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Title Pore pressure/stress coupling during fluid injection and its implications on CO2 geological storage
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Contributors
Kim, S.
Hosseini, S.A.
Abstract

Geomechanical integrity is critical in determining the successful operation of CO2 geological storage. Because of the anticipated increase in pore pressure, proper prediction of a reservoir stress path during CO2 injection is key for the judgment of how far a stress state will locate away from a risk of geomechanical failure. Recent studies have confirmed that, contrary to traditional approaches in which total stresses remain constant, total stresses also change as fluid extraction/injection disturbs the pore-fluid pressure field. In order to investigate spatio-temporal evolution of the ratio of pore pressure/stress coupling ∆σ/∆P, we conducted numerical simulations that couple fluid flow with poroelasticity for various conditions. These numerical experiments allowed us to examine the effect of material properties and structural geometry on the evolution of ∆σ/∆P. On the basis of observations, we provide examples in which the effect of pore pressure/stress coupling is incorporated in investigating two geomechanical events: borehole failures and shear slip of pre-existing fractures. Finally, we suggest a guideline for applying the effect of pore pressure/stress coupling analytically when assessing the geomechanical integrity of a storage site during CO2 injection.

Collection GCCC Bookshelf
Pages 0
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Keywords Modeling-Flow simulation Risk-fault
Year 2014
Date Published 0000-00-00 00:00:00
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