某气田地面集输管线钢管腐蚀原因分析  

Analysis on Corrosion Causes of Steel Pipe of Gathering and Transportation Pipeline in a Gas Field

作　　者：吉楠 葛凯奇 童根 王鹏[4] JI Nan;GE Kaiqi;TONG Gen;WANG Peng(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,CNPC Tubular Goods Research Institute,Xi′an,Shaanxi 710077,China;CNPC Chuanqing Drilling Engineering Co.Ltd.,Chengdu,Sichuan 610056,China;PetroChina Tarim Oilfield Company,Korla,Xingjiang 841000,China;Oil and Gas Engineering Research Institute,PetroChina Tarim Oilfield Company,Korla,Xingjiang 841000,China)

机构地区：[1]中国石油集团工程材料研究院有限公司,石油管材及装备材料服役行为与结构安全国家重点实验室,陕西西安710077 [2]中国石油集团川庆钻探工程有限公司,四川成都610056 [3]中国石油塔里木油田公司,新疆库尔勒841000 [4]中国石油塔里木油田公司油气工程研究院,新疆库尔勒841000

出　　处：《石油管材与仪器》2023年第3期76-81,共6页Petroleum Tubular Goods & Instruments

基　　金：中石油集团公司关键核心技术攻关项目“提高页岩气井抗套损能力的新型套管研发”(编号:2020B-4020);中国石油天然气集团有限公司科学研究与技术开发项目“CCUS注采工艺、产出气循环利用及高效防腐关键技术研究”(编号:2021ZZ01-04)。

摘　　要：西部油田某地面集输管线二级节流后钢管服役1年后发现内壁发生了腐蚀。通过宏观分析、理化性能试验、扫描电镜、能谱分析和X射线物相分析等方法,同时根据服役工况,对钢管腐蚀原因进行了分析。结果表明,钢管材料的化学成分和拉伸性能试验结果符合API Spec 5L—2018标准的要求,内壁腐蚀产物主要由FeCO 3和CaCO 3组成。钢管内壁腐蚀主要为CO 2腐蚀,管内较高的服役温度和介质流速加速了腐蚀的发生。建议加注缓蚀剂或采用耐蚀合金材料钢管。Corrosion was found in the inner wall of the pipe after the secondary throttle of the surface gathering and transportation pipeline after one year operation.The corrosion reason was investigated through macroscopic analysis,physical and chemical performance tests,scanning electron microscope,energy dispersive spectrometer and X-ray diffraction,etc.combined with service condition analysis.The results show that the chemical composition and physical properties of the pipe were all in accordance with API Spec 5L—2018 standard requirements.The corrosion products were mainly composed of FeCO 3 and CaCO 3.Corrosion type of the inner wall was mainly CO 2 corrosion,and high temperature and medium flow rate significantly accelerated the corrosion process.It is recommended to inject corrosion inhibitor or use corrosion resistant alloy pipes.

关 键 词：集输管线 二氧化碳腐蚀 冲蚀 服役温度 

分 类 号：TE973[石油与天然气工程—石油机械设备]