Abstract

Abstract The paper presents a precise description of the pore-scale displacement mechanisms responsible for the mobilization and subsequent recovery of waterflood residual oil by immiscible, gas flooding. The displacement mechanisms are incorporated into a numerical three-phase invasion percolation type network model which is used to compute oil recoveries by tertiary gas flooding for oil-water-gas systems displaying positive and negative spreading behaviour under strongly water wet conditions. Computed oil recoveries are shown to be in good agreement with those observed in micromodel displacement experiments. The network model confirms the. important role of oil spreading films in increasing recovery of water-flood residual oil for positive spreading systems.

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