大庆稳油控水技术介绍 (090308)英终稿

DaqingOilFieldCompany,Ltd.DevelopmentTechniquesinDaqingOilField

1

Daqinghasestablishedasetofwater-injectiondevelopmenttechniqueswhichissuitabletotheheterogeneousmultiple-layersandstoneoilfieldsrightnowandmadealotofachievementsforDaqingtoproducestablyfor27years.2ContentⅠOilfieldgeologyanddevelopmenthistoryⅡDevelopmenttechniquesinDaqingOilfield3OilfieldsinDaqingDevelopedoilandgasfields:35DevelopedOOIP:52.14×108t(38.74Bbbl)Reserves:24.24×108t(18.01Bbbl)Totalwells(OP+Winj):74236Recoverydegree:38.6%Recoveryfactor:46.5%Watercut:91.23%Bytheendof2008A.OilfieldgeologyLa-sa-xingoilfieldisthemajoroilfieldinDaqing,TheOOIP&recoverablereserveofthefieldtakes85.43%and91.46%ofthetotal.Satellite

新肇油田

DaqingOilfieldI.OILFIELDGEOLOGYANDDEVELOPMENTHISTORY4StructuralfeaturesLa-sa-xingoilfieldconsistsof3structureslocatingfromnorthtosouth,Lamadian,SaertuandXingshugang.Saertuinthecentralpartofthefieldisthehighestuplift.Generally,thereliefofthestructureisgentleandeven,withdipanglelessthan5degree.ReservoirfeaturesofLa-Sa-XingoilfieldSaertuLamadianXingshugang5Reservoirdistributionfeatures

2sedimentaryfaciesarepredominantinthefield,fluvialanddeltasedimentaryfacies.Vertically.Therearenumerousoillayers,including3formations,41bedsetsand136sublayers.Lake-frontdeltaDeltaouterfrontDeltainnerfrontFloodingplainDistributaryfloodedplainReservoirsinDaqingaresedimentsformedundertheenvironmentduringlakewateradvancingandrecedingfromnorthtosouth

