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The Influence of Particle Size and Hydrate Formation Path on the Geomechanical Behavior of Hydrate Bearing Sands

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  • Mandeep R. Pandey

    (Department of Civil Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

  • Jeffrey A. Priest

    (Department of Civil Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

  • Jocelyn L. Hayley

    (Department of Civil Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

Abstract

Determining the geomechanical properties of hydrate-bearing sands (HBS), such as strength and stiffness, are critical for evaluating the potential for the economic and safe recovery of methane gas from HBS reservoirs. To date, results from numerous independent laboratory studies on synthesized HBS have shown that strength and stiffness are largely influenced by hydrate saturation, the method adopted for hydrate formation, and to a lesser extent, the confining stresses applied during testing. However, a significant scatter is observed in the data even when these conditions are similar. These include recent studies on natural HBS where sands with larger particle size distribution (PSD) exhibited higher strengths despite lower hydrate saturation. To investigate the impact of PSD, and the role that specific hydrate formation conditions might impose, on the strength and stiffness of HBS, a series of laboratory tests were carried out on sand specimens formed with different particle size distributions and utilizing different approaches for forming gas saturated HBS. The laboratory apparatus included a resonant column drive head to measure the small-strain stiffness of the specimen during hydrate formation, and subsequent drained compressional shearing to capture the stress-strain response of the HBS. Results indicate that the PSD significantly affects both the stiffness evolution (during hydrate formation) and peak strength at failure after formation compared to the effect of the methodology adopted for hydrate formation. These observations improve our understanding of the geomechanical behavior of laboratory-synthesized HBS and allow more robust relationships to be developed between them and natural HBS. This may aid in the development of economic and safe methane gas production methods to help realize the energy resource potential of HBS reservoirs.

Suggested Citation

  • Mandeep R. Pandey & Jeffrey A. Priest & Jocelyn L. Hayley, 2022. "The Influence of Particle Size and Hydrate Formation Path on the Geomechanical Behavior of Hydrate Bearing Sands," Energies, MDPI, vol. 15(24), pages 1-23, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9632-:d:1008141
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    References listed on IDEAS

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    1. T. S. Majmudar & R. P. Behringer, 2005. "Contact force measurements and stress-induced anisotropy in granular materials," Nature, Nature, vol. 435(7045), pages 1079-1082, June.
    2. Klaus Wallmann & Elena Pinero & Ewa Burwicz & Matthias Haeckel & Christian Hensen & Andrew Dale & Lars Ruepke, 2012. "The Global Inventory of Methane Hydrate in Marine Sediments: A Theoretical Approach," Energies, MDPI, vol. 5(7), pages 1-50, July.
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