AF_Apr2015_Fibers-Transport_RP

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1、ApplicationsForum22April2015ThismaterialisProprietarytoSchlumbergerFibersTransportinDrillingMudRodolfoPiccioliPrincipalEngineerEuropeanPDT–LondonStatementofProblem•Whendrillingawell,drillingmudispumpedinthewellto:–Removedrillingcuttingsfromthehole–Maintainpressureinthewel

2、l•Drillingmudgoesaroundinaclosedloop–Injectedatthebottomofthehole–Pushedtothetop–Cleanedandre-injectedStatementofProblem•Incarbonateformationsrockhasexistingfractures–Brazil–SaudiArabia–Malaysia–…•60%oftheworld’soiland40%oftheworld’sgasreservesareheldincarbonateformations

3、•Whenthedrillbithitsonefracture,thedrillingmuddisappearsdownthefracture–LostcirculationStatementofProblemMaintainpressureandcontinuedrillingBeabletoproducefromthatzoneinthefutureStatementofProblemCurrentapproach:•“Tune”thedrillingmud•Changethedrillingbitdiameter•Involvesa

4、lotof“art”•Timeconsuming•Costsalotofmoney!•Drillingadeepwateroffshorewellcosts$1.5Mperday•SchlumbergerideaistousefiberstotapfracturesandcontroltheflowPeopleContactedinCD-adapco•OlehBaran(Lebanon)•PetrKodl(Nuremberg)•AlexRead(Houston)Simulationapproach•ContinuousPhase–Cons

5、tantDensity(Waterproperties)–Turbulent,K-Epsilon–CoupledSolver•DiscretePhase–DEM–ParticleClumps–DragForce,SchillerNaumann–LinearCohesion–UserDefinedBodyForceSimulationApproachParticleClumps•Assumessphericalparticlesareconnectedwithabeam,whichdiameteris…•Spherediametertime

6、auserdefinedmultiplierAnalysisDetails•SchlumbergertestrigreproducedinSTAR-CCM+3D-CAD•Meshsize:~20Kcells•Time-stepsize:0.001s•VelocityInletwithfullydevelopedturbulentflow•PressureOutlet0.006m0.025m0.13mMeshingandAnalysisResultsParticleclumpsdiametermultiplier0.6MeshingandA

7、nalysisResultsParticleclumpsdiametermultiplier1.0MeshingandAnalysisResultsParticleclumpsdiametermultiplier1.4Conclusions(temporary)•Reasonwhyfiberscanblocktheflowwasfound•Linkedtofibersstructuralproperties•Flexiblefibersbendandleavethedomain•Rigidfibersareblockedbythedoma

8、inrestrictionProblem:•CustomerstatedthatmoreflexiblefiberscreateblockagesaswellMeshingandAnalysi