6Netpay:0.2m-10mReservoirdepth:800-1200mPermeability:1-3000mDPorosity:19-30%Oilsaturation:30％-75％WAX:26%Reservoirtemperature:45oCAPI:35Viscosity:10cpWelldepth:1200mReservoirCharacteristicsDistinctfaciesvariationandsevereheterogeneityontheplaneandvertically7喇萨杏喇萨杏+南部未措施+措施+措施+新井+聚合物+措施+新井TheProductionCurveofDaqingOilfieldSince1976,TheProductionof50.0mmt(350.0mmbbl)hasbeenlastedfor27yearsNonstimulationsstimulationsStimulationsplusnewwillsStimulation+newwells+polymer8B.OilfielddevelopmenthistoryPlateau(27years)Plateau(22years)35061口10420口12888口1960口9ChallengeInactiveedgeorbottomwaterandweaknaturalenergyStrategyTomaintainreservoirpressureatinitiallevelTechniquePatternfloodingResultStablepressureinreservoirsandsufficientsupportenergy葡一组层系1600m切割距500m300m300m500m注水井排注水井排葡一组层系1600m切割距500m300m300m500mPhase1：CommingledwaterinjectionatearlytimeLinewaterinjection8.0017.5535.0002040含水(%)0100020003000400050001960196519701975时间，年份年产油(104t)46268.0017.5535.0002040(%)0100020003000400050001960196519701975Time(a)0.93MMOilProd.Watercut1.00.20(MMB)35.00Legendinjectorproducer10ChallengeLowpressure&commingledwaterinjection,serioussinglelayerwaterbreakthrough,andseriousinterlayerandarealinterferences,resultedinquickwatercutrisingandoilproductiondecreasinginproducers.StrategyMaintaininghighandstableoilproductionforalongtermandincreasingwaterfloodingrecovery.TechniqueReservoirmanagementbyzone:Watershutoffandfracturing,basedonwaterinjectionbyzone.ResultWatercutrisingwascontrolled.Oilproductionwas1MMBOPDin1980.RecoveryFactorwasincreasedbymorethan10%inmediumtohighpermeablereservoirs.Phase2：Waterfloodingandreservoirmanagementbyzone11ChallengeProductiondeclinedinmainpayzones,undertheinfluenceofhighpermeablepayzoneswithhighwatercut,mid-lowpermeabilityzonesarepoorly-developed.StrategyImprovetheproductionfrommid-lowperm.zonestoextendtheproductionplateau.TechniqueFaciesdescriptionofsubdivisions,logginginterpretationofwaterfloodedzone,andenhanceproductionoflowproductionzone.ResultTheproductionwasmaintainedstableat1.03MMBOPDin1980s.Recoveryfactorwasincreasedby10%.Phase3：ReservoirmanagementbyZonesubdividing12ChallengeWhenprimarywellpatternenterthelaterstageofhighwatercut,thefluidratewillincreaserapidly,andfurtheroilproductionsustainingwaslimitedbynosignificantadditionofnewreserves.StrategyEnhancetheproductionfromtheexistingoilfieldstosustaintheoilrateandcontrolthewatercut.TechniqueIdentificationandevaluationofpotentialoftheunbookedreserves;Monitoringtechniqueofproducingperformanceofpoorandthinlayers;wellpatterninfillingtechnique;Comprehensivereservoirmanagementtechniques(zonation/wellpatternperfectingetc.).ResultProductionaddedfromtheunbookedreserves.Oilratesustainedat1.01MMBOPDin1995,andwatercutonlyincreasedby0.93%during1991-1995,therecoveryfactorincreased6.0%.Phase4Developmentadjustmentbyinfillingwellpattern13ChallengeMajorreservoirsenteredultra-highwatercutstage,waterfloodingrecoverydegreewasonly40%,andproducinglevelfromthinandpoorlayersandlayerswithunbookedreservesneedfurtherimprovement.StrategyExpediteEORdevelopmentandassociatedwatercutcontrollingandreservespotentialtapping.TechniqueDescriptionofheterogeneityinfluvialreservoirs;Polymerflooding,watershutoffandprofilecontrolinnon-effectivewaterinjectionarea/reservoirs.ResultTheproductionratefromEORwaskeptat200MBOPDforfiveyears.Recoveryofmid-highpermeablereservoirsincreasedbymorethan10%,Ultimaterecoverywillreach55%.Phase5：EORdevelopment1460.3880.2387.6489.22020406080100196019651970197519801985199019952000WaterCut（%)7-yearplateauevenwhenwatercutreached80%andhigher0.93MM0.93MM1.03MM1.0MM0100020003000400050006000Oilproductionrate（MMBOPD)1960196519701975198019851990199520001.21.00.20GreatachievementsLa-Sa-Xingoilfieldmaintained22yearsofstableproductionwithannualproductionmorethan50millionton

1529.1834.9841.6146.2849.3251.130102030405060198019851990199520002005Developphaserecovery（%）ContinuouslyImprovingRecoveryoftheLa-Sa-Xingoilfieldfrom29.18to51.13%。161.Divisionofdevelopmentphases2.Developmentstrategyandtechniquesfordifferentphases3.Mustdogoodpreparationinlastphasefornextphase.C.Summary174.Thepreparationfordifferentphases：productionperformanceandremainingoilmonitoringdataofeveryindividualsands;In-depthstudyofreservoirandremainingoil;FieldpilotinadvanceBytakingtheabovemethods,wecouldgraduallydeepenourunderstandingsonoilfielddevelopmentandensurethewellon-goingofthedevelopmentofthewholefield.18IIDevelopmenttechniquesinDaqingFinereservoirdescriptionRemainingoilevaluationTechniquesforoilproductionsustaining,watercutcontrollingandEOR19I）FinereservoirdescriptionWorkflowFoundationoffull-scaledfielddevelopmentFoundationoffirstinfilldevelopmentFoundationofsecondinfilldevelopmentFoundationofoptimizationofreservoirmanagementandEORUnbookedReservesevaluationCorrelationbydepositionalcycleZonalsedimentaryfaciesReservoirdescriptionIntraHeterogeneityEvaluationFoundationofwatercutcontrolandremainingoildevelopmentinthickzone201.Vertically:Subdivisionofdepositionunitssandzone

subzone

singlesandbody41bedsets

136sublayers

184singlesandbodiesTheminimalthicknessofsinglesandbody(0.2m)canbeidentified,evenwithpoorcontinuityofinterbeddedshalemarker,andthecurrentresolutionofwirelineloggingis0.2m.21BeforeSubdivision:allsandbodiesindifferentwellsseemedtobeingoodcontinuityandthewellpatternperfect.AfterSubdivision:realizethatthepreviouswellpatternwasincomplete.FaciesMapofSandGroupPuI-3ChannelsandunbookedChannelmarginChannelsandChannelmargin222.Laterally:SubdivisionofMicro-faciesIndividualsandbodymicrofacies

