基于MEMS陀螺的高温随钻定向测斜仪研究

High temperature directional inclinometer while drilling based on MEMS gyro

针对油气井测量时所面临的小孔径、超深井、温度范围广、温度变化率高、工作时间长等挑战,研究了基于MEMS陀螺仪的定向测斜仪,设计了MEMS陀螺定向测斜仪软硬件系统.为确保该环境下的测量精度提出了一种动态温度补偿方案,并采用基于小波滤波多尺度分析的方法对动态温变环境下陀螺输出信号进行去噪滤波处理,以实现定向测斜仪系统的测量精度.论文给出了定向测斜仪硬件系统方案、定向测斜算法、小波多尺度滤波算法.测试结果表明:该系统在常温和动态温变环境下井斜方位角精度优于±2°,井斜角精度优于±0.1°,工作温度最高150℃,可适应我国深层油气井勘探开发的应用场景需求.

Aiming at the challenges of small diameter, ultra-deep well, wide temperature range, high temperature change rate and long working time in oil and gas well measurement, the directional inclinometer based on MEMS gyroscope is studied, and the software and hardware system of MEMS gyroscope directional inclinometer is designed. In order to ensure the measurement accuracy in this environment, a dynamic temperature compensation scheme is proposed, and the method based on wavelet filtering multi-scale analysis is used to denoise and filter the gyro output signal in the dynamic temperature change environment to achieve the measurement accuracy of the directional inclinometer system. The hardware system scheme of directional inclinometer, directional inclinometer algorithm and wavelet multi-scale filtering algorithm are given in this paper. Test results show that the deviation azimuth accuracy of the system is better than ±2° and the deviation angle accuracy is better than ±0.1° under normal temperature and dynamic temperature change environment and the maximum operating temperature is 150 ℃. All indexes are suitable for the working environment of small-diameter, ultra-deep and horizontal wells, and have broad application prospects.