In order to obtain the best drilling effect and technical and economic indicators, Water Well Drilling Tools must be selected reasonably. Improper selection can lead to premature wear of Water Well Drilling Tools and affect the service life of Water Well Drilling Tools. On the basis of a full understanding of the structure and working principle of Tools, starting from actual production, comprehensively considering the requirements for the use of Water Well Drilling Tools by drilling technology, formation conditions, drilling equipment and other factors, choose Water Well Drilling Tools reasonably.
The MWD directional drilling in underground coal mines is equipped with a bottom hole motor, which has a large drilling depth and also requires branch hole drilling. Therefore, the carcass type Water Well Drilling Tools should be selected for fast drilling speed, long life, and good tilting and stabilizing performance. Due to its strong abrasion resistance and excellent performance, the best applicable stratum is 1～ 8 (f≤10) level complete rock formations, some soft and hard interbeds and a few fractured formations can also be used normally.
In the selection of the diameter of Water Well Drilling Tools, full consideration should be given to making the drill tool assembly meet the requirements of Water Well Drilling Tools for stable drilling. The measurement while drilling directional drilling construction in underground coal mines usually adopts φ73mm center cable type drill pipe, and the diameter of the matching Water Well Drilling Tools is φ96mm. When drilling in soft coal seams, the matrix type Water Well Drilling Tools with low tooth density, narrow gauge width and back-drilling counter-cutting teeth should be selected; for hard coal and rock formations, tooth density should be selected The carcass-type Water Well Drilling Tools with medium and good gauge keeping effect.
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