Enhanced Oil Recovery (EOR) by Combined Low Salinity Water Polymer Flooding

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1、Articlepubs.acs.org/EFEnhancedOilRecovery(EOR)byCombinedLowSalinityWater/PolymerFloodingBehruzShakerShiran*andArneSkaugeCentreforIntegratedPetroleumResearch(UniCIPR),UniversityofBergen,Allegaten41,5007Bergen,NorwaýABSTRACT:Recently,lowsalinitybrineinjectionhasbeengivenagreatinterestasatechniquefore

2、nhancedoilrecovery(EOR)bywaterflooding.Varyingexperimentalresultshavebeenreportedintheliterature,frommanypromisingresultstolimitedornoeffectsoflowsalinity.TheapplicationoflowsalinitywaterincombinationwithotherestablishedEORprocesses(e.g.,surfactantfloodingandpolymerflooding)isofgreatinterest.Thecombined

3、processesinvolvedampeningcapillaritytoavoidtrappingofmobilizedoil,reducingresidualoilsaturation(Sor),andalteringfrontalstabilityandsweep.Inthisarticle,weaddressthequestionsoftimingofLSinjectionandtheaddedbenefitofpolymerinjection.Secondary-mode(atinitialwatersaturation)andtertiary-mode(afterseawaterr

4、esidualoilsaturation)lowsalinitywaterfloodingexperimentswereperformedonoutcropBereasandstonecorematerial.Themainresultsaretheoilrecoveryefficienciesofthesetwodifferentfloodingmodes.Theseresultsshowanincreaseinoilrecoveryofabout13%oftheoriginaloilinplace(OOIP)insecondary-modecomparedtotertiary-modelowsali

5、nitywaterflooding.Moreover,theeffectofpolymerinjectionwasfoundtobemorepositivewhenlowsalinitywasinitializedfromthestartofwaterinjection(secondarymode).Inthiscase,thefinalrecoveryfactorincreasedtoabout90%OOIP.Possiblemechanismsforlowsalinityandlowsalinitypolymerinjectionarediscussed.■INTRODUCTIONAnincre

6、aseinpH,forinstance,hasbeenreportedinmanyIncreasedoilrecoverybysubstantiallyloweringtheinjectionarticlesasthereasonfortheLSE.However,numerousbrinesalinityormodifyingthebrinecompositionoftheinjectionexperimentalstudieshaveshownnocorrelationbetweenthewaterhasbeenreportedinnumerousexperimentalstudiesan

7、dLSEandchangesinpH.Thatis,therearereportsofabenefitto14,19,20fieldtrialsforbothtertiary(residualoilcondition)andsecondarylowsalinitywithaslightchangeorevenadecreaseinpH,(initialwatercondition)modesofwat