基于地面磁信标的水平定向钻进实时定位方法

发布时间：2019-08-13 20:15

【摘要】：为提高非开挖水平定向钻进定位的精度和适用范围,提出一种基于地面永磁体信标的定位导向方法,在地面布置Φ50mm×300mm永磁体信标,永磁体轴线与水平面平行,利用钻具上安装的由5个三轴磁强计、1个三轴加速度计和1个三轴陀螺仪构成的传感器阵列测量磁信标在钻头附近的磁梯度张量解算钻头的位置.对该定位模型进行仿真实验表明该定位方法在深度和水平方向的定位精度均较高,理论上通过调整磁信标位置、永磁体数量、磁强计精度和基线长度在足够大的钻进深度和距离内保持定位误差小于1%,同时证明在有限钻具空间内基线相对越长,定位精度越高.实测实验表明环境干扰磁场对该方法的影响非常小,具有良好的实际效果.该定位方法满足非开挖水平定向钻进施工时的实时定位导向要求,操作简单,对场地条件要求低,大大提高了水平定向钻进定位的效率和适用范围.
[Abstract]:In order to improve the accuracy and applicable range of trenchless horizontal directional drilling positioning, a positioning and guiding method based on ground permanent magnet beacons is proposed. 桅 50mm 脳 300mm permanent magnet beacons are arranged on the ground. The permanent magnet axis is parallel to the horizontal plane, and five triaxial magnetometers installed on the drilling tools are used. A sensor array composed of a triaxial accelerometer and a triaxial gyroscope measures the position of the magnetic beacon near the bit by solving the magnetic gradient tensor. The simulation results of the positioning model show that the positioning accuracy of the positioning method is high in both depth and horizontal direction. Theoretically, by adjusting the position of magnetic beacons, the number of permanent magnets, the accuracy of magnetometer and the length of base line, the positioning error is less than 1% in a large enough drilling depth and distance. At the same time, it is proved that the longer the baseline is in the limited drilling tool space, the higher the positioning accuracy is. The experimental results show that the influence of environmental interference magnetic field on this method is very small and has a good practical effect. The positioning method meets the real-time positioning and guiding requirements of trenchless horizontal directional drilling construction, the operation is simple and the requirements for site conditions are low, which greatly improves the efficiency and applicable range of horizontal directional drilling positioning.
【作者单位】：中国地质大学工程学院;
【基金】：国土资源部公益行业基金项目(No.201011002-09)
【分类号】：P634

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