润湿性对提高采收率的影响.ppt

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1、TheImpactofWettability,CapillaryPressureandRelativePermeabilityonRecoveryEfficiencyinOilandBitumenReservoirsAPresentationforSPECanadaBrantBennionWeatherfordLaboratories(Canada)April27,2010PresentationSummaryBriefOverviewofWettabilityCapillaryPressureRelat

2、ivePermeabilityImpactofwettabilityoncapillarypressureandrelativepermeabilitySpecificimpactonreservoirperformanceExamplesinBitumenreservoirsWettabilityWhatisWettability?PreferentialAttractionofafluidtoasolidsurfaceinthepresenceofoneormoreotherimmiscibleflui

3、dsSolidSurfaceHydrocarbonPhaseAqeousPhaseWaterWetContactAngle<60DegOilWetContactAngle>120DegNeutralWetContactAngle60-120DegWettabilityTypesWaterWetOilWetNeutralWetMixedWetSpotted/DalmationWetTeflon-oilwet(waterrepellant)surfaceQuartz-Waterwet-attractive-su

4、rfaceStainlesssteel-neutralwettingWorldwidereservoirwettabilitysurveys(LiquidHydrocarbonBearingreservoirs)Worldwidereservoirwettabilitysurveys(LiquidHydrocarbonBearingreservoirs)CapillaryPressureCapillaryPressurePc=Pnw-PwPnwPwCapillaryPressureInNature,the‘

5、Suction’EffectofCapillaryPressureisExactlyBalancedbyGravityinanEquilibriumSituationWithnoImposedExternalPressureGradientsTheConceptofaCapillaryTransitionZone100%WaterTheConceptofaCapillaryTransitionZone100%Water'Gas'or'Oil'ZoneSwTypicalWater-GasCapillaryPr

6、essureCurveWaterSaturationCapillaryPressureHighPermeabilityTypicalWater-GasCapillaryPressureCurveWaterSaturationCapillaryPressureMidPermeabilityTypicalWater-GasCapillaryPressureCurveWaterSaturationCapillaryPressureLowPermeabilityRelativePermeabilityIngrain

7、AbsolutePermeability–isdefinedasTheResistancetoFluidFlowExistinginaPorousMediaWhenitistheOnlyPhasePresentRelativePermeability–isdefinedasTheResistancetoFluidFlowExistinginaPorousMediaWhenitisinthepresenceofothermobileorimmobile,immisciblefluidsRelativePerm

8、eabilityNomenclatureFluidSaturationPermeabilityorRelativePermeabilityPrimaryEndpointPermValuesWaterOil/GasRelativePermeabilityNomenclatureFluidSaturationPermeabilityorRelativePermeabilityFluidSaturationIncrea