High temperature directional inclinometer while drilling based on MEMS gyro
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.
Directional inclinometerDynamic temperature change environmentMEMS gyroscopeZero offset compensation
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