迪那2凝析气田集输管线腐蚀机理与防护技术  

Corrosion Mechanism and Protection Technology of Gathering Line in Dina-2 Gas Condensate Field

作　　者：许爱华[1] 张靖[1] 院振刚[1] 崔兰德[1] 谢宽涯[1] 张鲲鹏[1] 李岩[1] 

机构地区：[1]中国石油塔里木油田公司,库尔勒841000

出　　处：《腐蚀与防护》2015年第11期1090-1095,1100,共7页Corrosion & Protection

基　　金：中国石油天然气集团公司产能建设项目(油勘字2007-120)

摘　　要：迪那2凝析气田在投产3个月后内部集输和处理厂集气装置陆续发生管线刺漏、管线壁厚减薄、阀门和设备腐蚀等问题。通过对现场腐蚀部位打开、测厚、观察和实验室分析,对生产工况取样和实验室模拟研究,表明支线来气造成主管线介质流态突变,在靠近支线一侧存在低速涡流区、且支线无缓蚀剂从而造成缓蚀剂保护膜断层,当介质流经低速涡流区时腐蚀性组分和水分聚集,形成酸性腐蚀环境,加上高温高压下CO2联合Cl-导致的局部腐蚀速率加剧,以及高流速下的冲刷腐蚀是造成迪那2区块内部集输管线腐蚀的主要原因。据此提出腐蚀对策,并建议对采集气管线材质提高防腐蚀等级,采用合金钢以解决腐蚀问题。Some pipelines of the gas gathering and processing in DINA-2 gas condensate field leaked out and burst, some pipe wall thinned, valves and equipment corroded within 3 months after the plant went into operation, such issues seriously affected the safety of gas production, hy opening the corrosion site, measuring the thickness, observing the corrosion morphology and making laboratory analysis, sampling of production conditions for laboratory simulation studies, the results showed that the main line extension to the gas caused mutations in the medium flow pattern, the presence of low-speed vortex region near the side branch and branch no corrosion inhibitor in the branch causewd protection film faults, when the medium flowed through the low-speed vortex area, corrosive components and water accumulated, the formation of acidic corrosive environment, coupled with the increase of localized corrosion rate at high temperature and pressure, and ioint erosion-corrosion of C1- and COz at high flow rates were the main reasons for gathering pipeline corrosion in Dina 2 blocks. Some corrosion countermeasures were suggested.

关 键 词：凝析气田 集输 刺漏 缓蚀剂 腐蚀 低速涡流 CFD流场模拟 

分 类 号：TG174.4[金属学及工艺—金属表面处理]