Effect of Alkaline Preflush in an Alkaline-Surfactant-Polymer Flood

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1、Articlepubs.acs.org/EFEffectofAlkalinePreflushinanAlkaline-Surfactant-PolymerFloodKrishnaPanthiandKishoreK.Mohanty*DepartmentofPetroleumandGeosystemsEngineering,TheUniversityofTexasatAustinABSTRACT:Anultralowinterfacialtensionalkali-surfactant-polymerformulationwasdevelopedforasandstonereserv

2、oir.Phasebehaviorwasstudiedwiththereservoiroilatdifferentwater−oilratiosandvaryingsalt/alkaliconcentrations.Therheologyoftheresultingmicroemulsionphaseswasmeasuredwithandwithoutpolymers.Thesurfactantformulationwastestedwithafieldcoreandanout-cropcore,withandwithoutanalkalinepreflush.Waterfloodr

3、ecoveredabout48%oftheoilinplaceandreducedtheoilsaturationto35%forthefieldcore.ThetertiaryASPinjectioninthefieldcorewithoutalkalinepreflushyielded80%cumulativeoilrecovery;therecoveryincreasedto85%inthesamecore(andthesamesurfactantformulation)ifthealkalinepreflushwasused.Theoilrecoveryintheout-cr

4、opcorewiththealkalinepreflushwas94%.Alkalinepreflushincreasesthecoresalinitytotheoptimumsalinityofthesurfactantformulationbeforethesurfactantslug.■INTRODUCTIONSurfactantformulationdevelopmentforaspecificreservoirisacomplexprocedure.ThephasebehaviorisstudiedwiththeWaterfloodrecoversaboutathirdof

5、theoilfrompetroleumfieldoilandbrineformanysurfactants.Thesurfactantsarereservoirsbecauseofcapillarytrappingandlarge-scaleidentifiedwhichgivethree-phasebehavioratasalinityclosetobypassingduetopermeabilityheterogeneity.IntheU.S.,thereservoirsalinity.Cosurfactant,alkali,andalcoholareoftenabout16

6、8billionbarrelsofoilhavebeenrecovered,butabout377billionbarrelshavebeenleftbehindinknownreservoirs.1addedtoimprovethephasebehaviorandavoidliquid18,19Tertiaryrecoverytechniquessuchaschemicalflooding,crystallinephases.Thepolymeristhenaddedtoincreasemisciblegasdisplacement,andthermalrecoveryare

7、neededtheviscosityoftheaqueousphaseformobilitycontrol.Alloftoextractapartofthisremainingoil.thechemicalsarecheckedforlong-termchemicalandthermalChemicalfloodingusingalkali,surfactants,andpolymersstabilityatthereservoirconditions.Corefloodexperimentsare(alk