煤层瓦斯抽采半径测定技术现状分析

Analysis of coal seam gas extraction radius measurement technology

合理的抽采半径对矿井布设抽采钻孔进行预抽采有着重要意义,但目前瓦斯抽采半径确定技术没有具体规范及通用测定方法。本文对比分析了瓦斯压降法、瓦斯含量法、瓦斯流量法、气体示踪法等井下直接测定方法及现有的多指标、多方法综合测定煤层瓦斯抽采半径技术优缺点,结果表明,没有一种测试方法能够适用所有煤层条件,应结合不同煤层赋存情况,综合确定高效准确的抽采半径测定方法。

Reasonable extraction radius is of great significance for pre-extraction by reasonable arrangement of extraction boreholes in mines,but at present there is no specific specification and general measurement method for determination of gas extraction radius.In this paper,the downhole direct measurement methods such as gas pressure drop method,gas content method,gas flow method and gas tracer method were compared and analyzed.The results showed that no single test method was suitable for all coal seam conditions.It was concluded that an efficient and accurate extraction radius determination method should be comprehensively combined with the occurrence of different coal seams.