煤与瓦斯突出煤层CO2相变致裂增透技术试验研究

摘要

针对车集煤矿煤层瓦斯压力较高、透气性差、瓦斯预抽难度大等问题,提出了在二2煤层进行CO2相变致裂增透技术试验.进行了CO2相变致裂技术原理和CO2致裂装置研究,设计了CO2相变致裂增透影响半径试验方案和CO2相变致裂增透瓦斯抽采效果试验方案.现场试验结果表明,本次CO2相变致裂增透试验的影响半径为4m;在观测的15 d内,致裂组的平均瓦斯抽采流量为普通抽采组平均瓦斯抽采流量的1.7倍.%According to the problems of the high gas pressure,the low permeability,the difficult gas pre-drainage at Cheji Coal Mine,the permeability increasing technique tests by CO2 phase transition fracturing were carried out in the Ⅱ2 coal seam.The technical principle of CO2 phase transition fracturing and CO2 phase transition fracturing device were studied,the influence radius testing programs and the gas extraction effect testing programs of CO2 phase transition fracturing technique were designed.The field tests showed that,the radius of influence of CO2 phase transition fracturing test was 4 m,and the average gas extraction flow of the fracturing group was 1.7 times that of the normal extraction group in 15 d.