低矿化度水驱提高采收率影响因素研究-豆柴文库

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低矿化度水驱提高采收率影响因素研究
Title:FactorsAffectingImprovedRecoveryEfficiencyinLowSalinityWaterFlooding:AStudy
Introduction:
Waterfloodingisawidely-usedsecondaryoilrecoverytechniquethatinvolvesinjectingwaterintooilreservoirstoincreasetheoveralloilrecovery.Inrecentyears,lowsalinitywaterfloodinghasgainedattentionasaneffectivemethodtoenhanceoilrecovery.Thistechniqueinvolvesinjectingwaterwithreducedsalinitylevelscomparedtotraditionalseawaterflooding.Theaimofthisstudyistoinvestigatethevariousfactorsthatinfluencetheimprovedrecoveryefficiencyinlowsalinitywaterflooding.
FactorsAffectingImprovedRecoveryEfficiencyinLowSalinityWaterFlooding:
1.RockandFluidInteraction:
Theinteractionbetweenthereservoirrockandfluidsplaysacrucialroleintheefficiencyoflowsalinitywaterflooding.Thechangesintheionicstrengthoftheinjectedwatercanalterthewettabilityoftherocksurface,leadingtoimprovedoildisplacement.Theformationofclayswellingandfinesmigration,whichaffectsthepermeabilityoftherock,canalsobeinfluencedbythesalinityoftheinjectedwater.
2.pHandIonExchange:
ThepHleveloftheinjectedwateraffectstheinteractionbetweentherockandfluids.AchangeinpHaltersthesurfacechargeofboththerockandoilparticles,leadingtoanincreasedattractionbetweenthem.Additionally,ionspresentintheinjectedwatercanundergoionexchangereactionswiththeclaymineralsintherock,resultinginchangesinwettabilityandoilrecoveryefficiency.
3.OilCompositionandInterfacialTension:
Thecompositionoftheoilbeingproducedaffectstheefficiencyoflowsalinitywaterflooding.Asthesalinityoftheinjectedwaterdecreases,theinterfacialtensionbetweentheoilandwaterphasesalsodecreases.Thisreductionininterfacialtensionpromotesthespontaneousspreadingandmigrationofoilinthereservoir,facilitatingimprovedoildisplacementandrecovery.
4.FormationHeterogeneity:
Theheterogeneityofthereservoirformationimpactstheefficiencyoflowsalinitywaterflooding.Variationsinporosity,permeability,andpresenceofnaturalfracturesaffecttheflowpatternsofbothwaterandoilphases.Studieshaveshownthatlowsalinitywaterfloodingca