CentreforOffshoreResearchandEngineering(CORE)

atMaritimeInstitute@NUSY.K.Chow

Director,MaritimeInstitute@NUSExecutiveDirector,CORE

Y.S.ChooDirector(Research),CORE

MissionandKeyObjectives

MissionTobealeadingCentreinresearch&development,andeducation&manpowertrainingfortheadvancementoftheoffshoreandmaritimeindustry.

KeyObjectives Todevelopstrategicresearchanddevelopmentprogrammes

thatresultinknowledgegenerationandintellectualpropertycreation

Todevelop educationprogrammes andmanpowertrainingforSingaporesoffshoreandmaritimeindustry

ToactivelypromoteR&Dcollaborationwithindustry,A*STARresearchinstitutes and tertiaryinstitutionstotransformSingaporeintoanoffshoreandmaritimehubofglobalsignificance

KeppelProfessorship ProfTorgeir Moan,NTNU(Dec2002 Dec2006) ProfAndrewPalmer

LloydsRegisterEducationalTrustProfessorship ProfPeterMarshall,formerlyShell(Mar2007Mar2009) ProfChooYooSang

MaritimeTechnologyProfessorship(MPA) ProfRodneyEatockTaylor,OxfordUniversity ProfPaulTaylor,OxfordUniversity ProfJohnDempsey,ClarksonUniversity DrJohnHalkyard,formerlyTechnip

EDBSubseaEngineeringProfessorshipsProgramme DrBil Loth,WDLothandCompany

Professorships

OffshoreTechnologyResearchProgramme(A*STAR,MPA)15projectsincludingsmartsensing;reassessment,retrofitting,andrepairofoffshorestructures;intelligentdeepwater mooringsystems;LNGsloshing;subseaprocessing;AUV;methanehydrates;pipelinesoilinteraction;jackupfoundations;plateanchors;torpedoanchors

MultiphaseFlowAnalysisforDownhole Oil&GasEquipment(A*STAR)

7projectsaddressingconstitutive andnumericalmodelingofmultiphaseflow,andmultiphaseflowprocessesandissuesconcerningflowassurance;heavyoilproductionanddownhole equipmentdesign

MaterialsInnovationforMarine&OffshoreIndustry(A*STAR)6projectscoveringmainlydesignandanalysisofcompositerisersandjoints;fatigue,durabilityandimpactsurvivabilityofcompositerisers;studyonnovelcompositematerialsforrisers

MajorResearchProgrammes

ProjectSponsors:AmericanBureauofShipping,ClassNK,Densit,Lloyd'sRegister,McDermottInternational,Petronas Carigali,TataSteelResults: Largescalelaboratorytestsdemonstratethatthepresenceofinfilledgroutchangessignificantlythejointstiffnessandfailuremode.Numericalanalysesabletocapturetheobservedjointbehavior.CurrentISOrecommendationssignificantlyunderpredictjointstrength.ResearchscopeanddetailsforPhase2ofJIPbeingfinalised.

JIPonStaticandFatigueStrengthofGroutedTubularJoints

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IMPROVEDGUIDELINESFORTHEPREDICTIONOFGEOTECHNICALPERFORMANCEOFSPUDCANFOUNDATIONSDURINGINSTALLATIONAND

REMOVALOFJACKUPUNITS

ProjectSponsors

ProjectTeam

Research &Development

MethodVerification

FieldData

IndustryPractice

InSafeJIP

WorkScope Siteinvestigation&labtesting Spudcan bearingcapacity

predictions;punchthrough Spudcan operationrelatedissues

InSafe JointIndustryProject

American BureauofShipping

GEODanishGeotechnicalInstitute

NobleDrilling

Braemar Falconer GLNobleDenton PremierOil&GasServices

ConocoPhillips GlobalMaritime PremiumDrilling/COSL

DONGEnergy HSE UK ShellUKLimited

ENSCOInternational

KeppelOffshore&Marine

Transocean(GlobalSantaFe)

ExxonMobil Maersk Drilling

Fugro Singapore Matthews Daniel

JIPonImprovedPartialJointPenetration(PJPplus) WeldedTubularJointsObjective: Toexaminethefatigueperformanceofanewtypeofweldingdetails(PJP+)forcriticaltubularjointsinoffshoreplatformssubjectedtocyclicactions.ProjectSponsors:

JIPonSpudcanPileInteractionObjective:TocarryoutcentrifugemodeltestsandlargedisplacementFiniteElementsimulationstostudythemechanismofspudcanpileinteractionandproposerationaldesignmethodology.ProjectSponsors:

JIPonSpudcanFootprintRemediationObjective:Toinvestigatetheeffectivenessofvariousmitigationmeasuresthroughcentrifugephysicalmodelingandadvancednumericalsimulations.ProjectSponsors:

JointIndustryProjects(JIPs)

SomeChallengesinDeepwater Technology

CourtesyofEmersonProcessManagement.

