单一煤层顺层钻孔瓦斯抽采半径动态测定方法研究

摘要

In order to more conveniently determine coal seam gas drainage radius,under the hypothesis that gas drainage rule is basically consistent in the same geological unit,a method was proposed,using the superposition function relationship between gas drainage quantity from branch pipe and drilling amount in each section and the drainage time,to obtain the gas drainage radius of any gas content area in the geological unit,and realize the dynamic measurement.The method was applied in 3207 working face air return way of Xinyuan Company,the result was close to the pressure drop method result.%为了更加便捷的测定煤层瓦斯抽采半径,假设在同一地质单元瓦斯抽采规律基本一致的条件下,提出了抽采支管瓦斯抽采量与各区段钻孔钻尺量、抽采时间符合二次方程的叠加函数关系,求得地质单元内任意瓦斯含量区域的瓦斯抽采半径,实现瓦斯抽采半径的动态测定,该方法在新元公司3207工作面回风巷的测定结果与压降法测定抽采半径结果相近,效果良好.