尼日利亞區(qū)塊鉆井設(shè)計模板：SC-8井鉆井設(shè)計

UERL/SIPECSTUBBUERL/SIPECSTUBBCREEKPROJECTSTUBBCREEKMARGINALFIELDWELLSTUBBCREEK-8GEOLOGICALPROGNOSISANDDRILLINGPROGRAMMEPAGEUniversalEnergyResourcesLtdinconjunctionwithitsTechnicalPartners–SINOPECiUniversalEnergyResourcesLtdinconjunctionwithitsTechnicalPartners–SINOPECiCONTENTSTOC\o"1-2"\h\z\uSectionASTUBBCREEK-8GEOLOGICALPROGNOSIS iListofFigures iListofTables i1.WellBasicInformation 12.NaturalandGeographicGeneralSituation 23.GeneralGeologicSituation 33.1RegionalGeologicGeneralSituation 33.2FieldGeologicGeneralSituation 34.ReasonsandObjectivesofDrilling 54.1Reasons 54.2Objectives 65.DesigningStratigraphicProfile,WellDepthandPretestingDepthofOilandGasLayers 75.1DesigningStratigraphicSection 75.2PredictionDepthofBearingOilandGasLayers 75.3DesigningWellDepth 86.PorePressurePrognosisandDrillingFluidRequests 96.1WellFactualPressureResult 96.2FormationPressurePrognosisCurve 96.3PropertiesofDrillingFluid 97.Coordinates(SurfaceandTargets) 108.RiskAssessment 119.RequestsonData 129.1CuttingLogging 129.2CoringandSidewallCoring 129.3DrillingFluidLogging 129.4FluorescentLogging 139.5Drilling-timeandGasAnalysisLogging 139.6EngineeringParameterLogging 149.7GeophysicalWellLogging 149.8PracticalitySection,SamplesCollecting,SelectingandDelivering 1510.DemandsonWellTrajectoryQuality 1610.1Casing 1610.2Trajectory 16SECTIONBDRILLINGPROGRAMM 281. CASHESISSUES 281.1 Community 281.2 HSE 281.3 SECURITY 282. WELLSUMMARY 293. WELLINTRODUCTION 303.1 WellObjective 303.2 GeneralWellData 303.3 ProgrammeSummary 303.4 PorePressurePrognosis 313.5 WellSchematic 333.6 Coordinates(Surface&Target) 343.7 PlanSectionInformation 343.8 CasingSchemeSummary 353.9 CementProgramme 363.10 RequiredCementQuantity 374.MudSystem 384.1 Generalnotes: 384.2 OperationalGuidesforEachSection 394.3 MudParameters 435 POTENTIALDRILLINGHAZARDS 445.1 HoleCleaningProblems 445.2 GasCutMudandKick 445.3 BoreholeInstability 446 POSSIBLEHAZARDS&MITIGATION 457 DETAILEDDRILLINGPROGRAMME 467.1 GeneralNotes 467.2 RigMove 477.3 Welltrackcontrolandanticollisionscanning 487.4 DrillTopHoleSection-17-1/2”SurfaceHoleto±2,005ft 497.5 Run&Cement13-3/8″CasingandWellhead&BOP 507.6 Drill12-1/4″Section 527.7 Drill8-1/2″Section 568 DIRECTIONALPLAN 618.1 DirectionalPlanObjectives 618.2WellTrajectory 619 DETAILEDCOMPLETIONPROGRAMME 629.1 GeneralNotes 629.2 InstallTubingHeadandBOPsstack 639.3 DriftandCleanwell 639.4 TCPforD8andD3Reservoirs 639.5 CompletewellasTSM(TwoStringMultiple)producer,withSCVsinstalledonbothstrings 649.6 WELLHEADMAKEUP 6710. TIMEESTIMATE 6810.1EstimatedDrillingTime 6810.2WellS-8appraisalDrillingTime-DepthGraph 6911. WELLCOSTESTIMATE 7011.1WellCostEstimate 7011.2WellCostEstimate(continue) 7111.3WellCostEstimate(continue) 7112. WELLCOMPLETIONDESIGN 72APPENDIX1CORRELATINGWELLS 77APPENDIX2WELLCONTROLDESIGN 80ResearchCenter,ResearchCenter,SINOPECInt’lPetroleumE&PCo.NigeriaLtd.