Study on optimization of pressure-drop method for determine effective gas drainage radius in drill hole along coal seam
Gas extraction solution design and the investigation of the extraction effect in this coal seam is directly infuenced by effective gas drainage radius in drill hole alone coal seam.In this paper, to accurately measure the effective radius and identify the reasonable arrangement of extraction hole spacing, the arrangement of extraction holes in the traditional gas pressure measurement was improved appropriately.In the same height, unequal spacing of pressure observation holes and extraction holes were arranged separately, the effective radius was then determined by monitoring the gas pressure changes in different drill hole groups.The field test was practiced in Dingji coal mine.The test compared with the traditional gas pressure measurement method and the improved gas pressure measurement method, found the improved gas pressure measurement method has higher success rate and higher accuracy.
drill hole alone coal seam effective radius gas pressure
ZHOU Liang
School of Mining and Safety, Anhui University of Science and Technology, Huainan 232001, China
国际会议
International Mining Conference 2014(2014国际采矿论坛)
安徽淮南
英文
358-360
2014-09-19（万方平台首次上网日期，不代表论文的发表时间）