基于不同孔间距数值模拟的钻孔瓦斯抽采有效半径确定方法

Drainage Effective Radius Measurement Based on Numerical Simulation of Different Drilling Distance

为了测算本煤层顺层钻孔抽采有效半径,通过在实验室数值模拟和现场测试不同孔间距时瓦斯抽采效果,得出钻孔压力、瓦斯浓度与抽采有效半径之间的关系。实验表明：煤层透气性系数和抽采时间是决定抽采半径的主要因素;抽采负压与抽采时间协调一致非常重要;平煤八矿15#本煤层顺层钻孔最大孔间距为3~4 m。

In order to measure the effective drainage radius of mining-coal bed, the relationship between the drilling pressure, gas concentration and the effective radius is obtained through the numerical simulation and the field test of different drilling distance. The results shows that the draining time and permeabilities are the main factors which influencing the effective radius; the consistency between subpressure and drainage time is very important; the actual measured drainage radius of No.15 in PCG Mine 8 Inseam is 3-4 m.