急倾斜低透煤层水力压裂瓦斯及水分富集特征  

Characteristic of gas/water distribution in steeply inclined low permeability coal seam induced by hydraulic fracture

作　　者：马衍坤[1,2] 刘泽功[1] 蔡峰[1] 

机构地区：[1]安徽理工大学煤矿安全高效开采省部共建教育部重点实验室,安徽淮南232001 [2]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,河南焦作454000

出　　处：《采矿与安全工程学报》2016年第6期1160-1164,共5页Journal of Mining & Safety Engineering

基　　金：中国博士后科学基金项目(2013M541815);国家自然科学基金项目(51404009);河南省瓦斯地质与瓦斯治理重点实验室开放基金项目(WS2013A02)

摘　　要：为研究急倾斜低透气煤层水力压裂后影响区域内的瓦斯及水分富集特征,开展了急倾斜煤层底板水力压裂工业性试验,实测分析了压裂影响区域不同位置处瓦斯含量与水分,得到了瓦斯及水分富集特征。结果表明,水力压裂对瓦斯与水分分布影响明显,急倾斜煤层的大倾角特征直接影响煤层瓦斯与水分的运移与富集;压裂影响区域内瓦斯富集与水分富集特征相反,水分较高区域瓦斯含量较低,而水分较低区域则富集了大量瓦斯;压裂影响区域内上部和下部水分富集较高,而中部由于放水较为充分因而水分较少,但该区域富集瓦斯含量最高;通过对不同区域瓦斯抽采效果分析,压裂孔周围30 m范围内瓦斯抽采效果最佳。In order to analyze the characteristic of gas/water distribution in steeply inclined low permeability coal seam induced by hydraulic fracture stimulation, the industrial experiment of hydraulic fracture was carried out in the steeply inclined coal seam floor, and actual measurement and analysis was done for the gas content and water at areas under different fracture effect. The characteristic of gas/water distribution was obtained. The results have shown that gas/water distribution was noticeably impacted by hydraulic fracture stimulation; the steep angle of steeply inclined coal seam impacted the gas/water migration and distribution; gas distribution and water distribution in the area affected by fracture effect had opposite characteristics： the area with high water content shows lower gas content while the area with low water content shows higher gas content; meanwhile, the upper part and lower part of the area under fracture effect showed higher water content and the central part showed highest gas content because water had been released adequately. The analysis of gas extraction from different areas showed the best drainage of gas lied in about 30 m around the hydraulic fracture site.

关 键 词：水力压裂 急倾斜煤层 瓦斯富集 水分富集 

分 类 号：TD713[矿业工程—矿井通风与安全]