涡流式传感器在下部钻柱运动状态研究中的应用

介绍了涡流式传感器的工作原理,并设计制作了测试下部钻柱运动状态的涡流传感器。在自行设计建立的钻柱模拟实验来上做了直井中钻柱运动状态模拟试验,并用计算机采集和处理数据。试验得出了一些对理论研究和现场应用有价值的结论:1.涡流传感器可实现模拟钻柱横向运动的非接触测量;2同一钻柱组合,正反进动的断面都存在,但以正进动为主;3.下部钻柱存在运动位移连续点,而不存在应为连续点。指出反进动和应力不连续是钻仅及稳定器与螺纹失效的重要原因。

APPLICATION OF TURBULENT SENSOR IN STUDY OF MOVEMENT STATE OF LOWER PORTION OF DRILL STEM

The working mechanism of turbulent sensor waE described and turbulent sensors used for measurement of movement state of lower portion of drill stem were designed and made. A series of simulating tests of movement of drill stem in a vertical wellbore was conducted on a testing rack. The test data were collected and treated by a computer. The following valuable conclusions were obtained: l. Non-contacting measuremcnts of simulat ed lateral movement of drill string can be realized by use of turbulent sensor; 2. The both clockwise and counterclockwise movement sections are present on a same drill string, but the clockwise is the more frequent; 3. There is a continuous point of the movement displacement but not of the stresses. The counterclockwise movement and the discontinuity of stresses are the important reasons of the failure of drill collars, centralizers and threads.