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Determination of Long Horizontal Borehole Height in Roofs and Its Application to Gas Drainage

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  • Gang Wang

    (Shandong University of Science and Technology, Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Qingdao 266590, China
    Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China)

  • Cheng Fan

    (Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China)

  • Hao Xu

    (Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China)

  • Xuelin Liu

    (Shandong University of Science and Technology, College of Mining and Safety Engineering, Qingdao 266590, China)

  • Rui Wang

    (College of Mechanical and Electronic Engineering, China University of Petroleum, Qingdao 266580, China)

Abstract

Accurately determining the height of the gas-guiding fracture zone in the overlying strata of the goaf is the key to find the height of the long horizontal borehole in the roof. In order to determine the height, in this study we chose the 6306 working face of Tangkou Coal Mine in China as a research example and used both the theoretical model and discrete element method (DEM) numerical simulation to find the height of the gas-guiding fracture zone and applied the height to drill a long horizontal borehole in the roof of the 6303 working face. Furthermore, the borehole was utilized to deep into the roof for coalbed methane drainage and the results were compared with conventional gas drainage measures from other aspects. The height of the gas-guiding fracture zone was found to be 48.57 m in theoretical model based on the bulk coefficient and the void ratio and to be 51.19 m in the DEM numerical simulation according to the temporal and spatial variation characteristics of porosity. Taking both the results of theoretical analysis and numerical simulation into consideration, we determined that gas-guiding fracture zone is 49.88 m high and applied it to drill a long horizontal borehole deep into the roof in the 6303 working face field. Compared with conventional gas drainage measures, we found that the long horizontal borehole has the high stability, high efficiency and strong adaptability for methane drainage.

Suggested Citation

  • Gang Wang & Cheng Fan & Hao Xu & Xuelin Liu & Rui Wang, 2018. "Determination of Long Horizontal Borehole Height in Roofs and Its Application to Gas Drainage," Energies, MDPI, vol. 11(10), pages 1-18, October.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:10:p:2647-:d:173618
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    References listed on IDEAS

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    1. Kroepsch, Adrianne C., 2018. "Horizontal drilling, changing patterns of extraction, and piecemeal participation: Urban hydrocarbon governance in Colorado," Energy Policy, Elsevier, vol. 120(C), pages 469-480.
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    Cited by:

    1. Shizhe Li & Zhaofeng Wang, 2023. "Study on the Coupling Effect of Stress Field and Gas Field in Surrounding Rock of Stope and Gas Migration Law," Energies, MDPI, vol. 16(18), pages 1-20, September.
    2. Boris V. Malozyomov & Vladimir Ivanovich Golik & Vladimir Brigida & Vladislav V. Kukartsev & Yadviga A. Tynchenko & Andrey A. Boyko & Sergey V. Tynchenko, 2023. "Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors," Energies, MDPI, vol. 16(11), pages 1-16, May.
    3. Yunbing Hou & Junqi Cui & Ruipeng Liu, 2022. "Study on the Long-Distance Gas Pre-Drainage Technology in the Heading Face by Directional Long Borehole," Energies, MDPI, vol. 15(17), pages 1-22, August.
    4. Fan Zhang & Guangsen Wang & Binbin Wang, 2023. "Study and Application of High-Level Directional Extraction Borehole Based on Mining Fracture Evolution Law of Overburden Strata," Sustainability, MDPI, vol. 15(3), pages 1-15, February.

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