The main function of the inclinometer while drilling is to complete the measurement of inclination angle, azimuth angle, tool face angle and other parameters.
At present, accelerometers and magnetometers are used in the domestic directional drilling process. However, because magnetometers are susceptible to electromagnetic interference caused by various factors, expensive non-magnetic collars need to be installed to improve accuracy. Fiber optic gyroscope is considered to be a substitute for magnetometer to measure downhole, which can significantly improve measurement accuracy. Moreover, the use of strapdown inertial navigation method to calculate attitude and velocity can achieve real-time measurement that magnetic sensors cannot achieve, that is, logging while drilling, which can complete the measurement of parameters including inclination angle, azimuth angle, and tool face angle. The instrument uses a fiber optic gyroscope as the sensor, and the measurement is not affected by the magnetic field. In addition to completing the measurement of conventional wells, it can also achieve high-precision measurement of casing wells and magnetic material disturbing well conditions. The core hardware components of the fiber optic gyroscope while drilling inclinometer are two sensors: fiber optic gyroscope and accelerometer. The focus of the system software is attitude calculation. This part combines the Kalman filter algorithm to process the output discrete linear data of the gyroscope and accelerometer, and then conducts the design and simulation verification of the attitude calculation algorithm, and analyzes and analyzes the error source of the system. Compensation, and finally the upper computer software is designed to display the solution results and draw in real time.
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