本煤层瓦斯抽采钻孔有效半径分布规律研究  

Study on Distribution Law of Effrctive Radius of In-Seam Gas Drainage Borehole

作　　者：李晓[1] 李见辉 李超[2] 李辉[2] 

机构地区：[1]平顶山天安煤业股份有限公司一矿,河南平顶山461700 [2]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《煤炭技术》2015年第1期252-254,共3页Coal Technology

摘　　要：为了研究本煤层瓦斯抽采钻孔周围有效半径的分布规律,运用钻孔周围煤层瓦斯流动的连续性方程、理想气体状态方程、气体运动方程和瓦斯含量方程,建立本煤层顺层钻孔周围瓦斯压力分布规律数学模型。在煤层施工瓦斯抽采钻孔,现场测定不同钻孔深度的抽采负压,分析孔深和抽采负压的数学关系。最后建立钻孔周围瓦斯压力沿孔深的变化关系式,研究瓦斯抽采钻孔周围有效抽采半径的分布规律。发现抽采负压随着孔深的增加呈线性递减,钻孔有效抽采半径随着孔深的增加也呈现出递减的趋势。In order to study the distribution law of the effective radius of coal seam gas drainage bore hole,establish mathematical model of gas pressure distribution around in-seam gas drainage borehole byseam gas continuity equation,ideal gas equation of state,gas equation of motion and the equation of gas content. Construct gas drainage borehole for coal seam,test drainage negative pressure at different drilling depth,build mathematical relationship between drainage borehole depth and drainage negative pressure.Build change relationship between gas pressure around borehole and borehole depth,study distribution law of effective drainage radius around gas drainage borehole. Find that drainage negative pressure decreasing linearly with hole depth increasing,effective drainage radius shows a decreasing trend with hole depth increasing.

关 键 词：本煤层 瓦斯抽采 抽采负压 有效抽采半径 分布规律 

分 类 号：TD712[矿业工程—矿井通风与安全]