Exploration and Development Research Institute, Petrochina Daqing Oilfield Company Limited, Daqing 163712, China.
Research and Development Center of Sustainable Development of Continental Sandstone Mature Oilfield, Daqing 163712, China.
Molecules. 2022 Jun 20;27(12):3958. doi: 10.3390/molecules27123958.
Relative permeability of polymer flooding plays a very important role in oil field development. This paper aimed to measure and calculate the relative permeability curves of polymer flooding more accurately. First, viscosity variation law of polymer in porous media was studied. Rock particles of different diameters and cementing agent were used to make artificial cores and hydrophobically associating polymer solutions were prepared for experiments. Polymer solutions were injected into the cores filled with crude oil and irreducible water. In the process of polymer flooding, produced fluid was collected at different water saturations and locations of the core. Polymer solutions were separated and their viscosities were measured. With the experimental data, the viscosity variation rule of polymer transporting in porous media was explored. The result indicates that the viscosity retention rate of polymer solutions transporting in porous media has power function relationship with the water saturation and the dimensionless distance from the core inlet. Finally, the relative permeability curves of polymer flooding were measured by unsteady state method and the viscosity variation rule was applied to the calculation of the relative permeability curves.
聚合物驱的相对渗透率在油田开发中起着非常重要的作用。本文旨在更准确地测量和计算聚合物驱的相对渗透率曲线。首先，研究了聚合物在多孔介质中的粘度变化规律。使用不同直径的岩心颗粒和胶结剂制作人造岩心，并制备疏水缔合聚合物溶液进行实验。将聚合物溶液注入充满原油和不可压缩水的岩心中。在聚合物驱替过程中，在不同的水饱和度和岩心位置收集产出液。将聚合物溶液分离并测量其粘度。利用实验数据，探讨了聚合物在多孔介质中的运移粘度变化规律。结果表明，聚合物溶液在多孔介质中的粘度保持率与水饱和度和距岩心入口的无因次距离呈幂函数关系。最后，采用非稳态法测量了聚合物驱的相对渗透率曲线，并将粘度变化规律应用于相对渗透率曲线的计算。
