小井斜重力工具面动态测量方法研究

Dynamic Measurement of Gravity Tool Face under Low-inclination

介绍了用重力加速度传感器测量重力工具面的原理,提出了一种提高精度和稳定性的小井斜重力工具面动态测量方法,搭建了基于石英加速度计的重力工具面动态测量系统,并针对现有自动垂直钻井系统在随钻状态下受到振动和冲击信号干扰测量精度下降和测量结果不稳定的问题,提出在常规硬件滤波的基础上,提高采样频率来反映信号原貌,加以多种数字信号处理方式以提高重力工具面动态测量精度。通过振动台的随机振动试验和井下实钻数据振动试验结果显示,测量精度和实时性均有提高。通过试验验证了该重力工具面测量方法和信号处理方式行之有效,可以为井下控制提供准确真实的实时执行导向依据。

In this paper, the principle to measure gravity tool face with gravity accelerometers is firstly de- scribed. A dynamic measurement of gravity tool face under low-inclination is presented to improve the precision and stability, and a dynamic measurement system is built with quartz accelerometers. As current automatic vertical drill- ing system can＇ t work precisely and steadily under vibration and impact while drilling, a solution is proposed based on conventional hardware filtering, which increases sampling frequency reflecting the origin signal and uses a variety of digital signal processing methods. The result of random vibration and down-hole drilling data experiments shows that the method is of high measuring precision and real-time capability. The approach to measure gravity tool face and the methods to process signals are verified by experiments, suggesting that it can offer accurate steering basis in real time for down-hole control.