旋转导向钻井系统中振动加速度的消除方法

Method of eliminating vibrational acceleration in rotary steerable drilling system

在钻井过程中,钻头切削岩层、钻柱与井壁的碰撞,必然造成钻井工具的振动,这些振动会在测斜加速度传感器的输出上得到反映,使其不能真实地反映井眼姿态的变化。为及时得到准确的井眼姿态,有必要研究振动条件下传感器的输出规律,进而消除振动的影响。从室内模拟振动实验的原始数据入手,通过Matlab对传感器输出信号进行功率谱密度估计,得出了振动频率与转速的大致关系,并设计了具有针对性的滤波器。通过对实验数据分析处理,振动干扰信号的能量得到大幅衰减,测斜传感器3个敏感轴的输出波动明显减小,提高了姿态测量的准确性,从而验证了该方法在旋转导向系统中是可行的。

In the actual drilling process, the effects of cutting formation drill, drill string and borehole face collisions will certainlycreate a drilling tool vibration. These vibrations in inclinometer acceleration sensor output are reflected, so that acceleration sensor outputvalue can not be true reflect borehole posture changes. In order to obtain accurate borehole attitude, it is necessary to study the sensoroutput during the vibration condition, so as to eliminate the effects of vibration. This paper begins with the raw data of the indoor simulationvibrational experiments, gets the general relationship between vibrational frequency and rotational speed through the power spectraldensity estimation of sensor output signal which is based on Matlab, and designs the specific filter. Through analyzing and processingthe experimental data, energy of vibration interference signal is greatly attenuated, output fluctuation of three sensitive axis inclinometersensor is significantly reduced, so the validation of the method is feasible in rotary steering system.