Study and application on pressure releasing and permeability improved technology with digging and reaming out borehole

摘要：

　　To improve the gas drainage effect in low permeability coal, we introduced the pressure releasing and permeability improved technology with digging and reaming out the borehole in seam segment, combined with numerical simulation and field practice, study its mechanism of permeability and fluidity improvement.The results show that massive coal fragments were ejected after dig and ream out the borehole in seam segment, coal seam would expand deformed around the borehole, the crustal stress relieved, the quantity of fracture increased, and a substantial increase in permeability.The influence radius of gas drainage increased can be increased by 34.2 % ,the drainage gas concentration would be increased to 2 times, and the flow rate can be increased 4~6 times.

关键词： digging hole and reaming out borehole through strata permeability improvement numerical simulation

作者: LI Chun-ting

作者单位: School of Mining and Safety, Anhui University of Science and Technology, Huainan 232001, China

会议类型: 国际会议

会议名称: International Mining Conference 2014(2014国际采矿论坛)

会议地点: 安徽淮南

会议语种:英文

页码: 431-435

在线出版日期: 2014-09-19（万方平台首次上网日期，不代表论文的发表时间）