关键词: 黏弹性, 聚合物, 数值模拟, 微孔道, 渗流机理

Abstract: A simulation experiment is carried out for polymers which are different from the viscoelasticity of Newtonian fluids. In order to describe the rheology of polymer solution accurately, the constitutive equation of Maxwell is used to control the fluid characteristics. What's more, a physical model of polymer solution flowing in the micro waterwet capillary is established. Finally, CFD software was used to carry out numerical analysis of the model. The pressure fields, stress fields and velocity fields of polymer flow are obtained by numerical simulation, and the change state of polymer flooding is studied. Through pressure, stress, velocity field changes, we can intuitively realize that in the process of polymer flooding, the unique elasticity of the viscoelastic fluid increases the volume of the residual oil by the displacement fluid during the extrusion collision, and makes the original flow of oil flow. The research results can further improve the polymer flooding microscopic seepage theory.

Key words: Viscoelasticity, Polymer, Numerical simulation, Micropores, Percolation mechanism