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Experimental Study of Crack Initiation and Extension Induced by Hydraulic Fracturing in a Tree-Type Borehole Array

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Listed:
  • 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)

  • 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)

  • 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)

  • Songqiang Xiao

    (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)

  • Yugang 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)

Abstract

High-pressure hydraulic fracturing technology in coal and coal bed methane mines can lead to roof and floor damage, and fracture initiation disorder that leads to a “blank area”, and other issues. A new method of hydraulic fracturing is proposed to increase the homogeneous permeability of coal in underground coalmines. Numerical and other simulation tests for different forms of a tree-type, branched borehole model are presented. The results show that the branched array causes cracks to initiate from the bottom of the array, and these extend along the direction of the adjacent boreholes. Generally, as the number of branched boreholes increases, the coal seam fracture network also increase, improving the distribution of the fracture network, making the fracturing effect better. The branched boreholes appear to reduce initiation pressure and, with increasing branches, the initiation pressure decreases. A model with four tree-type, branched boreholes leads to a reduction in initiation pressure of 69%. In terms of permeability improvement technology in underground coalmines, a branched hydraulic fracturing borehole array has the advantages of reducing initiation pressure, controlling crack initiation and extension, enhancing the fracturing effect and reducing the destruction of the roof and floor.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:9:y:2016:i:7:p:514-:d:73181
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    References listed on IDEAS

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    Cited by:

    1. Jinkai Wang & Hengyi Liu & Jinliang Zhang & Jun Xie, 2018. "Lost Gas Mechanism and Quantitative Characterization during Injection and Production of Water-Flooded Sandstone Underground Gas Storage," Energies, MDPI, vol. 11(2), pages 1-26, January.
    2. Wenlong Shen & Meng Wang & Zhengzheng Cao & Faqiang Su & Hua Nan & Xuelong Li, 2019. "Mining-Induced Failure Criteria of Interactional Hard Roof Structures: A Case Study," Energies, MDPI, vol. 12(15), pages 1-17, August.
    3. Haiyang Wang & Binwei Xia & Yiyu Lu & Tao Gong & Rui Zhang, 2017. "Study on the Propagation Laws of Hydrofractures Meeting a Faulted Structure in the Coal Seam," Energies, MDPI, vol. 10(5), pages 1-17, May.
    4. Peng Gong & Zhanguo Ma & Xiaoyan Ni & Ray Ruichong Zhang, 2017. "Floor Heave Mechanism of Gob-Side Entry Retaining with Fully-Mechanized Backfilling Mining," Energies, MDPI, vol. 10(12), pages 1-19, December.
    5. Liang Cheng & Zhaolong Ge & Binwei Xia & Qian Li & Jiren Tang & Yugang Cheng & Shaojie Zuo, 2018. "Research on Hydraulic Technology for Seam Permeability Enhancement in Underground Coal Mines in China," Energies, MDPI, vol. 11(2), pages 1-19, February.

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