Effect of heating depressurization on the geomechanical behaviour of hydrate bearing sands
Derrick Ayebazibwe, Jeffrey A Priest, Jocelyn L Hayley
In the proceedings of: GeoSaskatoon 2023: 76th Canadian Geotechnical ConferenceSession: Geoenvironmental 2
ABSTRACT: The study examines methane hydrate-bearing sand (HBS) deposits, a potential future energy resource found in deep-water marine sediments or below permafrost. Extracting methane involves dissociating the hydrate, leading to changes in mechanical behaviour of the HBS. Current constitutive models applied to simulate reservoir response have been calibrated neglecting the effects of hydrate dissociation, relying on post-formation laboratory tests. This research investigates how temperature and pressure changes influence hydrate dissociation and the resulting strength and stiffness of HBS. Tests involving hydrate dissociation to different degrees were conducted on synthesized HBS specimens, that showed reductions in stiffness and peak strength. These changes began to occur within the bulk hydrate stability boundary, likely due to pore-scale effects. Further studies aim to explore the contributing factors to these observations.
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Ayebazibwe, Derrick, Priest, Jeffrey A, Hayley, Jocelyn L (2023) Effect of heating depressurization on the geomechanical behaviour of hydrate bearing sands in GEO2023. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Ayebazibwe_GEO2023_33,
author = {{Ayebazibwe, Derrick}, {Priest, Jeffrey A}, {Hayley, Jocelyn L}}
title = {Effect of heating depressurization on the geomechanical behaviour of hydrate bearing sands}
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {Effect of heating depressurization on the geomechanical behaviour of hydrate bearing sands}
booktitle = {Proceedings of the 76th Canadian Geotechnical Conference}
year = {2023}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }