Analysis of radius impact of coal seam gas drainage drill-hole in 13-1 coal seam of Kouzidong coal mine
In order to accurately determine the effective drainage radius of 13-1 coal seam gas in Kouzidong coal mine, we established the flow equation of pre-drainage gas from drill-holes, which was based on negative exponential decay laws of drilling gas flow and deduced the calculation formula of drill-hole spacing, selecting extraction rate as an indicator.By field measurement, the effective drainage radius was analyzed in different times.With the time of pre-pumping being prolonged,the effective radius of gas extraction drilling holes increased gradually, until the limit radius of extraction.According to a reasonable seam gas pre-pumping rate range of 20% ~40%, we know that the effective drainage radius of a drilling hole with a diameter of 94 mm is about 4.5~9.0 m.According to the actual status of gas drainage results in Kouzidong coal mine, the optimal distance between bores of drainage gas in coal seams is 7.5 m.This provides a reliable theoretical basis for drainage work in gas mines and has important implications for the protection of safe and efficient exploitation of the mine.
gas pressure drainage radius negative exponential decay
SONG Xiu-he CAI Li-yong MIAO Hong-hu
School of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong NSW 2522, Aust Kouzidong Coal Mine, State-own Xinji Energy Share Co., Ltd.,Fuyang 236153, China
国际会议
International Mining Conference 2014(2014国际采矿论坛)
安徽淮南
英文
376-380
2014-09-19（万方平台首次上网日期，不代表论文的发表时间）