A Correction Method for Attitude Measurement in Steerable Drilling System

ABSTRACT—In the attitude measurement of the steering drilling system, the axes of the sensor cannot be perfectly orthogonal, and the instrument coordinate system does not coincide with the geographic coordinate system initially, which leads to installation errors. At the same time, the measurement offsets and the inaccurate scale factor have a great impact on the accuracy of attitude angle calculation. To eliminate the above influence and improve the drilling accuracy, this method is based on the three-axis accelerometer and fluxgate to constitute the measurement system and establish the attitude correction model. This method includes measurement offsets and scale factor calculation, installation error correction matrix algorithm, and temperature compensation calculation. Experimental results show that the proposed method can effectively improve the attitude angle calculation accuracy by more than 2.6 ∼ 5.6 times, the error between inclination angle and tool face angle is less than 0.06°. The method effectively improves the attitude measurement accuracy of steering drilling tools and improves drilling efficiency. CCS CONCEPTS • Hardware • Power and energy • Energy generation and storage • Fuel-based energy