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,,(,430074):,,:;;;:TG115.28+4:A:100026656(2001)0220055204MEASUREMENTOFWALLTHICKNESSOFOILWELLTUBINGBYMAGNETICBRIDGE-BASEDMETHODJINJian-hua,KANGYi-hua,YANGShu-zi(CollegeofMechanicalScienceandEngineering,HuazhongUniversityofScienceandTechnology,Wuhan430074,China)Abstract:Duringproductionprocess,lossofwallthicknesssuchasrodwear,relativelylargeareasofcorro2sionisoneofthemainsourcesoffailureofusedoilwelltubing.Anewmagneticbridge2basedmethodisdescribed,whichemploysintegratedHallelementsarrangedinthemagneticfluxmeasuringbridgestomeasurethewallthick2nessofatube.Thepotentialdetectioncapabilitiessuchasmeasurementsensitivity,accuracy,range,etcarealsodiscussed.Themethodisespeciallysuitableforinsituquantitativeinspectionoftheusedoilwelltubingscoveredwithdrillingmudorothernon2magneticmatter.Keywords:Magnetictesting;Hallelement;Wallthickness;Oiltubing,,,,[1,2],(),,,(MagneticBridge2BasedMethod),1:2000202202[36],11()1.2.3.5523220012NDTVol.23No.2Feb.2001©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,[7,8],,(),(D1),22,:(1),(2),,(3)D1D2D10.2tbD20.2lmtblm;,,2,,33Rt;Rrii(i=1,2,,8);Rbii;Raii;F1,F23,Kirchkoff5t=8i=15ai(1)5bi=5ri-5ai(2)5t5aiiD25bii5rii,(1),(2)8i=1(BvriAri-BvbiAbi)=BvtAt(3)BvriiAriiBvbiiAbiiBvtAt,AriAbi,BvriBvt,Ari=ArAbi=AbBvri=Bvr(4),65:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.VH=8i=1VHi=KH8i=1Bvbi=KHAb(8BvrAr-BvtAt)(5)VHVHiiKH(5),$VH=ûVH-VH0û=KHBvtAb(At0-At)=KHBvtAb$At=Ks$At(6)$VHVH0At0$AtKsKs(5),(6),VH($VH)At($At),At=At0-$At(7)rR,tav,tav=AtP(R-r)(8)2VHAt,,4,2,,(NdFeB),,D1,D223mm,2.81V473mm5.5mm16m(9.75m,,5);29.75m,5UGN3503,100mT,100mT13VöT,5V,2.5VVHi,,,VH=8i=1VHi16,,$VH675:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.$At,$VH=Ks$At(9)Ks=17.33mVömm272,,3m,4.84mm,,,(0.8m),,2733.1Ks,Ks=$VH$At=KHBvtAb(10)(10),KsKHBvtAb(5),(6),KHVH0BvriBvt,,,,,1020mVömm2,0.05mm3.2,,,0BvH,,Bvb0(0100mT),0Arange,Arange=Vrb-V0bKs(11)VrbBvb=BvHV0bBvb=Bvb0(11),Bvb0Ks3.3(),,(),200mm3.4,,,3.5,,0.51.0m4,,,,,,:(77)85:©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.X,(),,(5)(4),,5ABC5,,,,,:[1].[M].:,1988.[2]GB3323-1987,[S].(58)[1]EdensWC.Electromagneticinspection:walllossandflawlocationinoilcountrytubulargoods[J].Materi2alsEvaluation,1992,50(4):476-490.[2]MooreDP,BayarsHG.Economicsimportantinse2lectingmonitoringtechniques[J].OilandGasJour2nal,1990,88(32):68-73.[3]RodericKS.Simpleexplanationofthetheoryofthetotalmagneticfluxmethodforthemeasurementofferromagneticcrosssections[J].MaterialsEvalua2tion,1995,53(1):71-75.[4]KirkwoodGJ,StanleyKR.Total2fluxmagneticmethodforinspectionofinstalledferromagnetictubing[J].MaterialsEvaluation,1992,50(4):502-505.[5]KitzingerF,NaudJR.Newdevelopmentsinelectro2magnetictestingofwirerope[J].CIMBulletin,1979,72(6):99-104.[6]StanleyRK.Magneticmethodsforwallthicknessmeasurementandflawdetectioninferromagnetictubingandplate[J].INSIGHT,1996,38(1):51-55.[7],,,.[J].,1999,20(3):285-286,293.[8],,,.[J].,1998,20(2):34-38.(73)nalequation[J].JourofAppliedPhysics,1997,79(9):6397-6406.[10]ClarkR.Aninvestigationofhorizontalaxiscoilforeddycurrentinspection[J].NDTInternational,1989,25(6):331-338.[11]LiuZ.One2dimensionaleddycurrentmulti2frequent2lydatafusion:amulti2resolutionanalysisapproach[J].INSIGHT,1998,40(4):286-288.[12]CollinoF.Newabsorbingboundaryconditionsforthefiniteelementsolutionof3DMaxwellpsequa2tions[J].IEEETransactionsonMagnetics,1995,31(3):1696-1701.[13]RaeBPC.Delineationoffeaturesineddycurrentim2age[J].ActsStereologica,1997,(1):69-74.[14]ThomasW.Eddycurrentimaging[J].MaterialsE2valuation,1993,51(4):444-451.[15]FlashertyJ.Overviewofeddycurrentdataandim2agerecordingmethod[J].MaterialsEvaluation,1991,49(1):22-27.[16]PremelD.Eddycurrenttopographyincylindricalge2ometry[J].IEEETransactionsonMagnetics,1995,31(6):2000-2003.[17]StepinsklT.Analysisofeddycurrentpatterns[J].BritishJournalofNDT,1990,32(2):631-633.[18]VdpaSS.AFourierdescriptorclassificationschemeofdifferentialprobesignal[J].MaterialsEvalua2tion,1994,52(8):1136-1141.[19],,.[J].,1998,20(10):271-273.[20].1993,[J].,1994,43(6):329-334.[21].1994.[J].,1995,44(6):379-383.[22]ValleauAR.Eddycurrentnondestructivetestingofgraphitecompositematerials[J].MaterialsEvalua2tion,1990,48(2):230-239.77:X©1995-2004TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.