煤矿井下钻孔测斜原理及轨迹计算方法

Borehole Inclination Measuring Principle and Borehole Trajectory Calculation Method in Underground Coal Mine

论述了基于加速度计与磁强计测量钻孔倾斜角、工具面角和方位角的具体方法,推导了各姿态角解算公式,并对钻孔轨迹计算方法进行了分析与阐述。分析了影响测斜精度及轨迹计算的各种因素,提出消除仪器的器件误差及安装误差、降低外界磁干扰、校正子午线收敛角,既可以提高测斜仪的精度又可以提高钻孔轨迹精确度。

A method of measuring inclination angle, tool face angle and azimuth based on accelerometers and magnetometer is presented. Formulas for calculating posture angle are deduced. A calculation method of borehole trajectory is analyzed and presented. After various factor affecting measuring inclination accuracy and trajectory calculation are analyzed, some methods are proposed such as eliminating device error and installation error of instrument, reducing magnetic interference,and correcting meridian convergence angle, which can improve not only the precision of borehole inclinometer but also the precision of borehole trajectory.