在役L245M输油管道腐蚀穿孔的原因
Corrosion and Perforation Reasons of L245M Oil Pipeline in Service
摘 要
为研究L245M输油管道在服役期内出现腐蚀穿孔失效的原因,采用金相显微镜、扫描电镜、能谱仪及X射线衍射仪等分析了失效管道的显微组织、蚀坑形貌和腐蚀产物成分。结果表明: 腐蚀产物主要为Fe、O、S、Cl的化合物,结合现场环境发现管道运输的凝析油中含有Cl-、H2O、H2S以及CO2等物质,这些物质对管道金属具有腐蚀作用,并且形成的腐蚀产物会加快管道腐蚀,在这些侵蚀性物质与腐蚀产物的共同作用下,管道发生点蚀,最终穿孔。
点蚀
腐蚀产物
L245M pipeline
pitting
corrosion product
Abstract
In order to study the reasons for corrosion and perforation failure of L245M oil pipeline in service, the microstructure, pit morphology and corrosion product composition of the pipeline were analyzed by metallographic microscopy, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results showed that the corrosion products were mainly composed of the compounds of Fe, O, S and Cl. Combined with the on-site environment, it was found that the condensate oil transported by pipeline contained Cl-, H2O, H2S, and CO2. These substances could corrode the pipeline metal, and the corrosion products could accelerate the corrosion of pipeline. Pitting and eventual perforation occurred in the pipeline in the combined action of these corrosive substances and corrosion products.
中图分类号 TG172 DOI 10.11973/fsyfh-202311018
所属栏目 失效分析
基金项目 南充市市校合作项目(SXQHJH032)
收稿日期 2021/12/18
修改稿日期
网络出版日期
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引用该论文: WANG Liang,HU Yiwen,QIAN Yuhang,ZHOU Peishan,WANG Bin,ZHENG Hualin. Corrosion and Perforation Reasons of L245M Oil Pipeline in Service[J]. Corrosion & Protection, 2023, 44(11): 101
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参考文献
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【6】李芳, 张建军,张江江,等.塔河油田某油井管件在H2S/CO2/高矿化度耦合环境失效分析[J].热加工工艺,2022,51(6):156-160.
【7】李国浩, 谷坛,刘志德,等.CO2和Cl-共存条件下L245NB钢的腐蚀行为[J].材料保护,2008,41(8):62-63,71,82.
【8】GRIFFITHS A J,HUTCHINGS R B,TURNBULL A.Validation of the role of bulk charging of hydrogen in the corrosion fatigue cracking of a low alloy steel[J].Scripta Metallurgica et Materialia,1993,29(5):623-626.
【9】杨军征, 张玉楠,邹洪岚,等.油田注水井的腐蚀风险研究[J].材料保护,2019,52(3):51-54.
【10】高志伟. 多离子混合体系中抽油杆腐蚀坑扩展演化研究[D].青岛:中国石油大学(华东),2017.
【11】徐玮辰, 于菲,刘敏.钢铁点蚀坑内腐蚀产物对点蚀扩展的影响[J].材料保护,2017,50(11):5-8.
【12】曾文广, 葛鹏莉,肖雯雯,等.酸性环境下界面对低合金管材点蚀的影响[J].材料保护,2020,53(10):9-14,24.
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