彬长矿区顺层抽采定向钻孔与常规钻孔的间距对比

Comparison of Directional and Normal Drilling in Coal Seam in Binchang Mining Area

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 flow and gas desorption, the theoretical method of obtaining the gas pre-drainage radius of the bedding gas is studied, and obtained the radius when gas content of the coal seam is reduced more than 30%. The result is that the influence factors of the gas pre-drainage radius in the bedding include： drilling radius, pore pressure, coal seam characteristics and extraction time, and the last factor is most important.