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Rock-Breaking Properties of Multi-Nozzle Bits for Tree-Type Drilling in Underground Coal Mines

Author

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  • Yiyu Lu

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China)

  • Songqiang Xiao

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China)

  • Zhaolong Ge

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China)

  • Zhe Zhou

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China)

  • Kai Deng

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
    National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400044, China)

Abstract

Tree-type drilling is a new technique for drilling radial tree-type boreholes in coal seams in underground mines using water jets to break the coal. The aim is to drain gas from the coal seams in larger quantities and from larger areas than can be done by conventional gas drainage using single boreholes. The self-propelled drill bit is the most important component for this technique. The bit generates a self-propelling force to move forward, break coal, and form a borehole. This paper investigates the relationships between the physical parameters of the forward nozzles in the bit and the diameter and shape of the borehole drilled. The effect of different physical parameters on the rock-breaking efficiency is studied by conducting drilling experiments. The results show that the size, orientation and number of the nozzles significantly affect the rock-breaking efficiency of the bit. To obtain a better rock-breaking efficiency under the experimental conditions used for this paper, the axial angle for forward nozzles should be 15°, the radial angle 90°, and nozzles should be arranged 2.1 mm from the center of a 12 mm drill bit. The experimental results provide a reference for the design of multi-nozzle bits for many applications such as radial jet drilling (RJD) and bent pipe cleaning.

Suggested Citation

  • Yiyu Lu & Songqiang Xiao & Zhaolong Ge & Zhe Zhou & Kai Deng, 2016. "Rock-Breaking Properties of Multi-Nozzle Bits for Tree-Type Drilling in Underground Coal Mines," Energies, MDPI, vol. 9(4), pages 1-17, March.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:4:p:249-:d:66755
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    References listed on IDEAS

    as
    1. Guozhong Hu & Jialin Xu & Fuxi Zhang & Changchun Zhao & Wei Qin & Yiran Zhu, 2015. "Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China," Energies, MDPI, vol. 8(7), pages 1-17, July.
    2. Yiyu Lu & Zhe Zhou & Zhaolong Ge & Xinwei Zhang & Qian Li, 2015. "Research on and Design of a Self-Propelled Nozzle for the Tree-Type Drilling Technique in Underground Coal Mines," Energies, MDPI, vol. 8(12), pages 1-12, December.
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    Cited by:

    1. Xiaodong Ji & Minjun Zhang & Yuanyuan Qu & Hai Jiang & Miao Wu, 2021. "Travel Dynamics Analysis and Intelligent Path Rectification Planning of a Roadheader on a Roadway," Energies, MDPI, vol. 14(21), pages 1-21, November.
    2. Zenghui Liu & Changlong Du & Hongxiang Jiang & Kai Liu, 2017. "Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures," Energies, MDPI, vol. 10(8), pages 1-19, August.
    3. Yanbao Liu & Lipeng He & Linchao Dai & Kai Shen & Quanbin Ba, 2023. "Analysis of Rock Breaking Parameters and Simulation of Mechanical Characteristics of Multi-Nozzle Jet Impact," Sustainability, MDPI, vol. 15(16), pages 1-20, August.

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