高含H2S/CO2环境中套管钢腐蚀行为与腐蚀产物膜关系Influence of corrosion scale on corrosion behavior of casing pipe steels in environment containing H2S and CO2
李春福,邓洪达,王斌
摘要(Abstract):
研究了在高含H2S/CO2环境中腐蚀产物膜在套管钢腐蚀过程中作用。通过模拟某气田井下腐蚀环境,采用失重腐蚀方法研究了NT80ss和L80钢钢在1.5MPa、30~120℃环境中腐蚀规律,并采用电化学交流阻抗(EIS)技术和扫描电镜(SEM)分析了腐蚀产物膜和腐蚀行为的关系。结果表明:60℃为NT80ss和L80钢腐蚀的临界温度,低于60℃时,随温度增加,腐蚀速率降低,高于60℃时,腐蚀速率随温度增加而增大;与其它温度相比,在60℃环境中NT80ss和L80钢腐蚀产物膜的阻抗能力最强、膜的致密性最好,相应腐蚀速率最低。
关键词(KeyWords): 套管钢;H2S/CO2共存环境;腐蚀行为;腐蚀产物膜
基金项目(Foundation): 西南石油大学油气藏地质及开发工程国家重点实验室项目(PLN0609)
作者(Author): 李春福,邓洪达,王斌
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