A Numerical Study of the Critical Gas Saturation in a Porous Medium

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We use pore-network simulations to study the dependence of the critical gas saturation in solution-gas drive processes on the geometric parameters of the porous medium. We show that for a variety of growth regimes (including global and local percolation, instantaneous and sequential nucleation, and mass-transfer driven processes), the critical gas saturation, Sgc, follows a power-law scaling with the final nucleation fraction (fraction of sites activated), fq. For 3-D processes, this relation reads Sgcf0.16q, indicating a sensitive dependence of Sgc to fq at very small values of fq.

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