高压电脉冲放电煤层增透研究
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摘要
针对现有煤层气开发和煤矿安全开采中瓦斯抽采率低的问题,给出了一种水中高压脉冲放电的煤层气增透方法。首先分析了脉冲放电过程中液电效应及产生水激波机理;然后研究了水激波作用下的煤层产生裂纹位移及裂纹扩展规律;最后搭建了1套高压脉冲放电煤层增透试验测试系统,并进行了相关煤层增透试验。试验结果表明,该方法能改变煤层孔隙和裂隙结构,提高煤层瓦斯增透效果,在煤层增透方面具有一定的可行性和优越性。
For the issue of low gas drainage rate in coalbed gas development and mine safety production, a method of coal seam permeability improvement with high-pressure pulse discharge in water was proposed. First, the electrohydraulic effect and mechanism of water-shock wave in electric pulse discharge process were analyzed. Then, the mechanisms of coal seam cracks and crack propagation were studied. Finally, a set of experimental system with high-pressure pulse discharge was built, and the coal seam permeability improvement test of high-pressure pulse discharge was carried out. The experimental results show that method can effectively change the pore and fracture structure of coal seam, and can improve the coal seam gas permeability, and has certain feasibility and superiority in seam permeability improvement.
For the issue of low gas drainage rate in coalbed gas development and mine safety production, a method of coal seam permeability improvement with high-pressure pulse discharge in water was proposed. First, the electrohydraulic effect and mechanism of water-shock wave in electric pulse discharge process were analyzed. Then, the mechanisms of coal seam cracks and crack propagation were studied. Finally, a set of experimental system with high-pressure pulse discharge was built, and the coal seam permeability improvement test of high-pressure pulse discharge was carried out. The experimental results show that method can effectively change the pore and fracture structure of coal seam, and can improve the coal seam gas permeability, and has certain feasibility and superiority in seam permeability improvement.
引文
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[2]吴晋军,武进壮,周培尧,等.多脉冲压裂用于低渗煤层开发可行性分析[J].煤炭技术,2017,36(12):135.
[3]秦勇,邱爱慈,张永民.高聚能重复强脉冲波煤储层增渗新技术试验与探索[J].煤炭科学技术,2014,42(6):1-7.
[4]张永民,邱爱慈,秦勇.电脉冲可控冲击波煤储层增透原理与工程实践[J].煤炭科学技术,2017,45(9):79.
[5]李恒乐,秦勇,张永民,等.重复脉冲强冲击波对肥煤孔隙结构影响的实验研究[J].煤炭学报,2015,40(4):915-921.
[6]贾少华,赵金昌,尹志强,等.基于高压电脉冲煤体增透的水激波波前时间变化规律研究[J].太原理工大学学报,2015,46(6):680-684.
[7]刘敬,吴晋军,周培尧.低渗煤层多脉冲压裂激励作用的裂缝模型研究[J].煤炭技术,2016,35(1):1-4.
[8]尹志强,赵金昌,贾少华,等.基于高压电脉冲的水激波加载特性的实验研究[J].煤炭技术,2016,35(6):182-185.
[9]张春喜.水中丝爆引发的推进效应[D].哈尔滨:哈尔滨理工大学,2005.
[10]贾少华.基于液电效应的水激波时域特性及煤体致裂效果研究[D].太原:太原理工大学,2016.
[11]尹志强.水中高压脉冲放电的液电特性及煤体致裂效果研究[D].太原:太原理工大学,2016.
[12]鲍先凯,杨东伟,段东明,等.高压电脉冲水力压裂法煤层气增透的试验与数值模拟[J].岩石力学与工程学报,2017,36(10):2415-2423.
[13]刘安邦.煤储层多级强脉冲加载压裂破岩机理理论研究[J].石油化工应用,2017,36(1):33-35.
[14]武进壮,巩芳军.多脉冲加载压裂激励作用下的煤层气解吸研究[J].中国煤层气,2016,13(6):12-14.
[15]陶涛,崔洪庆.应力集中带煤体渗透性变化的裂隙效应研究[J].煤矿安全,2014,45(11):53-56.
[16]鲍先凯,赵金昌,武晋文,等.脉冲荷载作用下煤体裂纹扩展研究[J].煤矿安全,2018,49(2):43-46.