关键词: 综放工作面, 采空区, 高位定向钻孔, 瓦斯抽采, 钻孔孔径, 抽采率

Abstract: In order to analyze the influence of design parameters of high directional drilling on the extraction effect of goaf, the layout parameters and extraction data of 53 high directional drilling in mine were compared by statistical method, the reasonable layout horizon and spacing of drilling were determined; taking 12311 as test working face, the pumping effect of high directional drilling under different negative pressure of pumping and borehole aperture is tested, the optimum negative pressure and reasonable bore diameter of high directional drilling are determined; the design of high level directional drilling and extraction parameters are optimized, and the extraction effect of optimized drilling field is tested and analyzed. The results show that the reasonable decorate horizon of high directional drilling extraction of 25 m ~ 45 m, horizontal distance is 20m~ 60 m, the best extraction negative pressure of 22.7 Kpa, the optimal pore size for 133 mm, the gas extraction rate increased by 15.5% after optimization, effectively reduce the return current gas concentration.