Abstract Microbiologically influenced corrosion (MIC) and CO2 corrosion are the common types of corrosion in shale gas fields. In this study, the effect of quaternized polyacrylamide inhibitor on MIC was studied in the produced water from a shale gas field using a circulating loop system with CO2. The result shows that polyacrylamide can inhibit CO2 corrosion. However, in the presence of microorganisms, polyacrylamide failed to inhibit MIC. Microorganisms formed biofilm on the coupon surface. Pitting nucleated underneath the biofilm and developed into cavity-type due to the local acidification. According to crystal structure and chemical composition of matters in the biofilm, the mechanism of microbial acidification leading to pitting corrosion was proposed. The prevention and control strategy for MIC in CO2 environment was discussed.

中文翻译：

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含CO2和聚丙烯酰胺抑制剂的页岩气田采出水中碳钢管道微生物腐蚀

摘要 微生物腐蚀(MIC)和CO2腐蚀是页岩气田常见的腐蚀类型。在本研究中，使用 CO2 循环回路系统研究了页岩气田采出水中季铵化聚丙烯酰胺抑制剂对 MIC 的影响。结果表明聚丙烯酰胺可以抑制CO2腐蚀。然而，在微生物存在的情况下，聚丙烯酰胺不能抑制 MIC。微生物在试样表面形成生物膜。由于局部酸化，点蚀在生物膜下方成核并发展成空腔型。根据生物膜中物质的晶体结构和化学成分，提出微生物酸化导致点蚀的机理。讨论了CO2环境中MIC的防治策略。