Three-phase relative permeability data are required in reservoir studies of CO2 floods, steam floods or other enhanced gas drives in which three-phase flow occurs. This paper presents a laboratory method developed for direct measurement of three-phase relative permeabilities, which requires only a few extra tests in addition to the two-phase tests commonly performed. It also presents a new set of three-phase relative permeability data for an intermediate-wet Berea sandstone core. In the intermediate-wet rock studied, injection of gas did not reduce oil saturation below the residual oil saturation after waterflooding. This is in contrast with the results previously reported for strongly water-wet cases. The experimental three-phase relative permeabilities are compared with the values calculated from Stone’s correlation methods. The calculated values show significant differences from the experimental ones. It is suggested that three-phase relative permeabilities be verified by laboratory testing.

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