一种测斜仪安装位置误差补偿方法

A Compensation Method for Installation Position Error of Inclinometer

旋转导向钻井时,因测斜仪各轴与理想坐标系各轴不重合,引入位置误差,降低了测量精度.论文提出一种安装位置误差模型及补偿方法.首先,将传感器的3轴看成3个独立的空间轴,通过包含3个轴的理想正交坐标系的多次坐标变换,得到包含各自位置误差在内的旋转矩阵;然后,通过特殊位置点的测量值和理论值求得一个补偿矩阵;最后,将3轴的传感器测量结果解耦,实现对安装位置误差的校正.实验表明:该方法能较大幅度降低安装位置误差,提高测量精度.

In rotary steering drilling,the position error of the inclinometer leads to lower measuring accuracy,which is originated from the misalignment of each corresponding axis between inclinometer and ideal coordinate system.An error model of installation position and its compensation technique are presented in this paper.Firstly,three axes of the sensor were regarded as three separate spatial axes,and an ideal three-axis orthogonal coordinate system was rotated repeatedly.Then,a rotation matrix including its corresponding position errors was deduced,and a compensation matrix was achieved based on the measured values and the theoretical values at some special positions.Finally,the installation position error could be corrected by decoupling the measured results of the three-axis sensor.Experiments results show that it can reduce installation position error effectively and improve the measuring accuracy.