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10/08/2015 Improving subsurface safety valve reliability: a problem/solution approach Offshore http://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona… 1/8 Home Improving subsurface safety valve reliability: a problem/solution approach 11/01/1997 Safety reliability requires ongoing improvements Don Aldridge Baker Oil Tools In this safety valve design, the lockopen sleeve is removed and in its place is a radial punch communications system, providing a smooth ID. [16,430 bytes] Conventionally, wireline conveyed shifting tools seek a matching profile when going into the well and will often activate the lockopen sleeve and cause the downhole valve to fail. [7,678 bytes] Surface controlled, subsurface safety valves (SCSSVs) are becoming more and more common in onshore as well as offshore operations throughout the world because of their ability to protect lives, the environment, and operators' investments if the wellhead becomes damaged. The US Government now requires safety valves for most Gulf of Mexico operations, and other countries' governments are following suit. In addition to being necessary to prevent unwanted flow during catastrophic events, safety valve reliability can lead to longer completion life and curb unwanted workovers, thus reducing lifecycle costs for wells and fields. The importance of this issue was emphasized several years ago in an independent study on SCSSV safety and reliability, conducted by the Foundation for Scientific and Industrial Research (SINTEF) at the Norwegian Institute of Technology. In suggesting that purchasing departments look more toward the life cycle cost for wells rather than focusing strictly on trial purchasing cost, SINTEF addressed the importance of considering SCSSV reliability, for both safety and production regularity. At the time of the report, the reliability of all valve classes had improved significantly since the foundation's previous report. However, opportunities for further improvement existed. HOME MORE OIL PRODUCTION NEWS IMPROVING SUBSURFACE SAFETY VALVE RELIABILITY: A PROBLEM/SOLUTION APPROACH Independents galvanize marginal Tunisian field developments | Previous Article Next Article | Norway improving tax conditions for FPSO leasing HOME REGIONAL REPORTS DRILLING & COMPLETION FIELD DEVELOPMENT SUBSEA GEOSCIENCES PIPELINES PRODUCTION RIGS/VESSELS DEEPWATER BUSINESS BRIEFS

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10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 1/8HomeImprovingsubsurfacesafetyvalvereliability:aproblem/solutionapproach11/01/1997SafetyreliabilityrequiresongoingimprovementsDonAldridgeBakerOilToolsInthissafetyvalvedesign,thelockopensleeveisremovedandinitsplaceisaradialpunchcommunicationssystem,providingasmoothID.[16,430bytes]Conventionally,wirelineconveyedshiftingtoolsseekamatchingprofilewhengoingintothewellandwilloftenactivatethelockopensleeveandcausethedownholevalvetofail.