(SIPEC)iSectionASTUBBCREEK-8GEOLOGICALPROGNOSISListofFiguresFigure1LocationMapofSTUBBCREEKFieldFigure2SC-8LocationPlanningFigure3DepthStructureMapofD3Figure4DepthStructureMapofD8Figure5SeismicSection(IN64)ofSC-8(deviatedwell)inSTUBBCREEKFieldFigure6SeismicSection(CR106)forWellSC-8(deviatedwell)inSTUBBCREEKFieldFigure7SeismicSection(ArbitraryLine)throughSC-8WelltrajectoryinSTUBBCREEKFieldFigure8SeismicSection(ArbitraryLine)throughSC-2—SC-8WellinSTUBBCREEKFieldFigure9ReservoirProfileofSC-8(deviatedwell)inSTUBBCREEKFieldFigure10PredictionCurveonFormationPressureofPlannedWellFigure11SurfaceLocationofSC-8(ExtraterrestrialPhotographofSTUBBCREEKField)ListofTablesTable1ProvedReservesofSTUBBCREEKFieldTable2SC-8StratigraphicSequenceTable3PredictionsonSubseaVerticaldepthinSC-8Table4ActualMeasurementonPressuresinSTUBBCREEKFieldTable5DataofPredictedPressureofSC-8Table6DrillingFluidPropertiesofPlannedWellTable7OpenholeLoggingProgramTable8CementBondLogorCementEvaluationLoggingProgramTable9CasingSizeandSettingDepthoftheDesignedWellResearchCenter,ResearchCenter,SINOPECInt’lPetroleumE&PCo.NigeriaLtd.(SIPEC)PagePAGE27of841.WellBasicInformationWellname:SC-8(Deviatedwell)Classification:DevelopmentWellType:DeviatedWellwithtwotargetsConcession:OML-14Typeoflocation:OnshoreSurfacecoordinatesE:636056m，N：Targetandcoordinate：No.1target:6075ftssTVDCoordinate:E:636565m，N:63420Layer:D3No.2target:7570ftssTVDCoordinate:E:636832m，N:Layer:D8Elevation＝23.ProposedTVD 7940ftss（2420Rig Spuddate N2.NaturalandGeographicGeneralSituationNigeriaissituatedin4°-14°Nandcontrolledbythetropicalcontinentalairandequatorialmarineair,whichhavedifferentinfluencestowardsvariousplaces.Duetothevastterritoryandvariedtopography,threebioclimaticzoneshavebeenclassifiedfromsouthtonorthwithdecreasedprecipitation:tropicalrainforestclimate,tropicalprairieclimateandtropicalsemi-desertclimate.NigerDeltaislocatedatthetropicalprairieclimatezone.FromApriltoOctober,itisrainyseasonswithheavyrainingusts,thetemperatureisgenerally26-32℃anditisverycoolbothinthemorningandatnight;betweenNovemberandMarchnextyear,itisdryseasonswithairtemperature28-34℃.STUBBCREEKField,withanareaofabout42km2,islocatedinthecoastalswampbetweenOML-14andOML-13inNigerDelta,Nigeria（Fig.1）.Thesouthernandsoutheasternboundariesofthefieldareneartothecoastline.Belongingtoatropicalrainyclimate,theblockisacoastalplainwhichiscoveredbyfarms,plantations,shrubsandwastelands.Thereisariverwiththewidthof30-50m

