【7A文】Advances in the Technology of Formation Damage Control.ppt

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1、AdvancesintheTechnologyofFormationDamageControlSignificanceofCarryingouttheTechnologyDiscovertargetformationswithoutdelayintheexplorationstageRelatedtoenhancementoftheproductionrateofoilwellsandtheeconomicbenefitofexploitationBebeneficialtoincreasingultimaterecoveryan

2、dstableproductionAspectsInvolvedintheTechnologyofFormationDamageControlCoreAnalysisEvaluationofFormationSensitivityandDamageInducedbyWorkingFluidsStudyandDiagnosisofFormationDamageMechanismsFormationDamageControlDuringDrillingFormationDamageControlDuringCompletionForm

3、ationDamageControlDuringproductionFieldEvaluationofFormationDamageEvaluation&AnalysisofOverallEffectivenessforFormationDamageControl1.FormationDamage&ReservoirProductivityTheIdealReservoirModelSchematicofskinpressuredifferentialCorrelationbetweenskinpressuredifferenti

4、al&skinfactorwhere，h—thicknessoftargetformation，m；P—skinpressuredifferential，MPa；q—productionrate，m3/d；o—viscosityofcrudeoil，mPas；Bo—volumefactor，dimensionless;S—skinfactor,dimensionless.Skinfactor——ameasureofdamageTheskinfactor,S,isrelatedtopermeabilityanddepthofi

5、nvasionasfollows:where:Kd=alteredzonepermeabilityK=unalteredformationpermeabilityrd=radiusofalteredzonerw=radiusofwellboreFor:S>0formationisprobablydamagedsinceKdKTheCNPCRegulationforevaluationofformationdamageforhomogeneoussa

6、ndstoneformations(CNPC关于均质砂岩油气层损害的评价标准)Extentofdamage:slightintermediateseriousS0~22~10>10FormationdamageacceleratesdeclineofproductionrateFormationDamageResultsinDelayedPayoutImpactofFormationDamageonProductionRateSEconomicImplicationsofFormationDamageFD$L=365qo*P*D

7、RP—oilprice,FD$/bblqo—undamagedproductionrate,STB/DDR—damageratioAnnualRevenueLossPerOilWellTheimpactofformationdamageonreservoirproductivitycanbeevaluatedbycomputingtheannualrevenuelossperwell(FD$L)atagivenoilprice,P,asdescribedbytheequationbelow.FormationDamageCanRe

8、sultinExcessiveLossofRevenueCorrelationBetweenFlowEfficiency&SkinFactorEf=Jactual/Jideal=7/(7+s)whens=1.75时，Efdecreaseby20