[7,678bytes]Surfacecontrolled,subsurfacesafetyvalves(SCSSVs)arebecomingmoreandmorecommoninonshoreaswellasoffshoreoperationsthroughouttheworldbecauseoftheirabilitytoprotectlives,theenvironment,andoperators'investmentsifthewellheadbecomesdamaged.TheUSGovernmentnowrequiressafetyvalvesformostGulfofMexicooperations,andothercountries'governmentsarefollowingsuit.Inadditiontobeingnecessarytopreventunwantedflowduringcatastrophicevents,safetyvalvereliabilitycanleadtolongercompletionlifeandcurbunwantedworkovers,thusreducinglifecyclecostsforwellsandfields.TheimportanceofthisissuewasemphasizedseveralyearsagoinanindependentstudyonSCSSVsafetyandreliability,conductedbytheFoundationforScientificandIndustrialResearch(SINTEF)attheNorwegianInstituteofTechnology.Insuggestingthatpurchasingdepartmentslookmoretowardthelifecyclecostforwellsratherthanfocusingstrictlyontrialpurchasingcost,SINTEFaddressedtheimportanceofconsideringSCSSVreliability,forbothsafetyandproductionregularity.Atthetimeofthereport,thereliabilityofallvalveclasseshadimprovedsignificantlysincethefoundation'spreviousreport.However,opportunitiesforfurtherimprovementexisted.HOME MOREOILPRODUCTIONNEWS IMPROVINGSUBSURFACESAFETYVALVERELIABILITY:APROBLEM/SOLUTIONAPPROACHIndependentsgalvanizemarginalTunisianfielddevelopments|PreviousArticleNextArticle|NorwayimprovingtaxconditionsforFPSOleasingHOMEREGIONALREPORTSDRILLING&COMPLETIONFIELDDEVELOPMENTSUBSEAGEOSCIENCESPIPELINESPRODUCTIONRIGS/VESSELSDEEPWATERBUSINESSBRIEFS10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 2/8WhyvalvesfailWhilesomedownholeequipmentremainsstaticthroughoutthelifeofthecompletion,safetyvalvesareroutinelyopened,closed,andtestedtoensurethattheyarereadyandworkingproperlyintheeventofacatastrophe.However,thevalvessometimesfailduringnormalproductionoperationsduetoelastomerfailure,failureofpressfitplugs,orprematureactivationoflockoutfeatures.Ifavalvefailsduringoneoftheseprocedures,itgenerallynecessitatesanunscheduledworkoverwhichinterruptsproductionand,particularlyindeepwaters,canbeveryexpensive.Or,itmayrequiretheinstallationofaninsertsafetyvalvewithrestrictiveinternaldiameters.Failureofthecontrolfluidcommunicationsystemhasbeenshowntobetheprimarycauseofsafetyvalvefailures.Infact,theSINTEFstudyrevealedthatmorethan25%offailuresinconventional,normallyclosed,tubingretrievablesubsurfacesafetyvalveswerelinkeddirectlytoleakagebetweenthehydrauliccontrollinechamberandthetubingwellbore,throughthewirelineinsertvalvecommunicationfeature.Inmostfailures,theleakagewascausedbyprematureorinadvertentactivationofthelockopensleeveintheIDofthevalve.Anewsafetyvalvedesignedaroundapatentedcontrolfluidcommunicationfeatureprovidesanuninterruptedcontrolfluidpathtothepistonandpreventsaccidentalactivationoflockopensleeves.FailureanalysisIndependenttestingandfieldexperienceconfirmthataccidentalactivationofsubsurfacesafetyvalvesislinkedtolinearmotionsleevedesignsthatareintegraltomanysafetyvalves.WhenroutineinterventionmethodsareperformedsuchasusingashiftingtooltooperateaslidingsleeveandbringanewzoneonproductionthewirelineorcoiledtubingthatconveysthetoolmustpassthroughtheIDofthevalve.Unfortunately,theprofileofthevalve'slinearmotionlockopensleeveisverysimilartothatofothertubingmountedaccessories,suchasnipplesandslidingsleeves.Thewirelineorcoiledtubingconveyedtoolsautomaticallyseekamatchingprofilewhentheyaregoinginthewell.Thus,iftheyhitonanyoftheshouldersorprofilesinthelockopensleeve,theywilllikelyactivateit,causingthecontrolfluidtoleakandthevalvetofail.Thiscallsforexpensive,correctivewellreentryprocedures.EliminatingvulnerabilityThepreviouslydescribed,newlydesignedtubingretrievablesafetyvalveremovesthelockopensleevefromthevalveandsubstituteslinearlockopenmotionwithapatented,radialpunchcommunicationsystem.ThesedesignchangesleavethesafetyvalvewithasmoothID,freeofsleevesorotherdevicesthatmovelinearlyandcanhangupwirelineorcoiledtubingconveyedtools.Controlfluidcommunicationtothelockopensleeveisachievedonlybyradialmotionofaonetrip,jardownwirelinetool.Asaresult,thereisnopossibilityforothertoolstoaccidentallyactivatethelockopenfeaturewhilepassingthroughtheIDofthevalve.Intheeventthatifbecomesnecessarytopuncturethevalve,onlythecylindersubispunctured.Therestofthevalveremainsintact.Thenewradialpunchdesignhascompiledafieldhistoryandhasdisplayedalevelofdependabilitythathasgainedoperatoracceptance.After2300installations,therehavebeennovalvefailuresduetoprematurelockopen.10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 3/8PerformanceimproversInadditiontoradialpunchcommunication,othersafelyvalvedesignfeaturecanfurtherenhanceperformanceintegrity.Outerhousingthreadseals:Thesealsusedintheouterhousingsofsafetyvalvesarecriticaltosafetysystemreliability.Failureinthesesealscanleadtoatubingtoannulusleak,andpossiblyaworkover.Metaltometalhousingconnectionscaneliminateexplosivedecompression,chemicalandthermaldegradation,andotherproblemsassociatedwithelastomericsealingsystems.Atwostepthreaddesigncanfurtherextendthevalve'sservicelifebydistributingloadingonthethreadmoreefficiently,andprovidingsignificantlygreaterstrengthforagivensectionthicknessthanasinglestepdesign.Closuremechanism:Astrongclosuremechanismcanprotectthevalveseatfromstressinduceddamagetoensurecontinuouslyreliablesealing.Athick,wedgeshapedflapperclosuremechanismhasbeenproventobeparticularlyeffectiveforthispurpose.Thewedgedesignmovesthefirstpointofcontactwiththeflowtubeawayfromthehingepintominimizeloadingonthehingeandflapperpin.Aspecialhingedesignvitallyeliminatesflapperpinbending.Selfequalizingmechanism:Anintegralequalizingmechanismeliminatestheneedtoequalizedifferentialpressureacrosstheflapper.Byventingshutinpressurefrombelowthesafetyvalvetothetubingabovetheflapper,avalvecanbeequalizedandcanreturnthewelltoproductionquicker,safer,andmoreefficientlythanwhenpumpsandfluidsmustbeused.Particularlyeffectiveisathroughtheflapper,metaltometalselfequalizingsystemthateliminatesvalvefailurecausedbyerosionproblemsorbuildupoffluiddebrisinthevalveannulus.SlamtestingGasslamtestsareanexcellentindicationofthereliabilityofasubsurfacesafetyvalve.Toeffectivelyevaluatethevalve,thesetestsmustduplicateorexceedreallifedownholeconditionspresentwhenthewellisflowing,thecontrollineisbledoff,andthesafetyvalvecloseswiththeflowagainsttheflapper.Thefollowinglistrepresentssuggestedminimumrequirements:Twentyslams,ofwhich15are:200ft/sec(41MMscfd)for23/8in.valves200ft/sec(58.5MMscfd)for27/8in.valves200ft/sec(102.7MMscfd)for3l/2in.valves150ft/sec(146.0MMscfd)for4l/2in.valves125ft/sec(120.7MMscfd)for51/2in.valvesand80ft/sec(146MMscfd)for7in.valves.Theseflowratesareashighas10timesthoserequiredbytheAPI.Continuedtechnologicaladvancements,suchasthosedescribedhere,whichcansubstantiallyimprovesafetyvalvereliability,willbekeytomeetingthecombinedeconomic,environmental,andhumansafetystandardsthatwilldrive21stCenturyenergydevelopmentandutilization.References"ReliabilityofSurfaceControlledSubsurfaceSafelyValvesPhaseIV",FoundationforScientificandIndustrialResearch,NorwegianInstituteofTechnology,ReportNo.STF75R91038,1992.Copyright1997Oil&GasJournal.AllRightsReserved.10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 