overbanklobe

crevasseSublayerMicrofaciesZonefaciesBasedoncoringandwirelineloggingdata，theminimumarealdepositunitandindividualsandbodycanbeidentified.>500m<300mOilsandshalechannelChannelmarginChannelChannelmargin23Onthebasisoffinereservoirdescriptionandarealfaciesanalysis,anadvanced3Dreservoirpropertiesmodelingworkflowisdeveloped,thenthefineandquantitative3Ddescriptionisrealized.sandthicknesspermeability

pore

sedimentarymicrofaciestype

主体砂

薄层砂

表外

泥岩

3.Facies-Controlled3DGeologicModelingMainsandThinsandUnbookedshale24singlechannelsandbodysinglepointbarsandbodyinterlayerdistribution4.IntrastratalheterogeneitydescriptionmethodforfluvialthickbedschannelAbandonedchannelChannelmarginSinglepointbarsandshale25Shutoffhigh-permeabilitypartinChannelsandstone0.3000.2500.550AfterPlugging,liquiddecreasedby100bbl/dOilincreasedby20bbl/d,Watercutwentdown6.3%Controllingnon-effectandlow-effectwaterinjectionCasestudyWatertake-inprofilechannelunbookedChannelmargin26Ⅱ）RemainingoilResearchIntegratedstudyofsealedcoringdata

Million-nodenumericalsimulation

IntegratedanalysisbycombiningdynamicandstaticdataArtificialNeuralnetworkidentification

Petrophysicalre-evaluationforthin&poorpaysandand

waterfloodedpaysandReservoirmonitoring27Overthepast40yearsinDaqing,aseriesoftechniques(includingevaluatinginitialsaturation,identifyingwater-floodedzones,andcorrectingcoredatabydecompressionanddesecration)aredeveloped.Morethan150sealedcoringwellshavebeendrilled,providingeffectivetechnicalapproachesforaccurateremainingoilstudy.1.IntegratedStudyofSealedCoringDatared：oilsaturationblack：watersaturationred：oilsaturationBlack:watersaturation28Itprovidesthebasisforselectingperforationzoneininfillwellsandworkoverinexistingwellswithhighwatercut.ComparisonofLoginterpretationandSealedcoringdataPermeabilitycoincidencerate:＞200mD＞80％50～200mD（thinsand）～80％＜50mD

～75％2.WelllogginginterpretationofWaterFloodedpaysands293.ReservoirmonitoringtechnologyInjectionProfileLoggingProductionProfileLoggingSeparateZoneSamplinginProducersandChromatographicFingerprintExaminingC/OandBehindCasingResistivityLoggingInter-wellMicro-seismicLoggingandpressuretesting30InjectionProfileLoggingtolocatehighpermeablelayersSmallgraindiameterisotopeBiggraindiameterisotope

