低渗透性煤层CO_2相变致裂增透规律及应用
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摘要
针对轿子山煤矿M9煤层采掘过程中,煤层瓦斯含量高、压力大、抽采效率低、瓦斯治理周期长等问题,应用具有"增透"和"置换"双重效应的CO_2相变致裂增透技术,提高煤层透气性和瓦斯抽采效率。在轿子山煤矿9807运输巷进行CO_2相变致裂增透试验,重点考察不同致裂方式、不同布孔方式的致裂孔瓦斯抽采效果。结果表明:致裂孔抽采瓦斯纯流量是普通抽采孔的2. 0～2. 8倍,抽采瓦斯浓度提高1. 7～2. 4倍。在煤层赋存及钻孔条件相似的情况下,延时起爆(二次)致裂方式的钻孔有利于裂隙延展,增大裂隙范围;在致裂孔两边施工辅助孔时,为高压CO_2气体提供了自由面,减小了其向周边传播阻力,能够增大致裂孔影响范围,从而提高瓦斯抽采效率。
In the process of M9 coal seam mining in Jiaozishan Coal Mine,the high gas content,high pressure,low extraction efficiency and long gas treatment cycle have been put forward,the permeability and gas extraction efficiency of coal seam can be improved by applying CO_2 phase transition cracking technology with the dual effect of "increasing penetration" and "displacement". The CO_2 phase transition cracking test was carried out in 9807 transport lane of Jiaozishan Coal Mine,and the effect of gas extraction with different cracking mode and different way of distribution hole was emphatically investigated. The results show that compared with the pure flow rate of gas extraction,the cracking hole is 2. 0 times to 2. 8 times higher than that of the normal one,the gas extraction concentration is increased by 1. 7 times to 2. 4 times. Under the similar conditions of coal seam occurrence and drilling conditions,the drilling of delayed( two) cracking mode is beneficial to crack extension and increase the crack range; when the auxiliary holes are constructed on both sides of the cracking hole,it provides a free surface for high pressure CO_2 gas,reduces its propagation resistance to the periphery,and can increase the influence range of the cracking hole,thus improving gas extraction efficiency.
In the process of M9 coal seam mining in Jiaozishan Coal Mine,the high gas content,high pressure,low extraction efficiency and long gas treatment cycle have been put forward,the permeability and gas extraction efficiency of coal seam can be improved by applying CO_2 phase transition cracking technology with the dual effect of "increasing penetration" and "displacement". The CO_2 phase transition cracking test was carried out in 9807 transport lane of Jiaozishan Coal Mine,and the effect of gas extraction with different cracking mode and different way of distribution hole was emphatically investigated. The results show that compared with the pure flow rate of gas extraction,the cracking hole is 2. 0 times to 2. 8 times higher than that of the normal one,the gas extraction concentration is increased by 1. 7 times to 2. 4 times. Under the similar conditions of coal seam occurrence and drilling conditions,the drilling of delayed( two) cracking mode is beneficial to crack extension and increase the crack range; when the auxiliary holes are constructed on both sides of the cracking hole,it provides a free surface for high pressure CO_2 gas,reduces its propagation resistance to the periphery,and can increase the influence range of the cracking hole,thus improving gas extraction efficiency.
引文
[1]洪紫杰,王成,熊祖强.高瓦斯低透气性煤层CO2相变致裂增透技术研究[J].中国安全生产科学技术,2017,13(1):39-44.
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[10]石亮,殷卫锋,王滨.基于CO2爆破致裂透的瓦斯治理技术与实践[J].煤炭科学技术,2015,43(12):72-75.
[11]白志鹏.常村煤矿液态CO2循环爆破致裂增透技术研究[J].煤炭技术,2016,35(4):184-187.
[12]杜锋,王公达,蒋一峰,等.高压甲烷与二氧化碳吸附对煤体官能团特性的影响研究[J].矿业安全与环保,2015,42(5):1-4.
[13]齐黎明,赵嵘,梁为,等.不同流场条件下的煤样瓦斯解吸规律实验研究[J].矿业安全与环保,2016,43(2):5-8.
[2]衡献伟,李绍泉,李青松.贵州煤与瓦斯特征及影响因素研究[J].煤矿安全,2013,44(10):7-8.
[3]马帅,李绍泉,秦震东,等.贵州煤与瓦斯突出事故规律性研究[J].洁净煤技术,2011(6):89-91.
[4]衡献伟,张书金,韩真理,等.贵州煤矿区煤层突出危险程度评价技术及保护层选择[J].煤炭技术,2016,35(8):194-196.
[5]韩真理,张书金,衡献伟,等.贵州煤矿煤与瓦斯突出防治技术体系研究[J].煤矿安全,2017,48(11):9-12.
[6]王兆丰,孙小明,陆庭侃.液态CO2相变致裂强化瓦斯预抽试验研究[J].河南理工大学学报(自然科学版),2015,34(1):2-5.
[7]龚敏,黄毅华,王德胜,等.松软煤层深孔预裂爆破力学特性的数值分析[J].岩石力学与工程学报,2008,27(8):1674-1681.
[8]徐幼平,林柏泉,翟成,等.定向水力压裂裂隙扩展动态特征分析及其应用[J].中国安全科学学报,2011,21(7):104-110.
[9]胡国忠,许家林,王宏图,等.低渗透煤与瓦斯的固-气动态耦合模型及数值模拟[J].中国矿业大学学报,2011,40(1):1-6.
[10]石亮,殷卫锋,王滨.基于CO2爆破致裂透的瓦斯治理技术与实践[J].煤炭科学技术,2015,43(12):72-75.
[11]白志鹏.常村煤矿液态CO2循环爆破致裂增透技术研究[J].煤炭技术,2016,35(4):184-187.
[12]杜锋,王公达,蒋一峰,等.高压甲烷与二氧化碳吸附对煤体官能团特性的影响研究[J].矿业安全与环保,2015,42(5):1-4.
[13]齐黎明,赵嵘,梁为,等.不同流场条件下的煤样瓦斯解吸规律实验研究[J].矿业安全与环保,2016,43(2):5-8.
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