Cause of corrosion and perforation of tubing in a water injection well
摘 要
在某注水井油管起出井下管柱作业过程中发现其存在穿孔。采用宏观观察、化学成分分析、硬度测试、金相检验、力学性能测试、附着物分析、结垢预测及细菌检测、能谱分析、腐蚀模拟试验等方法,分析了油管穿孔的原因。结果表明:油管受到井下工况环境与注入水介质成分的影响,在其内壁形成并附着了CaCO3,BaSO4等垢层,形成了垢下腐蚀环境;在Cl-、还原菌的双重作用下,局部敏感区域的垢下腐蚀不断加剧,最终导致该油管发生了腐蚀穿孔。
Abstract
The perforations were found in tubing of a water injection well during tripping out the downhole string. The causes of tubing perforation were analyzed by macroscopic observation, chemical composition analysis, hardness test, metallographic examination, mechanical properties test, attachment analysis, scaling prediction and bacteria detection, energy spectrum analysis and corrosion simulation experiment. The results show that the tubing was affected by the downhole working environment and the composition of the injected water medium, and scale layers such as CaCO3 and BaSO4 were formed and attached to its inner wall, forming an under-deposit corrosion environment. Under the dual action of Cl- and sulfate-reducing bacteria, the under-deposit corrosion in local sensitive areas was continuously intensified, which led to in corrosion perforation of the tubing.
中图分类号 TG178 TG115.5 DOI 10.11973/lhjy-wl202209018
所属栏目 质量控制与失效分析
基金项目
收稿日期 2021/10/18
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备注陈钦伟(1982-),男,高级工程师,主要从事修井及井筒工艺相关研究工作
引用该论文: CHEN Qinwei,ZHANG Jigang,YANG Yang,YANG Zhongna,FENG Dianwen,LI Zhenkun. Cause of corrosion and perforation of tubing in a water injection well[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2022, 58(9): 66~70
陈钦伟,张继刚,杨阳,杨中娜,冯电稳,李振坤. 某注水井油管穿孔原因[J]. 理化检验-物理分册, 2022, 58(9): 66~70
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