油藏物理学油藏物理学 (26).ppt

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1、5 Distribution of oil and water in rock1)Microdistribution pattern of oil-water in rock2)Factors affecting distribution of oil-water in reservoir rock Effect of saturation history Effect of wettability of rock surface Effect of saturationChannel fluid patternNon-wet phase displacement wet phaseFluid

2、 distribution during waterflood of water-wet rockDisplacement and imbibition process Displacement process definition:The process that non-wetting phase displaces wetting phase is called displacement processdisplacement process of oil-wet rockimbibition process of water-wet rockWith displacement,the

3、saturation of wetting phase reduces gradually,the saturation of non-wetting phase increases gradually;imbibition processdefinition:The process of wetting phase displaces non wetting phase is called imbibition process With imbibition,the saturation of wetting phase increases gradually,the saturation of non-wetting phase reduces gradually.6 Effect of wettability on water displacement oil1)Wettability affects oil-water microdistribution.2)Wettability decides magnitude and direction of capillary pressure 3)Wettability affects oil-water Relative Permeability.4)Wettability affects oil recovery.