The research of three-phase relative permeability is a key issue in oilfield development. In this study,three-phase relative permeabilities of water-wet and oil-wet outcrops with two saturating histories were investigated by steady physical simulation experiments using a CT dual energy scanning method.The experiment results clearly showed that there was significant effect of wettability on three-phase permeabilities.For water-wet cores,the isoperms of water were straight lines,suggesting that the three-phase relative permeability to water only depended on water saturation.The isoperms of oil were concave towards 100% oil saturation point,while the isoperms of gas were convex towards 100% gas saturation point,suggesting that the three-phase relative permeabilities to oil and gas depended on all the saturations.For oil-wet cores,all the isoperms of water, oil and gas were convex towards 100 % of its saturation,suggesting that the three-phase relative permeabilities to water,oil and gas depended on all the saturations.In addition, the isoperms of wetting phase were similar for the two saturation histories,while those of non-wetting phase were different.Even though the shapes of the isoperms were the same, the corresponding values of permeabilities and the positions of isoperms were different.
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