Abstract
In order to analyze the microscopic theory of viscous-elastic fluid flooding residual oil, the flow equation of polymer solution in the micro pore can be derived by selecting upper-convected Maxwell constitutive equation, continuity equation and motion equation. Then, the flow velocity field and stress field can be calculated under the boundary condition, and with the theory of stress tensor, the horizontal stress difference of polymer solution acting on the residual oil can be calculated. The results show that the greater the elasticity of viscous-elastic fluid is, the wider the flow channel is, the greater the horizontal stress difference is. The force acting on residual oil by viscous-elastic fluid can be increased by increasing the concentration of the polymer solution.
Highlights
The practice of enhanced oil recovery shows that the recovery can be improved by the viscous-elastic polymer solution flooding
With the increasing of We, the increasing of horizontal stress difference maximum is faster
In order to obtain the same force of horizontal displacement force, We is large when the flow channel is 20 μm
Summary
The practice of enhanced oil recovery shows that the recovery can be improved by the viscous-elastic polymer solution flooding. They pointed out that in the microscopic pore space, it is microscopic force that made the residual oil deform and separate. The Mathematical Model of Upper-Convected Maxwell Viscous-Elastic Fluid in the Micro Pore
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