【7A文】钻井工程英文课件21.1 Well Control.ppt

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1、1SPE/IADC79880WellControlProceduresforDualGradientDrillingasComparedtoConventionalRiserDrillingFebruary21,20032003SPE/IADCDrillingConference2WellControlProceduresforDualGradientDrillingasComparedtoConventionalRiserDrillingDr.JeromeJ.SchubertDr.HansC.Juvkam-WoldTexasA&MUniversityandDr.Jongge

2、unChoeSeoulNationalUniversity21.121.1-3OverviewIntroductiontoDualGradientDrillingGoaloftheSMDWellControlTeamComparisonofWellControlforDGDandConventionalRiserDrillingConclusions21.1-4WhatisDualGradientDrilling?NoveldrillingsystemwheretheannuluspressureattheseafloorisreducedtonearseawaterHSP.

3、ResultsinapressuregradientfromtherigtotheseafloornearthatofseawaterHSP,andmudgradientfromtheseafloortothebottomofthehole21.1-5DualGradientConcept21.1-6Howisthedualgradientachieved?SeafloorpumpsandanexternalreturnlineShellDeepVisionSubSeaMudLiftDrillingInjectinghollowglassspheresneartheseafl

4、oorMaurerTechnology21.1-7GoaloftheSMDWellControlTeamDevelopWellControlProceduresfortheSMDJIPthatwereatleastassafeifnotsaferthanconventionalfloatingdrillingoperations.TheauthorsfeelthattheseproceduresareapplicableformostDGDmethods.21.1-8Howwasthegoalmet?Wehadtostudythestateoftheartinconventi

5、onaldeepwaterdrillingDeterminewhathadtobemodifiedorre-writtenfortheSMDproject.Newprocedureswerewrittenandre-writtenastheprojectprogressed.21.1-9Howwasthegoalmet?PerformriskanalysisintheformofHAZOPModifyorre-writeproceduresbasedonHAZOPIftheprocedurewasre-written,anewHAZOPhadtobeperformed21.1

6、-10Howwasthegoalmet?Finally,mostofthesewellcontrolprocedureswereprovenonaDGDtestwell.21.1-11MeasurementofKCPKCPismeasuredidenticallyforDGDandConventionalNoDSV–ratemustbegreaterthanthefreefallrateofthemudW/DSV–mustalsomeasuretheDSVopeningpressure21.1-12KickDetectionKickindicatorsDrillingbrea

7、kFlowincreasePitgainDecreaseincirculatingpressureIncreaseinpumpspeedWellflowwithpumpsoffIncreaseintorque,drag,fill21.1-13KickBeginsMLPIncreaseMLPInletPConstantDPPDecreaseFlowIncrease21.1-14WellFloww/PumpsOffNoDSVU-tubemakesthismuchmoredifficultTrendanaly