液滴的破碎行为一致。分别。预测模型表明，FDD的长度与聚合物浓度呈指数关系，与孔喉比呈线性关系。最后，当聚合物浓度为0.01％和0.1％时，宏观岩心驱替实验后的液滴平均尺寸分​​别为8μm和17μm。结果与微观孔喉结构中聚合物液滴的破碎行为一致。