为研究顺层长钻孔抽采下煤层瓦斯残余含量的分布规律，基于负压衰减效应推导了长钻孔瓦斯抽采模型公式，利用COMSOL模拟软件建立了瓦斯−空气模型，分析了顺层长钻孔抽采下煤层瓦斯残余含量分布规律。结果表明：抽采负压呈现对数函数分布，孔底处负压最小，随着钻孔孔深增加，抽采负压衰减越小；由于钻孔存在抽采负压衰减现象，钻孔横向和纵向残余瓦斯含量呈现对数函数分布；在封孔段末端煤体受到封孔材料压力作用，使得煤体压实，孔隙率减小，瓦斯在附近运移更加困难，瓦斯流动阻力增大，致使封孔段末端瓦斯含量变化存在“滞后”现象；通过在贵州林华煤矿测量1^#、2^#钻孔不同孔深处煤层残余瓦斯含量，获得了取样深度与残余瓦斯含量的对数函数关系，拟合度分别为0.9430和0.9572，与理论分析结果相吻合。

In order to study the distribution law of gas residual content in coal seam under long borehole extraction, the formula of long borehole gas extraction model was deduced based on negative pressure attenuation effect. The gas-air model was established by COMSOL simulation software, and the distribution law of gas residual content in coal seam under long borehole extraction was analyzed. The results show that the extraction negative pressure presents a logarithmic function distribution, and the negative pressure at the bottom of the hole is the smallest. As the depth of the borehole increases, the attenuation of the extraction negative pressure is smaller. Due to the phenomenon of negative pressure attenuation in drilling, the horizontal and vertical residual gas content of drilling presents logarithmic function distribution. At the end of the sealing section, the coal body is subjected to the pressure of the sealing material, which makes the coal body compacted, the porosity decreases, the gas migration in the vicinity is more difficult, and the gas flow resistance increases, resulting in a “lag” phenomenon in the gas content change at the end of the sealing section. By measuring the residual gas content of coal seams at different depths of 1^# and 2^# boreholes in Linhua Coal Mine, Guizhou, the logarithmic function relationship between sampling depth and residual gas content was obtained. The fitting degrees are 0.943 0 and 0.957 2, respectively, which were consistent with the theoretical analysis results.