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Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production

Author

Listed:
  • Huiying Tang

    (College of Engineering, Peking University, Beijing 100871, China)

  • Yuan Di

    (College of Engineering, Peking University, Beijing 100871, China)

  • Yongbin Zhang

    (Tarim Oil Company, PetroChina, Korla 841000, Xinjiang, China)

  • Hangyu Li

    (Department of Energy Resources Engineering, Stanford University, Stanford, CA 94305, USA)

Abstract

Unconventional shale gas production is often characterized by a short period of high production followed by a rapid decline in the production rate. Given the high costs of hydraulic fracturing and horizontal drilling, it is critical to identify the mechanisms behind the production loss. The existing shale gas production models often assume constant matrix permeability. However, laboratory observations show that matrix permeability can decrease significantly with increasing effective stress, which highlights the necessity of considering the stress-dependent properties of shale matrix in production analysis. Moreover, the compaction of pore space will also increase the matrix permeability by enhancing the gas-slippage effect. In this paper, a matrix permeability model which couples the effect of pore volume compaction and non-Darcy slip flow is derived. Numerical simulations are conducted to understand the role of matrix permeability evolution during production. Changes of fractures’ permeability and contact area during depletion process are also taken into account. The results indicate that the loss of fracture permeability has a greater impact at the early stage of the depletion process, while matrix permeability evolution is more important for the long-term production.

Suggested Citation

  • Huiying Tang & Yuan Di & Yongbin Zhang & Hangyu Li, 2017. "Impact of Stress-Dependent Matrix and Fracture Properties on Shale Gas Production," Energies, MDPI, vol. 10(7), pages 1-13, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:996-:d:104698
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. Shaowei Zhang & Mengzi Zhang & Zhen Wang & Rongwang Yin, 2023. "RETRACTED ARTICLE: Research on shale gas productivity prediction method based on optimization algorithm," Journal of Combinatorial Optimization, Springer, vol. 45(5), pages 1-14, July.
    2. Chuanliang Yan & Yuanfang Cheng & Fucheng Deng & Ji Tian, 2017. "Permeability Change Caused by Stress Damage of Gas Shale," Energies, MDPI, vol. 10(9), pages 1-11, September.

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