穿层钻孔与顺层钻孔抽采半径差异性研究

发布时间：2018-01-19 22:33

本文关键词： 穿层钻孔顺层钻孔有效抽采半径 SF示踪法瓦斯抽采　出处：《河南理工大学学报(自然科学版)》2016年02期 　论文类型：期刊论文

【摘要】：为了研究两种钻孔有效抽采半径之间存在的差异,以朱集西煤矿11-2煤层为例,采用压力降低法测定了穿层钻孔的有效抽采半径,采用SF6气体示踪现场实测结合COMSOL软件模拟的方法测试了同一煤层顺层钻孔的有效抽采半径。现场测试结果表明,试验煤层在13 k Pa抽采负压、抽采90 d的条件下,穿层钻孔和顺层钻孔的有效抽采半径分别为4.5 m和7.8 m,穿层钻孔的有效抽采半径明显小于顺层钻孔的有效抽采半径,这对抽采设计中合理选择钻孔间距具有十分重要的意义。
[Abstract]:In order to study the difference of effective extraction radius between two kinds of boreholes, taking 11-2 coal seam of Zhujixi coal mine as an example, the effective extraction radius of perforating borehole was measured by pressure reduction method. Using the method of SF6 gas tracer field measurement and COMSOL software simulation, the effective extraction radius of the borehole in the same seam is measured. The field test results show that. Under the conditions of negative pressure extraction at 13 KPA and 90 days extraction, the effective extraction radius of the perforated borehole and the bedding borehole are 4.5 m and 7.8 m, respectively. The effective extraction radius of the perforated borehole is obviously smaller than the effective extraction radius of the bedding borehole, which is of great significance for the rational selection of the borehole spacing in the pumping design.
【作者单位】：河南理工大学安全科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室(省部共建国家重点实验室培育基地);
【基金】：国家自然科学基金资助项目(51174081) 河南省科技攻关项目(132300410119)
【分类号】：TD712.6
【正文快照】： *0引言瓦斯抽采作为区域瓦斯治理的关键技术,其作用是能够快速有效抽出采掘工作面的瓦斯[1]。为了尽快实现抽采达标,多数矿井往往采取井下穿层钻孔、顺层钻孔与地面定向钻长孔相结合的“立体式”抽采模式[2]。在这种模式下,确定不同抽采方式下的合理抽采参数及布置方式显得尤

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