3.GeneralGeologicSituation3.1RegionalGeologicGeneralSituationAtthecontinentalmarginoftheWestAfrica,NigerDeltaProvincelieswithinGuineaGulf.ThewesternboundaryofthebasinisBeninGulf.ItseastpartextendsintoCameroonwhichknownasAdulaorCameroonBasin.ThenorthernboundaryisdefinedbyAnanburaBasin.Spatially,itisadeltaofNigerRiverwhichextendssouthwardintoGuineaGulf.ItisnotonlyatypicaldevelopingCenozoicdeltabasinatpresent,butalsoalargestregressionbasinintheworld.Theprovincetotallycovers300,000km23.2FieldGeologicGeneralSituation3.2.1StratigraphicAccordingtoanalysisofstratigraphiccorrelation,thedevelopedformationsinmarginalfieldareincorrespondentwiththoseinNigerDeltabasin,andmaindepositionalstrataareinTertiarysystem,whichcanbedividedintothreeformationsfromupperlayerstolowerlayers,Beninformationincontinentalenvironment,AgbadaformationinthetransitionalenvironmentandAkataformationinmarineenvironment,amongwhichAkataformationisthemainsourcesequenceandAgbadaFormationisthemainhydrocarbon-bearingformation.SandbodiesshowgoodlateralcontinuityinSTUBBCREEKField.3.2.2.StructuralFeatureSTUBBCREEKFieldislocatedintheeasternpartoftheFmacrostructure,oneofthe5macrostructuresofOML-13.Generally,itisarolloveranticlinalstructurecontrolledbyaregionalmastercontrolfaultinthenorthandcutbyseverallocalminorfaultsinthesouth,whichformsfaultanticlinesandfaultnosetraps,andthestructuralcrestshiftssouthwardgraduallyfromshallowtodeepformation.Becauseofthefaultsinthedeepformation,therolloveranticlinestructuresaremorecomplexthanthoseintheshallowpart.Thefaultsintheareaaremainlyextendedineast-westdirectionwithsouthwardinclination,anddipangleisfrom35oto57o.Fifteenfaultshavebeeninterpreted.Generallythefaultdisplacementis60-500ftandtheextendeddistanceis3280-27230ft(1000-8300m).3Dseismicdatainterpretationindicatesthat5structuraltrapshavebeendevelopedintheblock,amongwhichS2trap（Fig.2）,afaultanticline-faultnosetrap,locatedinthenorthoftheblockisthelargest,withlargeclosureheightandwelldefinedverticalsuccessionofreservoirs.3.2.3HydrocarbonReservoirFeatureAffectedbythefaults,thesevenoil-gaslayersinSTUBBCREEKFieldaredominantlycontrolledbyfaultsandrolloveranticlines.Mainreservoirtypesare:anticlinereservoirs,faultedanticlinereservoirsandfaultnosereservoirsControlledbyrolloveranticline,CandDsandbedshavebeenencounteredinSTUBBCREEKFieldandsevenoil-gasbearinglayershavebeenidentified,whichmainlydistributeatthefootwalloffault=1\*GB3①and=2\*GB3②withburialdepthof3665-7630ft(1117-2326m)（Fig.2）.Basedonexistingdata,C3,C7,C8andC9areconsideredtobegaslayersandD3,D5,D8areoillayers.Verticallythehydrocarbonlayershavethecharacteristicsof“uppergasloweroil”.Horizontally,however,withthinnersandbodiesfromnorthtosouth,thehydrocarbonlayersbecomethinnersouthwardaswell.

