低渗透气性煤层抽采钻孔瓦斯防控技术研究

Research on Gas Prevention and Control Technology for Drilling Holes in Low Permeability Coal Seam Extraction

超前钻孔是我国局部综合防突措施之一,它由于具有工艺简单、实用性强和防突效果好等优点而被广泛应用。煤是一种由煤体、裂隙和孔隙构成的组合体,显而易见,它应具有多孔介质的性质。而超前钻孔就是在所要控制的突出煤层中打入一定数量钻孔,煤层瓦斯通过渗透流动和扩散流动到超前钻孔中,从而减小所控制煤层的压力而达到防突的效果。

Advanced drilling is one of the comprehensive anti outburst measures in China,which is widely used due to its advantages of simple process,strong practicality,and good anti outburst effect.Coal is a combination of coal,fractures,and pores,and it is evident that it should possess the properties of a porous medium.And advanced drilling is to drill a certain number of holes into the protruding coal seam to be controlled,and the coal seam gas flows into the advanced drilling through infiltration and diffusion,thereby reducing the pressure of the controlled coal seam and achieving the effect of preventing outbursts.