某输气管道内腐蚀穿孔原因分析  

Causes of Corrosion Perforation in Gas Pipeline

作　　者：李轩鹏 李彦鹏 崔鹏[3] 胡斌[4] 付安庆 LI Xuanpeng;LI Yanpeng;CUI Peng;HU Bin;FU Anqing(State Key Laboratory of Oil and Gas Equipment,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;Shaanxi Jiuzhou Petroleum Engineering Technology Service Co.Ltd.,Xi′an,Shaanxi 710075,China;PetroChina Dagang Oilfield Company,Tianjin 300280,China;PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,油气钻采输送装备全国重点实验室,陕西西安710077 [2]陕西九州石油工程技术服务有限责任公司,陕西西安710075 [3]中国石油天然气股份有限公司大港油田分公司,天津300280 [4]中国石油塔里木油田公司,新疆库尔勒841000

出　　处：《石油管材与仪器》2025年第2期97-102,共6页Petroleum Tubular Goods & Instruments

基　　金：中国石油集团基础性前瞻性科技专项“石油工程基础材料、基础元器件研究”(编号:2023ZZ11)。

摘　　要：针对某天然气输送管道腐蚀穿孔失效问题,通过对失效样品进行理化性能试验,结合宏观形貌、微观形貌与能谱、物相成分等分析,确定了造成输气管道腐蚀失效的主要因素。结果表明,该管道发生的局部腐蚀与内穿孔部位主要集中在6点钟方向,金相组织与硬度测试结果均符合标准要求,而C含量低于GB/T 8163—2018标准值;通过微观形貌和腐蚀产物分析可知,生成的腐蚀产物膜疏松多孔,腐蚀产物主要为FeS与FeCO_(3),结合该失效管道输送的腐蚀介质成分分析,判断该管道发生内腐蚀穿孔失效主要是湿天然气中携带的H_(2)S和CO_(2)共同作用的结果。建议该类腐蚀工况中应使用抗CO_(2)和H_(2)S腐蚀的管道或添加缓蚀剂等措施减缓管道腐蚀。In order to ascertain the primary factors responsible for the corrosion and perforation of a natural gas pipeline,physical and chemical properties tests,in conjunction with the analysis of macroscopic morphology,microscopic morphology and energy spectra,and surface composition,is employed on failed samples.The results indicate that the local corrosion and internal perforation in the pipeline is primarily concentrated in the 6 o′clock direction.The metallographic and hardness test results are consistent with the standard requirements.However,the content of C is below the standard value of GB/T 8163—2018.Through the analysis of the micro-morphology and corrosion products,it can be observed that the generation of the corrosion product film is loose and porous,with the corrosion products primarily consisting of FeS and FeCO_(3).By additional consideration of the composition of the transported corrosive medium,it is conclude that the main factor contributing to the internal corrosion and perforation of the pipeline is the joint action of H_(2)S and CO_(2)carried by wet natural gas.In such circumstances,it is recommended that anti-corrosion materials against CO_(2)and H_(2)S be employed,or that adding corrosion inhibitors and other measures be implemented to mitigate the corrosion of the pipeline.

关 键 词：腐蚀失效 天然气管道 20#钢 CO_(2) H_(2)S 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]