为掌握四棵树矿区八号井主采煤层抽采半径情况,采用钻孔瓦斯流量法考察研究了抽采时间与抽采纯流量之间的关系以及抽采时间与抽采半径之间的关系,通过理论计算得出不同抽采时间下B5煤层、B6煤层的有效抽采半径.研究结果表明:抽采纯流量随抽采时间的增长而呈现负指数规律减小,最终趋于稳定;瓦斯有效抽采半径与抽采时间呈正相关,但当抽采时间超过某个值,抽采半径将趋于稳定;B5煤层在平均抽采负压18 kPa的抽采条件下,抽采30、60、90、120 d对应的有效抽采半径分别为1.20、2.13、2.84、3.40 m;B6煤层在平均抽采负压13 kPa的抽采条件下,抽采30、60、90、120 d对应的有效抽采半径分别为 2.22、2.71、2.81、2.84 m.
Study on gas extraction radius of main coal seam in No.8 well of Sikeshu mining area
In order to grasp the extraction radius of the main coal seam in No.8 well of Sikeshu mining area,the borehole gas flow meth-od was used to investigate and study the relationship between extraction time and extraction pure flow rate,as well as the relationship between extraction time and extraction radius.The effective extraction radius of coal seam B5 and coal seam B6 at different extraction times were calculated theoretically.The research results indicated that the net flow rate of extraction decreases in a negative exponential pattern with the increase of extraction time,and eventually tended to stabilize.The effective gas extraction radius was positively correla-ted with the extraction time,but when the extraction time exceeded a certain value,the extraction radius tended to stabilize.Under the extraction conditions of an average negative pressure of 18 kPa,the effective extraction radius corresponding to 30,60,90 and 120 d of extraction in coal seam B5 were 1.20,2.13,2.84 and 3.40 m,respectively.Under the extraction conditions of an average negative pres-sure of 13 kPa,the effective extraction radius corresponding to 30,60,90 and 120 d of extraction in coal seam B6 were 2.22、2.71、2.81、2.84 m,respectively
gas extractionbedding boreholeeffective extraction radiusdrilling gas flow methodextraction time
万方数据
维普
