Experimental Study on Directional Long Hole Gas Drainage in Thick Coal Seam Roof

摘要

In order to study the application of roof directional drilling in thick coal seam gas control, and compare the input of roof directional drilling and roof high suction roadway, the roof directional long hole gas extraction test was carried out in Jincheng mining area. After the completion of the construction of the high-level long hole in the roof, the daily average net amount of gas drainage is stable at 17000m~3～20000m~3, and the cumulative net amount of gas drainage is about 2.8 million m~3. Compared with the roof high drainage roadway, the investment of roof directional long drilling to control the gas in the mining face can be reduced by 50%, the construction period can be shortened by 33%, and the manpower can be reduced by 30 people. Through the experimental data, the feasibility of the application of high and long drilling in thick coal seam is proved.