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The Effects of the Length and Conductivity of Artificial Fracture on Gas Production from a Class 3 Hydrate Reservoir

Author

Listed:
  • Shilong Shang

    (College of Engineering, Peking University, Beijing 100871, China
    Beijing International Center for Gas Hydrate, School of Earth and Space Sciences, Peking University, Beijing 100871, China)

  • Lijuan Gu

    (Beijing International Center for Gas Hydrate, School of Earth and Space Sciences, Peking University, Beijing 100871, China)

  • Hailong Lu

    (Beijing International Center for Gas Hydrate, School of Earth and Space Sciences, Peking University, Beijing 100871, China)

Abstract

Natural gas hydrate is considered as a potential energy resource. To develop technologies for the exploitation of natural gas hydrate, several field gas production tests have been carried out in permafrost and continental slope sediments. However, the gas production rates in these tests were still limited, and the low permeability of the hydrate-bearing sediments is identified as one of the crucial factors. Artificial fracturing is proposed to promote gas production rate by improving reservoir permeability. In this research, numerical studies about the effect of fracture length and fluid conductivity on production performance were carried out on an artificially fractured Class 3 hydrate reservoir (where the single hydrate zone is surrounded by an overlaying and underlying hydrate-free zone), in which the equivalent conductivity method was applied to depict the artificial fracture. The results show that artificial fracture can enhance gas production by offering an extra fluid flow channel for the migration of gas released from hydrate dissociation. The effect of fracture length on production is closely related to the time frame of production, and gas production improvement by enlarging the fracture length is observed after a certain production duration. Through the production process, secondary hydrate formation is absent in the fracture, and the high conductivity in the fracture is maintained. The results indicate that the increase in fracture conductivity has a limited effect on enhancing gas production.

Suggested Citation

  • Shilong Shang & Lijuan Gu & Hailong Lu, 2021. "The Effects of the Length and Conductivity of Artificial Fracture on Gas Production from a Class 3 Hydrate Reservoir," Energies, MDPI, vol. 14(22), pages 1-13, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:22:p:7513-:d:676139
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    References listed on IDEAS

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    3. E. Dendy Sloan, 2003. "Fundamental principles and applications of natural gas hydrates," Nature, Nature, vol. 426(6964), pages 353-359, November.
    4. Yin, Zhenyuan & Moridis, George & Chong, Zheng Rong & Tan, Hoon Kiang & Linga, Praveen, 2018. "Numerical analysis of experimental studies of methane hydrate dissociation induced by depressurization in a sandy porous medium," Applied Energy, Elsevier, vol. 230(C), pages 444-459.
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