International Journal of Earth Sciences and Engineering

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Coal-bed methane (CBM) Wells can be divided into vertical and horizontal well. The directional well is composed of vertical section and horizontal section. In the process of vertical section drilling, the drilling tool face angle is one of the most important parameters for the correction of borehole trajectory, however, the existing calculation method for tool face angle is too complicated and it is not the best suitable method for Measurement While Drilling (MWD) system which uses the Microprogrammed Control Unit (MCU) as the core. Based on this, it is deduced from this paper that two brand-new calculating formulas for tool face angle. According to the theoretical research and experiments, a kind of optimal combined algorithm for tool face angle is achieved. This optimal algorithm is suitable for MWD system with MCU as the core and can provide more accurate and efficient data support for real-time borehole trajectory correction.

Keywords

MWD, Tool Face Angle, Taylor Expansion, Triaxial Accelerometer, Optimal Algorithm.
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