Abstract
In order to analyze the normal deviatoric stress that viscous-elastic fluid acting on the residual oil under the situation of different flooding conditions and different permeabilities, Viscous-elastic fluid flow equation is established in the micro pore by choosing the continuity equation, motion equation and the upper-convected Maxwell constitutive equation, the flow field is computed by using numerical analysis, the forces that driving fluid acting on the residual oil in micro pore are got, and the influence of flooding conditions, pore width and viscous-elasticity of driving fluid on force is compared and analyzed. The results show that: the more viscous-elasticity of driving fluid increases, the greater the normal deviatoric stress acting on the residual oil increases; using constant pressure gradient flooding, the lager the pore width is, the greater normal deviatoric stress acting on the residual oil will be.
Highlights
In the enhanced oil recovery, the viscous-elastic fluid flooding is a very important part
By experimental studies Wang Demin [1] found that viscous-elastic polymer solution can improve flooding efficiency in micro pore; Yin Hongjun [2] studied that the rheology of viscous-elastic polymer solution in the dead end: Xia Huifen [3] discussed the microscopic mechanism of viscous-elastic polymer solution improving flooding efficiency
In order to analyze the force acting on residual oil in micro pore of different width, a calculation model is established shown in Figure 1, Where H is the pore width, takes 20 μm, 40 μm, 60 μm respectively
Summary
In the enhanced oil recovery, the viscous-elastic fluid flooding is a very important part. Many scholars have made a lot of efforts on viscous-elastic fluid enhancing oil recovery. By experimental studies Wang Demin [1] found that viscous-elastic polymer solution can improve flooding efficiency in micro pore; Yin Hongjun [2] studied that the rheology of viscous-elastic polymer solution in the dead end: Xia Huifen [3] discussed the microscopic mechanism of viscous-elastic polymer solution improving flooding efficiency. The force of viscous-elastic fluid acting on residual oil is analyzed theoretically under different flooding conditions, different permeabilities, which lays the foundation for further analysis of deformation
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