Off-line measurement while drilling system for mine-used slewing drilling rig
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摘要: 针对矿用回转钻机打钻过程中无法直接测量孔底钻具姿态数据和绘制钻孔轨迹的问题，基于随钻测斜原理和离线式数据同步方法，开发了一种矿用回转钻机离线式随钻测斜系统。该系统由探管、同步仪和上位机软件组成。探管通过三轴加速度传感器和三轴磁阻传感器分别测量重力场和地磁场，以采集钻杆姿态；同步仪通过按键采集钻孔和钻杆编号，并根据钻杆姿态数据进行有效测点筛选；上位机软件通过测点递推算法绘制钻孔2D或3D轨迹图。功能测试结果表明：该系统测量的总地磁场矢量模长接近真实值50~60 μT，总重力加速度矢量模长接近1g，经传感器校正算法校正后的倾角最大偏差为1°，方位角最大偏差为5°。井下测试结果表明：对于已成钻孔，该系统绘制的钻孔轨迹与实际轨迹基本相同；对于钻进钻孔，孔口轨迹易受钻机本身的磁干扰而出现偏差，导致整条钻孔轨迹偏差较大，应保持钻机距离孔口3 m以上。Abstract: For inability to directly measure attitude data of drilling tool at hole bottom and draw drilling hole trajectory during drilling process of mine-used slewing drilling rig, an off-line measurement while drilling system for mine-used slewing drilling rig was developed based on measurement while drilling principle and off-line data synchronization method. The system is composed of probe tube, synchronizer and host computer software. Probe tube measures gravitational field and geomagnetic field separately through triaxial accelerometer and triaxial magnetometer, so as to acquire drilling rod attitude. Synchronizer acquires numbers of drilling hole and drilling rod through press keys, and selects valid measuring points according to drilling rod attitude data. Host computer software draws 2D or 3D trajectory through measuring point recursion algorithm. The functional test results show that mold height of total geomagnetic field vectors measured by the system is close to real value of 50-60 μT, mold height of total gravitational field vectors is close to 1g, and the maximum dip-angle error is 1° and the maximum azimuth-angle error is 5° after correction by sensor correction algorithm. The underground test results show that trajectory of read-made drilling hole drawn by the system is basically the same as actual trajectory, but hole-mouth trajectory of drilling role is easily affected by magnetic interference of drilling rig to generate error, which leads bigger error of the whole drilling hole trajectory, so drilling rig should be 3 m away from hole-mouth at least.
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期刊类型引用(9)
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