Abstract
Summary This paper investigates the mobilization and recovery of waterflood residual oil by immiscible gasflooding in 2D glass micro-models under strongly oil- and water-wet conditions. Two oil/water/gas systems, one displaying a positive and the other a negative spreading coefficient (oil over water), were used. The results clearly show the importance of fluid/solid and fluid/fluid interactions on tertiary oil recovery. Oil recovery was highest for the oil-wet displacements where the oil formed thick wetting films. Recovery was considerably lower for the positive spreading system under strongly water-wet conditions where the oil was observed to form thin but continuous spreading films. Recovery was lowest for the negative spreading system under strongly water-wet conditions where no oil films were formed.
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