N80钢在模拟减氧空气驱生产井中的腐蚀行为.docxVIP

2024年第53卷第14期Vol.53No.142024

热加工工艺

HotWorkingTechnology

ISSN1001-3814CN61-1133/TG

DOI:10.14158/j.cnki.1001-3814.rjggy@

N80钢在模拟减氧空气驱生产井中的腐蚀行为周凯丽,史宝成,薛琨,潘建澎,张兴凯,刘凯,伍丽娟(长江大学油气钻采工程湖北省重点实验室,湖北武汉430110)

摘要院为了探究N80钢在减氧空气驱生产井中的腐蚀行为袁基于灰色关联分析法袁分析了国内某减氧空气驱生产井的腐蚀主控因素袁并以油藏模拟结果作为室内模拟参数袁采用动态失重法结合金相显微镜尧XRD尧3D形貌等相关表征袁研究了不同生产时期N80钢的腐蚀行为遥结果表明院氧含量对减氧空气驱生产井腐蚀的敏感性最大袁在含氧工况下袁N80钢的腐蚀速率显著增加袁氧含量3%渊0.3MPa冤时的腐蚀速率是不含氧的5倍左右遥在驱油初期袁腐蚀为CO2主导的局部腐蚀袁腐蚀产物主要为致密的FeCO3遥随着注气时间的延长袁井筒内为CO2/O2均衡环境袁腐蚀转变为二者共同作用袁腐蚀产物为FeCO3和疏松多孔的Fe2O3遥在持续注气3年后袁生产井内为高O2+低CO2环境袁致密的FeCO3遭到破坏袁腐蚀坑横向发展袁腐蚀转变为由O2主导的全面腐蚀遥

关键词院N80钢曰减氧空气驱曰生产井井筒曰灰色关联度分析曰O2/CO2腐蚀

中图分类号院TG172 文献标识码院A 文章编号院1001-3814(2024)14-0087-06

CorrosionBehaviorofN80SteelinSimulatedOxygen-reducedAirFloodingProductionWell

ZHOUKaili,SHIBaocheng,XUEKun,PANJianpeng,ZHANGXingkai,LIUKai,WULijuan

(HubeiKeyLaboratoryofDrillingandProductionEngineeringforOilandGas,YangtzeUniversity,Wuhan430110,China)Abstract院InordertoexplorethecorrosionbehaviorofN80steelinoxygen-reducedairfloodingproductionwells,the

maincontrollingfactorsofcorrosioninadomesticoxygen-reducedairfloodingproductionwellwereanalyzedbasedonthegreyrelationalanalysismethod.Takingthereservoirsimulationresultsaslaboratorysimulationparameters,thecorrosionbehaviorofN80steelindifferentproductionperiodswasstudiedbydynamicweightlossmethodcombinedwithmetallographicmicroscope,XRD,3Dmorphology.Theresultsshowthattheoxygencontentisthemostsensitivetothecorrosionoftheproductionwellwithoxygen-reducedairflooding.Undertheoxygencontainingcondition,thecorrosionrateofN80steelincreasessignificantly,andthecorrosionratewhentheoxygencontentis3%(0.3MPa),whichisabout5timesthanthatwithoutoxygen.Intheinitialstageofoildisplacement,thecorrosionislocalizedcorrosiondominatedbyCO2,andthecorrosionproductsarem