MEORFieldtestatBlockLuo801ofShengliOilFieldinChinaAbstractAMicrobialEnhancedOilRecovery(MEOR)fieldtesthasbeenimplementedfor10consecutiveyearsatthe75℃-80℃BlockLuo801inShengliOilFieldinChina,wheremicrobialformulationandnutrient,producingbiosurfactant,wereinjectedintooilwells.AftertheimplementationofMEOR,theproducedfluidsamplesfromtheoilwellswereanalyzedandfoundanincreaseofbacteriaandarchaeainwaterphasestabilizingat103-4cell/mlandasoarofacetateinconcentrationfrom70mg/Lto523.0mg/Lwithoutfindingthetypeofinjectedmicrobialtypes,suggestingthenutrientinjectedhasactivatedtheindigenousbacteriainthereservoir,whoseactivitieswereenhancedtopreventthewatercutfromrisingupintheblocksoastoincreasetheoiloutput.UptoDecember2010,thecumulativeincreasedproductionofoilhasbeen9.75×104twiththetotaloutputsurpassingthatofWaterFloodingOilRecovery(WFOR)by3.35%.Consideringthecostofinjectedmicrobialfluidandnutrient,oilincreasedpertonnecostsaboutRMB339.56.Keywords:MicrobialEnhancedOilRecovery(MEOR),FieldTest,WaterFlooding1.IntroductionFaultblockoilreservoirsoccupyanimportantproportioninShengliOilFieldofChina,whosedevelopedgeologicalreserveshavereached9.22×108tbutwiththecomprehensivewatercut91.5%.Thushowtostoptheproductiondeclineandenhancethecrudeoilrecoverybecomesamajorchallengetodevelopfaultblockoilreservoirswithhighwatercut.Duetothesmallerareabearingoilandtheincompleteproductionwellgrid,itisnotsuitabletocarryoutchemicalenhancedoilrecoverytechnologyforfaultblockoilreservoirsandalternativeoilrecoverytechnologyisexpectedtobedevelopedforthem.MicrobialEnhancedOilRecovery(MEOR)technologyisconsideredpromisingforfaultblockoilreservoirs,whoserelatedresearchwasnotlauncheduntil1990sinShengliOilFieldbyaspecializedteamengagedinresearchandtestinMEOR.Oncetheirpurposewastoselectthebacteriatype,suitableforthereservoirenvironmentandcapabletoenhancetheoildisplacementefficiently,whichwasfirstgroundculturedtheninjectedintothereservoirs.Atthebeginningofthiscentury,researchrevealedindigenousbacteriainreservoirsareveryactive,sotheresearchfocusshiftedtoindigenousbacteria---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---enhancedoilrecovery.Currently,oilreservoirshavebeenconsideredasanecosystemintowhichmaterialsuchasspecificmicrobialformulation,inorganicororganicnutrientandairhavebeeninjectedtoregulatethem:themicrobialcommunitystructureandfunctioninsidemightchange,increasingthebacteriadensity,producingbiosurfactantandimprovingtheoil-washefficiencythrough"insitubreeding".Basedonresearchinthelaboratory,aMEORfieldtesthasbeencarriedoutinBlockLuo801inShengliOilFieldsince1999.Thetestmethodhasbeenadjustedtwiceinthe10yearperiodinthehopeofexploringthepotentialofMEORtechnologytoimproveoilrecoveryinfaultblockoilreservoirs.2.TestAreaReservoirGeologyBlockLuo801isasmallblockinShengliOilField,alithologic-structuralreservoirwithatemperaturerangingfrom75℃to80℃.Itisopeninthenorthandthesouthernpartisclosedbyaneast-westarcfault,wherethetestareaislocatedonthehangingwall.Theareabearingoilis1.95km2withthecrudeoilreserves291×104t.Thereservoirdepthisfrom1680mto1800mandtheoriginalformationpressureis17.5MPa.TheoilpoolofthetestareaislocatedontheWestWingofthenose-likestructure,whosestrataarehighinthesouthandlowinthenorthwithananglerangingfrom5ºto6º.ItpassesthroughPermianstrataincludingShahe激eFm.,DongyingFm.,Guantao...