Coupled semi‐analytical approach of CO2 injection induced caprock deflection

This study focuses on a specific problem related to the caprock deformation induced by the in-jection of CO2 at depth. The adopted methodology includes the development of a mathematical model that incorporates the deformable behaviour of storage media and the flow of two immiscible fluids (CO2 and wa-ter) within the aquifers while the surface rock or caprock layer is modelled as a thin plate. Governing equa-tions are solved for the axisymmetric flexural deflection due to a constant rate of injection of CO2. The re-sults show that this semi-analytical solution is capable of capturing the pressure build-up during the very early stage of injection, resulting in a high rate of surface uplift. The calculation time required using the semi-analytical solution is very short; it can be employed as a preliminary design tool for risk assessment using pa-rameters such as the injection rate, porosity, rock properties and geological structures. This semi-analytical solution provides a convenient way to estimate the influence of high injection rates of CO2 on the caprock de-formation. The methodology in this development can easily incorporate other pressure distributions; thus ad-vances in hydrology researches can also benefit this approach.


Published in:
Computer Methods and Advances in Geomechanics: Proceedings of the 14th International Conference on Computer Methods and Advances in Geomechanics, Kyoto, Japan, 22-25 September 2014
Presented at:
14th International Conference on Computer Methods and Advances in Geomechanics, Kyoto, Japan, 22-25 September 2014
Year:
2014
Publisher:
Fusao Oka, Akira Murakami, Ryosuke Uzuoka, Sayuri Kimoto
Laboratories:




 Record created 2014-09-30, last modified 2018-01-28


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