千米定向钻机在大宁煤矿瓦斯抽采中的应用

Application of directional kilometer drilling machine in gas extraction in Daning Coal Mine

为了充分发挥千米定向钻机轨迹可控、过程可溯的特点,有效提高矿井瓦斯抽采钻孔施工效率和煤层瓦斯的抽采效果,以煤与瓦斯突出矿井大宁煤矿为例,先后在本煤层钻孔瓦斯抽采、煤层顶板穿层钻孔瓦斯抽采、岩层底板穿层钻孔瓦斯抽采等方面进行了VLD深孔千米定向钻机瓦斯抽采现场应用,实现了生产准备采区煤与瓦斯突出风险的有效管控、采煤工作面上隅角和采空区瓦斯的有效抽采、石门揭煤区和开拓煤巷煤层瓦斯的高效预抽,为安全、高效的采掘作业奠定了基础。同时针对开拓规划采区首采面布置过程中存在的诸多瓦斯治理问题,提出了千米定向钻机配合下的L形综掘工序和底抽巷穿层钻孔抽采的解决方案,有效提高了瓦斯抽采效率,降低了煤层残余瓦斯含量,保证了矿井的安全有序生产。

In order to give full play to the controllable track and traceable process of directional kilometer drilling machine, enhance the efficiency of gas extraction drilling and coal seam gas extraction effect, VLD deep hole directional kilometer drilling is applied in Daning Coal Mine, a coal and gas outburst mine, in the gas extraction of coal seam borehole, coal seam roof trans-seam borehole, strata floor trans-seam borehole. The coal and gas outburst hazard is under control in coal mining arrangement district, the upper-corner gas and goaf gas is effectively extracted, and the gas in cross-cut coal uncovering area and development roadway is efficiently pre-extracted, which has laid the foundation for safe and efficient mining. At the same time, aiming at the gas control problems in initial mining arrangement of development planning area, the L-shape comprehensive excavation process and gas extraction through trans-seam extraction in floor extraction roadway using the kilometer drilling machine. Through the above measures, the gas extraction efficiency is improved, the residual gas content in coal seam is reduced, and safe and orderly production in mines is guaranteed.