Failure Detection of Drill String in Different Well Depths Based on Magnetic Memory
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摘要: 在井口处、中性点和井底附近极易发生钻具螺纹和管体断裂的事故，严重影响着油气资源的勘探开发进程。为解决此问题，将金属磁记忆检测技术应用于起钻过程中井口钻柱疲劳损伤状态的监测，并对塔里木油田ZG301井钻柱进行检测，着重研究钻柱接头处啮合螺纹磁记忆信号分析方法，建立井口钻柱接头处螺纹和管体的磁记忆信号随井深的变化关系，并对应力集中程度较严重的典型钻柱进行分析。结果表明，金属磁记忆检测技术能够早期检测钻柱的应力集中状况，能够避免钻井过程中带伤钻具的入井，对预防钻具疲劳断裂事故的发生具有重要意义。Abstract: Accidents of drilling thread and pipe fracture are easy to occur near the wellhead, the neutral point and the bottom hole,the exploration and development process of oil and gas resources was therefore seriously affected. To solve this problem, this article applied metal magnetic memory detection technology to monitor the drill string damage state during the drilling process, and the technology was put into practice in ZG301H well of Tarim Oilfield to conduct damage detection test. The analysis method of the magnetic memory signal in the thread joint of drill string is studied, the relationship between the magnetic memory signal of the thread and tube body with the well depth is established, and the typical drill string with larger stress concentration is analyzed. It can avoid injured drilling tools being brought into the well, and it is of great significance for preventing the occurrence of fatigue fracture.
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Keywords:
- different well depth /
- headwell drill string /
- stress concentration
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