基于钻孔应力分析的水力割缝增透技术研究
|
摘要
在分析瓦斯抽放钻孔周围应力分布的基础上,揭示了影响钻孔瓦斯抽放效率低的"瓶塞"效应,提出采用水力割缝技术破坏钻孔"瓶塞"效益,在煤体应力和流变作用下,钻孔周围煤体裂隙大量发育,为瓦斯流向自由空间提供通道,大大提高了煤层的瓦斯抽采效率。将该技术应用于某矿311306工作面本煤层瓦斯抽放,取得了良好的应用效果。
Based on the analysis of the stress distribution around the gas drainage borehole, the "bottle"effect which affects the efficiency of the gas drainage of the borehole is revealed. It is proposed to use the hydraulic slitting technique to destroy the"bottle"effect. Under the rheological action, a large number of coal body fissures develop, providing a channel for the gas flow to the free space, greatly improving the gas drainage efficiency of the coal seam. The technology was applied to the gas drainage of the coal seam in the 311306 working face of a mine,and achieved good application results.
Based on the analysis of the stress distribution around the gas drainage borehole, the "bottle"effect which affects the efficiency of the gas drainage of the borehole is revealed. It is proposed to use the hydraulic slitting technique to destroy the"bottle"effect. Under the rheological action, a large number of coal body fissures develop, providing a channel for the gas flow to the free space, greatly improving the gas drainage efficiency of the coal seam. The technology was applied to the gas drainage of the coal seam in the 311306 working face of a mine,and achieved good application results.
引文
[1]程远平,刘洪永,赵伟.我国煤与瓦斯突出事故现状及防治对策[J].煤炭科学技术, 2014, 42(6):15-18.
[2]高磊.煤层瓦斯抽放防突机理探析[J].能源与节能, 2018(1):136-137.
[3]林柏泉,张其智,沈春明,等.钻孔割缝网络化增透机制及其在底板穿层钻孔瓦斯抽采中的应用[J].煤炭学报,2012, 37(9):1425-1430.
[4]黄春明,代志旭,郭明功.高压水射流割缝增强瓦斯抽采及防喷孔技术研究[J].煤炭科学技术, 2015, 43(4):63-66,109.
[5]易灿,李根生,陈真.基于神经网络的高压水射流冲蚀破碎预测模型的研究[J].石油钻探技术, 2005, 33(3):6-8.
[2]高磊.煤层瓦斯抽放防突机理探析[J].能源与节能, 2018(1):136-137.
[3]林柏泉,张其智,沈春明,等.钻孔割缝网络化增透机制及其在底板穿层钻孔瓦斯抽采中的应用[J].煤炭学报,2012, 37(9):1425-1430.
[4]黄春明,代志旭,郭明功.高压水射流割缝增强瓦斯抽采及防喷孔技术研究[J].煤炭科学技术, 2015, 43(4):63-66,109.
[5]易灿,李根生,陈真.基于神经网络的高压水射流冲蚀破碎预测模型的研究[J].石油钻探技术, 2005, 33(3):6-8.