Development of PDC Drill Bits for MWD Directional Drilling in Underground Coal Mine

Design of high quality PDC drill bits is necessary to perform MWD directional drilling for underground coal mine. Relatively deepened analysis was carried out here from the structural parameters to the type selection of cutting teeth of PDC drill bits. φ96 mm matrix-body PDC drill bit for directional drilling was developed followed by field tests, for which four branch holes were dilled. The average drilling speed was 4.12m/h and the total drilling footage was 1001.6m. The experimental results indicate that the deflecting effect as well as the service life of the developed drill bit can completely meet the application requirements.