大西矿顺层瓦斯抽采钻孔封孔参数研究

Study on Drilling and Sealing Parameters of Gas Extraction in the Bedding of Daxi Coal Mine

为了提高大西矿3021工作面本煤层顺层钻孔的瓦斯抽采率,对影响顺层钻孔抽采效率的封孔长度和封孔深度两大因素进行了数值模拟分析。结合现场试验表明,钻孔封孔深度7.5m时煤层瓦斯含量减小幅度更大,且封孔长度为7m时相对于其他封孔长度,瓦斯抽采浓度更大。

In order to improve the gas extraction rate of the borehole along the seam in the working face 3021of Daxi Coal Mine,numerical simulation analysis was carried out based on two factors that affect the length of the sealing hole and the depth of the sealing hole.According to the field test,the gas content in the coal seam decreases more greatly at a depth of 7.5m,and the gas extraction concentration is higher at a length of 7m compared with other sealing lengths.