DOI:10.11973/fsyfh-202212010CO2-EOR油井井下附件腐蚀行为陈菊1,管英柱1,王长权1,陆梅2,张金发1,但植华1(1.长江大学石油工程学院,武汉430100;2.长庆油田油气工艺研究院,西安710018)摘要:采用高温高压动态腐蚀试验和电化学试验,研究了35CrMo、3Cr13、45号钢三种材料在13MPa、60℃,CO2含量(体积分数)为20%、50%、80%,井流物(地层水和原油混合物)以3mL/min循环注入的模拟CO2气驱强化采油(EOR)油井环境中的腐蚀规律,并采用扫描电子显微镜(SEM)对腐蚀产物形貌进行了表征。结果表明:3Cr13钢的最大腐蚀速率为0.006mm/a,仅发生轻微CO2腐蚀,35CrMo和45号钢的最小腐蚀速率均大于0.076mm/a,耐CO2腐蚀效果差;低Cr(0~9%)钢的腐蚀速率随CO2含量的增加反而降低;3Cr13钢适合作为CO2-EOR油井的井下附件材料。关键词:CO2气驱强化采油(CO2-EOR);井下附件;高温高压;腐蚀速率中图分类号:TG174文献标志码:A文章编号:1005-748X(2022)12-0063-05CorrosionBehaviorofCO2-EORDownholeAccessoriesinOilWellsCHENJu1,GUANYingzhu1,WANGChangquan1,LUMei2,ZHANGJinfa1,DANZhihua1(1.CollegeofPetroleumEngineering,YangtzeUniversity,Wuhan430100,China;2.Oil&GasTechnologyResearchInstitute,ChangqingOilfieldCompany,PetroChina,Xi'an710018,China)Abstract:Thecorrosionbehaviorof35CrMo,3Cr13and45#steelinsimulatedCO2dioxideenchancedoilrecovery(CO2-EOR)oilwellenvironmentat13MPa,60℃,withCO2content(volumefraction)of20%,50%and80%andwellflowmaterialinjectedcircularlyat3mL/minwerestudiedbymeansofhightemperatureandhighpressuredynamiccorrosiontestandelectrochemicaltest.Themorphologyofcorrosionproductswascharacterizedbyscanningelectronmicroscopy(SEM).Theresultsshowedthatthemaximumcorrosionrateof3Cr13steelwas0.006mm/a,andonlyslightCO2corrosionoccurred.Theminimumcorrosionratesof35CrMoand45#steelwerebothgreaterthan0.076mm/a,andtheCO2corrosionresistancewaspoor.ThecorrosionrateofsteelswithlowCr(0-9%)decreasedwiththeincreaseofCO2content.3Cr13steelwassuitableasdownholeaccessorymaterialofCO2-EORoilwell.Keywords:CO2dioxideenchancedoilrecovery(CO2-EOR);downholeaccessory;hightemperatureandhighpressure;corrosionrate早在20世纪初,国外就有了CO2气驱强化采油(CO2-EOR)这一观点,随后的三十多年间,作为全世界范围内的...
