摘要
为确定高瓦斯矿井煤层顺层钻孔瓦斯抽采合理布孔间距,采用钻孔瓦斯流量法现场试验研究了钻孔有效抽采半径,根据测定钻孔瓦斯抽采纯量与抽采时间的关系,结合煤层瓦斯赋存情况和钻孔有效长度,分析了不同抽采率下不同抽采天数的有效抽采半径。研究结果表明:(1)测定钻孔的抽采半径都随着抽采时间的增加而逐渐增大,但增大的趋势逐渐减小,并最终趋于极限值;(2)抽采率从30%,按等值10%增加到60%,在相同的抽采时间条件下,有效抽采半径随着抽采率的增加,呈先大幅度减小后再小幅度减小趋势。该研究确定了顺层钻孔瓦斯抽采合理布孔间距,提高了瓦斯抽采效率。
In order to determine the reasonable spacing of boreholes for gas extraction in coal seam of high gas mine,the effective extraction radius of boreholes was studied by field test of borehole gas flow method.According to the relationship between the pure amount of gas extraction and extraction time,combined with the occurrence of coal seam gas and the effective length of boreholes,the effective extraction radius of different extraction days under different extraction rates was analyzed,and the reasonable spacing of boreholes for gas extraction in bedding boreholes was determined,which effectively improved the efficiency of gas extraction.The results show that:①The extraction radius of the measured boreholes gradually increases with the increase of extraction time,but the increasing trend gradually decreases and eventually tends to the limit value;②The extraction rate increases from 30%to 60%according to the equivalent 10%.Under the same extraction time,the effective extraction radius first decreases greatly and then decreases slightly with the increase of extraction rate.
作者
冯吉成
吉志海
闻志雄
牛格轩
董朝阳
高延琪
Feng Jicheng;Ji Zhihai;Wen Zhixiong;Niu Gexuan;Dong Chaoyang;Gao Yanqi(School of Mine Safety,North China Institute of Science and Technology,Langfang 065201,China)
出处
《煤炭与化工》
2025年第7期98-102,共5页
Coal and Chemical Industry
基金
国家自然科学基金项目(52174111)。
关键词
顺层钻孔
合理布孔间距
有效抽采半径
抽采时间
钻孔瓦斯流量法
抽采率
bedding drilling
reasonable hole spacing
effective extraction radius
extraction time
borehole gas flow method
extraction rate
