某注气井3Cr钢油管腐蚀原因
Corrosion Cause of 3Cr Steel Tubing in a Gas Injection Well
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。
注氮气驱
溶解氧腐蚀
缝隙腐蚀
3Cr steel tubing
nitrogen injection drive
dissolved oxygen corrosion
crevice corrosion
Abstract
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.
中图分类号 TG172.8 DOI 10.11973/jxgccl202212014
所属栏目 失效分析
基金项目 中石油基础研究和战略储备技术研究基金资助项目(2021DQ032022Z-24);中石油关键核心技术攻关项目(2020B-4020)
收稿日期 2021/8/20
修改稿日期 2022/9/23
网络出版日期
作者单位点击查看
备注吉楠(1988-),男,陕西榆林人,高级工程师,硕士
引用该论文: JI Nan,LI Changliang,SONG Wenwen,ZHAO Mifeng,LONG Yan,XIE Junfeng. Corrosion Cause of 3Cr Steel Tubing in a Gas Injection Well[J]. Materials for mechancial engineering, 2022, 46(12): 85～90
吉楠,李长亮,宋文文,赵密锋,龙岩,谢俊峰. 某注气井3Cr钢油管腐蚀原因[J]. 机械工程材料, 2022, 46(12): 85～90
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