Analysis of Corrosion Reasons of 825 Nickel-Based Alloy Hydraulic Control Pipe in a Thermal Recovery Well

FANG Jianbo; XUE Yan; MA Youlong; LUO Sheji; ZHOU Shili; ZHAO Guoxian; SONG Yang

doi:10.11973/fsyfh-202008013

Corrosion & Protection > 2020 > 41(8): 65-69. > DOI: 10.11973/fsyfh-202008013

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): 65-69. DOI: 10.11973/fsyfh-202008013

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Analysis of Corrosion Reasons of 825 Nickel-Based Alloy Hydraulic Control Pipe in a Thermal Recovery Well

1. Second Oil Production Plant of Sinopec Northwest Oilfield Branch, Luntai 841600, China;
2. Xi'an Maurer Petroleum Engineering Laboratory Co., Ltd., Xi'an 710065, China;
3. School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

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Received Date: December 12, 2018

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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.
- thermal recovery well,
- 825 nickel-based alloy,
- oxygen corrosion,
- sulfur corrosion

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[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.
[2]	蔡晓文,戈磊,于浩波,等. 镍基合金825在元素硫环境中的局部腐蚀特征[J]. 材料科学与工程学报,2010,28(2):227-250.

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Analysis of Corrosion Reasons of 825 Nickel-Based Alloy Hydraulic Control Pipe in a Thermal Recovery Well

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