顶板高位定向钻孔在青龙煤矿瓦斯治理中的应用

Application of roof directional borehole in gas control in Qinglong Coal Mine

摘要:

顶板高位定向钻孔是进行上隅角瓦斯治理的关键技术措施。针对青龙煤矿顶板裂隙瓦斯治理需要及复杂顶板高位定向钻孔成孔难题，阐述了顶板高位定向钻孔的技术原理和技术优势；基于“三带”理论综合确定了高位定向钻孔的层位，并优化钻具组合和钻进工艺参数。在青龙煤矿11615工作面完成5个顶板高位定向钻孔的施工，最大孔深达到612 m，单孔最大瓦斯纯流量达到2.79 m3/min，瓦斯浓度达到23.4%，有效地保证了工作面的安全回采。

Abstract:

The high position directional borehole is a key technical measure for gas control in the upper corner. In view of the need for gas control of roof cracks in Qinglong Coal Mine and the difficulty in drilling high position directional boreholes in the complex roof, the technical principle and technical advantages of high position directional boreholes are expounded. Based on the theory of “three zones”, the horizons of high position directional boreholes are determined, and the drilling tool combination and drilling parameters are optimized. At the No. 11615 working face of Qinglong Coal Mine, five high position directional boreholes were completed in the roof with the maximum hole depth at 612m, the maximum gas flow rate of the single hole at 2.79m3/min, and the gas concentration up to 23.4%, which effectively ensured mining at the working face.