关键词: 超长距, 定向钻机, 采动裂隙, 瓦斯抽采

Abstract: Aiming at the problem of gas content overrun in fully-mechanized face of high gas seam group in Shaqu Coal Mine. On the basis of principle for roof borehole gas drainage drilling technology, combined with the German DDR-1200 kilometer and directional drilling machine and analysed the embodiment of gas drainage using directional drilling in the roof crack area. According to actual mining conditions of 14301 working face, established the reasonable parameters of drilling layers arrange and carried out the industrial test. The results showed that No.1 drilled hole which was located 22m above the 14301 working face roof and 15m from the haulage roadway in an inclined direction has achieved good gas drainage effect. The average extraction concentration reached 75% and over an extraction time of more than 120days which realized the simultaneous extraction of coal and gas and ensured the safety and high effective product of coal mine

Key words: super-long, directional drill, mining fracture, gas drainage