油气井套管CO2点状腐蚀剩余强度分析

3,:,1967,,;:(610500):[phone]E2mail:[e-mail]2311221234(1.2.3.4.).CO2.,2006,26(2):95297.CO2,,CO2(),,CO2,,,,,,,,,(12),::(t)(Ro)(Ri)(Rw)(d),(a):,(T)(Po)(Pl):(TD)(PDO)(PDI):(d)(t)(dD),:a=2R2w-2(Ro-Rw)(Rw-d)-d22(Ro-Rw+d)2(1)123D,,0.3m1/2,3:,,(),vonMises3(1)592623,,,,;,,VonMises,,(2),,VonMi2ses,,(3),,VonMises,(4),,VonMises,,,,,VonMises,,(5):,,VonMises,,,,,,,,,,,,(,10%,1.5%),:177.8mm,9.19mm,N80,454545,:,,0%10%,70%,;,,10%80%,40%70%;,0,80%100%,40%0,,50%,70%,50%,,692006250%(),,,,:PDI=-5.4588t6D+1.5766t5D+17.148t4D-24.129t3D+13.538t2D-3.679tD+1.0022R=0.9994(2)R:PDO=28.547t6D-113.89t5D+167.1t4D-116.64t3D+40.574t2D-6.6803tD+0.9974R=0.9991(3):TD=35.991t6D-120.75t5D+154.01t4D-96.324t3D+31.432t2D-5.3621tD+0.9991R=0.9996(4),6,,0.999,,:,tD,tD(2)(3)(4)PDIPDOTD,PDIPDOTD,PIPOT,1CO2()()()()()()()()0.010.9485270.9345390.966740.160.6401540.5875360.6724730.020.9036840.8791170.9338450.180.6306380.5841650.655760.030.8640470.8304910.9033770.20.6234470.5839220.6420760.040.8291250.7880580.87520.30.5988980.5932580.6015060.050.798460.7512490.8491860.40.5722390.5806150.5755110.060.7716270.7195330.8252070.50.5500970.5514840.5421660.070.748230.6924080.8031410.60.5407480.5335820.4978690.080.7279010.6694090.7828710.70.5258320.5326740.4447710.090.7103010.6500980.7642810.80.4579730.508950.3753970.10.6951150.634070.7472620.850.3867130.4624540.3252260.120.6708590.6103770.7175170.90.2843210.373960.2544820.140.6531010.5956310.6928330.950.1514470.2276820.150973(1),(2),,,CO2,,,,,(3)CO2,CO2[1].CO2[J].,2002,16(6).[2].1[J].,2004,24(10).[3].1[J].,2004,24(10).[4].2[J].,2005,25(2).(2005209213)79262swellingtestsofradial6.2%and16.5%areconductedrespectivelyfor3domestically2madeAPIJ55casingswithÁ114.3mmandwallthickness6.35mmundertheoriginalstateandtheheattreatingstate.Thegeometricalaccuracy,therelativeproper2tiesofmaterialsandtherealphysicalpropertyofcasingsareidentifiedbeforeandaftercasingswelling.ItisfoundAPIJ55cas2ingsstillhavegoodindexesofbasicperformanceaftertheradialswellingof16.5%.Also,itisfounditishardforthecasingstochangetheirshapeduetothematerialproperty,andthecollapseresistancedecreasesobviouslyaftercasingswelling.SUBJECTHEADINGS:welldrilling,wellcementation,swellablecasing,API,material,testZhangJianbin,bornin1974,gotaPh.DdegreefromSouthwestPetroleumInstitutein2003,andisengagedinresearchonma2terialsciencesandpetroleumengineering.Add:ChangqingPetroleumExplorationBureau,151WeiyangRd.,Xi’an,ShaanxiProvince710021,P.R.ChinaTel:86229286594626E2mail:[e-mail](WestSichuanOil&GasGatheringandDeliveryUnitofSinopecSouthwestBranch).NATUR.GASIND.v.26,no.2,pp.92294,02/25/2006.(ISSN1000-0976;InChinese)ABSTRACT:ItisprovedbyproductionthatthegasreservoiratSectionXu2inHexingchangareaisabottom2waterdrygasreservoirwithfracture2poredualmedium,lowporosity,lowpermeability,heterogeneity,abnormalhighpressure,highirre2duciblewatersaturation,andunitedpressuresystem.Intheprocessofproduction,severecorrosionandbreakdownofthetub2ingstringshappenfortheproductionwellssinceomittingtheanti2corrosionmeasures.Byinvestigationandanalysisofcorro2sion,itisfoundthatCO2isthemaincauseleadingtothetubingcorrosioninthegasreservoiratSectionXu2.Meanwhile,manyfactors,suchasthemediumtemperature,theCO2fractionalpressure,watermediumcompositionetc.,influencethecor2rosion.Withsimulationtests,thecountermeasuresareproposedsuitablefortubingcorrosioninthegasreservoiratSectionXu2.Firstofallitistousecorrosion2proofalloyinthewholeholeortheinterval(6001500m)wherecorrosionissevere.ThesecondaryproposalistouseQHS21orUT215ascorrosioninhibitor.Otherwisethefirstandthesecondproposalscanbecom2binedtouse.SUBJECTHEADINGS:Sichuan,west,gasreservoiratSectionXu2,naturalgas,tubingcorrosion,corrosioncontrolZhouJing(engineer),bornin1976,graduatedfromSouthwestPetroleumInstitutein1997,andheisengagedinthedevelop2mentofgasfields.Add:WestSichuanOil&GasGatheringandDeliveryUnitofSinopecSouthwestBranch,399NorthTaishanRd.,DeyangCity,SichuanProvince618000,P.R.ChinaTel:86283828944690E2mail:[e-mail]ENGTHOFCO2TUBERCULARCORROSIONFORCASINGSOFOIL/GASWELLSShiXiaobin1,ChenPing1,XuJing2,JiangZujun2,NieRongguo1,QingXiaoqing2,ZhaoDapeng3,WangDaxun4(1StateKeyLaboratoryofReservoirGeologyandDevelopmentEngineering,SouthwestPetroleumInstitute;2SinopecSouthwestPetroleumBureau;3PetroChinaSouthwestOil&GasfieldCompany;4ChongqingUniversityofScienceandTechnology).NATUR.GASIND.v.26,no.2,pp.95297,02/25/2006.(ISSN1000-0976;InChinese)ABSTRACT:ThecasingcorrosionisquitesevereinCO2oil/gaswellswithhightemperatureandpressure.CO2corrosionmain2lyistubercularcorrosion.Thecorrosionshapemostlyappearsspherical.Accordingtotheresidualstrengthofcasingsaftertu2NATURALGASINDUSTRY,vol.26,no.2February25,2006bercularcorrosion,withelastic2plasticfiniteelementmethod,thechangesofcollapseresistance,burststrength,andtensilere2sistanceofcasingsareanalyzed.Withdimensionlessanalysisand