..1.GeneralShanghaiShenkaiPetroleum&ChemicalEquipmentCo.,Ltd(originalShanghaiNo.1PetroleumMachineWorks)hasalonghistoryandstrongtechnicalstrengthtospecializeinmanufacturingpetroleumequipmentandtools.Ourcompanyownsthecompleteinspection,measureandtestequipment.Wehavebeenawarded“ExcellentScientificandTechnologicalAchievementPrizeForPetroleumEquipment",“SecondPrizeofScienceandTechnicalProgressPrizeforOffshorePetroleumEquipment"and“FirstPrizeofScienceandTechnicalProgressPrizeforTechnicalStudyofBOPControlSystem"etcbyoriginalStateEconomyCommission,originalMinistryofMachineryIndustryandoriginalChinaPetroleum&GasCorporation.Atpresent,theBOPstacks,whicharemanufacturedbyourcompany,haveformedaproductlinetosatisfytheneedoflandandoffshoredrillingplatforms.ShanghaiShenkaiPetroleum&ChemicalEquipmentCo.,Ltd(originalShanghaiNo.1PetroleumMachineWorks)hasalonghistoryandstrongtechnicalstrengthtospecializeinmanufacturingpetroleumequipmentandtools.Ourcompanyownsthecompleteinspection,measureandtestequipment.Wehavebeenawarded“ExcellentScientificandTechnologicalAchievementPrizeForPetroleumEquipment",“SecondPrizeofScienceandTechnicalProgressPrizeforOffshorePetroleumEquipment"and“FirstPrizeofScienceandTechnicalProgressPrizeforTechnicalStudyofBOPControlSystem"etcbyoriginalStateEconomyCommission,originalMinistryofMachineryIndustryandoriginalChinaPetroleum&GasCorporation.Atpresent,theBOPstacks,whicharemanufacturedbyourcompany,haveformedaproductlinetosatisfytheneedoflandandoffshoredrillingplatforms.Ourcompanyhascompletequalitymanagementsystem.ThedesignandmanufactureofproductconformtoAPISpec16Aandnationalstandard.WehaveobtaineddualcertificatequalitysystemcertificationofAPISpecQ1andISO9001aswellasthelicenseforusingAPImonogram.1．1TypeDescriptionThetypeofAnnularBOPwhichismanufacturedbyourcompanyconsistsoffivecapitallettersornumbers(Somecanbeomitted.)Asshownbelow:FHFHcodeofbottomconnectionflange(whenthesameasratedworkingpressure,itcanbeomitted,unit:MPa)codeofbottomconnectionflange(whenthesameasratedworkingpressure,itcanbeomitted,unit:MPa)codeofrateworkingpressure(unit:MPa)codeofborecodeofrateworkingpressure(unit:MPa)codeofborecodeofpackerform:taperedpacker—Z,codeofpackerform:taperedpacker—Z,sphericalpacker—omitted球形膠芯—省略CodeofAnnularBOPCodeofAnnularBOP“FH35-35/70“FH35-35/70”showsthattheAnnularBOPwithasphericalpacker,theboreisφ346.1mm(135/8″),theratedworkingpressureis35MPa(5000Psi),theratedworkingpressureofbottomconnectionflangeis70MPa(10000Psi).“FHZ54-14”showsthattheAnnularBOPwithataperedpacker,theboreisφ539.8mm(211/4″),theratedworkingpressureis14MPa(2000Psi),theratedworkingpressureofbottomconnectionflangeis14MPa(2000Psi).1．2ApplicationAnnularBOPisanimportantpartofwell-controlequipments.Itmainlyappliestocontrolwellheadpressureduringdrillingworkoveroperationsandformationtestingetctopreventwellblowouteffectivelyandrealizesafeconstruction.AnnularBOPshallbeequippedwithhydrauliccontrolsystem.ItisusuallyusedwithramBOPandalsoindependently.Itcanbeusedforfollowingoperation:AnnularBOPisanimportantpartofwell-controlequipments.Itmainlyappliestocontrolwellheadpressureduringdrillingworkoveroperationsandformationtestingetctopreventwellblowouteffectivelyandrealizesafeconstruction.AnnularBOPshallbeequippedwithhydrauliccontrolsystem.ItisusuallyusedwithramBOPandalsoindependently.Itcanbeusedforfollowingoperation:Underthecontrolofthehydrauliccontrolsystemwhichisequippedwithadepressuringpressureregulatingvalveoracushionaccumulator,itcanforcestrippingwith18°tooljoint.Whenthewellblowoutandoverflowhappensduringdrilling,coringorwelllogging,itcansealtheannularspacesbetweenKelly,coringtools,cable,wirelineandwellbore.Whenthereisnodrillingtoolinhole,itcansealthewellheadcompletely.Itcansealanysizeofannularspacewithakindofrubberifthereisadrillingtool,Underthecontrolofthehydrauliccontrolsystemwhichisequippedwithadepressuringpressureregulatingvalveoracushionaccumulator,itcanforcestrippingwith18°tooljoint.Whenthewellblowoutandoverflowhappensduringdrilling,coringorwelllogging,itcansealtheannularspacesbetweenKelly,coringtools,cable,wirelineandwellbore.Whenthereisnodrillingtoolinhole,itcansealthewellheadcompletely.Itcansealanysizeofannularspacewithakindofrubberifthereisadrillingtool,tubingorcasinginhole.Ourcompanyhastwokindsofpackers:sphericalandtapered.Thebonnetofsphericalpackerandshellisjointwithflangeandwedge.Thebonnetoftaperedpackerandshellisjointwithjaw.Ourcompanyhastwokindsofpackers:sphericalandtapered.Thebonnetofsphericalpackerandshellisjointwithflangeandwedge.Thebonnetoftaperedpackerandshellisjointwithjaw.〈seetable1、fig1、fig2、fig3〉Betweenbonnetandshellisflangeconnection(fig1)Betweenbonnetandshellisflangeconnection(fig1)≤35MPa≥70MPasphericalPackertypeAnnularBOP≥70MPasphericalPackertypeAnnularBOPBetweenbonnetandshelliswedgeconnection(fig2)Betweenbonnetandshelliswedgeconnection(fig2)Betweenbonnetandshellisjawconnection(fig3)Betweenbonnetandshellisjawconnection(fig3)tapered1Bonnet21Bonnet2Sphericalpacker3Adapterring4Piston5Shell6SealingcomponentFigure1FH35-35/70AnnularBOP(Betweenbonnetandshellisflangeconnection)1Bonnet21Bonnet2Clampring3Wedge4Sphericalpacker5Mud-guardring6Sealingcomponent7Piston8Shell、Figure2FH35-70/105AnnularBOP(Betweenbonnetandshelliswedgeconnection)1Bonnet21Bonnet2Wearplate3Taperedpacker4Jaw5Sealingcomponent6Piston7Outsidesleeve8Insidesleeve9ShellFigure3FH54-14AnnularBOP(Betweenbonnetandshellisjawconnection)Table1SpecificationandTechnicalDataofAnnularBOPModelFH18-35FH28－35FH28-35/70Boremm(in)179.4(71/16)279.4(11)RatedWorkingPressureMPa(Psi)35(5000)HydraulicControlpressureMPa(Psi)≤10.5(1500)Hydro-cylinderOpeningChamberVolume(L)12.85858Hydro-cylinderClosingChamberVolume(L)18.87272ConnectionTypebetweenBonnetandShellFlangeFlangeFlangeTypeofPackingUnitSphericalSphericalSphericalTopConnectionTypeTopStuddedBoltM36×3M48×3M48×3GasketR46R54R54BottomConnectionTypeBottomFlangeBoltM36×3M48×3M45×3GasketR46R54BX158SpecificationofHydraulicControlConnectionZ1"×2NetWeightkg157243004423CenterofGravity(Thecenterofbottomflangeisoriginalpoint)338462468OutsideDimensionMmA73711381138H79010811096PackagingDimension(length×width×height)mm1380×940×11951500×1310×16401500×1310×1640Grosskg175545604683Figure4OutlinedrawingofAnnularBOPwithsphericalpackerContinualtable1SpecificationandTechnicalDataofAnnularBOPModelFH35