4.ReasonsandObjectivesofDrilling4.1ReasonsTheresearchresultsshowthatS2trapisdevelopmenttarget（Fig.2）.AccordingtotheFDP,thewellSC-8isoneproductionwell.TrapsarereliableandgoodtypeComprehensiveresearchon3DseismicdatainterpretationandgeologyindicatethatS2trapisfault-nose—faulted-anticlinetrap,whichisreliablewithlargearea（Fig.3,4）.ThereservoirtypeofS2trapisfault-nose—faulted-anticlineandcontrolledby=2\*GB3②fault,andthehydrocarbonisconcentratedinthestructuralhighpositionandhastheshapeoftoothbrush.HistoricalwellanalysisshowsthatC9andD3havebeenpenetrated,whicharelocatedinthelowerpartofWellSC-2,amongwhichD3isoillayerwithnetthicknessof15.5m,andC9isgaslayer(oil-gaslayer);WhileD3locatedinthehigherpartofSC-3isabsent,D8isoillayerwiththicknessof5.2m.Therefore,hydrocarbonisabundantinthehighpositionofTrapS2（Fig.5,6,7,8）.Besidesthat,theattributeanalysisof3Dseismicdataindicatestheseismicreflectionisabnormal.ReservoirsarewelldevelopedandreservesscaleisrelativelybigManyoil/gaslayersareexistedinS2Trapwhichhasgoodphysicalproperties.Thehydrocarbonbearingintervalisabout1400-2350m,andreservoirthicknessisgenerally7-70m,buttheoilismainlyaccumulatedinmid-depth.ReservesofS2TrapshowTable-1,itshowsthatithasdevelopmentvalues.Table1ProvedReservesofSTUBBCREEKFieldLayerOOIPRecoveryReservesOil(MMbbl)%Oil(MMbbl)UD37.43503.72LD31.6300.48D83.73301.124.2ObjectivesDevelopmentwellSC-8isproposedtobedrilledontheeasternhigherpositionofS2trapinSTUBBCREEKField.Consideringthesurfacecondition,thedevelopmentwellisdesignedtobeadirectionalwellwithtwotargetsatthenewwellsite.(Fig.9)ThewellisexpectedtomakefartherclearoillayerdistributionofD3inTrapS2.ConfirmoillayerdistributionofD8inTrapS2.DevelopD3andD8layers.

5.DesigningStratigraphicProfile,WellDepthandPretestingDepthofOilandGasLayers5.1DesigningStratigraphicSectionSC-8isexpectedtopenetrateasimilarstratigraphicsequencewhichisalsofoundinotherwellsoftheField.Lithologicexpectationsareasfollows:Table2SC-8StratigraphicSequenceDepth(Interval)TVDSSLithofaciesSand%FormationHorizonRemarks0—2860Continentalsand95BeninContinentalloosesandwithminorshale&lignite.MudLosesareexpectedduringdrilling2860—5Transitional45-70AgbadaCTransitionalsandandshaleintercalations.5410ftTransitional10-40AgbadaDTransitionalsandandshaleintercalations.5.2PredictionDepthofBearingOilandGasLayersHydrocarbonlayersareexpectedatdepthof4000-7600ftssinSC-8,thedetailscanbeseenfromTable3.InviewofuncertaintiesassociatedwithT-Dconversion,thedepthcouldbealittlehigherorlower.Thusgreatattentionshouldbepaidduringdrillingprocesstoreducedepthvariationtotolerance.Table3 PredictionsonSubseaVerticaldepthinSC-8LayerIntervalsTVD(ftss)Oilintervals(ftss)InclinationAngle(degree)RemarksAgbada2860C33860—4000C74350—4400C94720—5100D15410—5580UD36075—61356075—6135NW1.12PredictedoilLD36185—63006185—6200PredictedoilD87570—76007570—7600NW3.83Predictedoil5.3DesigningWellDepthBasedonthecurrentpredictions,theTVDwouldbeexpectedat7940ftss(+/-100-200ft),whichensuresaloggingpocketshouldbeavailabletoallowforfullpetrophysicalevaluationofthetargetsands.6.PorePressurePrognosisandDrillingFluidRequests6.1WellFactualPressureResultTwofluidsamplingshavebeenacquiredfromSTUBBCREEKField,andtheresultfromSC-2showsthatformationpressurein6186ft(1885.2m)ofD3is2739psi(18.90MPa),withpressuregradient1.0025MPa/100m(0.4428psi/ft);whileresultfromwellSC-5indicatesthatformationpressurein6095ftss(1858m)ofD3is2693psi(18.58MPa),withpressuregradient0.9998MPa/100m(0.4418psi/ft)(Table-4Table4ActualMeasurementonPressuresinSTUBBCREEKFieldNotes：1psi=0.00689Mpa6.2FormationPressurePrognosisCurveIncombinationwithregionalgeologyandtheactualmeasurementresults,itispredictedthatthereisnoabnormalpressureamongtargetdepthinthisplannedwell.Accordingtoregionalgeologicaldataandmeasuredpressuresondrilledwellsintheblock,theformationpressureoftheplannedwellhasbeenpredicted(Table5,Fig.10).Table5DataofPredictedPressureofSC-86.3PropertiesofDrillingFluidAccordingtopressureprediction,themuddensityshouldnotbehigherthan1.2,andtherequirementsondrillingfluidpropertiescanbeseenfromtable6.Muddensityshouldbeincreasedifhighlyoverpressureispenetratedduringthedrillingprocess.Table6DrillingFluidPropertiesofthePlannedWellDepth（ft）TypeDensity(ppg)Waterloss%0-2000Water-basedmud8.6-9.2<62200-9750Synthetic-basedmud9.5-10.8<27.Coordinates(SurfaceandTargets)Consideringthesurfacecondition,SC-8designedatthenewwellsite(Fig.11).TheapproximatesurfacelocationcoordinatesofSC-8areE：636056mandN：64124mNo.1targetcenter:E636565mandNNo.2targetcenter:E636832mandN

8.RiskAssessmentAccordingtooil&gasdistributionfeaturesanddataanalysisavailable,designedwellmaybepenetratenaturalgaslayerinshallowzonecloseattentionmustbepaidtoit.Fromthedataavailableatpresent,norelatedinformationonnaturalgascontainingH2Shasbeencollected.

