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Gas Extraction Mechanism and Effect of Ultra-High-Pressure Hydraulic Slotting Technology: a Case Study in Renlou Coal Mine

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Abstract

Ultra-high-pressure hydraulic slotting technology is an effective method to realize pressure relief and permeability enhancement of a single coal seam. In this paper, through a hydraulic slotting borehole-based total gas extraction amount calculation model, it was concluded that ultra-high-pressure hydraulic slotting technology could increase the gas extraction surface area, improve the gas flow mechanism, and transform single-layer radial flow into interlayer, radial composite flow, thus greatly enhancing the gas extraction efficiency. Based on theoretical results, a field test was conducted in the Renlou coal mine, Anhui Province, China. According to the actual characteristics of the 72 coal seam in the Renlou coal mine, the key slotting parameters of this coal seam were determined. The gas extraction sources of each coal seam could be determined accurately through multi-gas source identification and tracer technology, and the effect of hydraulic slotting pressure relief and permeability enhancement was investigated. The test results indicated that the 100-day gas extraction concentration in boreholes using ultra-high-pressure hydraulic slotting technology was 2.68–7.59 times that in conventional boreholes. The average daily pure extraction volume of slotting boreholes was 3.94 times that of conventional boreholes. Based on the calculation of the gas extraction radius of boreholes in the slotted area, it was found that, under the condition of meeting the same control range of outburst elimination, drilling work could be reduced by more than two-thirds. These achievements could provide critical references for the application of ultra-high-pressure hydraulic slotting technology.

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Acknowledgments

The Author Wishes To Thank Tiandi Technology Co., Ltd., For The Provided Funding Of The Science And Technology Innovation And Entrepreneurship Fund (2021-2-Td-Zd008) (Research On Self-Relief Technology And Equipment Of Bedding Directional Hydraulic Slitting) And The State Key Laboratory Open Fund Project (Sklmrdpc20kf01) (Prevention And Control Technology Of Cross-Cutting, Longitudinal Breaking, Unloading And Energy Dissipation For Coal-Rock Composite Dynamic Disasters In Deep Mines).

Funding

Tiandi Technology Co.,Ltd. for the special funding of Science and Technology Innovation and Entrepreneurship Fund, 2021–2-TD-ZD008, Xingang Niu, The State Key Laboratory Open Fund Project, SKLMRDPC20KF01, Huihui Liu.

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Authors and Affiliations

  1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Xingang Niu & Dongdong Pang

  2. School of Safety Science and Engineering, Anhui University of Science and Technology, Huainan, 232001, Anhui, China

    Xingang Niu & Dongdong Pang

  3. State Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Huihui Liu

  4. State Key Laboratory of the Gas Disaster Detecting Preventing and Emergency Controlling, China Coal Technology and Engineering Group, Chongqing Research Institute, Chongqing, 400037, China

    Xingang Niu, Yongjiang Zhang, Guojian Cheng, Jianjun Cao & Yi Zhao

  5. Gas Research Branch, China Coal Technology and Engineering Group, Chongqing Research Institute, Chongqing, 400037, China

    Xingang Niu, Yongjiang Zhang, Guojian Cheng, Jianjun Cao & Yi Zhao

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  1. Xingang Niu
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  2. Dongdong Pang
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Correspondence to Dongdong Pang or Huihui Liu.

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Niu, X., Pang, D., Liu, H. et al. Gas Extraction Mechanism and Effect of Ultra-High-Pressure Hydraulic Slotting Technology: a Case Study in Renlou Coal Mine. Nat Resour Res 32, 321–339 (2023). https://doi.org/10.1007/s11053-022-10131-x

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