Analysis of Corrosion Reasons of 825 Nickel-Based Alloy Hydraulic Control Pipe in a Thermal Recovery Well
摘 要
某热采井825镍基合金液控管道在运行3个月后发生腐蚀失效。通过管材化学成分、力学性能和显微组织分析,腐蚀产物形貌与成分分析对失效管道的腐蚀原因及机理进行了研究。结果表明:825镍基合金液控管道外壁发生严重点蚀,腐蚀失效的原因是氧腐蚀和硫腐蚀,硫来源于井下H2S与注蒸汽中的O2反应生成。
Abstract
An 825 nickel-based alloy hydraulic control pipe of a thermal recovery well experienced corrosion failure after 3 months of operation. The corrosion reasons and mechanism of the failed pipe were studied by analyzing the chemical composition, mechanical properties and microstructure of the pipe and the morphology and composition of the corrosion products. The results show that the outer wall of the 825 nickel-based alloy hydraulic control pipe suffered severe pitting, the corrosion failure was caused by oxygen corrosion and sulfur corrosion, and sulfur was generated by the reaction of downhole H2S with O2 in steam injection.
中图分类号 TG172 DOI 10.11973/fsyfh-202008013
所属栏目 失效分析
基金项目
收稿日期 2018/12/13
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联系人作者薛艳(289542265@qq.com)
引用该论文: FANG Jianbo,XUE Yan,MA Youlong,LUO Sheji,ZHOU Shili,ZHAO Guoxian,SONG Yang. Analysis of Corrosion Reasons of 825 Nickel-Based Alloy Hydraulic Control Pipe in a Thermal Recovery Well[J]. Corrosion & Protection, 2020, 41(8): 65
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参考文献
【1】钱进森,陈长风,李晟伊,等. 镍基合金管材高温高压H2S/CO2环境中局部腐蚀研究[J]. 中国有色金属学报,2012,22(8):2214-2222.
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