摘要
通过力学性能测试、显微组织和断口分析,并结合钻杆的受力状态,对φ127 mm G105钻杆管体刺穿失效原因进行分析。结果表明,钻杆失效原因是热处理工艺不当使得钻杆外表面形成0.35 mm的脱碳层,降低了其力学性能,在钻井过程中的交变应力作用下,表面机械损伤底部首先形成微裂纹并迅速扩展,最终导致钻杆发生早期疲劳失效。
Failure causes of φ127 mm G105 drilling pipe were investigated through mechanical property test,optical morphologies and fracture analysis with consideration of loading.Results show that the decarburized layer caused by improper heat treatment is the failure reason of the drilling pipe.Under the effect of alternating stresses,the cracks are first initiated in the position of mechanical damage and developed quickly.In the end,they lead the drilling pipe to early fatigue failure.
出处
《金属热处理》
CAS
CSCD
北大核心
2010年第11期99-102,共4页
Heat Treatment of Metals
基金
中国石油天然气集团公司科学研究与技术开发项目(2008D-2404)
关键词
钻杆
机械损伤
脱碳层
疲劳
drilling pipe
mechanical damage
decarburized layer
fatigue
