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A Novel Method for Borehole Blockage Removal and Experimental Study on a Hydraulic Self-Propelled Nozzle in Underground Coal Mines

Author

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  • Zhaolong Ge

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

  • Kai Deng

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

  • Yiyu Lu

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

  • Liang Cheng

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

  • Shaojie Zuo

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

  • Xingdi Tian

    (Songzao Coal-Electricity Limited Liability Company, Chongqing 401445, China)

Abstract

When coal bed methane (CBM) drainage boreholes cross fractured, soft, or water-swelling strata, they collapse and block frequently. Borehole blockages result in a rapid decrease in CBM extraction ability, which leads to a reduction in CBM output and threatens coal mine safety production. To solve these problems, a novel method that uses a self-propelled water-jet nozzle to dredge blocked boreholes in coal seams has been proposed on the basis of the existing technology. Based on a theoretical analysis of the reason for borehole caving and the theory of blockage removal, we optimized the nozzle inlet pressure and selected an appropriate high-pressure resin pipe. A field experiment on the blockage removal of blocked CBM drainage boreholes using the proposed method was run in the Fengchun coal mine, Qijiang, Chongqing, southwest China. In this field trial, the time spent to unblock a borehole varied between 18.52 and 34.98 min, which is much shorter than using a drilling rig. After blockage removal, the average pure volume of the methane drainage of a single borehole was increased from 0.03 L/min to ~1.91–7.30 L/min, and the methane drainage concentration of a single borehole increased from 5% to ~44%–85%. The extraction effect increased significantly.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:9:p:698-:d:77123
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    References listed on IDEAS

    as
    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. 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. Changping Li & Longchen Duan & Songcheng Tan & Victor Chikhotkin, 2018. "Influences on High-Voltage Electro Pulse Boring in Granite," Energies, MDPI, vol. 11(9), pages 1-17, September.
    2. Zhaolong Ge & Kai Deng & Liang Zhang & Shaojie Zuo, 2020. "Development potential evaluation of CO2‐ECBM in abandoned coal mines," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 10(3), pages 643-658, June.
    3. 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.
    4. Rui Gao & Bin Yu & Hongchun Xia & Hongfei Duan, 2017. "Reduction of Stress Acting on a Thick, Deep Coal Seam by Protective-Seam Mining," Energies, MDPI, vol. 10(8), pages 1-15, August.

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