Research on the Effective Scope of Low-permeability Hard Coalbed Coupling and Enhanced Permeability Technology
Journal: Architecture Engineering and Science DOI: 10.32629/aes.v5i4.3211
Abstract
Due to poor gas permeability, high gas content, and hard coal quality at the JiuLiShan coal mine, gas extraction is difficult, and hydraulic perforation has limited effect. This study proposes a permeability enhancement method combining loosening blasting and hydraulic perforation to improve coal seam gas permeability and extraction efficiency. Field tests confirm the technology's effectiveness, showing that the combined method significantly enhances the coal body's permeability. The effective influence radius of the 1# test group (small explosives) is 4-6m, while the 2# test group (large explosives) extends this range to 6-8m, leading to a sustained increase in gas extraction. This approach offers an effective solution for enhancing permeability in complex coal mine conditions.
Keywords
loose blasting, hydraulic punching, combined anti-reflective technology
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[3]Xu D D. Current situation and prospects of coal mine well hydraulic perforation pressure relief and drainage technology [J]. Coal Technology, 2016, 35 (2): 176-178.
[4]Wang Z F, Fan Y C, Li S S. Application of hydraulic drilling technology in soft and low-permeability protruding coal seams [J]. Coal Science and Technology, 2012, 40 (2): 52-55.
[5]Liu X, Zhang F, Ma G. Research on the influence of hydraulic perforation on the evolution of coal reservoir permeability [J]. Coal Science and Technology, 2018, 46(11): 76-81.
[6]Cao Y L. Research status and prospects of hydraulic fracturing technology for the prevention and control of coal and gas outbursts [J]. Coal Mine Safety, 2020, 51(10): 60-66.
[7]Zhao Y, Lin B, Liu T, et al. Gas flow field evolution around hydraulic slotted borehole in anisotropic coal[J]. Journal of Natural Gas Science and Engineering, 2018, 58: 189-200.
[8]Zhang C, Lin B Q, Zhou Y, et al. Study on "fracturing-sealing" integration technology based on high-energy gas fracturing in single seam with high gas and low air permeability[J]. International Journal of Mining Science and Technology,2013,23(6):841-846.
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