-35FH35-35/70FH35-70/105FHZ54-14Boremm(in)346.1(135/8)539.8(211/4)RatedWorkingPressureMPa(Psi)35(5000)70(10000)14（2000）HydraulicControlpressureMPa(Psi)≤10.5Hydro-cylinderOpeningChamberVolume(L)71.371.312472Hydro-cylinderClosingChamberVolume(L)93.593.5152118ConnectionTypebetweenBonnetandShellFlangeFlangeWedgeJawTypeofPackingUnitSphericalSphericalSphericalTaperedTopConnectionTypeTopStuddedBoltM42×3M42×3M48×3M42×3GasketBX160BX160BX159R73BottomConnectionTypeBottomFlangeBoltM42×3M48×3M58×3M42×3GasketBX160BX159BX159R73SpecificationofHydraulicControlConnectionZ1"(2")×4Z1"(11/2")×2NetWeightkg6843147606780CenterofGravity(thecenterofbottomflangeisoriginalpoint)525910744OutsideDimensionMmA1270127016401516H1160122716341337PackagingDimension（length×width×height）mm1620×1380×17002200×2100×2310Grosskg7138Notice:Notice:ThesizeoftopandbottomflangeconformstoAPISpec16A.Figure5OutlinedrawingofAnnularBOPwithtaperedpacker3．WorkingPrincipleandPrimaryStructureFeaturesofAnnularBOPwithSphericalPackers3.1WorkingPrincipleFortheFortheAnnularBOPwith35MParatedworkingpressureorless,theconnectionbetweenthebonnetandshellisflangedconnection.Itconsistsofshell,bonnet,piston,packer,adapterringandsomeseals,etc.(Figure1)FortheAnnularBOPwith70MParatedworkingpressureormore,theconnectionbetweenthebonnetandshelliswedgedconnection.Itconsistsofshell,bonnet,piston,packer,mud-guardring,wedge,clampringandsomesealingcomponents,etc.(Figure2)Whenwellblowouthappensandneedstoshutinthewell,thehigh-pressureoilofhydrauliccontroldeviceispumpedintotheclosingchamberoftheBOPbelowthepiston.Asthepistonrises,itpushesthepackingunitup.Becauseofthelimitationofhemisphericalbonnet,thepackingunitmovesupwardalongthebonnetsphericalsurfacetothecenterofwellheadduringtherising.Untiltherubberbetweenthesupportingribsiscrushedtoenclaspthedrillingtoolsorsealtheopenholecompletely,andthensealthewell.WhenthehydraulicfluidispumpedintotheopeningchamberoftheBOPabovethepiston.Asthepistoncomesdown,thecompressiveforceactiononthesphericalsurfaceofpackerisclosedup,thepackingunitreturnstoitsoriginalpositionbyitselasticitytoopenthewell.3.2.3FortheAnnularBOPwith35MParatedworkingpressureorless,theflangedstud(seefigure1)andcapnutisusedfortheconnectionbetweenthebonnetandshelltopreventtherustingbetweenstudandnut.3.2.2The“Z”shapecross-sectionofpistonhasthefeaturesofshortstrokeandlowheight.TherearetwowearringsbetweenthepistonO.D.andshell,alsoawearingringbetweenthepistonI.D.andshelltoavoidthedirectcontactbetweenthepistonandshell3.2.3FortheAnnularBOPwith35MParatedworkingpressureorless,theflangedstud(seefigure1)andcapnutisusedfortheconnectionbetweenthebonnetandshelltopreventtherustingbetweenstudandnut.3.2.2The“Z”shapecross-sectionofpistonhasthefeaturesofshortstrokeandlowheight.TherearetwowearringsbetweenthepistonO.D.andshell,alsoawearingringbetweenthepistonI.D.andshelltoavoidthedirectcontactbetweenthepistonandshellduringmovementofpistonforprotectingshellandpiston.Replacethewearingringifitisworn.3.2.1Themajorparts,suchasbonnet,shell,piston,andadapterringadoptexcellentalloysteel.ThesematerialsconformtothespecificationofNACEMR-01-75andapplytotheworkingconditionofacidmedium