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Abstract

Summary

Interfacial tension (IFT) and contact angle (CA) play a crucial role in determining CO trapping efficiency as they also impact capillary pressure and relative permeability of the CO2-brine systems. Accurate characterization of these parameters under reservoir conditions is essential for assessing wettability alterations and ensuring long-term CO storage stability.

This study investigates the influence of pressure, temperature, and salinity on the IFT and wettability of CO-brine systems in contact with carbonate formations. A drop shape analyzer was utilized to measure IFT and contact angle under reservoir pressure and temperature conditions. Pendant drop method was employed to evaluate IFT between CO and synthetic brine at elevated pressures and temperatures. Additionally, the sessile drop method was applied to determine the contact angle of CO/brine/rock systems.

The results indicate that IFT between brine and CO increases with temperature and salinity but decreases with increasing pressure due to enhanced CO solubility in brine. Similarly, contact angle values increase with pressure, temperature, and salinity.

These findings provide valuable insights into the fluid-fluid and fluid-rock interactions in carbonate reservoirs under geological storage conditions. This study underscores the significance of IFT and wettability modifications in influencing CO migration, trapping efficiency, and storage security.

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2025-09-01
2026-02-11
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