TITLE:
Numerical Calculation of Viscous-Elastic Fluid Flooding Residual Oil Film in the Complex Pore
AUTHORS:
Lili Liu, Chao Yu, Lihui Wang, Lu Liu
KEYWORDS:
Complex Pore; Residual Oil Film; Deformation; Viscous-Elasticity; Permeability
JOURNAL NAME:
Open Journal of Fluid Dynamics,
Vol.3 No.3,
September
18,
2013
ABSTRACT: In order to
analyze the stress and deformation of different permeability of residual oil
film in the complex pore, which are affected by the viscous-elasticity of the fluid, the hydrodynamic displacement
mechanism is explored from the stand-point
of hydrodynamics, that is, the residual oil film displaced by alternating
injection of different concentrations of the polymer solution, viscous-elastic
fluid flow equation is established in the complex pore by choosing continuity
equation, motion equation and the upper convected Maxwell constitutive equation. The flow field is computed by using the method of numerical analysis. Not only the stress and deformation of residual
oil film on the different permeability of micro pores, but also the analysis of the flooding mechanism
of alternating injection of different concentrations of the polymer solution is got. The results show that the larger the viscous-elasticity
of polymer solution is, the bigger the normal deviatoric stress acting on the
residual oil film is; the distribution of
normal deviatoric stress has the abrupt change. The stronger the viscous-elasticity
of the polymer solution is, the bigger the horizontal stress difference acting
on the residual oil film is and the more obvious the
deformation is; the high-concentration polymer solution is suitable for
high-permeability micro pores. Low-concentration
polymer solution is suitable for medium and low-permeability micro pores. Alternating
injection of polymer solution can improve Volumetric Sweep Efficiency and
increase the deformation of residual oil film,
which is conducive to enhancing oil recovery.