钻孔自然瓦斯流量衰减系数合理测定期的探讨

The Discussion on Reasonable Measured Period of Drilling Natural Gas Flow Attenuation Coefficient

基于钻孔自然瓦斯流量衰减理论,结合在山西晋城阳城矿区3#煤层钻孔自然瓦斯流量的现场实测数据,统计了1～65 d内不同时间段内测定的钻孔自然瓦斯流量数据,然后通过回归分析的方式对比了不同时间内的钻孔自然瓦斯流量衰减系数,进而根据曲线衰减的拟合度探讨测定钻孔自然瓦斯流量衰减系数α的最短有效时间。结果表明:在钻孔自然瓦斯流量较大的无烟煤层,其衰减系数的合理测定时间应为40 d左右。

Based on the drilling natural gas flow attenuation theory,combined with the field datum of drilling natural gas flow in Yangcheng mining area 3# coal seam of Shanxi Jincheng,the flow dadum of drilling natual gas flow measured during 1 ~ 65 d different time periods are counted,the attenuation coefficient during different time periods are compared through regression analysis,and then the shortest effective time of drilling natural gas flow attenuation coefficient α is measured and discussed according to the fitting degree of decay curve.The results show that the reasonable measured time of attenuation coefficient in anthracite layer with larger drilling natural gas flow should be 40 d.