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Assessment of Combustion Cavern Geometry in Underground Coal Gasification Process with the Use of Borehole Ground-Penetrating Radar

Author

Listed:
  • Zenon Pilecki

    (Mineral and Economy Research Institute of the Polish Academy of Sciences, Wybickiego 7A, 31-261 Cracow, Poland)

  • Robert Hildebrandt

    (Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Krzysztof Krawiec

    (Mineral and Economy Research Institute of the Polish Academy of Sciences, Wybickiego 7A, 31-261 Cracow, Poland)

  • Elżbieta Pilecka

    (Faculty of Civil Engineering, Cracow University of Technology, Warszawska 24, 31-155 Cracow, Poland)

  • Zbigniew Lubosik

    (Central Mining Institute, Plac Gwarków 1, 40-166 Katowice, Poland)

  • Tomasz Łątka

    (Faculty of Geology, University of Warsaw, Krakowskie Przedmieście 26/28, 00-927 Warsaw, Poland)

Abstract

In this study, the shape and size of a combustion cavity with a fracture zone in the gasified coal seam was determined with the use of control boreholes and a ground-penetrating radar (BGPR) test. The underground coal gasification (UCG) field-scale experiment was performed in Carboniferous strata in coal seam 501 at a depth of approx. 460 m in the Wieczorek hard coal mine in the Upper Silesian Coal Basin, Poland. After the termination of the UCG reactor, five coring boreholes were drilled to identify the geometry of the resulting combustion cavity and the impact of the UCG process on the surrounding rock mass. Borehole ground-penetrating radar measurements were performed using a 100 MHz antenna in three boreholes with a length of about 40–50 m. This enabled the identification of the boundaries of the combustion cavity and the fracture zone in the coal seam. The fracture zones of rock layers and lithological borders near the control borehole were also depicted. As a result, the cavity was estimated to have a length of around 32 m, a width of around 7 m and a height of around 5 m. The analyses performed with the control boreholes and the BGPR provided sufficient information to determine the geometry of the combustion cavity and the fracture zone.

Suggested Citation

  • Zenon Pilecki & Robert Hildebrandt & Krzysztof Krawiec & Elżbieta Pilecka & Zbigniew Lubosik & Tomasz Łątka, 2023. "Assessment of Combustion Cavern Geometry in Underground Coal Gasification Process with the Use of Borehole Ground-Penetrating Radar," Energies, MDPI, vol. 16(18), pages 1-14, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6734-:d:1244414
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    References listed on IDEAS

    as
    1. Faqiang Su & Takuya Nakanowataru & Ken-ichi Itakura & Koutarou Ohga & Gota Deguchi, 2013. "Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems," Energies, MDPI, vol. 6(5), pages 1-21, May.
    2. Su, Fa-qiang & Itakura, Ken-ichi & Deguchi, Gota & Ohga, Koutarou, 2017. "Monitoring of coal fracturing in underground coal gasification by acoustic emission techniques," Applied Energy, Elsevier, vol. 189(C), pages 142-156.
    3. Yuteng Xiao & Jihang Yin & Yifan Hu & Junzhe Wang & Hongsheng Yin & Honggang Qi, 2019. "Monitoring and Control in Underground Coal Gasification: Current Research Status and Future Perspective," Sustainability, MDPI, vol. 11(1), pages 1-14, January.
    4. Su, Fa-qiang & Wu, Jun-bo & Tao-Zhang, & Deng, Qi-chao & Yu, Yi-he & Hamanaka, Akihiro & Dai, Meng-Jia & Yang, Jun-Nan & He, Xiao-long, 2023. "Study on the monitoring method of cavity growth in underground coal gasification under laboratory conditions," Energy, Elsevier, vol. 263(PE).
    5. Md M. Khan & Joseph P. Mmbaga & Ahad S. Shirazi & Japan Trivedi & Qingzia Liu & Rajender Gupta, 2015. "Modelling Underground Coal Gasification—A Review," Energies, MDPI, vol. 8(11), pages 1-66, November.
    Full references (including those not matched with items on IDEAS)

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