某油井P110油管腐蚀穿孔原因
Cause of Corrosion and Perforation of P110 Tubing in an Oil Well
摘 要
西部油田某油井油管发生严重腐蚀甚至穿孔。通过宏观形貌和显微组织观察、化学成分分析、硬度测试、拉伸和冲击性能测试、腐蚀产物检测等方法对油管失效原因进行了分析。结果表明：油管在含Cl-、H2S、CO2酸性环境下发生了均匀腐蚀和局部腐蚀。均匀腐蚀由H2S-CO2-H2O （Cl-）体系引起的析氢腐蚀所致；而CaCO3沉积造成的微电偶效应以及Fe2+与地层水中Cl-的水合作用导致了油管的局部腐蚀穿孔。建议油井管材采用具有一定抗硫性的P110-3Cr钢或耐蚀性能更优的钢，并添加缓蚀阻垢剂进行防护。
穿孔
析氢腐蚀
局部腐蚀
P110 tubing
perforation
hydrogen evolution corrosion
localized corrosion
Abstract
The tubing of an oil well in western oilfield was corroded severely and even perforated. The cause of the tubing failure was analyzed by macroscopic morphology and microstructure observation, chemical composition analysis, hardness test, tensile and impact performance test, corrosion product detection. The results show that uniform corrosion and localized corrosion of the tubing occurred in the acidic environment containing Cl-,H2S and CO2. The uniform corrosion occurred as a result of hydrogen evolution corrosion caused by the H2S-CO2-H2O (Cl-) system. The micro galvanic effect caused by the deposition of CaCO3 and the hydration of Fe2+ and Cl- in the formation water led to the localized corrosion and perforation of the tubing. It was suggested that P110-3Cr steel with certain sulfur resistance or steel with better corrosion resistance should be used for the oil well tubing materials, and corrosion and scale inhibitors should be added for protection.
中图分类号 TG172.3 DOI 10.11973/jxgccl202002016
所属栏目 失效分析
基金项目 国家自然科学基金资助项目（51774249）
收稿日期 2019/2/25
修改稿日期 2019/12/25
网络出版日期
作者单位点击查看
备注赵海洋(1974-),男,四川遂宁人,教授级高工,博士
引用该论文: ZHAO Haiyang,YE Fan,TANG Cheng,GUO Yujie,PENG Zhengde,ZENG Dezhi. Cause of Corrosion and Perforation of P110 Tubing in an Oil Well[J]. Materials for mechancial engineering, 2020, 44(2): 82～86
赵海洋,叶帆,汤晟,郭玉洁,彭政德,曾德智. 某油井P110油管腐蚀穿孔原因[J]. 机械工程材料, 2020, 44(2): 82～86
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【5】曾德智,邓文良,田刚,等. 温度对T95钢在H2S/CO2环境中腐蚀行为的影响[J]. 机械工程材料, 2016, 40(6):28-32.
【6】谈士海. 黄桥气田CO2腐蚀及选材评价研究[J]. 断块油气田, 2005, 12(6):83-85.
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【11】王霞,张仁勇,上官昌淮,等. 两种套管钢在含CO2模拟油田地层水中的腐蚀行为[J]. 机械工程材料, 2013, 37(5):69-72.
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【14】曾德智,王哲,商剑峰,等. 含H2S/CO2脱硫胺液中Cl-对20#钢腐蚀的影响[J]. 安全与环境学报, 2016, 16(6):129-133.
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