.Ithasbeenheat-treatedspecially.ThehydrostaticprooftestisdoneaccordingtothespecificationofAPISpec16Atoensurethesafetyandreliabilityofusingundertheworkingpressure.3.2.5FortheAnnularBOPwith70MParatedworkingpressureormore,12wedges(example:typeFH35-703.2.5FortheAnnularBOPwith70MParatedworkingpressureormore,12wedges(example:typeFH35-70/105AnnularBOP,seefigure2)areusedfortheconnectionbetweenthebonnetandshell.Theyhavebigconnectionstrength,andtheshellisunderuniformstress.Itiseasytoassembleanddisassemble.3.2.4Thelip-sealingringisusedatthreedynamicsealpositioninAnnularBOP.Theyhaveselfsealingperformancetoreducethewearofsealingring.Sothattheycanreliablesealtoavoidleak.(seefigure1,figure2)PistonO.D.:onpistonO.D.tocontainopeningandclosingchamber.PistonI.D.:onshelltocontainwellborepressureandclosingchamber.Adapterring:onadapterringtocontainwellborepressureandopeningchamber.3.2.6Thebonnetissemisphere,nostressconcentration.3.2.6Thebonnetissemisphere,nostressconcentration.3.3SealingPrinciple&StructureandFeatureofSphericalPacker3.3.2Funneleffect：3.3.2Funneleffect：Fromthefreestatetothecompressedstate,eachcross-sectiondiameter’sreductionoftheannualpackerisdifferent.Thereductionatthetopisbigandatthebottomissmall.Therefore,rubbercompressesfirmlyagainstthesteelsegmentatthetopofthepacker,butrubberatthebottomisonlyslightlycompressed.Thisformsa“funnelelement”thatnotonlyimprovesthesealingcharacteristicsbutalsomakesiteasyforatooljointtoenterthepacker.Whenstrippingin,wellborepressurecompressestherubberportionofpackertoavoidtensilestresstoprolongtheservicelifeofrubber.3.3.1Thesealingprincipleofpacker:theAnnularBOPissealedintwostages.Thestageone:thepistonpushesthepackingunitupwithhydraulicpressureandcauseitmovesupwardalongthesphericalsurfacetothecenterofwellhead,andthenthesupportingribsclosetogethertocrushedtherubbertothecenterofwellheadtoformtheinitialsealing.Thestagetwo:ifthereiswellpressureinhole,thewellborepressureactionontheupperannularsurfaceofpiston’sinnerchamberpushesthepistonupfurthercausethesealingtightertoformreliablesealing.Itiscalledassistingclosingofwellborepressure.圖6球形膠芯外形圖3.3.33.3.3Extrudingandtearofthepackerarelimited:whenaholeisclosed,thewellborepressureforcesthecenterrubberofpackertoextrude,butthetopplateofsupportingrib’ssphericalsurfacecanresistthat,sotherubberinacompressedstatetosupportthelargepressuresothatitwillnotbetorn. (Figure6)Outlinedrawing(Figure6)Outlinedrawingofsphericalpacker3.3.4Largereserveofrubber：Thiskindofsphericalpackerhasmoresparerubberforreplenishmentafterdrillingtoolsaretornbecauseofforcedstripping,andthereisnoneedtoreplacetherubberduringthestripping.Itisespeciallysuitableforthesituationwheredrillingtoolrubsagainstrubberfrequently.3.3.53.3.5Thepackerissemisphere(Figure6)：Itisvulcanizedby12~14radiatebowsupportingribsandrubber.Theribsaremadeofalloysteel.4.WorkingPrincipleandPrimaryStructureFeaturesofAnnularBOPwithTaperedPackers(Figure3)4.1WorkingPrinciple:.1TheconnectionbetweenthebonnetandshelloftheAnnularBOPwithtaperedpackerisjawconnection.Itiscomposedofshell,bonnet,piston,packer,outsidesleeve,insidesleeve,wearplateandsomecomponents,etc.