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酸化增能技术在断层附近油井剩余油挖潜中的应用.docx

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酸化增能技术在断层附近油井剩余油挖潜中的应用 Abstract Thedevelopmentofunconventionaloilresourcesiscrucialinmeetingtheincreasingdemandsforenergy,inwhichenhancedoilrecovery(EOR)playsacriticalrole.AmongvariousEORtechniques,oxidativemethodssuchaspolymerfloodingandsurfactantfloodinghavebeenwidelyusedforrecoveringtheresidualoilinfracturedreservoirs.Inthispaper,wereviewtheapplicationofoxidation-enhancedtechnologiesinnear-faultoilreservoirs,focusingontheformationmechanism,advantagesandlimitations,andthefuturedevelopmenttrendofsuchtechniques. Introduction Conventionaloilreservoirshavebeenwidelyexploited,resultinginhighproductioncostsandlowrecoveryrates,whileunconventionaloilresourcessuchasshaleoilandheavyoilhaveattractedincreasingattentionfortheirabundantreservesandlowproductioncosts.However,therecoveryofunconventionaloilresourcesisoftenhamperedbycomplexgeologicalconditions,includingfracturedreservoirs,lowpermeability,andhighviscosity.Moreover,duetothelowsweepingefficiencyoftheoildisplacementprocess,alargeamountofoilremainstrappedintheporousmedia,leadingtolowoilrecoveryrates. EnhancedOilRecovery(EOR)technologieshavebeendevelopedtorecovertheresidualoilinunconventionalreservoirs.Amongthem,oxidativeEORtechniques,suchaspolymerfloodingandsurfactantflooding,haveattractedsignificantattentionduetotheirhighoilrecoveryratesandlowenvironmentalimpact.Inthispaper,wefocusontheapplicationofoxidativeEORtechnologiesinnear-faultoilreservoirs,whicharecharacterizedbycomplexgeologicalconditions. FormationMechanismofOxidativeEORTechnologies OxidativeEORtechnologiesinvolvetheinjectionofoxidantsintothereservoir,resultinginthebreakingofoilmoleculesandthereleaseoftrappedoil.TheformationmechanismofoxidativeEORtechnologiescanbecategorizedintotwotypes:in-situcombustionandchemicalflooding. In-situcombustioninvolvesthecreationofahigh-temperaturecombustionfrontinthereservoir,leadingtothebreakingofoilmoleculesandthereleaseoftrappedoil.Chemicalfloodinginvolvestheinjectionofoxidants,suchashydrogenperoxideorpotassiumpermanganate,wh