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·20089·2008121[1],,。,,。。(SCC)。。2[2]:、。(1)。;,,。,,,。(2),,,。,,,,,,,。(3),。。3(SCC)[3],、、。:,。,,,,,。,,,,,*1,21331.(213016)2.(213016)3.(211600),-。,,,,。。AbstractThispaperfirstanalyzestheoccurrenceconditionsandcorrosionmechanismofstresscorrosionaboutwellheadequipmentmaterials.Meanwhile,thematerialpropertiesforresistingstresscorrosionareevaluatedfromtheperspectiveofreliabilityaccordingtothestressandstrengthinterferencetheory.Thereliabilitycalculationformulainthenormaldistributionofthestressandstrengthhasbeeusedtocalculatethematerialreliabilityunderthedifferentstress,togetherwiththesafetyfactorunderthereliability.Thenthereliabilityofwellheadequipmentmaterialcanbepromotedsoastoguaranteethesafeoperationofequipments.Atlast,experimentalstudyhasproveditsflexibility.Keywordswellheadequipment;stresscorrosion;reliability;safetyfactor*:(CY0606)“”(BA2005041)。27TECHNOLOGYSUPERVISIONINPETROLEUMINDUSTRY·20089·200812,、、、,,SCC,,。4H2SCO2,,,。、,,。,。,。,,,。1-[4,5],“”、“”、“”。“”,,。“”“”,(、、)。,“”。,,,,。,。-,-。,-。2,,。,,,。,。,,-。,。,,ZR,。Sδ,:f(S)=1σS2π姨exp-12S-μSσSSS222,-∞<S<+∞(1)f(δ)=1σδ2π姨exp-12S-μδσδyS222,-∞<δ<+∞(2)μS,μδσS,σδSδ。y=δ-S,yh(y)=1σy2π姨exp-12y-μyσyyS222,-∞<δ<+∞(3)δ>Sy=δ-S>0,RR=P(y>0)=∞0乙1σy2π姨exp-12y-μyσyyS222dy-∞<δ<+∞(4)z=y-μyσy(5)R=12π姨∞-μδ-μSσδ2+σS2姨乙e-z22dz=12π姨∞-μyσy乙exp-z2222dz(6),z=(y-μy)/σy,RΦ(z),:R=1-Φ(z)=1-Φ(-μδ-μSσδ2+σS2姨)=Φ(μδ-μSσδ2+σS2姨)=Φ(zR)(7)28TECHNOLOGYSUPERVISIONINPETROLEUMINDUSTRY·20089·200812zR,zR,R。,。、、[6]、,。,,,,,,,。、,,,,。,Sδ,(7)。3(1)NACE[7],1Cr13,,1。34,12。:A=Lu-L0L0×100%,34:3:A=Lu-L0L0×100%=0.371525.4×100%=1.46%<5%4:A=Lu-L0L0×100%=0.396625.4×100%=1.56%<5%,。12,,。1,1.14δS,,;2,1.20δS,,-。:,,,,。,,。,,,。(2),/mm/h/h/mm1/℃pH/h1243~4517N/mm2(σS)-2243~4556.75N/mm2(1.08σS)-3243~4589.5N/mm2(1.14σS)1654243~4622.25N/mm2(1.20σS)331-(1.14σs)2-(1.20σs)29TECHNOLOGYSUPERVISIONINPETROLEUMINDUSTRY·20089·200812,。,,。、,。,,,:。,,。:n=δ軃S軈=1+zRCδ2+CS2-zR2Cδ2CS2姨1-zR2Cδ2(8)δ軃,S軈δS;Cδ,CSδS;zR。(3)1Cr13,655MPa,1Cr13588MPa。,517MPa(σS)、556.75MPa(1.08σS)、589.5MPa(1.14σS)622.25MPa(1.20σS)。=3×()22MPa,35MPa。。(7)μδ=655MPa,μ=517MPa,R=Φ(655-517222+352姨)=Φ(3.34)=0.9996μδ=655MPa,μ=556.75MPa,R=Φ(655-556.75222+352姨)=Φ(2.38)=0.9913μδ=655MPa,μ=589.5MPa,R=Φ(655-589.5222+352姨)=Φ(1.58)=0.9429μδ=655MPa,μ=622.25MPa,R=Φ(655-622.25222+352姨)=Φ(0.79)=0.7852,,,,。,。,。589.5MPa622.25MPa,0.99,:R=0.99zR=2.33,n=δ軃S軈=1+zRCδ2+CS2-zR2Cδ2CS2姨1-zR2Cδ2589.5MPa,Cδ=22655=0.034,CS=S-S軈S=589.5-571.37589.5=0.031n=1+zRCδ2+CS2-zR2Cδ2CS2姨1-zR2Cδ2=1+2.330.0342+0.0312-2.332×0.0342×0.0312姨1-2.332×0.0342=1.11622.25MPa,Cδ=22655=0.034,CS=S-S軈S=622.25-571.37622.25=0.082n=1+zRCδ2+CS2-zR2Cδ2CS2姨1-zR2Cδ2=1+2.330.0342+0.0822-2.332×0.0342×0.0822姨1-2.332×0.0342=1.21,589.5MPa622.25MPa,0.99,1.111.21。,589.5MPa622.25MPa,165h33h,;,0.99,:0.99,720h。,,。(1),,。(2)、,(68)30TECHNOLOGYSUPERVISIONINPETROLEUMINDUSTRY·20089·200812(30),,,,。[][1],.[J].,2007,17(2):16-19.[2],.[J].,2007,28(2):105-107.[3].[J].,2006(12):47-48.[4].[M].:,1996.[5].[J].,2004,23(4):27-29.[6]Y.Y.Chen,Y.M.Liou,H.C.Shih.Stresscorrosioncrackingoftype321stainlesssteelsinsimulatedpetrochemicalprocessenvironmentscontaininghydrogensulfideandchloride[J].MaterialsScienceandEngineering,2005,407:114-126.[7]NACETM0177-1996,LaboratoryTestingofMetalsforResistancetoSpecificFormsofEnvironmentalCrackinginH2SEnvironments[S].,,1954,,、,50,1,1。。::2008-11-18(47)。,25《》:。,,。,。、、,,。,196611,、,。::2008-11-18,。,,,。,,,,,,,。,,,。,,1958,,。89::2008-11-1868TECHNOLOGYSUPERVISIONINPETROLEUMINDUSTRY
本文标题:井口装置材料抗应力腐蚀的可靠性评价
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