低透气性煤层瓦斯抽采钻孔布置优化研究  

goaf left-over coal spontaneous combustion spontaneous combustion“three zones”nitrogen injection

作　　者：李晓磊 Li Xiaolei(No.1 Colliery,Shanxi Huayang New Energy Co.,Ltd.,Yangquan,Shanxi 045000)

机构地区：[1]山西华阳集团新能股份有限公司一矿,山西阳泉045000

出　　处：《江西煤炭科技》2024年第4期160-163,共4页Jiangxi Coal Science & Technology

摘　　要：针对阳煤一矿煤层瓦斯预抽采效果不佳、抽采周期较长等问题,为进一步提高抽采效果,对群孔模式下高瓦斯低透气性煤层钻孔布置方式进行优化和探究。首先采用数值模拟方法,在群孔钻孔方式下分析各项参数包括抽采时间、钻孔孔径、钻孔间距、钻孔负压、煤层渗透率等因素对有效抽采半径的影响。然后研究群孔钻孔间相互作用对瓦斯运移造成的影响,并对群孔瓦斯钻孔的排列模式进行分析,综合对比菱形与矩形阵列排布瓦斯抽采效果。通过实践可以看出,钻孔菱形阵列排布瓦斯抽采效果要好于矩形阵列排布瓦斯抽采效果,同时在钻孔孔径为94 mm,孔距为2 m,透气性系数为0.2 m^(2)/(MPa^(2)·d),抽采负压为14 kPa的条件下,将群孔间距设在3 m时综合效果最佳。Aiming at the unsatisfied coal seam gas pre-drainage effect and long drainage period in No.1 Colliery of Shanxi Huayang New Energy Co.,Ltd.,the paper probes into the borehole layout optimization in high-gas low permeability under the mode of multiple holes,in which the influence of drainage time,borehole pore size,borehole spacing,borehole negative pressure and coal seam permeability on effective drainage diameter is analyzed through numerical simulation;and the study on the influence of boreholes interaction on gas movement shows that the drainage effect under diamond-array is superior to the rectangle-array layout and analysis of the borehole arrangement mode with the borehole pore size of 94mm,borehole spacing of 2 m,the permeability ratio of 0.2 m^(2)/(MPa^(2)·d),and the best drainage effect under 3-meter borehole spacing with the drainage negative pressure of 14 kPa.

关 键 词：煤层 低透气性 瓦斯抽采 群孔瓦斯钻孔布置 

分 类 号：TD712.62[矿业工程—矿井通风与安全]