期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Application of pressure relief and permeability increased by slotting a coal seam with a rotary type cutter working across rock layers 被引量:10
1
作者 Shen Chunming Lin Baiquan +2 位作者 Meng Fanwei Zhang Qizhi Zhai Cheng 《International Journal of Mining Science and Technology》 2012年第4期533-538,共6页
Pressure relief to increase permeability significantly improves gas extraction efficiency from coal seams. In this paper we report results from simulations using FLAC3D code to analyze changes in coal displace- ment a... Pressure relief to increase permeability significantly improves gas extraction efficiency from coal seams. In this paper we report results from simulations using FLAC3D code to analyze changes in coal displace- ment and stress after special drill slots were formed. We investigated the mechanism of pressure relief and permeability increase in a high-gas and low-permeability coal seam through the modeling of gas flow. This allows the development of the technology. Slotting across rock layers in the coal seam with a rotary type cutter was then applied in the field. The results show that pressure relief and permeability increases from slotting the coal seam can increase the transport and the fracture of the coal. This expands the range of pressure relief from the drilling and increases the exposed area of the seam. The total quan- tity of gas extracted from slotted bore holes was three times that seen with ordinary drilling. The concen- tration of gas extracted from the slotted drills was from two to three times that seen using ordinary drills. The gas flow was stable at 80%. Improved permeability and more efficient gas extraction are the result of the slotting. The roadway development rate is increased by 30-50% after gas drainage. This technology diminishes the lag between longwall production and roadway development and effectively prevents coal and gas outburst, which offers the Drosnect of broad anDlication. 展开更多
关键词 Penetrate layerSlottedPressure relief and permeability increasepermeabilitygas extraction
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部