气井用套管螺纹接头失效分析
Failure Analysis of Gas Well Casing Threaded Connection
摘 要
针对某气田开采井使用的N80钢级套管在下井后保压过程中出现的泄压事故, 通过对失效接头进行了宏观观察、管材力学性能和化学成分分析, 并对同批次未使用的套管接头进行了螺纹参数及外观检验, 综合现场施工情况对螺纹接头失效的原因进行了分析。结果表明: 产品存在缺陷和上扣扭矩过大是螺纹接头失效的原因, 并提出了保证气井用套管使用安全的建议。
套管
螺纹接头
缺陷
扭矩
gas well
casing
threaded connection
defect
torque
Abstract
N80 grade steel casing which used in gas wells failed after being run in well. The macroscopic observation and mechanical properties and chemical composition analysis of the failure joints were done. Thread parameters and appearance of the same batch unused casing connection were inspected. According to well site condition, it was known that failure reason of threaded connection was defects of connection and exceeded torque, and the safety proposal was provided at last.
中图分类号 TH162
所属栏目 质量控制与失效分析
基金项目
收稿日期 2012/5/24
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备注闫凯(1985-),男, 助理工程师, 硕士。
引用该论文: YAN Kai,SUN Jing,ZHANG Hong-bo,YANG Li-neng,LI Yu-kun. Failure Analysis of Gas Well Casing Threaded Connection[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2012, 48(9): 628～630
闫凯,孙晶,张鸿博,杨力能,李昱坤. 气井用套管螺纹接头失效分析[J]. 理化检验－物理分册, 2012, 48(9): 628～630
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参考文献
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【3】America Petroleum Institute. Specification for Threading, Gauging and Thread Inspection of Casing, Tubing and Line Pipe Threads[S].USA:API Specification 5B,2008:2-5.
【4】America Petroleum Institute. Specification for Casing and Tubing[S].USA:API Specification 5CT,2005:15-18.
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【2】张毅,李晶.苏53-78-50井套管失效分析[J].金属热处理, 2011,36(9):190-192.
【3】America Petroleum Institute. Specification for Threading, Gauging and Thread Inspection of Casing, Tubing and Line Pipe Threads[S].USA:API Specification 5B,2008:2-5.
【4】America Petroleum Institute. Specification for Casing and Tubing[S].USA:API Specification 5CT,2005:15-18.
【5】America Petroleum Institute. Recommended Practice for Care and Use of Casing and Tubing [S].USA:API RP 5C1,1999:7-16.
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