Study on Percolation Law in Low Permeability Reservoir of Deformable Media
According to the basic idea of fluid-solid coupling theory, combining percolation mechanics with rock-soil mechanics and considering threshold pressure gradient and fluid-solid coupling character of low permeability reservoirs, a numerical model is established, which can describe the fluid-solid coupling character in saturated deformable low permeability reservoirs and can be solved by coupling numerical method combining finite difference with finite element. The percolation law for deformable medium in low permeability reservoir is studied. The typical examples indicate that the dynamic variation of petrophysics parameters, stress-strain and their effects on producing performance can be predicted by this method. Through comparing the result of the numerical simulation with the one which doesn't consider the fluid-solid coupling effect, it is seen that the fluid-solid coupling effect of low permeability reservoirs can not be neglected.