(Figure3).2Whenwellblowouthappensandneedstoshutinthewell,thehydraulicfluidispumpedintotheclosingchamberoftheBOPbelowthepiston.Asthepistonrises,itpushesthepackingunitup.Becauseofthelimitationofwearplate,thepackingunitmovesupwardalongthepistonconicalsurfaceandwearplatetothecenterofwellheadduringtherisinguntiltherubberbetweenthesupportingribsiscrushedtoenclaspthedrillingtoolsorsealthewellheadcompletely,andthensealthewell.WhenthehydraulicfluidispumpedintotheopeningchamberoftheBOPabovethepiston.Asthepistoncomesdown,thecompressiveforceactiononthewearplateisclosedup,thepackingunitreturnstoitsoriginalpositionbyitselasticitytoopenthewell.4.2StructureFeature4.2.1Themajorpa4.2.1Themajorparts,suchasbonnet,shell,piston,andoutsidesleeveadoptexcellentalloysteel.ThesematerialsconformtothespecificationofNACEMR-01-75andapplytotheworkingconditionofacidmedium.Ithasbeenheat-treatedspecially.ThehydrostaticprooftestisdoneaccordingtothespecificationofAPISpec16Atoensuresthesafetyandreliabilityofusingundertheworkingpressure.4.2.2Thelip-sealingringisusedatthreedynamicsealpositionsinAnnularBOP.Theyhavetheperformanceofselfsealingtoreducethewearofsealingring.Sothattheycanreliablysealtoavoidleak.(Figure3)PistonO.D.:onpistonO.D.tocontainopeningandclosingchamber.PistonI.D.:onshelltocontainwellborepressureandclosingchamber.Bonnet:onbonnettocontainwellborepressureandopeningchamber.4.2.44.2.420jawsareusedfortheconnectionbetweenthebonnetandshell(Figure3).Theyhavereliableconnectionandtheshellisunderuniformstress.Itiseasytodisassembleandassemble.Therearetwo“O”sealingringsoneachofthejawscrewtopreventtherustingbetweenjawandbonnet..3Thereisatestholeofpistononthebonnet,contrastthepistonstrokefromtimetotimetopredictthelifeofpacker.4.2.5Theinnerchamberonthetopofpistonistaper,contactwithconicalsurfacepackerdirectly.Duetothedegreeofthetaperissmall,thethrustofpistonforclosingisalsoandO.D.islessthanothertypeofannularBOP.4.2.5Theinnerchamberonthetopofpistonistaper,contactwithconicalsurfacepackerdirectly.Duetothedegreeofthetaperissmall,thethrustofpistonforclosingisalsoandO.D.islessthanothertypeofannularBOP..6Adismountablewearplatisequippedonthefrictionsurfacewhichthetopofbonnet’sinnerchambercontactwiththesupportingribsofpacker(Figure3)toprotectbonnetandeasytoreplace.4.3SealingPrinciple&StructureFeatureofTaperedPacker.1TheSealingprincipleofpacker:theAnnularBOPissealedintwostages.Thestageone:thepistonpushesthepackingunitupwithhydraulicpressureandcauseitmovesupwardalongthepistonconicalsurfaceandwearplatetothecenterofwellhead,andthenthesupportingribsclosetogethertocrushedtherubbertothecenterofwellheadtoformtheinitialsealing.Thestagetwo:ifthereiswellpressureinhole,thewellborepressureactionontheupperannularsurfaceofpiston’sinnerchamberpushesthepistonupfurthercausethesealingtightertoenhancethesealingperformanceofpacker.Itiscalledassistingclosingofwellborepressure.4.3.3Largereserveofrubber4.3.3Largereserveofrubber：Thepackerhasalargestoragecapacity.Rubbersamongpacker’ssupportingribsmaybecrushedtothewellheadandsealed.Thevolumeofpackerismuchlargerthanthespacewhichneedstoclosein.Therefore,theycancloseindifferentshapeandsizeofdrillingtools,alsocanclosethewellheadfully.Ifhydrauliccontrolpressureiscontrolledbyadepressuringpressureregulatingvalveoracushionaccumulator,thepackercanforcestrippingandallowpassing18°tooljoint.Becauseofthelargereserveofrubber,ifthepackerisnotdamagedseriously,itstillcansealanditslifecanbetested.DuringtheannularBOP’sworkingprocess,thepackerisdamagedcontinually,soitneedstofillthroughincreasingpistonstrokeandcrushingreserverubber.Whenthepistonstrokeisthemaximum(pistonmovestotop),ortheupperandlowersurfaceofthepacker’ssupportingribscloseupseparately,itshowsthatthereserverubberofpackerrunout.Evenifincreasingthehydrauliccontrolpressure,thepackercan’tsealreliably.Sothelifeofthepackercanbepredictedbymeasuringthepistonstroke.4.3.2Theoutsideofpackeristaper.Theanglebetweenthebusoftheconicalsurfaceandtheaxisofthepackeris25°.Thepackerisvulcanizedby22supportingribsandrubber.Supportingridisequippedlikeradial.(Figure7).Figure7Outlinedrawingoftaperedpacker5.2Pressuretestafterinstallatio5.2Pressuretestafterinstallation：AnnularBOPshouldbefixedfirmlyafterinstallationandbeperformedthehydrostaticprooftestedwiththewholesetofwellheaddevicestoinspectthereliabilityofsealingcharacteristicsandallconnections.OnlyqualifiedBOPcanbeused.Onthedriller’sstationandremotecontrolconsole,theBOPshouldbecheckedbyclosingandopeningtwicetoinspectthecorrespondencebetweenopening&closingandpracticaloperationandcorrectnessofconnectionofpipelines.Airshouldberemovedfromtheoilduct.TheBOPshouldbeintheopenpositionwhennormaldrilling.5.1Installation5.1Installation：AnnularBOPcannotbetransportedtowellsitetillsealingpressuretest,whichrisespressuretoratedworkingpressure.InstallationshouldbeaccordingtotheBOP’scombinedformoftherequirementofwellcontrol.ThejointsofwelltubingandramBOPshouldbeinthesamedirection.6.OperationandNotice6.1Normally,thecontrolpressure(closingpressure)ofBOPwithindividualdepressingpressureregulatingvalveshouldbelessthanorequalto10.6.1Normally,thecontrolpressure(closingpressure)ofBOPwithindividualdepressingpressureregulatingvalveshouldbelessthanorequalto10.5MPaandhascertainproportionwithwellborepressureandthedimensionofdrillingtool.Ifthediameterofdrillingtoolislargeorthewellborepressureislow,itshouldbeloweredcorrespondinglytoextendthepackerservicelife.6.3Afterreachingthetargetstratum,theBOPshouldbecheckedbyclosingandopeningwithdrillingtoolbutnowellpressureinwellonceeverydaytoavoidthepackerblocking.6.2Whenwellblowouthappens,theAnnularBOPcanbeusedtoshutinthewellfirst,butitcannotbeusedforalongtime.First,itcandamagetherubberuntimely.Second,ithasnolockingdevice.Ifthereisnospecialsituation,itcannotbeusedtoshutintheopen-hole.6.4WhenusingtheAnnularBOPtostrippinginwithoutwellkill,mustuse18°6.4WhenusingtheAnnularBOPtostrippinginwithoutwellkill,mustuse18°tooljoint.Onthehydrauliccontrolclosinglines,inadditiontotheindividualdepressuringregulatingvalve,ifthereisaaccumulator,thehydraulicpercussionintheclosingchambercanbeobtainedacushioningeffecttoextendthepacker’sservicelife.Duringforcedstripping,onthepremiseofsealing,hydraulicpressureshouldbeadjustedaslowaspossibleandthespeedofstrippingshouldbecontrolledstrictly.Especiallythedrillpipesshouldbeputupanddownslowlythroughthejoints.6.5AfteropeningtheBOP,itshouldbecheckediftheBOPisopenedfullytopreventthepackertobescratched.6.66.6ItisnotallowedtoreleasethewellborepressurebyopeningBOP. 