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The Method of Determining Layer in Bottom Drainage Roadway Taking Account of the Influence of Drilling Angle on Gas Extraction Effect

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  • Yuliang Yang

    (School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
    School of Coal Engineering, Shanxi Datong University, Datong 037003, China)

  • Penghua Han

    (School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Zhining Zhao

    (School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

  • Wei Chen

    (School of Energy & Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

Abstract

The pre-drainage of coalbed methane through boreholes in the bottom drainage roadway (BDR) is the key measure to prevent and control coal and gas outburst. Different arrangement layers in the BDR will make a difference in the range of drilling angle and affect the gas extraction effect. In this paper, the mathematical model of the rock loose circle area around elliptical drilling was constructed. Meanwhile, the fluid–solid coupling model is constructed by using COMSOL software, the dynamic response of coal permeability and volumetric strain with gas pressure and the Klinkenberg effect of gas are considered, and the effect of the change of the elliptical drilling angle on the pressure relief effect of the coal seam is studied. The results showed that the distance between the layer in the BDR and the pre-drainage coal seam would decrease, and the effective extraction length at the same point of gas extraction in the coal seam increases. The area of the rock loose circle and permeability around the drilling decayed negatively and exponentially with the increase in drilling angle. As the drilling angle decreased, the stress in the major axis of the ellipse at the drilling cross-section increased, so the drilling was prone to collapse, and the gas extraction was hindered. Finally, an optimal method of determining the layer in the BDR under the coupling effect of multiple factors was established by combining the measured ground stress. Through field measurement, the drilling extraction rate of the optimized scheme is 60% higher than that of the original scheme.

Suggested Citation

  • Yuliang Yang & Penghua Han & Zhining Zhao & Wei Chen, 2022. "The Method of Determining Layer in Bottom Drainage Roadway Taking Account of the Influence of Drilling Angle on Gas Extraction Effect," Sustainability, MDPI, vol. 14(9), pages 1-13, April.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:9:p:5449-:d:807042
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    References listed on IDEAS

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    1. Fu-bao Zhou & Xin-xin Wang & Ying-ke Liu, 2014. "Gas drainage efficiency: an input–output model for evaluating gas drainage projects," 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. 74(2), pages 989-1005, November.
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    Cited by:

    1. Haiqing Shuang & Weitao Meng & Yulong Zhai & Peng Xiao & Yu Shi & Yu Tian, 2022. "Application and Optimization of the Parameters of the High-Level Boreholes in Lateral High Drainage Roadway," Sustainability, MDPI, vol. 14(24), pages 1-18, December.
    2. Pang, Mingkun & Pan, Hongyu & Ji, Bingnan & Zhang, Hang & Zhang, Tianjun, 2023. "Experimental investigation of flow regime transition characteristics of fractured coal bodies around gas extraction boreholes," Energy, Elsevier, vol. 270(C).
    3. Wenjie Xu & Xigui Zheng & Cancan Liu & Peng Li & Boyang Li & Kundai Michael Shayanowako & Jiyu Wang & Xiaowei Guo & Guowei Lai, 2022. "Numerical Simulation Study of High-Pressure Air Injection to Promote Gas Drainage," Sustainability, MDPI, vol. 14(21), pages 1-15, October.

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