Application of High Position and Long Directional Drilling Technology for Gas Control in Goaf of Taoyuan Coal Mine

Abstract:

Aiming at the conundrum of goaf gas excess after working face mining, 3 long-distance coal seam roof large diameter directional borehole were constructed in 1029 working face of Taoyuan mine by using the directional drilling technology combined screw motor with MWD, the maximum hole depth is 531m and the cumulative footage 1701m(contains branch holes). Through the precise control of drilling trajectory, the borehole is extended along the crack zone of the coal seam roof, the gas in the goaf is effectively extracted after the coal seam mining. This paper summarizes a set of drilling construction methods of high position and long borehole in roof for gas control in the goaf to ensure the safe and efficient production of coal mines.

Key words:high position and directional drilling; goaf; gas control; trajectory control