Speaker
Description
Pore-scale multiphase investigations for enhanced oil recovery (EOR) and underground gas storage determine macroscale permeability and injection efficiency. The displacement dynamics at microporous media are characterised by fluid-fluid and fluid-rock interactions along with momentum balance equations. This study presents pore-scale numerical investigations under varying reservoir properties to elucidate carbon dioxide (CO2) enhanced oil recovery and trapping mechanisms. Multiple reservoir scenarios, ranging from 6 to 30 MPa pressure, were considered, which show a transition from immiscible to miscible flow regimes. Additionally, the role of fluid rock interactions was evaluated through numerical simulations.
For immiscible regimes, a three-phase volume of fluid (VOF) model was simulated with distinct interfacial tension (IFT) between the phases. However, to model the miscible flow dynamics, the species transport equation is coupled with the VOF multiphase model.
The hydrodynamic simulations show that mass diffusivity under high-pressure miscible conditions reduces capillary pinning, increasing oil recovery and decreasing residual brine significantly inside the porous domain. Furthermore, the study captures the sensitive analysis of the displacement dynamics for varying wettability and capillary number scenarios. CO2 trapping mechanisms, snap-off events for different cases, were discussed. The study highlights optimisation of oil recovery and CO2 sequestration in complex three-phase porous reservoir systems.
| Country | India |
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