常州大学学报（自然科学版）2025，Vol.37Issue(3)：50-58,9.DOI:10.3969/j.issn.2095-0411.2025.03.006
某海上油田L80油管在含CO2/H2S环境中腐蚀失效机理分析
Analysis of corrosion failure mechanism of L80 tubing in an offshore oilfield containing CO2/H2S environment
李阳 1杨中娜 2李希明 2杨阳 2安静 2徐振东3
作者信息
- 1. 中海华洋(天津)企业管理服务有限公司,天津 300457||中海油(天津)管道工程技术有限公司,天津 300452
- 2. 中海油(天津)管道工程技术有限公司,天津 300452
- 3. 中海石油(中国)有限公司天津分公司,天津 300459
- 折叠
摘要
Abstract
The root reason of L80 tubing corrosion perforation failure in an offshore filed was investiga-ted.On basis of the survey of operation history and macroscopic morphology inspection,chemical composition analysis,microstructure observation and hardness of failure tubing were evaluated.Scan-ning electrochemical microscopy(SEM),energy dispersive spectrometer(EDS)and X-ray diffrac-tometer(XRD)were used to analyse the corrosion morphology and corrosion products composition.Weight loss experiments were carried out in autoclave.The results show that corrosion products typi-cally have two layers of structure,which impacts tubing corrosion mechanism.The outer layer corro-sion products are FeCO3.However,the inner layer corrosion products are also with small amount of Fe3S4.The failure tubing has undergone CO2/H2S corrosion.The preferential damage characteristics is due to the inclination of the downhole tubing.The perforation failure of tubing is mainly caused by CO2 corrosion,and uniform corrosion is remarkably accelerated by presence of small amount of H2S.The deposited FeCO3 induces under deposit corrosion(UDC),which cooperates with the high concen-tration of chloride ions leading to localized corrosion.关键词
失效分析/油管/CO2腐蚀/H2S腐蚀/垢下腐蚀Key words
failure analysis/tubing/CO2 corrosion/H2S corrosion/under deposit corrosion分类
金属材料引用本文复制引用
李阳,杨中娜,李希明,杨阳,安静,徐振东..某海上油田L80油管在含CO2/H2S环境中腐蚀失效机理分析[J].常州大学学报（自然科学版）,2025,37(3):50-58,9.
