摘要
针对彬长矿区低透气性煤层、瓦斯抽采效率低的难题,研究了彬长矿区低渗透性、强冲击煤层水力割缝增透瓦斯预抽技术。通过分析超高压水射流特性,剖析了超高压水力割缝卸压增透原理,以彬长大佛寺煤矿为代表分析了彬长矿区高压水力割缝卸压增透效果,形成了适合彬长矿区的超高压水力割缝工艺。现场试验得出,孟村、小庄、胡家河和大佛寺煤矿割缝钻孔平均瓦斯浓度是普通钻孔的0.9~2.7倍,割缝钻孔平均瓦斯纯量是普通钻孔的2.18~4.36倍,水锁效应预计在5~7 d左右,而大佛寺、小庄、胡家河和大佛寺煤矿割缝后抽采衰减时间24~57 d左右。应用表明,采用超高压水力割缝增透技术对彬长矿区低渗透性煤层瓦斯增透具有良好的效果,明显改善煤层透气性,达到了快速卸压增透的目的,保障了安全生产。
Aiming at the problems of low permeability and low gas extraction efficiency of coal seam in Binchang mining area,the hydraulic cutting and permeability increasing gas pre-extraction technology in strong bursting coal seam was studied.By analyzing the characteristics of ultra-high pressure water jet and the principle of ultra-high pressure hydraulic cutting pressure relief and permeability enhancement,the effect of high pressure hydraulic cutting pressure relief and permeability enhancement in Dafosi Coal Mine of Binchang mining area is introduced,and the ultra-high pressure hydraulic cutting technology suitable for Binchang mining area is formed.Field tests in Mengcun,Xiaozhuang,Hujiahe and Dafosi Coal Mines show that the average gas concentration increases by 0.9~2.7 times,the average gas purity increases by 2.18~4.36 times,the water lock effect is expected to be about 5~7 days,and the gas extraction attenuation time is about 24~57 days.The application shows that the ultra-high pressure hydraulic cutting technology has a good effect on the permeability enhancement of coal seam in Binchang mining area,which can significantly improve the permeability of coal seam,achieve the purpose of rapid pressure relief and permeability enhancement,and ensure the safety of production.
作者
赵文革
陈跟马
唐洪
吴学明
ZHAO Wenge;CHEN Genma;TANG Hong;WU Xueming(Shaanxi Binchang Mining Group Co.,Ltd.,Xianyang 712000,China;Binchang Mining Area Disaster Comprehensive Control Engineering Research Center,Xianyang 713600,China)
出处
《陕西煤炭》
2021年第S01期1-5,12,共6页
Shaanxi Coal
关键词
彬长矿区
低透气性
超高压水力割缝
卸压增透
水锁效应
Binchang mining area
low permeability
ultra high pressure hydraulic cutting
pressure relief and permeability enhancement
water lock effect
