氯离子质量浓度对N80稠油管柱腐蚀机理研究  

Effect of Cl^(-) concentration on the corrosion mechanism for N80 tubing steel

作　　者：赵永刚 李欢 杨杰[1] 张禹 何岩峰[1] 雷云 彭浩平[1] ZHAO Yonggang;LI Huan;YANG Jie;ZHANG Yu;HE Yanfeng;LEI Yun;PENG Haoping(School of Petroleum and Natural Gas Engineering,Changzhou University,Changzhou 213164,China;China Petroleum International Exploration and Development Co.,Ltd.,Beijing 102206,China)

机构地区：[1]常州大学石油与天然气工程学院,江苏常州213164 [2]中国石油国际勘探开发有限公司,北京102206

出　　处：《常州大学学报（自然科学版）》2024年第2期19-30,共12页Journal of Changzhou University：Natural Science Edition

基　　金：中国石油常州大学创新联合体资助项目(2021DQ06);国家自然科学基金资助项目(52201064)。

摘　　要：使用高温高压哈氏合金反应釜模拟N80油管钢在采出液中的恶劣腐蚀环境,研究不同氯离子质量浓度(0,5000,10000,15000 mg/L)对采出液中N80油管钢的腐蚀行为及腐蚀机理的影响,利用宏观和微观手段相结合,对N80油管钢的腐蚀速率,腐蚀形貌和腐蚀产物膜结构进行分析,明确不同氯离子含量环境下其腐蚀的差异性。结果表明,在含有氯离子的对照组中,随着氯离子质量浓度提升腐蚀速率上升显著,腐蚀产物表面点蚀坑逐渐增大。这是由于氯离子破坏了原本致密的腐蚀产物膜,使碳钢再次暴露在腐蚀溶液中,加速点蚀的产生。This article used a high-temperature and high-pressure Hastelloy reactor to simulate the harsh corrosion environment.The effects of different Cl^(-) concentrations(0,5000,10000,15000 mg/L)on the corrosion mechanism of N80 tubing steel in the extraction fluid was studied.The corrosion rate,corrosion morphology and corrosion film structure of N80 tubing steel was analyzed using a combination of macroscopic and microscopic means.The variability of corrosion in different Cl^(-) content environments was clarified.The results showed that the corrosion rate rose significantly with the elevation of Cl^(-) concentration,and the pits on the surface of the corrosion products gradually increased.The large amount of Cl^(-) enrichment destroyed the originally dense corrosion film,exposing N80 tubing steel to the corrosion solution.The presence of trace O 2 made the concentration difference battery occur,accelerating the corrosion process.

关 键 词：氯离子质量浓度 N80油管钢 点蚀 腐蚀产物膜 

分 类 号：TE983[石油与天然气工程—石油机械设备]