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Pressure-transient behavior in class III hydrate reservoirs

Author

Listed:
  • Hou, Jian
  • Zhao, Ermeng
  • Liu, Yongge
  • Ji, Yunkai
  • Lu, Nu
  • Liu, Yueliang
  • Li, Huazhou Andy
  • Bai, Yajie

Abstract

Hydrate reservoirs generally have some unique characteristics such as hydrate dissociation and reformation, permeability change, which may result in quite different pressure-transient behavior from that in conventional reservoirs. In this work, we develop the pressure-transient analysis method for Class III hydrate reservoirs. By establishing a 2D cylindrical model, we then conduct a pressure buildup test and five flow regimes are identified according to the exhibited characteristics observed from the pressure-transient curves. Furthermore, sensitivity analysis is conducted to study the effects of initial reservoir pressure, initial reservoir temperature, permeability reduction exponent, BHP (bottom-hole pressure), and production time on pressure-transient behavior. We identify five flow regimes on the pressure-transient curves. Due to the dissociation of gas hydrate, the first regime is dominated by the non-uniform distribution of permeability, and the pressure derivative curve exhibits an upward straight line. We identify a “V-shaped” valley in the second regime with a peak in the third regime, which suggests the occurrence of hydrate reformation near the wellbore. Such characteristics exhibited in the three regimes are unique to hydrate reservoirs. In addition, the methodology proposed in this study is successfully applied to analyze the actual well testing data obtained from the Malik hydrate reservoir in Canada.

Suggested Citation

  • Hou, Jian & Zhao, Ermeng & Liu, Yongge & Ji, Yunkai & Lu, Nu & Liu, Yueliang & Li, Huazhou Andy & Bai, Yajie, 2019. "Pressure-transient behavior in class III hydrate reservoirs," Energy, Elsevier, vol. 170(C), pages 391-402.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:391-402
    DOI: 10.1016/j.energy.2018.12.178
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    References listed on IDEAS

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    1. Chen, Lin & Sasaki, Hirotoshi & Watanabe, Tsutomu & Okajima, Junnosuke & Komiya, Atsuki & Maruyama, Shigenao, 2017. "Production strategy for oceanic methane hydrate extraction and power generation with Carbon Capture and Storage (CCS)," Energy, Elsevier, vol. 126(C), pages 256-272.
    2. Terzariol, M. & Goldsztein, G. & Santamarina, J.C., 2017. "Maximum recoverable gas from hydrate bearing sediments by depressurization," Energy, Elsevier, vol. 141(C), pages 1622-1628.
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    4. Lu, Nu & Hou, Jian & Liu, Yongge & Barrufet, Maria A. & Ji, Yunkai & Xia, Zhizeng & Xu, Boyue, 2018. "Stage analysis and production evaluation for class III gas hydrate deposit by depressurization," Energy, Elsevier, vol. 165(PB), pages 501-511.
    5. Hou, Jian & Xia, Zhizeng & Li, Shuxia & Zhou, Kang & Lu, Nu, 2016. "Operation parameter optimization of a gas hydrate reservoir developed by cyclic hot water stimulation with a separated-zone horizontal well based on particle swarm algorithm," Energy, Elsevier, vol. 96(C), pages 581-591.
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    Cited by:

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