钻井作业过程中频发的钻柱断裂事故严重影响了油气资源的勘探开发进程.为了解决此问题,将金属磁记忆(MMM)检测技术应用于钻柱疲劳损伤的检测试验中.利用国内典型钻具材料(42CrMo)开展了模拟钻具典型工况的磁记忆检测拉伸疲劳试验,采集了不同循环次数对应试样表面的磁记忆信号值,并提取了磁记忆信号特征参量.进行了钻柱解体单根钻具螺纹损伤磁记忆检测试验以及钻井过程中啮合螺纹疲劳损伤监测试验.拉伸疲劳试验结果显示:磁记忆信号特征参量可以很好地诠释材料的拉伸疲劳过程,表征出不同疲劳阶段材料的应力集中程度.单根钻具螺纹损伤检测试验以及钻井过程中钻柱啮合螺纹疲劳损伤监测试验结果表明:磁记忆检测技术能够有效地检测出钻具螺纹应力集中程度以及分布情况.基于金属磁记忆的钻柱疲劳损伤早期监测方法为防止钻柱断裂事故的发生提供了安全有效的技术手段.%Drill string fracture frequently occurred during drilling operation seriously affected the exploration and development of oil and gas resources.To address the issue,the metal magnetic memory (MMM) detection technique was applied to the drill string fatigue damage detection test.The magnetic memory monitor tensile fatigue test of the typical working condition of the drilling tool has been conducted using the typical drill string material (42CrMo).The magnetic memory signal values of the sample surface corresponding to different cycle times have been collected,and the magnetic memory signal characteristic parameters have been extracted.The single drill pipe thread damage magnetic memory detecting test and the fatigue damage monitoring test on the engaged thread have been conducted.Tensile fatigue test results show that the magnetic memory signal characteristic parameters can be a good interpretation of the tensile fatigue process,and represent the stress concentration of the material at different fatigue stages.The single drill pipe thread damage magnetic memory detecting test and the fatigue damage monitoring test on the engaged thread shows that,the magnetic memory detection technique can effectively detect the stress concentration and distribution of the drill tool thread.The early inspection of drill string fatigue damage based on MMM provides a safe and effective technique for preventing the drill string from breaking.
展开▼
