顺层瓦斯抽采钻孔封孔长度研究

发布时间：2018-05-12 13:57

本文选题：松动带 + 稳压测流量法　；参考：《煤炭科学技术》2017年09期

【摘要】：为确定顺层瓦斯抽采钻孔封孔长度,基于煤层内开挖巷道后巷道周围的应力分布情况,煤层渗透率与煤体所受应力的关系,以及流过煤体的气体流量与煤层渗透率变化规律,提出了"稳压测流量"法测定煤层巷道松动带的范围,分析了该方法在理论上的可行性,并依据该测定方法的原理,设计出了该测定方法的设备。在薛湖煤矿进行了现场试验,根据测定结果,发现随封孔位置的深入,注气稳定流量均呈衰减趋势,直至一定封孔深度,气体流量趋于稳定。在松动带范围内,气体的流量较大,虽有衰减,但衰减的幅度不大,均为21%~26%;松动带过渡地带,随着钻孔的深入,裂隙急剧减少,稳定流量急速衰减,衰减量为71%~82%,这两个区域裂隙较多,不适于封孔抽采,而在10.5 m以内,裂隙发育趋于稳定,达到最小值,可进行封孔抽采。依据测定现场进行了不同封孔距离下的抽采效果考察,发现依据测定的松动带范围封孔,能显著提高抽采浓度,增加钻孔寿命,解决封孔长度不科学造成的漏风问题。
[Abstract]:In order to determine the length of borehole sealing, based on the stress distribution around the roadway after excavation in coal seam, the relationship between coal seam permeability and the stress of coal body, and the variation law of gas flow through coal body and permeability of coal seam. This paper puts forward the range of "steady pressure measurement flow" method to determine the loose zone of coal seam roadway, analyzes the feasibility of this method in theory, and designs the equipment of the method according to the principle of the method. Field tests were carried out in Xue Hu Coal Mine. According to the results, it was found that the steady flow rate of gas injection decreased with the depth of sealing hole, and the gas flow rate tended to be stable until a certain sealing depth. In the range of loose zone, the gas flow rate is large, although there is attenuation, but the attenuation range is not large, all of them are 21 and 26. In the transition zone of loose zone, with the deepening of boreholes, the cracks decrease sharply, and the steady flow rapidly attenuates rapidly. The attenuation is 71 / 82. The two areas have many cracks and are not suitable for sealing hole extraction. However, within 10.5 m, the fracture development tends to be stable, reaching the minimum value, so that the sealing extraction can be carried out. According to the investigation of the extraction effect under different sealing distance, it is found that according to the range of loose zone, the extraction concentration can be increased significantly, the drilling life can be increased, and the air leakage caused by the unscientific length of the sealing hole can be solved.
【作者单位】：河南神火集团有限公司;中国矿业大学安全工程学院;
【基金】：江苏省自然科学基金资助项目(BK20150195)
【分类号】：TD712.6

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