ABSTRACT
Logging while drilling (LWD) refers to a logging method for measuring formation parameters during oil drilling. Measurement while drilling (MWD) mainly measures drilling engineering parameters. The drilling method of the downhole drilling tool determines the measurement while drilling. At present, the downhole rotation status of the instrument is mostly judged by the azimuth sensor and fluxgate, but the cost is high, the space is large, and it needs to be returned to the factory for calibration regularly. This paper proposes a new measurement method, which uses the characteristics of the output voltage change caused by the angle change between the giant magnetoresistive sensor and the geomagnetic field, and changes the angle information with the geomagnetic field into a voltage signal for measurement to realize the judgment of the drilling method. Measurement greatly reduces measurement cost and space occupied. The feasibility of the measurement method has been verified through experiments, and a new measurement method is provided for real-time status determination of downhole instruments.
