A shale gas gathering and transportation pipeline in a good block in Sichuan Province started leaking after less than a year of operation. To investigate the causes of corrosion of the sulfate-reducing bacteria (SRB), optical microscopy, scanning electron microscopy, and X-ray diffraction were used to analyze the corrosion and perforation of the shale gas surface pipeline in conjunction with bacterial corrosion simulation experiments. The results showed that the pipeline material (L360N) conformed to the requirements of the American Petroleum Institute 5 L standard and that extracellular polymeric substances were present in the corrosion pits. The corrosion products mainly included FeCO₃, FeS, CaCO₃, MgCO₃, and Fe mineralization. At 40°C, the uniform corrosion rate of L360N in the simulation experiment was 0.234 mm/a, and the local corrosion rate was 0.458 mm/a. SRB, saprophytes, and iron bacteria were detected in the on-site water medium and corrosion products, indicating that the main causes of shale gas pipeline corrosion are bacterial and CO₂ corrosion.

中文翻译：

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页岩气地面管道腐蚀失效原因分析

四川省一个好区块的页岩气集输管道在运行不到一年后就开始泄漏。为探究硫酸盐还原菌（SRB）腐蚀的原因，结合细菌腐蚀模拟实验，采用光学显微镜、扫描电镜、X射线衍射等手段，对页岩气地表管道的腐蚀穿孔进行了分析。结果表明，管道材料（L360N）符合美国石油学会5L标准要求，腐蚀坑内存在胞外聚合物。腐蚀产物主要有FeCO ₃、FeS、CaCO ₃、MgCO ₃, 和 Fe 矿化。40℃时，模拟实验中L360N的均匀腐蚀速率为0.234 mm/a，局部腐蚀速率为0.458 mm/a。在现场水介质和腐蚀产物中检测到SRB、腐生菌和铁细菌，表明页岩气管道腐蚀的主要原因是细菌和CO ₂腐蚀。