Speaker
Description
The near-wellbore region plays a crucial role in determining production and injection conditions, directly impacting operational efficiency. Skin, as a dimensionless parameter representing wellbore damage or stimulation, critically alters petrophysical properties and thus injectivity. The injection of reactive fluids, such as supercritical CO2, poses additional challenges due to its capability to modify rock-fluid interactions, particularly within heterogeneous reservoirs like those found in the Brazilian Pre-Salt formations. Understanding the dynamic influence of skin in such conditions is vital for optimizing CO2 storage and enhancing injection efficiency.
This study investigates the impact of varying skin conditions on CO2 injectivity and storage capacity over a 25-year simulation period. A heterogeneous reservoir model was used, incorporating realistic properties from the Brazilian Pre-Salt region. Skin factors ranged from -5, indicating well stimulation, to +5, reflecting severe damage. The simulations evaluated the correlation between skin and reservoir
pressure, assessing their combined effects on fluid injectivity and storage potential.
The results highlight that positive skin values (damage) significantly impede injectivity, reducing the total volume of CO2 that can be stored in time. The associated pressure buildup in injection wells can exceed operational thresholds, posing risks to equipment integrity and overall project feasibility. In contrast, negative skin values (stimulation) improve fluid acceptance, demonstrating increased injectivity and storage efficiency. This finding underscores the importance of mitigating wellbore damage and employing stimulation techniques to achieve optimal performance in CO2 storage projects.
These results can assist with managing CO2 injection operations in heterogeneous reservoirs. By addressing skin-related challenges, operators can better control injection pressures and maximize storage efficiency, contributing to the global effort to reduce greenhouse gas emissions through effective carbon sequestration.
| Country | Brazil |
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