4/8SPSOverlayprovidessideimpactprotectiononthreeFPSOsDec17,2014SPSOverlayhasprovidedsideimpactprotectionforthreeFPSOs.TheworkwascarriedoutatEnseadadoParaguauSAShipyards(EEP)inBrazilandattheCOSCO(Dalian)ShipyardinChina.EnicompletesproductiontestonwelloffshoreCongoDec15,2014EnihascompletedtheproductiontestontheMinsalaMarine1NFW,locatedintheMarineXIIblockoffshoreCongo.BlueOceansetsdeepwatersubseainterventionrecordDec15,2014BlueOceanTechnologieshassetanotherrecordfordeepwatersubseainterventions.BlueOceansInterchangeableriserlessinterventionsystem(IRIS)recentlyintervenedonadeepwaterproductionwe...LiuhuagasfieldgoesonstreamoffshoreChinaDec15,2014CNOOChasstartedproductionfromtheLiuhua342gasfieldintheeasternSouthChinaSea,wherewaterdepthsrangefrom8501,250m(2,7894,101ft).NorthSeaHuntingtonstilloutofactionDec15,2014NorecosaysproductionfromtheE.ONRuhrgasoperatedHuntingtonfieldintheUKcentralNorthSearemainsshutin,duetoanincidentthataroseduringrestartoftheCATSriserplatform.MoreOffshoreIssueArticlesOffshoreArticlesArchivesRELATEDARTICLESIndependentsgalvanizemarginalTunisianfielddevelopments|PreviousArticleNextArticle|NorwayimprovingtaxconditionsforFPSOleasing10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 5/8OffshorephotoofthedayMexicorevisesrulesforsecondphaseofRoundOneauctionAug7,2015MexicosoilregulatorhasunveiledmoreattractiverulesforthesecondphaseofthecountrysRoundOneoilauction,accordingtoareportintheLatinAmericanHeraldTribune.HorizonGeosciencesaddsnewvesselAug7,2015HorizonGeoscienceshasaddedtheKommandorStuartvesseltoitsfleet.BechtelreceivesFEEDcontractforPortDelfinFLNGvesselAug7,2015DelfinLNGhaschosenBechteltoprovidefrontendengineeringanddesignforwhatwouldbethefirstUSbasedFLNGvesseltogoontheproposeddeepwaterport50mi(80km)offshoreCameronParish,Louisiana.Phase1MexicoSPANfasttrackdataavailablefromIONGeophysicalAug7,2015IONGeophysicalhasavailablethefasttrackprestacktimemigrateddatafromPhase1ofitsMexicoSPANprogram.OFFSHORETOPICSDrilling&CompletionFieldDevelopmentSubseaGeosciencesPipelinesProductionRigs/VesselsDeepwaterBusinessBriefsREGIONALREPORTSTRENDINGNEWS10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 6/8AfricaAsiaAustralia&NewZealandCanadaLatinAmericaMiddleEastNorthSea&EuropeRussiaUS&GulfofMexicoOffshoreTop5Projects2013Topsides,Platforms&Hulls2014AdvisoryBoardTopsides,Platforms&HullsOpeningPlenarySessionOffshoreDigitalMagazineLookInsideCurrentIssueLATESTEVENTSLIDESHOWSUPCOMINGEVENTSOffshoreWestAfricaConference&Exhibition10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 7/8 UTILITYHomeAboutUsAdvertiseContactUsSubscribeEventsOTCRSSCompanyNewsSpecialReportsTOPICSRegionalReportsDrilling&CompletionFieldDevelopmentSubseaGeosciencesPipelinesProductionRigs/VesselsDeepwaterBusinessBriefsCopyri ght 20072015 PennWel l Corporat i on, Tul sa, OK. Al l Ri ght s Reserved. Terms and Condi t i ons | Pri vacyPol i cyMOREEVENTShttp://www.offshorewestafrica.com/index.htmlTue,Jan20,2015Thu,Jan22,2015OffshoreMiddleEastConference&Exhibitionhttp://www.offshoremiddleeast.com/index.htmlMon,Jan26,2015Wed,Jan28,2015Topsides,Platforms&Hullshttp://www.topsidesevent.com/index.htmlTue,Feb3,2015Thu,Feb5,2015OIL&GASJOBSSearchMoreJobListings>>10/08/2015 Improvingsubsurfacesafetyvalvereliability:aproblem/solutionapproachOffshorehttp://www.offshoremag.com/articles/print/volume57/issue11/news/generalinterest/improvingsubsurfacesafetyvalvereliabilityaproblemsolutiona 8/8


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