CO2腐蚀产物膜形态结构与温度和压力的关系

!#CO231,21,21,213(1121CNPC31)3N80P110J55CO2,,3,,;3,120,;3;3CO2,CO26189MPa,,,21,3;90CO23CO2CO2,CO2,FeCO3,CO2,[1],2Schmitt[2]60CO2[25]60,FeCO3,,,;60110,,;110,,,;150,,FeCO3Fe3O4,[6]CO2,Palacios[4]N80CO2,;[7]N803014d,3,,11N80P110J55,13010mm2610mm118mm,120#400#600#800#1000#,,,(g/L):(Cl-)1910,(SO2-4)1114,(HCO-3)016,(Mg2+)1105,(Ca2+)0139,(Na+)11199,(CO2-3)0112Cortest34414105Pa,,,N26h,CO28h,12005332CHINAPETROLEUMMACHINERY3973(G1999065004)(50231020)©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1)1N80(120)(160)200SEM,2,,,FeCO3CaCO3,[5,8,9],,,,;,,,,;200,,,,,,,FeCO3,,,,,,,1N80SEM10003CO2(Tc=304119K,pc=7138MPa)SEM22,,,,,,CO2,2CO2(90,10134MPa)SEM1500(2)3a3bJ5590,0176MPa120,1193MPaSEM,2,22005332©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.[5,8,10]3cP110100,0176MPaSEM,132m37m,,,365021(1)311382107MPa4,3,11120,,120,N80J55P110,120P110;120200,,(),3,N80J55160,P110180N80,160,180,,,FeCO3,4(2)35,3,113120,N80J552160,P1101803,,,,,531(1)390CO266CO2,6189MPa,,P110,N80J554113MPa;6189MPa3;6189MPa,32005332:CO2©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(Tc=304119K,pc=10171MPa)CO2,CO2CO2-3,,,(2)90CO2377CO2,3,21,136189MPa,N80P1103145MPa,J552141MPa;N80P11025151MPa,J554113MPa,,,,,[10],(1),3,,(2)3,120,;3(3)3CO2,CO26189MPa,,;21,3(4)90CO23,901BurkePA1Synopsis:recentprogressintheunderstandingofCO2corrosion,AdvancesinCO2CorrosionVol111Corrosion’94,PaperNo13,Houston,TX:NACEIn2ternational,19932SchmittG,RothmanB1Corrosionofunalloyedandlowal2loyedsteelsincarbonicacidsolutions,inCO2CorrosioninOilandGasProduction-SelectedPapers,AbstractsandReferences1NACE,USA,19843IkedaA,UedaM.PredictingCO2corrosionintheoilandgasindustry1London:TheInstituteofMaterials,1994:594PalaciosCA,ShadleyJR1CharacteristicsofcorrosionscalesonsteelsinCO2-sateratedNaClbrine1Corrosion,1991,47(2):1221275,,11,1998,13(5):34406,11,1995,16(3):1341397,,1N80CO21,2002,38(4):4114168,,1X52CO21,2001,13(4):23623891()1:,1999:21110DugtadA1TheimportanceofFeCO3supersaturationontheCO2corrosionofcarbonsteels1Corrosion’92,PaperNo114,Houston,TX:NACEInternational,1992:,,1966,2000,,:(710065):[phone]E-mail:Lingf808@1261com:2004-06-10()42005332©1994-2006ChinaAcademicJournalElectronicPublishingHouse.Allrightsreserved.(1.SchoolofMaterialScienceand.Engineering,XianJiaotongUniversity,Xian;2.TubularGoodsResearchCenterofCNPC,Xian),BaiZhenquan,ZhaoXinwei,etal.EffectoftemperatureandpressureonprofileofC02corro2sionscalesonoilwellsteelsCPM,2005,33(2):14ThecorrosionprocessofthreekindsofoilwellsteelsinC02environmentwithvaryingtemperatureandC02partialpressureissimulatedbymeansofstaticautoclave.Andtheeffectoftempera2tureandC02partialpressureonthicknessandgrainsizeofthescalesisstudiedbyusingScanningElectronMicroscope(SEM).Theresultsshowthat,thecross-sectionsofthecorrosionproductscalesofthethreekindsofsteelsaredouble.1ayeredinstruc2ture.Thevariationofscalethicknessofthesteelswithrespecttothetemperatureisinthesamepattern,ofwhichthemaximumscalethicknessappearsat120,whiletheminimumofthescalethicknessisvariantfortllethreesteels.Thevariationsofthegrainsizewithrespecttothetemperatureforthethreesteelsexhibitapeakandavalley.Thetemperaturesandgrainsizecorrespondingtothepeakandvalleyfordifferentmaterialsvary,butthetemper2aturescorrespondingtothepeakandvalleyofscalethicknessarethesameforthethreesteels.ThevariationofscalethicknessforthethreekindsofsteelswithC02partialpressureisalsointhesimilarpattern,ofwhichthemaximumscalethicknessappearsattheC02partialpressureabout6.89MPa,andthendecreasedrapidly.ThevariationsofgrainsizewithC02partialpressureforthethreesteelsexhibittwopeaksandavalley.HowevertheC02partialpressuresandgrainsizescorrespondingtothepeaksandvalleyfordifferentmaterialsvary,andgrainsizesofthethreesteelswithC02partialpressuredecreasedquicklybeyondthep2eaks.Keywords:C02corrosion,corrosionscale,profile,tempera2ture,pressure,scalethickness,grainsizeLuoJinheng(1.SchoolofMaterialsScienceandEngineer2ing,XianJiaotongUniversity,Xian;2.TheKeyLaboratoryforMechanicalandEnvironmentalBehaviorofTubularGoods,CNPC,Xian),ZhaoXinwei,XiongQingren,eta1.Anewmod2elforpredictingdefectivepipelinefatigue-lifeandverifica2tionthroughfull-scaletest.CPM,2005,33(2):57Itisnotpracticaltopredictthefatiguelifeofmaterialswithhightoughnessbyusingthetraditionalfatigue-lifepredictionmethod.Inthisarticle,anewmodel,usingParisfatiguecrackgrowthexpressions,da/dN=c(K)n,isbuilttopredictthere2mainedfatiguelifeofpipelinebasedonFAD(FailureAssessmentDiagiam)technique.Toughnessratioandloadratioarecalculatedrepeatedlywimeverycrackincrementinthemodel.