Application of Gas Drainage Technology for High-position Borehole with Large Diameter in Extremely Thick Coal Seam Mining Area

Abstract:

For the problems of high gas emission and gas transfinite in upper corner and return air from 1303 working face of Guojiahe mine， by the analysis and calculation of the principles and parameters of gas drainage for high-position borehole and combined with the production conditions of working face, the gas drainage technologies for conventional high-position borehole and high-position borehole with large diameter were performed in practice. The practical results show that the latter is much better than the former and effectively solves the problems of the gas transfinite and improves the safe production conditions of the working face.

Key words:high-position borehole with large diameter; gas drainage; extremely thick coal seam