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U.S.DepartmentofLaborOccupationalSafety&HealthAdministration[skipnavigationallinks]Search AdvancedSearch|A-ZIndex IllustratedGlossaryDrillingRigComponentsClickonthenamebeloworanumberonthegraphictoseeadefinitionandamoredetailedphotooftheobject.1.CrownBlockandWaterTable2.CatlineBoomandHoistLine3.DrillingLine4.Monkeyboard5.TravelingBlock6.TopDrive7.Mast8.DrillPipe9.Doghouse10.BlowoutPreventer11.WaterTank12.ElectricCableTray13.EngineGeneratorSets14.FuelTank15.ElectricalControlHouse16.MudPumps17.BulkMudComponentTanks18.MudTanks(Pits)19.ReservePit20.Mud-GasSeparator21.ShaleShakers22.ChokeManifold23.PipeRamp24.PipeRacks25.AccumulatorAdditionalrigcomponentsnotillustratedatright.26.Annulus27.Brake28.CasingHead29.Cathead30.Catwalk31.Cellar32.ConductorPipe33.Degasser34.Desander35.Desilter36.DrawworksEquipmentusedindrilling48.RamBOP49.Rathole50.RotaryHoseHomeGeneralSafetySitePreparationDrillingWellCompletionServicingPlugandAbandontheWell37.DrillBit38.DrillCollars39.Driller'sConsole40.Elevators41.HoistingLine42.Hook43.Kelly44.KellyBushing45.KellySpinner46.Mousehole47.MudReturnLine51.RotaryTable52.Slips53.Spinningchain54.Stairways55.Standpipe56.SurfaceCasing57.Substructure58.Swivel59.Tongs60.Walkways61.WeightIndicatoreToolHome|SitePreparation|Drilling|WellCompletion|Servicing|Plug&AbandonWellGeneralSafety|AdditionalReferences|Viewing/PrintingInstructions|Credits|JSASafetyandHealthTopic|SiteMap|IllustratedGlossary|GlossaryofTerms BacktoTop|FreedomofInformationAct|InformationQuality|CustomerSurveyPrivacyandSecurityStatement|DisclaimersOccupationalSafety&HealthAdministration200ConstitutionAvenue,NWWashington,DC20210U.S.DepartmentofLaborOccupationalSafety&HealthAdministration[skipnavigationallinks]Search AdvancedSearch|A-ZIndex IllustratedGlossaryAccumulatorThestoragedevicefornitrogenpressurizedhydraulicfluid,whichisusedinoperatingtheblowoutpreventers. AnnularBlowoutPreventerAlargevalve,usuallyinstalledabovetherampreventers,thatformsasealintheannularspacebetweenthepipeandwellbore.Ifnopipeispresent,itformsasealonthewellboreitself. AnnulusThespacearoundapipeinawellbore,theouterwallofwhichmaybethewallofeithertheboreholeorthecasing;sometimestermedtheannularspace.HomeGeneralSafetySitePreparationDrillingWellCompletionServicingPlugandAbandontheWellBlowoutPreventerAlargevalve,usuallyinstalledabovetherampreventers,thatformsasealintheannularspacebetweenthepipeandwellboreor,ifnopipeispresent,onthewellboreitself. BrakeThebrakingdeviceonthedrawworkstostopaloadbeinglifted. BulkMudComponentsinStorageHoppertypetanksforstorageofdrillingfluidcomponents. CasingHeadAheavy,flangedsteelfittingconnectedtothefirststringofcasing.Itprovidesahousingforslipsandpackingassemblies,allowssuspensionofintermediateandproductionstringsofcasing,andsuppliesthemeansfortheannulustobesealedoff.Alsocalledaspool. CatheadAspool-shapedattachmentonawincharoundwhichropeforhoistingandpullingiswound. CatlineBoomandHoistLineAstructuralframeworkerectednearthetopofthederrickforliftingmaterial. CatwalkTherampatthesideofthedrillingrigwherepipeislaidtobeliftedtothederrickfloorbythecatlineorbyanairhoist. CellarApitinthegroundtoprovideadditionalheightbetweentherigfloorandthewellheadtoaccommodatetheinstallationofblowoutpreventers,ratholes,mouseholes,andsoforth.Italsocollectsdrainagewaterandotherfluidsfordisposal. ChokeManifoldThearrangementofpipingandspecialvalves,calledchokes,throughwhichdrillingmudiscirculatedwhentheblowoutpreventersareclosedtocontrolthepressuresencounteredduringakick. ConductorPipeThelargestdiametercasingandthetopmostlengthofcasing.Itisrelativelyshortandencasesthetopmoststringofcasing. Anassemblyofsheavesorpulleysmountedonbeamsatthetopofthederrick.Thedrillinglineisrunoverthesheavesdowntothehoistingdrum.DegasserTheequipmentusedtoremoveunwantedgasfromaliquid,especiallyfromdrillingfluid. DesanderAcentrifugaldeviceforremovingsandfromdrillingfluidtopreventabrasionofthepumps.Itmaybeoperatedmechanicallyorbyafast-movingstreamoffluidinsideaspecialcone-shapedvessel,inwhichcaseitissometimescalledahydrocyclone. DesilterAcentrifugaldevice,similartoadesander,usedtoremoveveryfineparticles,orsilt,fromdrillingfluid.Thiskeepstheamountofsolidsinthefluidtothelowestpossiblelevel.CrownBlockandWaterTable DoghouseAsmallenclosureontherigfloorusedasanofficeforthedrillerorasastorehouseforsmallobjects.Also,anysmallbuildingusedasanofficeorforstorage. DrawworksThehoistingmechanismonadrillingrig.Itisessentiallyalargewinchthatspoolsoffortakesinthedrillinglineandthusraisesorlowersthedrillstemandbit. DrillBitThecuttingorboringelementusedindrillingoilandgaswells.Mostbitsusedinrotarydrillingareroller-conebits.Thebitconsistsofthecuttingelementsandthecirculatingelement.Thecirculatingelementpermitsthepassageofdrillingfluidandusesthehydraulicforceofthefluidstreamtoimprovedrillingrates. DrillCollarAheavy,thick-walledtube,usuallysteel,usedbetweenthedrillpipeandthebitinthedrillstem.Itisusedtoputweightonthebitsothatthebitcandrill. DrillPipeTheheavyseamlesstubingusedtorot