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| Titel |
Upscaled modeling of CO2 injection with coupled thermal processes |
| VerfasserIn |
Sarah Gasda, Annette Stephansen, Helge Dahle, Ivar Aavatsmark |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080194
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| Zusammenfassung |
| Large-scale models of CO2 storage in geological formations must capture the relevant
physical, chemical and thermodynamical processes that affect the migration and ultimate fate
of injected CO2. These processes should be modeled over the appropriate length and time
scales. Some important mechanisms include convection-driven dissolution, caprock
roughness, and local capillary effects, all of which can impact the direction and speed of the
plume as well as long-term trapping efficiency. In addition, CO2 can be injected at a different
temperature than reservoir conditions, leading to significant density variation within the
plume over space and time. This impacts buoyancy and migration patterns, which becomes
particularly important for injection sites with temperature and pressure conditions near
the critical point. Therefore, coupling thermal processes with fluid flow should be
considered in order to correctly capture plume migration and trapping within the
reservoir.
A practical modeling approach for CO2 storage over relatively large length and time
scales is the vertical-equilibrium model, which solves partially integrated conservation
equations for flow in two lateral dimensions. We couple heat transfer within the vertical
equilibrium framework for fluid flow, focusing on the thermal processes that most
impact the CO2 plume. We investigate a simplified representation of heat exchange
between the plume and the reservoir that also includes transport of heat within the
plume. In addition, we explore CO2 thermodynamic models for reliable prediction of
density under different injection pressures, temperatures and composition. The
model concept is demonstrated on simple systems and applied to a realistic storage
aquifer. |
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