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A new technique for preventing and controlling coal and gas outburst hazard with pulse hydraulic fracturing: a case study in Yuwu coal mine, China

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  • Quangui Li
  • Baiquan Lin
  • Cheng Zhai

Abstract

Coal and gas outburst is one of the main gas hazards in coal mines, and pulse hydraulic fracturing is a new technique for preventing and controlling gas hazards in coal mines and is presented based on conventional hydraulic fracturing. S2107 is a coal seam with high gas content and coal and gas outburst hazard but with low gas concentrations when extracted. To safely drive air tunnels into S2107, the pulse hydraulic fracturing technique is used on cross-measure boreholes placed from a high-level roadway to the driving roadway to improve the effects of gas drainage and ensure safety during production. The mechanism of coal fracturing via pulsed pressure is analyzed. A variable frequency method is used to strengthen the fatigue damage effect, and the initial pressure is estimated based on previous studies. The layouts of fracturing borehole and guide borehole are designed according to the layer relation, and a new hole sealing method is developed. The results indicate the pressure changes during pulse hydraulic fracturing reflect crack extension, and it is conducive to extending and connecting cracks under pulse pressures. The initial pressure during pulse hydraulic fracturing is negatively related to the water volume and fracturing time but cannot directly influence the fracturing radius. Moreover, this pressure is 30–43 % less than the calculated value. After this application, the gas desorption index, K 1 , at the driving workface decreases to below the critical value. The gas drainage volume of fracturing boreholes and their guide boreholes increases relative to normal boreholes by 3.32-fold and 3.07-fold, respectively. The new technique is promising for preventing and controlling gas hazards in the future. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Quangui Li & Baiquan Lin & Cheng Zhai, 2015. "A new technique for preventing and controlling coal and gas outburst hazard with pulse hydraulic fracturing: a case study in Yuwu coal mine, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 75(3), pages 2931-2946, February.
    • Handle: RePEc:spr:nathaz:v:75:y:2015:i:3:p:2931-2946
    DOI: 10.1007/s11069-014-1469-9
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    References listed on IDEAS

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    1. Dingqi Li, 2014. "Mining thin sub-layer as self-protective coal seam to reduce the danger of coal and gas outburst," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 71(1), pages 41-52, March.
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    Cited by:

    1. Qingying Cheng & Bingxiang Huang & Luying Shao & Xinglong Zhao & Shuliang Chen & Haoze Li & Changwei Wang, 2020. "Combination of Pre-Pulse and Constant Pumping Rate Hydraulic Fracturing for Weakening Hard Coal and Rock Mass," Energies, MDPI, vol. 13(21), pages 1-22, October.
    2. Fangtian Wang & Cun Zhang & Ningning Liang, 2017. "Gas Permeability Evolution Mechanism and Comprehensive Gas Drainage Technology for Thin Coal Seam Mining," Energies, MDPI, vol. 10(9), pages 1-18, September.
    3. Yiyu Lu & Shaojie Zuo & Zhaolong Ge & Songqiang Xiao & Yugang Cheng, 2016. "Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array," Energies, MDPI, vol. 9(7), pages 1-15, June.
    4. Chao Xu & Haoshi Sun & Kai Wang & Liangliang Qin & Chaofei Guo & Zhijie Wen, 2021. "Effect of low‐level roadway tunneling on gas drainage for underlying coal seam mining: Numerical analysis and field application," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 11(4), pages 780-794, August.
    5. Hao Yan & Jixiong Zhang & Nan Zhou & Junli Chen, 2019. "The Enhancement of Lump Coal Percentage by High-Pressure Pulsed Hydraulic Fracturing for Sustainable Development of Coal Mines," Sustainability, MDPI, vol. 11(10), pages 1-14, May.
    6. Mingze Liu & Guang Zhang & Guogang Gou & Bing Bai & Shaobin Hu & Xiaochun Li, 2018. "Experimental and theoretical study on the effect of unsteady flow on the fracturing pressure in hydraulic fracturing test," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 90(3), pages 1137-1151, February.

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