Study of drill measuring system based on MEMS accelerative and magnetoresistive sensor

It is very important for modern directional drilling systems to measure the attitude of drilling accurately. A Micro Electro-Mechanical System (MEMS) composed of a three-axis micro accelerometer and a three-axis micro magnetoresistive is designed. A carrier communication is used to transmit data acquired by sensors instead of the mode of traditional transmission. The theory and the algorithm of the coordinate transform are applied in the study of the attitudes, such as the azimuth, the inclination and the angle to tool face. Compared to conventional systems, the system minimizes labor costs, improves precision, and enhances the degree of automation. Experimental results verify that such a measuring system becomes more stable and reliable. And full scale can be performed attitude detection with a plusmn0.3 accuracy for angle to tool face, a plusmn0.1degaccuracy for inclination and a plusmn0. 2degaccuracy for azimuth.