CO 2 plume migration in underground CO 2 storage: The effects of induced hydraulic gradients

Vosper, H.; Chadwick, R.A.; Williams, G.A.. 2018 CO 2 plume migration in underground CO 2 storage: The effects of induced hydraulic gradients. International Journal of Greenhouse Gas Control, 74. 271-281. https://doi.org/10.1016/j.ijggc.2018.05.006

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Abstract/Summary

The use of water production as a pressure mitigation tool in the context of CO2 storage is widely studied but the impact it might have on the migration behaviour of a buoyant CO2 plume is less well reported. To investigate this further two different scenarios were modelled. In the first, a single water production well was used to draw CO2 along the strike of an open aquifer with a regional dip. Large rates of water production (5–10 times the volume of injected CO2) were required to achieve only small displacements of the CO2 plume. The second scenario investigated to what extent an induced hydraulic gradient might spill CO2 already stored in a structural trap. Here the effects were more pronounced with over 90% of the CO2 being spilled at a water cycling rate of 10 Mt per year (corresponding to a hydraulic gradient of 1.28 bar/km). The modelling was tested by the real case at Sleipner where CO2 migration in the Utsira Sand is potentially impacted by water production at the nearby Volve field. Simulations concluded that the CO2 plume at Sleipner should not be materially affected by water production from Volve and this is supported by the time-lapse seismics.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.ijggc.2018.05.006
ISSN:	17505836
Date made live:	18 Jun 2018 13:09 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/520296

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