某注气井3Cr钢油管腐蚀原因  

Corrosion Cause of 3Cr Steel Tubing in a Gas Injection Well

作　　者：吉楠 李长亮[2] 宋文文[3] 赵密锋[3] 龙岩 谢俊峰[3] JI Nan;LI Changliang;SONG Wenwen;ZHAO Mifeng;LONG Yan;XIE Junfeng(State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials,Tubular Goods Research Institute of China National Petrolcum Corporation,Xi'an 710077,China;Daqing Petroleum Equipment Group,Daqing 163000,China;PetroChina Tarim Oilfield Company,Korla 841000,China)

机构地区：[1]中国石油集团石油管工程技术研究院,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,西安710077 [2]大庆油田装备制造集团,大庆163000 [3]中国石油天然气股份有限公司塔里木油田分公司,库尔勒841000

出　　处：《机械工程材料》2022年第12期85-90,97,共7页Materials For Mechanical Engineering

基　　金：中石油基础研究和战略储备技术研究基金资助项目(2021DQ03 2022Z-24);中石油关键核心技术攻关项目(2020B-4020)。

摘　　要：西部油田某注气井中3Cr钢油管出现腐蚀现象。通过宏观形貌分析、力学性能检测,扫描电镜、X射线能谱仪和X射线衍射分析等方法查找了油管腐蚀原因。结果表明:在注氮气驱件下,油管的内外壁主要发生溶解氧腐蚀,外螺纹端面发生溶解氧腐蚀与缝隙腐蚀;油管腐蚀主要是由于注入氮气中含有氧气而在油管内外壁和端面形成氧腐蚀环境,造成油管材料性能与实际服役的腐蚀环境不匹配。Corrosion was observed on the 3Cr steel tubing of a gas injected well in western oilfield. The corrosion causes of the tubing were analyzed by macroscopic inspection, mechanical property measurement, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. The results show that under the nitrogen injection drive condition, dissolved oxygen corrosion mainly occurred in the inner and outer walls of tubing, and dissolved oxygen corrosion and crevice corrosion mainly occurred in the pin end face of the tubing. The corrosion of tubing was caused by the mismatch between the tubing material properties and the corrosion environment in actual service, which was ascribed to the formation of oxygen corrosion environment in the inner and outer walls and end face of tubing due to the oxygen contained in the injected nitrogen.

关 键 词：3Cr油管 注氮气驱 溶解氧腐蚀 缝隙腐蚀 

分 类 号：TG172.8[金属学及工艺—金属表面处理]