Study on Displacement Mechanism of Residual Oil Film Deformation in Micro-Channels

Abstract

In order to further explore the displacement fluid elastic displacement mechanism of remaining oil, use the convection maxwell viscoelastic fluid constitutive equation is established in the microchannel flow equation. Based on the stress tensor theory, the normal and horizontal deviator stress difference acting on the residual oil film is calculated. The effects of different viscoelastic displacement fluids and oil film widths on the horizontal and normal deviator stress difference acting on the residual oil film are comparatively analyzed. The results show that the displacement fluid acting on the residual oil film will cause sudden change in the horizontal and normal deviator stress of the residual oil film. For polymer solution with greater viscoelasticity, there is greater normal and horizontal deviator stresses acting on the residual oil film, and the deformation of the residual oil film will be greater. The study lays the foundation for calculating the stress and deformation of residual oil under special boundary conditions. At the same time, also as the research provides theoretical basis for residual oil membrane rupture.