SubseaSystems MultiphaseFlow SubseaProcessing MultiphasePumping MultiphaseMetering ProducedWaterSeparation ConditioningMonitoring&

Control AUV

Pipelines Pipelines PipelineSoilInteraction Geohazards MethaneHydrate

OffshoreStructuralSystems Floating

Structures Innovative

StructuralSystems

Moorings&Risers Foundation

Systems MarineOperations

StructuralIntegrityManagement

WaveStructureInteraction

Source:seabreezes.co.im

CoupledResponseofSidebySideOperations

SurfaceResonanceinGapforBeamSeaSurfaceResonanceinGapforHeadSea

Motivation: ConcernsforfloatingsystemsduringsidebysideoperationswhichcanresultinhighlynonlinearresponseApproach: DIFFRACTandOpenFOAMdevelopmentExample: FreeSurfaceResonanceinnarrowgapforFPSO/FLNGandtankeroperations

InnovativeStructuralSystems

Motivation:Structuralweight andstrengthimportantforfloatingstructuresApproach:Maximise structuralperformancethroughinnovativeschemes(e.g.differentconcrete/grout,Jhooks,interfacetexturing)Example: IntegratedSteelConcreteSteelSystemThroughLaserWelding

Results:Highlyductilebehaviour (CDD1)withultimatestrength1300%higherthanplaingroutspecimen.PossibleApplications:doublehullsideshellsorbottom,impactbarrier,fire&blastwall

Typeofbeam Ultimate LoadkN

PlainGrout 2.6

Groutwith top+bottomplates 3.8

Integrated SCSCSD1 24.7

Integrated SCSCDD1 36

StructuralIntegrityManagement(SIM)ofOffshoreSystemsMotivation: Structural/Assetintegrityiscriticalforsafeoperationsoffixedandfloatingoffshoresystems.Progress: Systemsapproachoneffectsofextremeenvironmentaleventsonstructuralandfoundationresponses.Example: Reassessmentofoffshoreplatforms

Pushoveranalysis

Extremewaverepresentation

SIMRelatedR&DinCORE:Structuralhealthmonitoring,fibre optic andlaserbasedsensing,fatigue&fracture,strengthenhancement

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Experiments

Force Prediction

Force with Current Blockage

New Prediction in Regular Waves

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Motivation:Improvedpredictionofwaveandcurrentloadingsoncomplianttowers partlyinresponsetoBPMacondo accident,pushfordrytreesolutions forcesandresponsesareoverpredictedusingconventionalapproach

Joint Collaboration NUS / Oxford

Currentonly blockageWave+Current extrablockage

Findings:

Reanalysisof tanktestsfromAllender &Petrauskas Chevron(OTC1987),2.5m/scurrent+regularwaves

EffectsofCurrentBlockageonOffshoreStructures

Designapproachforcomplianttowers:loadsresistedbycombinationofdynamics+strength

OffshoreRiserArrays

ObjectiveAccurateandefficientnumericalmodelingofvortexinducedvibration(VIV)suppressiondevicesforriserarraysathighReynoldsnumber:

Determinemutualinteractionsofrisers Findelegantandeffectivemeansto

suppressVIV

ResearchMethodologyNonlinearFluidStructureInteraction

Noveliterativestaggeredprocedure Stronginertialcouplingeffectsforlong

risersatmassratiom*O(1)

FatigueAnalysisandLifePredictionofCompositeRisersObjectiveToinvestigatethelongtermbehaviorandlifeofcompositerisersundercyclicfatigueloadingsinseawaterenvironment.

ResearchMethodology Fatiguetestsofcompositematerialsusedinrisersunderdifferentstressratios;

FatiguemodelbasedonmastercurvesandPuckscriterionforlongtermandcyclicloadingconditions;

Damagemechanismstoaccountfordamageaccumulationduringfatigueloadings;

Seawaterenvironmenttobeconsideredinthefatigueanalysis.

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Test data Fitting curve

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Composite riser(joint)

Fatiguemastercurve

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ExperimentalData(Songetal.,2006)

PlateAnchorsforPermanentMooringinDeepwaterMethodology : Geotechnical centrifuge experiments Large displacement finite element analysisKey considerations: Lossofembedmentduringkeyingreducesanchor

capacityduetoshallowerembedmentinweakersoil

Soil remoulding during keying will further degradeanchor capacity

Long term capacity of plate anchor

NUSCentrifuge

SEPLA

Source:ATPOilandGasCorporation

Deepwater DynamicallyInstalledAnchorsObjectiveToimprovethecurrentdesignmethodologyfordynamicallyinstalledanchorsbyfocusingonquantificationofdesignunknownsandinstallationuncertainties.

ResearchMethodologyAnchor CurrentInteraction

ComputationalFluidDynamicsSimulations

Anchor SoilInteraction Physicalmodelling usinggeotechnical

centrifuge Largedisplacementfiniteelement

simulations

Source:Araujo,J.B.d.,R.D.MachadoandC.J.d.M.Junior,OMAE200451201.

SimulationofFloatoverOperations

Motivation: Floatover operationsincreasinglyimportantforoffshore/nearshoreintegrationofoffshoresystemsProgress: Timedomainsimulationsincludingimpactbeingdeveloped

Floatover Installation for offshore platform (Courtesy: McDermott)

Floatover Installation for Kikeh Spar (Courtesy: Technip)

Representation for impact analysis Time domain floatover