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Multi-well strategy for gas production by depressurization from methane hydrate-bearing sediments

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  • Terzariol, M.
  • Santamarina, J.C.

Abstract

Hydrate-bearing sediments are a potential source of energy. Depressurization is the preferred production method in mechanically stable and highly permeable sandy reservoirs. The goal of this study is to develop closed-form analytical solutions for multi-well depressurization strategies and to explore the synergistic interactions among wells. The key variables are the aquitard and sediment permeabilities, the reservoir layer and aquitard thicknesses, and water pressures in the far-field, at phase transformation and at the wells. These variables combine to define two governing dimensionless ratios (for permeability and fluid pressure), and a characteristic length scale λsed. Proposed solutions show that synergistic multi-well strategies dissociate a larger hydrate volume than an equal number of individual wells working independently. The optimal distance between wells increases: (1) with the length scale λsed, (2) for tighter aquitards, (3) for lower well pressure and when the original water pressure of the reservoir is close to the dissociation pressure, and (4) when both the aquitard and the reservoir are thick. Implications extend to both vertical and horizontal wells. The proposed closed-form solutions expedite design and economic analyses and allow the fast comparison of potential production scenarios.

Suggested Citation

  • Terzariol, M. & Santamarina, J.C., 2021. "Multi-well strategy for gas production by depressurization from methane hydrate-bearing sediments," Energy, Elsevier, vol. 220(C).
  • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328176
    DOI: 10.1016/j.energy.2020.119710
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    References listed on IDEAS

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    1. Sun, Jiaxin & Qin, Fanfan & Ning, Fulong & Gu, Yuhang & Li, Yanlong & Cao, Xinxin & Mao, Peixiao & Liu, Tianle & Qin, Shunbo & Jiang, Guosheng, 2023. "Gas recovery from silty hydrate reservoirs by using vertical and horizontal well patterns in the South China Sea: Effect of well spacing and its optimization," Energy, Elsevier, vol. 275(C).
    2. Dong, Lin & Li, Yanlong & Wu, Nengyou & Wan, Yizhao & Liao, Hualin & Wang, Huajian & Zhang, Yajuan & Ji, Yunkai & Hu, Gaowei & Leonenko, Yuri, 2023. "Numerical simulation of gas extraction performance from hydrate reservoirs using double-well systems," Energy, Elsevier, vol. 265(C).
    3. Sun, Xian & Xiao, Peng & Wang, Xiao-Hui & Sun, Yi-Fei & Li, Xing-Xun & Pang, Wei-Xin & Li, Qing-Ping & Sun, Chang-Yu & Chen, Guang-Jin, 2023. "Study on the influence of well closure and production pressure during dual-gas co-production from hydrate-bearing sediment containing underlying gas," Energy, Elsevier, vol. 279(C).
    4. Cao, Xinxin & Sun, Jiaxin & Qin, Fanfan & Ning, Fulong & Mao, Peixiao & Gu, Yuhang & Li, Yanlong & Zhang, Heen & Yu, Yanjiang & Wu, Nengyou, 2023. "Numerical analysis on gas production performance by using a multilateral well system at the first offshore hydrate production test site in the Shenhu area," Energy, Elsevier, vol. 270(C).

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