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To analyze and calculate the micro-scale stress of viscoelastic fluid in displacing residual oil and explore the rheological property of non-Newtonian fluid from hydrodynamics angle, an upper-convected Maxwell constitutive equation was selected to simulate viscoelastic fluid. Furthermore, boundary conditions were adopted to calculate the flow field of flow, and the normal deviatoric stress and horizontal stress difference acting on residual oil from viscoelastic fluid were calculated by combining stress tensor theory. The calculated result showed that: the viscosity, elasticity and flow rate of polymer solution are key factors influencing stress and deformation of residual oil. Therefore, methods like increasing mass concentration and molecular mass of polymer solution can be applied to enlarge viscosity and elasticity of polymer solution, thus increasing the displacement stress acting on residual oil and laying foundation for further analysis on deformation and breakup of residual oil.

Stress Calculation of Polymer Displacing Residual Oil in Micro Pores