长距离密闭取芯瓦斯含量测定方法研究

Study on Gas Content Determination Method of Coal Mine Closed Core

为提高煤层瓦斯含量测定准确性及增大测定范围,山西某矿引进了长距离密闭取芯装置,该装置可实现煤样钻取后孔内密闭,取样深度可达到300m以上,但尚未形成相匹配的瓦斯含量测定方法。通过采用理论分析、煤样高压吸附-解吸实验、瓦斯含量测定对比试验等方法,对长距离密闭取芯瓦斯含量测定过程、瓦斯损失量补偿模型等进行了研究,形成了长距离密闭取芯瓦斯含量测定方法。该方法所测煤层瓦斯含量比煤芯管测定结果平均高约5.23%,提高了煤层瓦斯含量测定精度,对促进煤矿瓦斯治理具有重要意义。

In order to improve the accuracy and expand the measuring range of coal seam gas content,Sihe Mine has introduced a long-distance sealed coring gas content measuring device,which can seal the hole after drilling coal samples,and the sampling depth can reach more than 300m,but no suitable gas content measuring method has been formed yet.Through theoretical analysis,coal sample high pressure adsorption and desorption experiment,gas content measurement and contrast engineering test,the gas content measurement process and loss compensation model of long-distance closed coring were studied,and the gas content measurement method of long-distance closed coring was formed.The gas content in coal seam measured by this method is about 4.71%higher than that measured by core tube on average,which improves the measurement accuracy of gas content in coal seam and is of great significance for promoting gas control in coal mine.