沙曲矿掘进工作面钻屑瓦斯解吸指标超限浅析

Analysis on Over-Limit of Drilling Cuttings Gas Desorption Index in Shaqu Coal Mine Driving Face

通过分析沙曲矿掘进工作面瓦斯抽采钻孔设计、瓦斯抽采量、煤层地质条件等,得出个别钻孔段因穿岩、积水、夹矸造成局部抽采效果不良是钻屑解吸指标K1值超限的根本原因,采取了延长抽采时间,增设自动换水器、更换定向钻机等措施改善抽采效果,改善效果良好,未再出现钻屑解吸指标K1值超限情况。

By analyzing the gas drainage drilling design,gas drainage quantity and coal seam geological conditions of the mining face,it is concluded that the poor drainage effect of individual borehole due to passing through rock seam,water accumulation and coal-rock mixture created the root cause of the excessive depreciation of the K1,comprehensive measures were taken by extending the drainage time,introducing the automatic water changer,and the directional drilling machine to improve the drainage effect.After that,there is no more occurrence of over-limit of desorption index K1.