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Impact of Local Effects on the Evolution of Unconventional Rock Permeability

Author

Listed:
  • Xinxing Ma

    (Oil & Gas Technology Research Institute of Changqing Oilfield Company, Xi’an 710018, China)

  • Xianwen Li

    (Oil & Gas Technology Research Institute of Changqing Oilfield Company, Xi’an 710018, China)

  • Shouwen Zhang

    (Guangzhou Urban Planning & Design Survey Research Institute, Guangzhou 510060, China)

  • Yanming Zhang

    (Oil & Gas Technology Research Institute of Changqing Oilfield Company, Xi’an 710018, China)

  • Xiangie Hao

    (Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology, Beijing 100083, China)

  • Jishan Liu

    (Department of Chemical Engineering, School of Engineering, The University of Western Australia, WA 6009, Australia)

Abstract

When gas is extracted from unconventional rock, local equilibrium conditions between matrixes and fractures are destroyed and significant local effects are introduced. Although the interactions between the matrix and fracture have a strong influence on the permeability evolution, they are not understood well. This may be the reason why permeability models in commercial codes do not include the matrix-fracture interactions. In this study, we introduced the local force to define the interactions between the matrix and the fracture and derived a set of partial differential equations to define the full coupling of rock deformation and gas flow both in the matrix and in the fracture systems. The full set of cross-coupling formulations were solved to generate permeability evolution profiles during unconventional gas extraction. The results of this study demonstrate that the contrast between the matrix and fracture properties controls the processes and their evolutions. The primary reason is the gas diffusion from fractures to matrixes. The diffusion changes the force balance, mass exchange and deformation.

Suggested Citation

  • Xinxing Ma & Xianwen Li & Shouwen Zhang & Yanming Zhang & Xiangie Hao & Jishan Liu, 2019. "Impact of Local Effects on the Evolution of Unconventional Rock Permeability," Energies, MDPI, vol. 12(3), pages 1-17, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:478-:d:202868
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    Citations

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    Cited by:

    1. Jianchao Cai & Zhien Zhang & Qinjun Kang & Harpreet Singh, 2019. "Recent Advances in Flow and Transport Properties of Unconventional Reservoirs," Energies, MDPI, vol. 12(10), pages 1-5, May.
    2. Paulina Krakowska & Paweł Madejski, 2019. "Research on Fluid Flow and Permeability in Low Porous Rock Sample Using Laboratory and Computational Techniques," Energies, MDPI, vol. 12(24), pages 1-17, December.

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