聚合物驱油微观渗流机理数值模拟研究

Numerical Simulation of Polymer Flooding Mechanism in Micropores

针对聚合物区别于牛顿流体特有的黏弹性建立模拟实验,为了准确描述聚合物溶液的流变性,采用Maxwell上随体本构方程来控制流体特性;建立了聚合物在微观水湿毛细管中流动的物理模型;最后使用CFD软件对模型进行数值分析。由数值模拟结果得到了聚合物流动的压力场、应力场、速度场,研究了聚合物驱替油滴时的变化状态。从而能够通过压力、应力、速度的场图变化,更加直观的认识到聚合物驱油过程中,黏弹性流体特有的弹性在挤压碰撞过程中,增大驱替液对残余油的波及体积,使原先不能流动的油流动。其研究成果可进一步完善聚合物驱油微观渗流理论。

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,aphysical 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.