【7A文】钻井隔水管（The Drilling Riser）.ppt

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1、1TAMU-PemexOffshoreDrillingLesson5ATheDrillingRiser2Lesson5A-TheDrillingRiserRiserComponentsRiserTensioningFatigueKill/ChokeLinesInspection&MaintenanceReentry3RisersystemforafloatingdrillingrigBOPRISERJOINTSKILLANDCHOICELINESSLIPJOINTOUTERBARRELUPPERBALLJOINTSLIPJOINTI

2、NNERBARRELRISERTENSIONLOWERBALLJOINTMudlineMarineriser=drillingriser,getreturnstosurface,wellcontrol,communicationslink4IntegralMarineRiserJointsChokeandkilllinesareintegralwiththemarineriser,flangedconnections;clamp,etc5IntegralMarineRiserConnectorFlangedconnection-6b

3、oltsNOTE:ChokeandKillLinesO-ringtypeseals-inspectwhenrunning6IntegralMarineRiserConnector7MarineRiserFlexibleJointFlexiblejoint,bindingfromhightensileforces,injectlubricant,upto1,500,000lbf!8UpperSectionMarineRiserSystem.MARINERISERDIVERTERASSEMBLYRISERTENSIONINGLINEST

4、ELESCOPICJOINTKILLANDCHOKELINESFLEXIBLEJOINT9ControlvalveVentlineMudreturnsL.P.AnnularAdivertersystem.Re-directsflowfromrigfloortoblooeyline(10”+),downwind,donotshutin,erosion-10810Figure6-6.SubseaBOPStackVerticalsteelloopsusedforkill/chokelinetransitionaroundtheballjo

5、int.11TheDrillingRiserSchematicdiagramofriserwithimposedforcesMEANWATERLEVELRISERELEMENTOptimumrisertensiontominimizedamagetoriserandwear-and-tearontensioners,sag12Stressinriser,kipsAppliedtensioninriser,kipsMaximumstressMinimumstressTensioninrisermustbenottoolowandnot

6、toohigh.Setat118kips-willfluctuate100-136kips~15%MeantensionInsufficientTension(toomuchsag)13CombinedEffectofMeanStressandAlternatingStressConsider:MaxStressof40ksiAlternatingStress:10or20ksiMeanStress:?Life:?14Meanstress,ksiModifiedGoodmandiagramAlternatingstress,ksi3

7、010(20-40ksi)=>106;2020(0-40ksi)=>105cycles.IfMeanstressishigh,alt.lowYieldstrength15Vesseloffset,%ofwaterdepthMax.riserstress,ksiNeedadequatetension:Tensionedto225kipsfor6%offset:at3%,11ksi;at10%,30ksi.16Theeffectsoflosingone-sixthtensioningcapacityontherisersystemo

8、fpreviousslideMax.riserstress,ksi(196*5/6=163)Needadequatetension:Tensioningto296kipslooksthemostadvantageous.(225*5/