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Research on and Design of a Self-Propelled Nozzle for the Tree-Type Drilling Technique in Underground Coal Mines

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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)

  • Zhe Zhou

    (State Key Laboratory of Coal Mine Disaster Dynamics and Control, 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)

  • Xinwei Zhang

    (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)

  • Qian Li

    (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

Due to the increasing depths of coal mines and the low permeability of some coal seams, conventional methods of gas drainage in underground mines are facing many problems. To improve gas extraction, a new technique using water jets to drill tree-type boreholes in coal seams is proposed. A self-propelled water-jet drilling nozzle was designed to drill these boreholes. The configuration of the self-propelled nozzle was optimized by conducting drilling experiments and self-propelling force measurements. Experimental results show that the optimal self-propelled nozzle has a forward orifice axial angle at 25°, a radial angle at 90°, a center distance of 1.5 mm, and backward pointing orifices with an axial angle of 25°. The self-propelling force generated by the jets of the nozzle with 30 MPa pump pressure can reach 29.8 N, enough to pull the hose and the nozzle forward without any external forces. The nozzle can drill at speeds up to 41.5 m/h with pump pressures at 30 MPa. The radial angles of the forward orifices improve the rock breaking performance of the nozzle and, with the correct angle, the rock breaking area of the orifices overlap to produce a connecting hole. The diameter of boreholes drilled by this nozzle can reach 35.2 mm. The nozzle design can be used as the basis for designing other self-propelled nozzles. The drilling experiments demonstrate the feasibility of using the tree-type drilling technique in underground mines.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:12:p:12426-14271:d:60794
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    References listed on IDEAS

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    1. Yiyu Lu & Liang Cheng & Zhaolong Ge & Binwei Xia & Qian Li & Jiufu Chen, 2015. "Analysis on the Initial Cracking Parameters of Cross-Measure Hydraulic Fracture in Underground Coal Mines," Energies, MDPI, vol. 8(7), pages 1-18, July.
    2. Yongbin Zhang & Bin Gong & Junchao Li & Hangyu Li, 2015. "Discrete Fracture Modeling of 3D Heterogeneous Enhanced Coalbed Methane Recovery with Prismatic Meshing," Energies, MDPI, vol. 8(6), pages 1-24, June.
    3. 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.
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    Cited by:

    1. Yiyu Lu & Shaojie Zuo & Zhaolong Ge & Songqiang Xiao & Yugang Cheng, 2016. "Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array," Energies, MDPI, vol. 9(7), pages 1-15, June.
    2. Qian Li & Yiyu Lu & Zhaolong Ge & Zhe Zhou & Jingwei Zheng & Songqiang Xiao, 2017. "A New Tree-Type Fracturing Method for Stimulating Coal Seam Gas Reservoirs," Energies, MDPI, vol. 10(9), pages 1-14, September.
    3. Jiwei Wen & Chen Chen, 2017. "Optimizing the Structure of the Straight Cone Nozzle and the Parameters of Borehole Hydraulic Mining for Huadian Oil Shale Based on Experimental Research," Energies, MDPI, vol. 10(12), pages 1-14, December.
    4. Zhaolong Ge & Kai Deng & Yiyu Lu & Liang Cheng & Shaojie Zuo & Xingdi Tian, 2016. "A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines," Energies, MDPI, vol. 9(9), pages 1-13, August.
    5. 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.
    6. Zhenlong Fang & Qiang Wu & Mengda Zhang & Haoyang Liu & Pan Jiang & Deng Li, 2019. "Large Eddy Simulation of Self-Excited Oscillation Pulsed Jet (SEOPJ) Induced by a Helmholtz Oscillator in Underground Mining," Energies, MDPI, vol. 12(11), pages 1-20, June.
    7. Zhongxiang Liu & Minghui Wei & Peng Zhang & Yutao Zhang & Tingtao Lu & Rui Xiong & Changchun Qin, 2020. "Drilling Localization and Error Analysis of Radial Horizontal Jet Drilling Based on Magnetic Gradient Tensor," Energies, MDPI, vol. 13(19), pages 1-10, September.

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