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Numerical Simulation Study of High-Pressure Air Injection to Promote Gas Drainage

Author

Listed:
  • Wenjie Xu

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Xigui Zheng

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Cancan Liu

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Peng Li

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Boyang Li

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Kundai Michael Shayanowako

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Jiyu Wang

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Xiaowei Guo

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Guowei Lai

    (Key Laboratory of Deep Coal Resource Mining of the Ministry of Education, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

Abstract

Coal-accompanying gas is an essential resource, with numerous mining methods. The practice has proved that injecting high-pressure air into the coal seam can replace and flush the gas in the coal seam, effectively solving the problem of inadequate single gas drainage in soft and low permeability coal seams. This paper uses the finite element method to solve the model, simulate and study the gas drainage by high-pressure air injection in the bedding drilling, and establish a fluid-structure coupling model for gas drainage by high-pressure air injection. The competitive adsorption of N 2 , O 2 , and CH 4 , diffusion and migration of CH 4 in coal matrix and fissure, matrix deformation caused by CH 4 adsorption, and desorption and control of coal deformation by applied stress are considered in the model. When the fixed extraction time is 600 days (d), the optimal spacing between the extraction hole and injection hole is 12.5 m. The safe extraction effect and minimum drilling amount can be ensured. It provides a basis for guiding gas drainage by injecting high-pressure air on-site.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:21:p:13699-:d:950241
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    References listed on IDEAS

    as
    1. Fan, Chaojun & Elsworth, Derek & Li, Sheng & Zhou, Lijun & Yang, Zhenhua & Song, Yu, 2019. "Thermo-hydro-mechanical-chemical couplings controlling CH4 production and CO2 sequestration in enhanced coalbed methane recovery," Energy, Elsevier, vol. 173(C), pages 1054-1077.
    2. Lin, Jia & Ren, Ting & Cheng, Yuanping & Nemcik, Jan & Wang, Gongda, 2019. "Cyclic N2 injection for enhanced coal seam gas recovery: A laboratory study," Energy, Elsevier, vol. 188(C).
    3. Yang, Xin & Wang, Gongda & Du, Feng & Jin, Longzhe & Gong, Haoran, 2022. "N2 injection to enhance coal seam gas drainage (N2-ECGD): Insights from underground field trial investigation," Energy, Elsevier, vol. 239(PC).
    4. 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.
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