基于钻孔瓦斯流量和煤层瓦斯含量测定有效抽采半径
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摘要
为有效地测定瓦斯抽采半径,提出基于钻孔瓦斯流量和煤层瓦斯含量的煤层瓦斯抽采半径测定方法。根据钻孔瓦斯流量呈现负指数衰减规律,推导出有效抽采半径计算公式。以贺西煤矿3#煤层3316材料巷的两个抽采孔为测点,对瓦斯流量、浓度进行了60d连续监测。根据监测结果绘制出钻孔瓦斯抽采纯量衰减曲线,再在距离抽采孔不同位置处施工验证孔来测定煤层瓦斯含量,最后结合抽采指标计算出有效抽采半径。结果表明,3#煤层瓦斯预抽时间为90d时,抽采半径为5m。
In order to effectively measure the gas drainage radius,a determination method for coal seam gas drainage radius based on the borehole gas flow rate and coal seam gas content was proposed.According to the negative exponential attenuation law of gas flow in boreholes,calculation formula of the effective drainage radius was deduced.Taking two extraction holes in the 3316 material roadway of No.3 coal seam in Hexi Coal Mine as the measuring point,the gas flow and concentration were monitored continuously for 60 days.According to the monitoring results,the pure attenuation curve of borehole gas extraction was drawn,and then the coal seam gas content was measured by extraction holes at the different distances to determine the coal seam gas content,and the effective drainage radius was calculated with the extraction index.The results showed that when the No.3 coal seam gas pre-pumping time was 90 days and the drainage radius was 5 meters.
In order to effectively measure the gas drainage radius,a determination method for coal seam gas drainage radius based on the borehole gas flow rate and coal seam gas content was proposed.According to the negative exponential attenuation law of gas flow in boreholes,calculation formula of the effective drainage radius was deduced.Taking two extraction holes in the 3316 material roadway of No.3 coal seam in Hexi Coal Mine as the measuring point,the gas flow and concentration were monitored continuously for 60 days.According to the monitoring results,the pure attenuation curve of borehole gas extraction was drawn,and then the coal seam gas content was measured by extraction holes at the different distances to determine the coal seam gas content,and the effective drainage radius was calculated with the extraction index.The results showed that when the No.3 coal seam gas pre-pumping time was 90 days and the drainage radius was 5 meters.
引文
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