6.76.7WhentheBOPisinclosingposition,itisallowedtomovedrillingtoolupanddownbutnottoturnit.6.86.8Notice:keepthehydraulicfluidclean.7.Maintenance7.1NoticeAfterusingthewell,disassemblingthehydrauliclinesconnectingwithBOP,blockingholeswithplugs,cleantheBOPfromoutsidetoinside,andinspectallsealsandtheircontactsurface.Thengreasetheboltholes,thegasket-grooves,theinnersurfaceofbonnetandthesupportingsurfaceofpistontoavoidrust.Afterusingthewell,disassemblingthehydrauliclinesconnectingwithBOP,blockingholeswithplugs,cleantheBOPfromoutsidetoinside,andinspectallsealsandtheircontactsurface.Thengreasetheboltholes,thegasket-grooves,theinnersurfaceofbonnetandthesupportingsurfaceofpistontoavoidrust.Afterdisassembling,theconnectionssuchasgaskets,studs,nutsandspecialtoolsshouldbeAfterdisassembling,theconnectionssuchasgaskets,studs,nutsandspecialtoolsshouldbegatheredandencasedinordertopreventtheyfromlosing.Checktheallscrewsfromtimetotime,Checktheallscrewsfromtimetotime,tightenthemintimeiftheyareloose.Keepthehydraulicoilcleanandpreventdirtfromenteringthecylindertoavoiddamagingthecylinderandpiston.Keepthehydraulicoilcleanandpreventdirtfromenteringthecylindertoavoiddamagingthecylinderandpiston.Allrubberpartsshouldbestoredasfollowing:#Allrubberpartsshouldbestoredasfollowing:#Numberingthemaccordingtothetimeofwarehousingandnew&old,alwaysusingtheoldestfirst.#Storingrubbersinadarkanddryroominarelaxationalposition.Donotstorethemoutdoors.Theserubberscannotbebentorcompressed.Itisbettertolaythemflatinawoodencase.O-ringisnotallowedtohungonthewoodpile.#Storerubbersawayfromcorrosivemedium,electricmotorsandhigh-voltageequipmenttoavoidpackerproducingozonetocorroderubbers.7.2ReplacingofPacker.1Packeristhekeypartwhichplaystheroleofsealingwell.Onceitisdamagedseriously,itcannotsealwell.Replacingthepackerintimeifitisdamagedseriously.Thepackershouldbereplacedinsupportbase..2Ifthepackerisreplacedinwellsite,itshouldbeoperatedasfollowing:1.Removetheconnectionbetweenbonnetandshellwhenthereisnodrillingtoolsinthehole,liftoffthebonnet,screwtheliftingboltsintothepacker,thenlifttheoldpackeroutwithropeandreplaceitwiththenewone.Installthebonnet,screwthenuts.2.Pressuretestshouldbeperformedagainafterreplacingtoinspectthesealingcharacteristicsofthepacker.3.Ifthereisadrillingtoolinthehole,thenewpackershouldbefirstcutopenwithtappingknife(withtheaidofpinchbar,soapywatertogreaseknifeedge)（Figure8）Thecuttingsurfaceshouldbesmooth,thenliftthebonnetup.Asthesame,theoldpackershouldbeliftedupwithropeandcutopenit,replaceitwiththenewone.4.TherubberburrofthenewpackershouldberemovedandgreasewithMnS2onthecontactsurfacebetweenthebonnetandthepacker.(Figure8)Replacementofpackerwhendrillingtoolisinwell(Figure8)Replacementofpackerwhendrillingtoolisinwell7.3MaintenanceandReplacing7.3.1AnnularBOPwithsphericalpacker（Figure9ExplodedViewofAnnularBOP）3.Screwingtheliftingboltintothepacker,andliftitoutwithrope.1.3.Screwingtheliftingboltintothepacker,andliftitoutwithrope.1.Unscrew