摘要
为提高碎软、低渗、高瓦斯突出煤层瓦斯治理效果,在阳泉矿区新景公司保安区3#煤层3109工作面试验采用井下顺层长钻孔水力压裂增透技术。钻孔设计在煤层底板开孔,穿过底板然后沿煤层延伸。钻孔煤层孔段长度不低于300 m,主孔设计深度459 m。开孔倾角12°、开孔方位角4°。试验累计共注水1510 m^3,开泵注水时间达到50小时27分钟。顺层长钻孔水力压裂增大了抽采影响半径(本次试验影响范围达到半径58 m的区域),提高了瓦斯抽采浓度和瓦斯抽采量(本次试验日平均瓦斯抽采浓度保持在70%以上,日平均抽采纯瓦斯量在2415 m^3/d);采用顺煤层长钻孔水力压裂措施后,压裂注入的大部分清水留存于煤体内,使煤体湿润,在一定程度上减少采煤时工作面粉尘。
In order to improve gas control effect of soft, low permeability, high gas outburst coal seam, a test of hydraulicfracturing of underground bedding directional long drilling technology has been conducted at 3109 face, No.3 coal seam, BaoanArea, Xinjing Co., which accumulated a total of 1510 m3 of water injection, open pump water injection time Llp to 50 hours and 27minutes. Hydraulic fracturing of bedding directional long drilling increases the radius, concentration and quantity of the extractionand reduces the mining surface dust to a certain extent.
出处
《江西煤炭科技》
2017年第3期20-23,共4页
Jiangxi Coal Science & Technology
关键词
定向长钻孔
压裂
瓦斯抽采
增透效果
directional long drilling
fracturing
gas extraction
antireflection effect
