理化检验-物理分册2017，Vol.53Issue(8)：585-589,5.DOI:10.11973/lhjy-wl201708011
钻柱转换接头断裂原因分析
Cause Analysis on Fracture of a Drill-Stem Sub
白强 1马健强 2韩新泉 2李德君 1刘强1
作者信息
- 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. 中石油煤层气有限责任公司,北京 100028
- 折叠
摘要
Abstract
Through means of macro and micro fracture analysis, metallographic examination, chemical composition analysis,mechanical property test and so on,combined with structure and working condition analysis, the fracture failure causes of the drill-stem sub in an oil well were analyzed.The results show that the failure mode of the drill-stem sub was fatigue fracture,and the lower bending strength ratio of the sub and serious stress concentration at the root of the internal threads were main causes for the early fatigue fracture of the drill-stem sub. The service life of the drill-stem sub could be effectively enhanced by measures such as optimizing of the structure to reduce the stress concentration of the thread root,improving the machining quality to reduce the surface roughness of the thread,improving the heat treatment process to achieve ideal microstructure and so on.关键词
钻柱转换接头/断裂/疲劳/应力集中/失效分析Key words
drill-stem sub/fracture/fatigue/stress concentration/failure analysis分类
能源科技引用本文复制引用
白强,马健强,韩新泉,李德君,刘强..钻柱转换接头断裂原因分析[J].理化检验-物理分册,2017,53(8):585-589,5.