Theflowratecurveshowsthattheinjectionvolumeoftheupperisbiggerthanthatofthelowerpart.Becauseoftheexistenceofporepassage,theisotopecurvewithsmallgraindiameterdoesn’tindicatethereality.Theisotopecurvewithbigisotopegraindiameterauthenticallyreflectsthewatertakingzones.631evaluateremainingoilsaturationtakemeasuressuchasre-perforating,watershut-off,fracturingreachtheaimofcontrollingwaterandenhancingoilproduction.C/OSpectrumLogging2232Multidisci-planary4.NumericalsimulationtechnologyQuantitativeandrefinedremainingoildescriptionneedsmultidisciplinarycoordinationanddigitalizedreservoirresearches.IntegratedworkplatformUnitedtechnicalstandardsCommonshareddatabaseIntegrationofsoftwarepackageKeepcompatibilityandunificationofworkflow,dataflowandsoftwareflowBytechnicalbrainstorms,Daqinghasdevelopedmaturedandadvancedtechnicalsoftware,accomplishedintegrationofappliedsoftwaresandestablishedtheworkplatformofmultidisciplinarycoordination.33WelllocationofXing-7CblockArea:11.9km2OOIP:4098.79×104t(315mmbbl)Reserves:1990×104t(145mmbbl)Watercut:89.48%Recoverydegree:24.12%CasestudyUsefacies-controlledmodelingtoestablishreservoirflowmodelfordifferentfacies34VerticalremainingoildescriptionrefinedtosedimentaryunitsHighwatercut,highrecoveryfactor,InternalpotentialHighwatercutandlowrec.factor,WatercontrolLowwatercut,lowrecoveryfactor,EnhanceproductionMediumwatercutandrec.factor,Furtheroptimization35LateralremainingoildescriptionrefinedtosedimentarymicrofaciesSedimentaryfaciesbeltsmapofresearchedPⅠ2unitRemainingoilsaturationdistributionmapofresearchedPⅠ2unitSedimentaryfaciesbeltsmapofresearchedSⅡ4unitRemainingoilsaturationdistributionmapofresearchedSⅡ4unitchannelChannelmarginunbookedchannelMainsheetsandSubsheetsandThedistributionofRemainingoilisdispersedandthemajoritymainlyexistsinchannelsands36HighmatchingratiobetweenthepredictionandactualresultsTime(Year)Liquidrate（blpd）Oilrate（bopd）Averagewatercut（％）Naturaldeclinerate（％）Averagewatercutrise/a（%）Waterinjection（103m3）Inj./prod.200380K8.0K90.0918.031.494967.31.14200475K6.8K90.9615.500.874604.61.192005Predicted71K6.1K91.4314.000.474211.41.15Actual68K6.0K91.2014.010.244042.01.16SummaryinBlockXin-737Ⅲ）OilSustain,watercutcontrolandEORtechnologySeparate-zoneinjection&productionInfillwellspacingadjustmentEOR381、separate-zoneinjection&productiontechniqueBasedonthereasonablecombinationofoillayers,byconductingtechniqueslikeseparate-layermonitoring,adjustmentandshutoff,optimizedinjectionandproductionadjustmentaswellasseparate-layerinjectioncouldberealized.

Separate-zonewaterfloodingwithinthesamewell

A.DevelopmentadjustmentbyzoneInj.Pr.decreaseNochangeincreaseincreasedecreaseshutoffFrac.39B.OptimizationofreservoirmanagementTheoptimizationofreservoirmanagementfurtherfocusesonwellpatternadjustmentamongdevelopedlayers.controlwatercutforbasicwellpatternwithwatercutofmorethan90%.Adequatelyincreaseliquidproductionforfirst-roundinfillwellsbutthekeyissueistodrillsecondaryinfillwellsinloworno-watercutlayerstopromoteliquidproduction.Liquidproductionratio%oilproductionratio%40Thistechnologystillplaysanimportantroleduring2000-2005whenwater-cutreaches90%andmore1991-1995:1.liquidproductionrateincreasedby1.17%andwatercutjustincreasedby1.2%2.346millionm3waterissaved3.Economicefficiencyof2.0billionUSDisincreasedCasestudy41WellpatternchangingmapofLa-Sa-XingoilfieldInitialwellpattern(12.3wells/km2）Primaryinfillwellpattern(26.7wells/km2）Secondaryinfillwellpattern(45.4wells/km2）

Tertiaryinfillwellpattern(70.4wells/km2）2.Infillwellpatternadjustment500m250m150m100m二secondaryinfillFirst-roundinfillBasicwellpatternTertiaryinfill42

Thefirst-roundinfillwellpatternadjustment

From1981to1991:3.8Bbblreservesincreasedfromthe11000first-infillwellsinLa-sa-xingoilfieldbasicwellpatternComingledwaterinj.Target:thepoor-developedmediumandlowpermeabilityreservoirsinbasicwellpatternStrategy:dividedreservoirsinto2-3sectionsMeasure:drillingchannelunbookedMainsheetsandSubsheetsand43Second-roundinfillwellpatternadjustmentTarget:theunbookedreserves.Thezoneswithpermeability=<20mDandoilsaturationdownbelowthecutoffforproduction,havebeendevelopedbysecondaryinfillwells.beforeadj.Afteradj.UnbookedreserveschannelunbookedMainsheetsandSubsheetsandBelt-shape,thin-layer,speckle-blocky44From1991to2000

morethan17000secondaryinfillwellsweredrilledrecoveryfactorincreasedby6%Resultsofsecond-roundinfilling45EORstudywasstartedin1960sinDaqingoilfield,andthepolymerfloodingismainmethodforEORinDaqingoilfield,whichwasputintoproductionin1996throughselection.3.EORtechnique46Corewashprofileairpermeabilityum2oilsweepefficiency（%）Corewashprofile

airpermeabilityum2oilsweepefficiency（%）01.02.03.04.0354555657535455565756-inspection27well6-inspection26well01.02.0