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The Effects of Coupling Stiffness and Slippage of Interface Between the Wellbore and Unconsolidated Sediment on the Stability Analysis of the Wellbore Under Gas Hydrate Production

Author

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  • Jung-Tae Kim

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)

  • Ah-Ram Kim

    (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology, Gyeonggi 10223, Korea)

  • Gye-Chun Cho

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)

  • Chul-Whan Kang

    (Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)

  • Joo Yong Lee

    (Petroleum and Marine Resource Devision, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Korea)

Abstract

Gas hydrates have great potential as future energy resources. Several productivity and stability analyses have been conducted for the Ulleung Basin, and the depressurization method is being considered for production. Under depressurization, ground settlement occurs near the wellbore and axial stress develops. For a safe production test, it is essential to perform a stability analysis for the wellbore and hydrate-bearing sediments. In this study, the development of axial stress on the wellbore was investigated considering the coupling stiffness of the interface between the wellbore and sediment. A coupling stiffness model, which can consider both confining stress and slippage phenomena, was suggested and applied in a numerical simulation. Parametric analyses were conducted to investigate the effects of coupling stiffness and slippage on axial stress development. The results show that shear coupling stiffness has a significant effect on wellbore stability, while normal coupling stiffness has a minor effect. In addition, the maximum axial stress of the well bore has an upper limit depending on the magnitude of the confining stress, and the axial stress converges to this upper limit due to slipping at the interface. The results can be used as fundamental data for the design of wellbore under depressurization-based gas production.

Suggested Citation

  • Jung-Tae Kim & Ah-Ram Kim & Gye-Chun Cho & Chul-Whan Kang & Joo Yong Lee, 2019. "The Effects of Coupling Stiffness and Slippage of Interface Between the Wellbore and Unconsolidated Sediment on the Stability Analysis of the Wellbore Under Gas Hydrate Production," Energies, MDPI, vol. 12(21), pages 1-23, November.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4177-:d:282684
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    1. Jung-Tae Kim & Chul-Whan Kang & Ah-Ram Kim & Joo Yong Lee & Gye-Chun Cho, 2021. "Effect of Permeability on Hydrate-Bearing Sediment Productivity and Stability in Ulleung Basin, East Sea, South Korea," Energies, MDPI, vol. 14(6), pages 1-16, March.

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