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Prevention of Seabed Subsidence of Class-1 Gas Hydrate Deposits via CO 2 -EGR: A Numerical Study with Coupled Geomechanics-Hydrate Reaction-Multiphase Fluid Flow Model

Author

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  • Tzu-Keng Lin

    (Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan)

  • Bieng-Zih Hsieh

    (Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan)

Abstract

The geomechanics effects and seabed subsidence are critical issues that should be considered in the development of a hydrate reservoir. The purpose of this study is to couple the geomechanics, hydrate reaction, and multiphase fluid flow modules to investigate the feasibility of CO 2 enhanced gas recovery (CO 2 -EGR) of a Class-1 hydrate deposit by observing the formation deformation, and the seabed subsidence. The production methods of depressurization and CO 2 -EGR are modeled, respectively. The production behaviors and seabed subsidence of different production methods are compared. The positive influence on the gas recovery for a Class-1 hydrate deposit via CO 2 -EGR is observed. The calculations of seabed subsidence showed a significant improvement can be achieved when CO 2 -EGR was used. The subsidence is only 6.8% of that from the pure depressurization in the case of a pressure drop of 30%. The effects of production pressure drop and production gas rate are investigated. The association between the gas production and the pressure drop of the well is different from the cases of pure depressurization and the CO 2 -EGR. The appropriate initial time for the CO 2 injection is tested. Slighter seabed subsidence is observed when the CO 2 injection is initiated earlier. The case of different injection pressure control showed that a lower injection pressure leads to a heavier seabed subsidence. A higher CO 2 fraction allowed in the produced gas stream results in a higher cumulative gas production, but there is no significant impact on the seabed subsidence.

Suggested Citation

  • Tzu-Keng Lin & Bieng-Zih Hsieh, 2020. "Prevention of Seabed Subsidence of Class-1 Gas Hydrate Deposits via CO 2 -EGR: A Numerical Study with Coupled Geomechanics-Hydrate Reaction-Multiphase Fluid Flow Model," Energies, MDPI, vol. 13(7), pages 1-21, April.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:7:p:1579-:d:339653
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    References listed on IDEAS

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    1. Kim, Tae Hong & Cho, Jinhyung & Lee, Kun Sang, 2017. "Evaluation of CO2 injection in shale gas reservoirs with multi-component transport and geomechanical effects," Applied Energy, Elsevier, vol. 190(C), pages 1195-1206.
    2. Wang, Yi & Feng, Jing-Chun & Li, Xiao-Sen & Zhang, Yu & Han, Han, 2018. "Methane hydrate decomposition and sediment deformation in unconfined sediment with different types of concentrated hydrate accumulations by innovative experimental system," Applied Energy, Elsevier, vol. 226(C), pages 916-923.
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    Cited by:

    1. Qingping Li & Shuxia Li & Shuyue Ding & Zhenyuan Yin & Lu Liu & Shuaijun Li, 2022. "Numerical Simulation of Gas Production and Reservoir Stability during CO 2 Exchange in Natural Gas Hydrate Reservoir," Energies, MDPI, vol. 15(23), pages 1-17, November.
    2. Ye, Hongyu & Chen, Daoyi & Yao, Yuanxin & Wu, Xuezhen & Li, Dayong & Zi, Mucong, 2024. "Exploration of production capacity-geomechanical evaluation and CO2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells," Energy, Elsevier, vol. 296(C).

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