在水相渗流和瓦斯解吸理论的基础上,研究了获取顺层预抽钻孔抽采半径的理论方法,得出了瓦斯含量降低30%以上的顺层钻孔抽采半径。研究认为,顺层预抽钻孔抽采半径的影响因素包括:钻孔半径、孔内压力、煤层特性和抽采时间,决定定向钻孔和常规钻孔效益优劣的因素是抽采时间。 Based on the theory of water phase seepage and gas desorption, the theoretical method for obtaining the radius of coalbed gas drainage in prestaged pumping was studied, and the radius of coalbed drilling was obtained with the gas content reduced by more than 30%. According to the research, the influencing factors of the pre-pumping borehole radius include the radius of the borehole, the pressure in the borehole, the characteristics of the coal seam and the extraction time. The factor that determines the benefit of directional drilling and conventional drilling is the extraction time.