Application of Hydro-hammer Drilling in a Coal Bed-Crossing Hole in Underground Coal Mine
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摘要: 以穿层钻孔方式进行松软煤层瓦斯预抽采极大地克服了松软煤层瓦斯治理难的问题,然而部分矿区煤层顶(底)板岩石坚硬,影响了钻孔施工效率。结合地质岩心钻探的优势,将液动潜孔锤与高强PDC钻头结合应用于煤矿井下穿层瓦斯抽采孔施工中。淮南潘一煤矿现场试验表明,该工艺方法较传统回转钻进方法,钻进效率提高了83%,钻头进尺寿命提高近5倍,具有良好的经济性能。采用清水为冲洗介质,无粉尘污染,噪声污染小,较为适合空间狭小的煤矿井下巷道施工。Abstract: The difficulties of gas control are greatly overcome by coal bed crossing drilling for in-advance extraction in soft coal seam.But the hard rocks in roof and floor in some parts of the coal mine influence the drilling efficiency.According to the superiorities of geological core drilling, the hydro hammer was combined with PDC bit in the construction of coal bed crossing gas drainage hole in underground coal mine.Through the field practice in Panyi coal mine, it is proved that the drilling efficiency is improved by 83%comparing with the traditional rotary drilling and the service life increases nearly 5 times.In addition, by using water for flushing medium, there is no dust pollution with small noise.This technology is suit-able for the construction in narrow space in mine roadway.
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Key words:
- hydro hammer /
- PDC bit /
- coal bed crossing-hole /
- drilling efficiency /
- bit service life /
- Panyi coal mine
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