顺层瓦斯抽采钻孔合理封孔深度研究

Bedding Gas Extraction Reasonable Drilling Hole Sealing Depth Research

合理的封孔深度既可以保证钻孔气密性,又可以节省材料。采用钻孔气体流量法和钻屑量法测定某矿巷道卸压带,实测范围为0~12 m。通过以上方法综合分析,确定合理封孔深度为15~17 m。在某矿工作面进行现场验证,布置钻孔的封孔深度分别对11 m、15 m、17 m和19 m进行抽采效果考察,经过现场实验表明：该封孔深度是合理的,可以保证瓦斯高效抽采。

Reasonable hole depth can guarantee the borehole gas tightness,and can save material. Using borehole gas flow method and method of drilling cuttings determination of mine roadway unloading zone,the measured range of 0 ~ 12 m. Through the above method comprehensive analysis,to determine the reasonable hole depth of 15 ~ 17 m. Decorate in the mine working face for on- site validation,the drilling hole sealing depth were respectively 11 m,15 m,17 m and 19 m investigates extraction,it show that the depth of sealing hole is reasonable,can guarantee the gas efficient extraction after field experiments.