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针对目前井下定位系统的现状和局限性,分析了井下地磁定位的3种关键技术,架构了一种基于地磁定位技术的井下定位导航平台。介绍了井下地磁场分布特点和基准建模数学方法,开展了唐山市冀东能源学校井下巷道磁场数据采集,内业处理和三维地磁场模型构建的仿真实验,建立了井下巷道小区域内地磁特征线的布设方法和三维建模的插分模型。实验表明:采用分段线性插值方法符合井下巷道磁场分布的收敛性,能在小区域内快速拟合,精度较高,可满足井下地磁定位的基准要求。
According to the current status and limitations of downhole positioning system, three key technologies of downhole geomagnetic localization are analyzed, and a downhole navigation platform based on geomagnetic localization technology is designed. The distribution characteristics of underground geomagnetic field and reference mathematical model are introduced. The magnetic field data acquisition, internal processing and three-dimensional geomagnetic model construction of underground tunnel in Jidong Energy School of Tangshan are carried out, and the geomagnetic characteristics in the small area of underground tunnel are established. Line layout method and three-dimensional modeling of the plug-in model. Experiments show that the piecewise linear interpolation method is in accordance with the convergence of the magnetic field distribution in underground tunnels and can be quickly fitted in a small area with high accuracy and can meet the reference requirements of downhole geomagnetic localization.