Abstract Hydraulic fracturing combined with horizontal drilling has resulted in the rapid development of unconventional shale gas production during the last couple of decades. These shale gas fields have faced challenges in terms of bacterial control and pitting corrosion attacks. In the present work, laboratory and on-site corrosion tests were performed to investigate the corrosion behavior of two gathering pipelines in a shale gas field. General and pitting corrosion rates were determined via gravimetric analysis and surface profilometry, respectively. The surface morphologies of coupons and compositions of surface films were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results indicate an abundance of sulfate-reducing bacteria (SRB), with a concentration of over 104 cells/mL, was detected in the produced water collected from two gathering pipelines. Both laboratory and on-site corrosion tests revealed that the general corrosion rate was relatively low over a long testing period and decreased with the exposure time. A quantitative analysis of the general corrosion rate as a function of operating time for both pipelines was carried out based on the experimental and on-site corrosion tests. Pitting corrosion was a fundamental consideration and could pose a threat to the integrity of mild steel pipelines in a shale gas gathering system. Medium-to-serious pitting corrosion, with rates from 0.13 mm/y to 0.45 mm/y, was measured from 97 to 653 day's on-site samples. It is proposed that microbiologically influenced corrosion (MIC) associated with under-deposit corrosion was the predominant cause of pitting corrosion. In addition, chloride in the produced water promoted the pitting corrosion.

中文翻译：

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L360 N 和 L415 N 低碳钢在页岩气收集环境中的腐蚀行为——实验室和现场研究

摘要 近几十年来，水力压裂与水平钻井相结合，使非常规页岩气生产得到快速发展。这些页岩气田在细菌控制和点蚀攻击方面面临挑战。在目前的工作中，通过实验室和现场腐蚀试验来研究页岩气田两条集输管道的腐蚀行为。一般腐蚀速率和点蚀速率分别通过重量分析和表面轮廓测定法确定。通过扫描电子显微镜（SEM）和能谱仪（EDS）分析试样的表面形貌和表面膜的组成。结果表明硫酸盐还原菌 (SRB) 丰富，浓度超过 104 个细胞/mL，在从两条集输管道收集的采出水中检测到。实验室和现场腐蚀试验均表明，在较长的试验期内，总体腐蚀率相对较低，并随着暴露时间的延长而降低。基于实验和现场腐蚀测试，对作为两条管道运行时间函数的总体腐蚀速率进行了定量分析。点蚀是一个基本考虑因素，可能对页岩气收集系统中低碳钢管道的完整性构成威胁。从 97 天到 653 天的现场样品中测量了中度到严重的点蚀，腐蚀速率从 0.13 毫米/年到 0.45 毫米/年不等。有人提出，与沉积下腐蚀相关的微生物影响腐蚀 (MIC) 是点蚀的主要原因。