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Research progress on permeability improvement mechanisms and technologies of coalbed deep-hole cumulative blasting
International Journal of Coal Science & Technology Pub Date : 2020-04-23 , DOI: 10.1007/s40789-020-00320-5
Deyong Guo , Pengfei Lv , Jiechao Zhao , Chao Zhang

Coalbed gas extraction is an important means of exploiting and utilizing gas resources, as well as a means of preventing coal mine disasters. In view of the low gas extraction rate from coalbeds with high gas content and low permeability, a method of improving permeability through deep-hole cumulative blasting is applied to develop initial directional fractures using a jet flow. Under the action of the blasting stress wave and detonation gas wedge, the fractures extend over a large range within the coal, thereby improving coalbed permeability. This study focuses on the criteria of cumulative blasting-induced coalbed fracturing based on a literature review of the penetration effect of cumulative blasting. On this basis, we summarize the coal fracturing zone, crack extension process, and the key technologies of charging and hole sealing for cumulative blasting. In addition, the latest research progress in the optimization of field test drilling and blasting parameters for cumulative blasting is introduced. Research findings indicate that the permeability improvement mechanism of cumulative blasting could be further enhanced, and the technology and technical equipment are in urgent need of improvement. Finally, development trends in the cumulative blasting permeability improvement technique are identified.



中文翻译:

煤层深孔累积爆破渗透率改善机理与技术研究进展

煤层气开采是开发利用天然气资源的重要手段,也是预防煤矿灾害的一种手段。鉴于从具有高瓦斯含量和低渗透率的煤层中瓦斯抽采率低,一种通过深孔累积爆破提高渗透率的方法被应用来利用射流产生初始的定向裂缝。在爆破应力波和爆轰瓦斯楔的作用下,裂缝在煤体内大范围扩展,从而提高了煤层的渗透性。这项研究基于对累积爆破的渗透作用的文献综述,着眼于累积爆破引起的煤层压裂的标准。在此基础上,我们总结了煤压裂带,裂缝扩展过程,以及累积爆破的装药和封孔的关键技术。此外,介绍了针对累积爆破的现场试验钻探和爆破参数优化的最新研究进展。研究发现表明,可以进一步增强累积爆破的渗透性改善机理,迫切需要改进技术和工艺设备。最后,确定了累积爆破渗透率改进技术的发展趋势。技术装备迫切需要改进。最后,确定了累积爆破渗透率改进技术的发展趋势。技术装备迫切需要改进。最后,确定了累积爆破渗透率改进技术的发展趋势。

更新日期:2020-04-23
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