某页岩气田20钢污水管腐蚀失效原因分析  

Analysis of 20 Steel Sewage Pipe Corrosion Failure in a Shale Gas Field

作　　者：解辉 于超 花靖 蒋秀 米瑛 刘兰 胡梦琪 银熙炉 XIE Hui;YU Chao;HUA Jing;JIANG Xiu;MI Ying;LIU Lan;HU Mengqi;YIN Xilu(State Key Laboratory of Chemical Safety,Qingdao 266100,China;SINOPEC Research Institute of Safety Engineering Co.,Ltd.,Qingdao 266100,China;SINOPEC Jianghan Oilfield Company No.1 Gas Production Plant,Chongqing 404020,China)

机构地区：[1]化学品安全全国重点实验室,山东青岛266100 [2]中石化安全工程研究院有限公司,山东青岛266100 [3]中国石油化工股份有限公司江汉油田分公司采气一厂,重庆万州404020

出　　处：《材料保护》2025年第3期164-173,共10页Materials Protection

基　　金：中国石油化工股份有限公司科技攻关项目(A-382)。

摘　　要：为探究某页岩气田20钢污水管发生腐蚀穿孔失效的原因,采用扫描电镜(SEM)、能谱分析(EDS)和拉曼光谱仪(Raman)对某页岩气田污水管进行腐蚀形貌观察及腐蚀产物表征,并根据实际工况开展了腐蚀模拟试验,系统分析了20钢污水管发生腐蚀失效的原因。结果表明,污水中存在硫酸盐还原菌、腐生菌等细菌以及明显的结垢趋势,污水管表面腐蚀产物主要为Fe_(2)O_(3)、FeCO_(3)和FeOOH,膜层下点蚀坑内存在Cl、S等元素聚集;随着在污水中浸泡时间的延长,20钢的均匀腐蚀速率和最大点蚀速率呈现先下降后上升的趋势,点蚀深度在腐蚀后期快速增大;垢下腐蚀和细菌腐蚀是导致污水管发生腐蚀失效的主要因素。In order to investigate the causes of corrosion-induced perforation failure of 20 steel sewage pipes in a shale gas field,scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)and Raman spectroscopy were used to observe the corrosion morphology and characterize the corrosion products of the sewage pipes in a shale gas field.Corrosion simulation tests were conducted based on the actual operating conditions,and the causes of corrosion failure of the 20 steel sewage pipes were systematically analyzed.Results showed that there were sulfate-reducing bacteria(SRB),saprophytic bacteria(TGB)and other bacteria,and the sewage had a significant scaling tendency.The corrosion products on the sewage pipe surface were mainly Fe_(2)O_(3),FeCO_(3),and FeOOH,with Cl and S elements accumulated in the pits under the corrosion layer.As the immersion time in sewage increased,the uniform corrosion rate and the maximum pitting corrosion rate of the 20 steel initially decreased and then increased,with the pitting depth increasing rapidly in the later stage of corrosion.Under-scale corrosion and bacterial corrosion were identified as the main factors contributing to the corrosion failure of the sewage pipes.

关 键 词：20号钢 页岩气田 污水管 失效分析 

分 类 号：TG172[金属学及工艺—金属表面处理]