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Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam

Received: 12 September 2020     Published: 17 October 2020
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Abstract

Multi-stage fracturing technology for horizontal Wells is one of the effective methods of coal seam volume reconstruction at present. This technology can effectively form a volumetric seam network, increase the volume of coal seam segment reconstruction, increase the area of gas seepage channel, and reduce the generation of coal powder. In order to study the mutual interference of multi-fracture extension in hydraulic fracturing of coal seam and to solve the problem of unclear effect of fracturing construction parameters in coal seam at present, this paper, based on the extended finite element method (XFEM), conducts fluid-solid coupling simulation using pore pressure element (C3D8P), and establishes a calculation model of multi-fracture extension in coal seam. This model is used to study the influence of perforating cluster number, cluster spacing and non-uniformity on hydraulic fracture propagation. The calculated results indicate that, with the increase of the number of perforating clusters, the surface stress field is disturbed more seriously by fractures, and the volume of formation reconstruction also increases correspondingly. After comprehensive comparison, it is believed that the optimal fracturing effect can be achieved when two clusters of perforating clusters are used. The larger the cluster spacing, the smaller the inter-fracture interference, and the higher the formation pore pressure during fracturing. The non-uniformity between clusters has a great influence on fracture propagation. When the displacement of the middle cluster is 1/4, the inhibition effect is severe and it is difficult to form effective fracturing fracture. Finally, the model is used to optimize the multi-stage fracturing construction parameters of horizontal well in coal seam, which provides reference and guidance for the design of hydraulic fracturing scheme.

Published in Science Discovery (Volume 8, Issue 5)
DOI 10.11648/j.sd.20200805.16
Page(s) 107-112
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2020. Published by Science Publishing Group

Keywords

Horizontal Well, Coal Seam, Hydrofracture, XFEM

References
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  • APA Style

    Zhang Weiqiang, Pu Chunsheng. (2020). Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam. Science Discovery, 8(5), 107-112. https://doi.org/10.11648/j.sd.20200805.16

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    ACS Style

    Zhang Weiqiang; Pu Chunsheng. Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam. Sci. Discov. 2020, 8(5), 107-112. doi: 10.11648/j.sd.20200805.16

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    AMA Style

    Zhang Weiqiang, Pu Chunsheng. Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam. Sci Discov. 2020;8(5):107-112. doi: 10.11648/j.sd.20200805.16

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  • @article{10.11648/j.sd.20200805.16,
      author = {Zhang Weiqiang and Pu Chunsheng},
      title = {Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam},
      journal = {Science Discovery},
      volume = {8},
      number = {5},
      pages = {107-112},
      doi = {10.11648/j.sd.20200805.16},
      url = {https://doi.org/10.11648/j.sd.20200805.16},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sd.20200805.16},
      abstract = {Multi-stage fracturing technology for horizontal Wells is one of the effective methods of coal seam volume reconstruction at present. This technology can effectively form a volumetric seam network, increase the volume of coal seam segment reconstruction, increase the area of gas seepage channel, and reduce the generation of coal powder. In order to study the mutual interference of multi-fracture extension in hydraulic fracturing of coal seam and to solve the problem of unclear effect of fracturing construction parameters in coal seam at present, this paper, based on the extended finite element method (XFEM), conducts fluid-solid coupling simulation using pore pressure element (C3D8P), and establishes a calculation model of multi-fracture extension in coal seam. This model is used to study the influence of perforating cluster number, cluster spacing and non-uniformity on hydraulic fracture propagation. The calculated results indicate that, with the increase of the number of perforating clusters, the surface stress field is disturbed more seriously by fractures, and the volume of formation reconstruction also increases correspondingly. After comprehensive comparison, it is believed that the optimal fracturing effect can be achieved when two clusters of perforating clusters are used. The larger the cluster spacing, the smaller the inter-fracture interference, and the higher the formation pore pressure during fracturing. The non-uniformity between clusters has a great influence on fracture propagation. When the displacement of the middle cluster is 1/4, the inhibition effect is severe and it is difficult to form effective fracturing fracture. Finally, the model is used to optimize the multi-stage fracturing construction parameters of horizontal well in coal seam, which provides reference and guidance for the design of hydraulic fracturing scheme.},
     year = {2020}
    }
    

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  • TY  - JOUR
    T1  - Numerical Simulation Study on Influence of Multi-seam Propagation of Hydraulic Fracture in Coal Seam
    AU  - Zhang Weiqiang
    AU  - Pu Chunsheng
    Y1  - 2020/10/17
    PY  - 2020
    N1  - https://doi.org/10.11648/j.sd.20200805.16
    DO  - 10.11648/j.sd.20200805.16
    T2  - Science Discovery
    JF  - Science Discovery
    JO  - Science Discovery
    SP  - 107
    EP  - 112
    PB  - Science Publishing Group
    SN  - 2331-0650
    UR  - https://doi.org/10.11648/j.sd.20200805.16
    AB  - Multi-stage fracturing technology for horizontal Wells is one of the effective methods of coal seam volume reconstruction at present. This technology can effectively form a volumetric seam network, increase the volume of coal seam segment reconstruction, increase the area of gas seepage channel, and reduce the generation of coal powder. In order to study the mutual interference of multi-fracture extension in hydraulic fracturing of coal seam and to solve the problem of unclear effect of fracturing construction parameters in coal seam at present, this paper, based on the extended finite element method (XFEM), conducts fluid-solid coupling simulation using pore pressure element (C3D8P), and establishes a calculation model of multi-fracture extension in coal seam. This model is used to study the influence of perforating cluster number, cluster spacing and non-uniformity on hydraulic fracture propagation. The calculated results indicate that, with the increase of the number of perforating clusters, the surface stress field is disturbed more seriously by fractures, and the volume of formation reconstruction also increases correspondingly. After comprehensive comparison, it is believed that the optimal fracturing effect can be achieved when two clusters of perforating clusters are used. The larger the cluster spacing, the smaller the inter-fracture interference, and the higher the formation pore pressure during fracturing. The non-uniformity between clusters has a great influence on fracture propagation. When the displacement of the middle cluster is 1/4, the inhibition effect is severe and it is difficult to form effective fracturing fracture. Finally, the model is used to optimize the multi-stage fracturing construction parameters of horizontal well in coal seam, which provides reference and guidance for the design of hydraulic fracturing scheme.
    VL  - 8
    IS  - 5
    ER  - 

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Author Information
  • School of Petroleum Engineering, China University of Petroleum, Qingdao, China

  • School of Petroleum Engineering, China University of Petroleum, Qingdao, China

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