9.RequestsonData9.1CuttingLoggingLoggingInterval：4200ftss-TDLoggingSpace：Samplecollectedonceevery10ftfrom42Infillsamplecollectiononceevery5ft,ifoilandgasshows(directshowsorgaslogginganomaly)isencountered.Well-sitegeologistshoulddeterminethesuitableintervaltocollectsampleasdrillingprogresses.RequiredSamples：Twosamples,oneisforpreservationandtheotherforanalysis.Eachsampleshouldweigh1000g.Samplestobecollectedaccordingtolagtimestrictly(lagtime:giveprioritytoactualmeasurementandcrosscheckbycalculatingtheoretically),actualmeasurementofonelagtimeper100mdrilled.Wetsamplestobecollectedinwetsamplebags,labeledappropriatelyandpackageforonwardtransfertostoragefacility.9.2CoringandSidewallCoring9.2.1CoringNil9.2.2SidewallCoringNil9.3DrillingFluidLogging9.3.1MudLoggingDensityandviscosityofmudshouldbemeasuredatregularlength/timeinterval.Semi-performancedataandfullperformancedatashouldbemeasuredonceevery100mand200mseparatelyfrom2000-3000ft.However,semi-performancedataandfullperformancedatashouldbemeasuredonceevery50mand100 TocontinuouslymeasurethedensityandviscosityandmeasurefullcyclicperformancedataonetimeeveryoneortwocycleswhenthereishighincreaseinROPorwhenoil-gasimmersionsoccur.Whenencounteringhydrocarbonzones,runthebittothebottom,andmeasurethedensityandviscosityonceevery10minutesthenobservethereactionthereafter.Iflosscirculationoccur(orwellkick),recordtheamountsofcirculationloss(ortheamountsofwellkick),property,timeanddepth,measuretherateofcirculationlossandanalyzeitscauseandthenworkoutthepreventivemeasures.9.3.2CirculationObservationWhenobviousoil-gasshowsareencountered,firststopdrilling,thencirculatethemudsoastoascertainhydrocarbonzonesordeterminefurtherstepbygeologicandgasloggingmeasurements.Meanwhile,collect2000mlofoilbearingdrillingfluidforanalysisandobservegaslogdisplayandthechangesofmudpitlevelandthenmeasurethemudproperties.Closelyspacecuttingsamplesshouldbecollectedonceevery5ftwithdetailsrecordingaccordingtolagtime.9.4FluorescentLoggingSampleswillbesubjectedtofluorescencetestwheneveranoil-gasshowoccurorinsuspiciousintervalsbycollecting2gcuttingsanddunkingin5mlchloroformsolutionfor6hours.9.5Drilling-timeandGasAnalysisLoggingDrillingTimeDatashouldberecordedonceevery20ftfrom2000-4200ftandonceevery10ftfrom42GasLoggingMakecontinuousmeasurementswiththefullyautomaticgasloggingapparatusandprovidedataforgeologistsonsitetofinishdrawingaccordingtothepointdistanceofcuttinglogging.Whenencounteringoilandgasshows,measurementswillbetakenonceevery5ftandbeanalyzedonsitesoastoprovideabnormalintervalsandmeasuretheaftereffects.Besidesthattheaftereffectsshouldalsobestrengthenedduringeachtripping.9.6EngineeringParameterLoggingAlldatasuchasformationpressure,fracturepressure,andlosscirculation,kick,propertiesofdrillingfluidandengineeringparameterswillbemeasuredcontinuouslyfromsurfacecasingtoTD.Thiswillbedonebyusingtheacquireddatasoastopredictformationpressure,abnormalpressure,etc.9.7GeophysicalWellLogging9.7.1OpenHoleWirelineLoggingCarryoutawholesetofopenholeloggingwhenfinishdrillingtothepredetermineddepthandtheloggingprogramincludesthefollowings:Table7OpenholeLoggingProgramLOGTYPE12-1/4”Hole8-1/2”Hole1HRI-DFLYesYes2GR-CALYesYes3SDLT-DSNT-FWSTYesYesNotationCombinedprofile:HRI-DFL,GR-CAL,SDLT-DSNT-FWST.Logscaleswillbe1:200.Standardprofile:HRI-DFL,GR-CAL.Logscaleswillbe1:500.AbbreviationsHRIHighResolutionDualInductionToolsDFLDigitalFocusedLogGRGammaRayToolCALCaliperSDLTSpectralDensityToolDSNTDualSpacedNeutronToolFWSTFullWaveSonicToolCAST_VCircumferentialAcousticScanningToolCBLCementBondLog9.7.2CasedLoggingCementevaluationloggingprogramcanbeseenfromtable8.Table8CementBondLogorCementEvaluationLoggingProgramLOGTYPE133/8”95/8”7”GR-VDL-CBL–CAST_V-CCLYesYesYes9.8PracticalitySection,SamplesCollecting,SelectingandDelivering(1).Designapracticalitysectionorcollectrocksampleswhenpenetratingthebigintervalofoil-gasconcentratedlayers.(2).Analyzetheselectedmineralsamplerocksintheoil-gasshowinterval.

10.DemandsonWellTrajectoryQuality10.1CasingAccordingtocasingpracticesofdrilledwellinNigerDelta,casingprogramandcementtopofthiswellaresuggestedasfollows:Table9CasingSizeandSettingDepthoftheDesignedWellCasingsize20″133/8″95/8″7″Settingdepth（ft）TobedeterminedCementtop（ft）SurfaceSurfaceSurfaceCasingdesignaccordingtoengineeringneed.10.2TrajectoryInordertoensurethetargetlayerstobepenetrated,thehorizontaldisplacementofradiusoftargetcentershouldbenolargerthan100ft(30m).STUBBCREEKMARGINALFIELDWELLSTUBBCREEK-8STUBBCREEKMARGINALFIELDWELLSTUBBCREEK-8GEOLOGICALPROGNOSISUERL/SIPECSTUBBCREEKPROJECTFigure1LocationMapofStubbCreekFieldSTUBBCREEKMARGINALFIELDWELLSTUBBCREEK-8GEOLOGICALPROGNOSISSTUBBCREEKMARGINALFIELDWELLSTUBBCREEK-8GEOLOGICALPROGNOSISUERL/SIPECSTUBBCREEKPROJECTFigure2SC-8WellLocationMapinStubbCreekFieldCR106INCR106IN64SC-8ArbitraryLineFigureFigure3DepthStructureMapofD3FigureFigure4DepthStructureMapofD8AgBC3C7C9AgBC3C7C9D1D3D8D8SC-8SC-3FigureFigure5SeismicSection(IN64)ofSC-8(deviatedwell)inSTUBBCREEKfieldSC-8SC-8AgBC3C7C9D1D3D8D8FigureFigure6SeismicSection(CR106)forWellSC-8(deviatedwell)inSTUBBCREEKfieldAgBC3AgBC3C7C9D1D3D8D8FigureFigure7