CentreforOffshoreResearchandEngineering(CORE)
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
0
500
1000
1500
2000
2500
3000
0 10 20 30 40 50p
com
pres
sion
(kN
)
ISO-TeqISO-AW
Test Results
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
0
20
40
60
80
100
0 5 10 15 20 25
Peak
For
ce (M
N)
Wave Height - Peak to Trough (m)
Experiments
Force Prediction
Force with Current Blockage
New Prediction in Regular Waves
12
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.
0
200
400
600
800
1000
1 0 1 2 3 4 5 6 7
f(M
Pa)
Logt (min)
Mastercurve(longitudinal tension)
Test data Fitting curve
R = R0 = 0.1f = 4 Hz
Composite riser(joint)
Fatiguemastercurve
0
10
20
30
40
50
60
70
80
90
100
0.0 0.1 0.2 0.3 0.4 0.5
anchorinclinationan
gle()
z/B
NumericalResults
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