Cost-Effective Carbon Sequestration: Evaluating Liquid vs. Supercritical CO2 in Deep Aquifers

Document Type

Conference Proceeding

Publication Date

1-1-2025

Abstract

The transportation and injection of CO2 are critical components in the carbon capture and storage (CCS) chain. While transporting CO2 in the liquid phase allows for higher volumes, supercritical CO2 (SC-CO2) is generally preferred for pipeline transportation due to its unique (combined) properties of SC-CO2, reducing energy requirements for its injection. However, alternatively, injecting cold, liquid CO2 can offer potential benefits, including enhanced brine displacement efficiency and reduced CO2 buoyant migration through the caprock due to its higher density, but this would require additional energy for cooling. This study aims to study the implications of injecting liquid vs SC-CO2 based on economic and technical points of view. We evaluate and compare the cost and performance implications of CO2 injection for economic feasibility at three injection temperatures: i) 5 ºC, ii) 25 ºC, iii) 35 ºC. For this, we take into account that the average energy prices in Louisiana are 0.161 USD/kWh according to the U. S. Bureau of Labor Statistics. The technical point of view is performed by conducting numerical simulations using TOUGH3 to analyze the injection process and subsurface behavior.

Publication Source (Journal or Book title)

Society of Petroleum Engineers SPE AAPG Seg Carbon Capture Utilization and Storage Conference and Exhibition Ccus 2025

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