Drainage Effect Test of Directional Drilling Construction for Coal Seam Roof Sandstone Water Pre-drainage

Abstract:

Directional drilling technology in coal mine has lots of advantages such as precisely controlled drilling trajectory, long effective distance and one hole for multiple purposes. For the roof flood in Tangjiahui mine, pre-drainage was carried out with long directional borehole, by the drainage practice in the first coal mining face and the inspection by boring through seam, obvious drainage effect is presented, which provide safety guarantee for working face tunneling and actual mining.