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<p>This paper investigates the corrosion failure mechanisms of L360 shale gas gathering pipelines in the C Gas Mine and proposes corresponding protective measures. Chemical composition analysis, mechanical property testing, and metallographic structure analysis confirm that the pipelines comply with the standard of GB/T 9711-2023. EDS and XRD tests reveal that corrosion pits are dominated by elements such as C, O, and Fe, with FeCO<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub> identified as the primary corrosion products. Electrochemical analysis indicates that the corrosion potential of the intact anticorrosion coating is 148.01&#xa0;mV higher than that of the damaged coating, while the corrosion current density is significantly lower than that of the damaged coating. CO<sub>2</sub> corrosion is the primary cause of external pipeline failure, and the damage to anticorrosive coatings accelerates this degradation process.</p>

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Failure Analysis and Experiment of Corrosion in Shale Gas Pipeline

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Pengcheng Li,
  • Dong Lin,
  • Chang Liu,
  • Chaolang Li,
  • Wenxin Pu

摘要

This paper investigates the corrosion failure mechanisms of L360 shale gas gathering pipelines in the C Gas Mine and proposes corresponding protective measures. Chemical composition analysis, mechanical property testing, and metallographic structure analysis confirm that the pipelines comply with the standard of GB/T 9711-2023. EDS and XRD tests reveal that corrosion pits are dominated by elements such as C, O, and Fe, with FeCO3 and Fe2O3 identified as the primary corrosion products. Electrochemical analysis indicates that the corrosion potential of the intact anticorrosion coating is 148.01 mV higher than that of the damaged coating, while the corrosion current density is significantly lower than that of the damaged coating. CO2 corrosion is the primary cause of external pipeline failure, and the damage to anticorrosive coatings accelerates this degradation process.