7-2-Add-1

SpecificationforThreadingandGaugingofRotaryShoulderedThreadConnectionsANSI/APISPECIFICATION7-2(FORMERLYINSPEC7)FIRSTEDITION,JUNE2008EFFECTIVEDATE:DECEMBER1,2008CONTAINSAPIMONOGRAMANNEXASPARTOFUSNATIONALADOPTIONISO10424-2:2007(Identical),Petroleumandnaturalgasindustries—Rotarydrillingequipment—Part2:ThreadingandgaugingofrotaryshoulderedthreadconnectionADDENDUM1DECEMBER2010EFFECTIVEDATE:JUNE2011Addendum1toSpecificationforThreadingandGaugingofRotaryShoulderedThreadConnectionsSummaryofchangesClause3:DeletereferencetoAPISpec7,includereferencetoAPISpec5DP.Table1,Column9,ChangetoleranceonLPCfrom0/–3to0/–3,18Table1,footnote(c),Replace–5mmwith0/–5mmFigure7(b),Replaceasshown[decreasegroovedepthfrom6,4(0.25)to1,6(0.062)]Table5,Column2,ChangetoleranceonDCBfrom+0,38/0to+0,40/0Table5,Column6,ChangetoleranceonLBGfrom0/–3,1to0/–3,18Table9,footnote(a),ReplaceA.5withA.9Figure14,Keyadd«Note:Fordrillbitpinsonly,toleranceis+0,25/–0,79mm(+0.010/–0.031in)»Figure20,Replacedimension177,8±3,2(7±0.12)with171,4±3,20(6.75±0.13)Clause6.2,Replaceclause,includingTable3(seebelow)TableA.1,Column9,ChangetoleranceonLPCfrom0/–0.12to0/–0.125TableA.1,Column12,ChangetoleranceonQCfrom+0.030/–0.015to+0.031/–0.016TableA.1,footnote(b),Replace–0.19inwith0/–0.2in2SPECIFICATIONFORTHREADINGANDGAUGINGOFROTARYSHOULDEREDTHREADCONNECTIONSTableA.3,Replacethetable(seebelow)TableA.5,Column2,ChangetoleranceonDCBfrom+0.015/0to+0.016/0TableA.5,Column6,ChangetoleranceonLBGfrom0/–0.13to0/–0.125AnnexF,Replacecompletely(seebelow)AnnexI,ReplaceclauseI.4.4throughI.4.6(seebelow)6.2Bevelsfordrillcollarsandtoolsthatmatedirectlywithdrillcollars6.2.1PurposeofbeveldiametersBevelsonconnectionsservetwopurposes.Thefirstistoprotecttheouteredgeofthesealingfacefromdeformationintheformofmashesandfins.Thesecondistoincreasethecontactpressureonthesealingfacesoastominimizeleakingandseparationduetodownholebending.BeveldiametersonthesameOD’sshouldbeofequalsize,withinmanufacturingtolerances,onmatingpinsandboxestominimizetheformationofgroovesonthesealingfaces.WhenmismatchesofOD’sgreaterthan6,35mm(0.250in),mismatchesofbeveldiameterswillalsooccur.Historicallybeveldiametershavebeencalculatedevery6,35mm(0.250in)basedon75percentoftheshoulderwidth.Thisbasiccalculationissimpleanddependsonlyontheoutsidediameterandcounterboreoftheconnection.Efforthasbeenmadetopreservethesehistoricalbeveldiametersbecausetheyareeasytocalculateandhaveworkedverywellinmostcases.6.2.2MethodstocalculatebeveldiametersHoweverithasbeenfoundthatuseofthisprocessalonewillresultinsomeOD-IDcombinationhavingacompressivestressonthesealingfaceabovetheSMYSofthematerial.FEAanalysishasshownyieldofthesealfacewillnotoccurat100percentofSMYS.Becausethesealfacehastohandlethemisapplicationofmake-uptorque,unexpecteddownholetorqueandbendingofthedrillstring,thecalculationofbeveldiametersfordrillcollarsandtoolsthatmatewiththemisbasedonatwo-stepcomputationdescribedindetailinAnnexI.Thecombinationofthetwomethodsensuresthestresslevelsonthesealingfacesdoesnotexceed100percentoftheSMYSforconnectionswithODandIDcombinationscommonlyused.Thetwostepsareidentifiedas:1.The75percentshoulderwidthmethod;2.Themismatchedoutsidediametermethod.ThetwomethodsarefullydescribedinAnnexI.6.2.3OtherconsiderationsTable3(TableA.3)havebeveldiametersthatcoverarangefromasuggestedminimumODtoamaximumOD.ThetablesalsocontainaReferenceID.ThepurposeoftheReferenceIDistobeabletocalculateshoulderloadsthatwillcausethesealfacestressonmismatchedOD’stoexceedtheSMYSoftheproductmaterial.APISPECIFICATION7-2,ADDENDUM13WhentheIDofthedrillcollarortoolsthatmatedirectlywiththemisequaltoorgreaterthanthereferenceID,theminimumODlistedforeachconnectioninTable3(TableA.3)canbematedwiththelargestODlisted(oranyODinbetween)forthatsameconnectioninthetableandthestressonthesealfacewillnotexceed100percentofSMYS.ThesmallestbeveldiametershowninTable3(TableA.3)isthesmallestbeveldiameterrecommendedforeachconnectionifthesealfacestressgeneratedbymismatchesofOD’sisnottoexceedtheSMYS.Beveldiametersforlow-torquefeatureshavebeenarbitrarilysetandshallnotincreaseordecreasewithdiameterchanges.BeveldiametersinTable3(TableA.3)shallnotapplytoproductsthathavespecificrequirementsinAPISpec7-1,APISpec5DP,ISO10424-1andISO11961,suchastooljointsfordrillpipeandHWDP,bits,orboxesthatmatewithbits.Unlessotherwisespecified,beveldiametertolerancesshallbe±0,4mm(±0.016in).Caution:ThebeveldiameterssetforthinthisstandarddonotaccountforallpotentialmismatchesthatcanoccurwhencomponentswithsignificantlydifferentboxOD,pinIDorbeveldiametersaremadeup.Connectionswithsuchmismatcheddimensionscanresultinsealstressesinexcessofthespecifiedminimumyieldstrengthofthematerialwhichincreasestheriskofgalling,finningandmechanicaldamagetothesealface.4SPECIFICATIONFORTHREADINGANDGAUGINGOFROTARYSHOULDEREDTHREADCONNECTIONSTable3—ReferencebeveldiametersforPreferredconnectionswhenusedondrillcollars,inSIunitsDimensionsinmillimetresConnectionstyleandsizeRefIDdBeveldiametersaforvariousOD’sb,cNC2328,58OD79,38BD76,20NC2638,10OD85,7288,9092,0895,2598,42BD84,53e84,53e87,7187,719