定向钻进技术与装备在穿层定向长钻孔中的应用

Application of directional drilling technology and equipment in cross-bed directional long hole drilling

摘要:

针对硫磺沟煤矿工作面常规施工单孔深度不足、有效孔段短、钻进施工效率低、钻孔孔径小等诸多问题，提出采用窄体式ZDY4000LD（C）型履带钻机、第二代随钻测量系统（YHD2-1000（A）型）等附属定向设备进行穿层定向长钻孔成孔技术，以提高钻孔成孔精度、钻孔深度，增大钻孔孔径等参数，减小煤层因受采动影响，导致工作面瓦斯涌出量增大的问题。现场试验施工了4个大直径穿层定向长钻孔，孔深300 m以上钻孔成孔率达到100%，孔深最深399 m，最大钻孔孔径193 mm，钻进总进尺1581 m，平均孔深395.25 m，钻孔抽采效率显著增加。其中3号钻孔最大抽采混合流量8.3 m³/min，最大抽采纯量1.6 m³/min，瓦斯抽采浓度51%，瓦斯抽采效果显著。

Abstract:

In light of the problems such as insufficient single hole depth， short effective hole interval， low drilling efficiency， small drilling diameter， etc. with conventional drilling from the working face at Liuhuanggou Coal Mine， it was proposed to use the narrow compact ZDY4000LD （C） type crawler drill， and directional drilling tools and accessories such as the second generation MWD system （YHD2-1000 （A）） to drill cross-bed directional long holes so as to improve drilling accuracy， and increase hole depth and drilling diameter， while reduce increased working face gas emission problems due to coal mining. Four directional， large diameter， cross-bed long holes were field test-drilled with depth over 300m， hole completion rate up to 100%， the deepest depth of 399m， the largest diameter of ?193mm， the total drilling footage of 1581m， average depth of 395.25m， and significant increase in borehole gas extraction efficiency. Among them， the No.3 borehole provided the maximum extraction mixed flow rate of 8.3m³/min， the maximum extraction net volume 1.6m³/min， and the gas extraction concentration 51%， resulting in significant gas extraction effect.