水分对卧龙湖煤矿8^#煤层钻屑瓦斯解吸指标的影响研究

Impact of Moisture on Gas Desorption Index of Drill Cuttings of No.8 Coal Seam in Wolonghu Coal Mine

为了研究水分对钻屑瓦斯解吸指标的影响规律,通过实验室注水实验,记录并分析煤样在不同水分含量下的钻屑瓦斯解吸指标。结果表明:钻屑瓦斯解吸指标随着瓦斯吸附平衡压力的增大而增大,且与瓦斯压力呈幂函数关系;钻屑瓦斯解吸指标随着含水量的增加而降低,且水分初始增加时,对其影响较大;不同水分含量下的钻屑瓦斯解吸指标临界值不同,现场应用时需要考虑煤层的实际水分含量,从而提高突出预测准确率。

In order to study impact of moisture on gas desorption index of drill cuttings, through water injection experiment to record and analyze the gas desorption index of drill cuttings under different moisture content. The results show ： gas desorption index of drill cuttings increases with the growth of gas adsorption equilibrium pressure,and the relationship of them is power function; gas desorption index of drill cuttings decreases with the growth of moisture content, and it suffer greater influence at the beginning of moisture rising. The critical value of gas desorption index of drill cuttings is different with the condition of different moisture content, thus we should take actual moisture content of coal seams into account when we use it in the field, in which way can improve the accuracy of predicting.