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Description
Geological CO2 storage and enhanced oil recovery (EOR) are essential to addressing the global energy needs and preventing climate change. This research examines the polymer-enhanced CO2 foam (PEF) as a superior technique in EOR and CO2 sequestration. Traditional CO2 foams are limited by their quick instability and inability to be controlled in mobility during severe reservoir conditions, which are often also high temperature (80°C) and high salinity (approaching 15,000 mg/L). This research paper analyzes the performance of polymer-enhanced CO2 foam (PEF) in improving the mobility control and oil recovery under simulated reservoir conditions. The PEF system was developed with 0.1 wt% anion-based Alpha Olefin Sulfonate (AOS) surfactant and 0.5 wt% hydrolyzed polyacrylamide (HPAM) in 4.0 wt% NaCl brine. Core flooding experiments were conducted at 10 bar and 60°C with a foam quality of 70% on four sister core samples with porosities ranging from 17.68% to 20.10% and gas permeabilities ranging from 1.25 to 1.60 mD. Experimental analysis revealed that the recovery factor with traditional CO2 foam was 58.0 percent at an injection rate of 3 ft3/day (the highest differential pressure was 10.39 psi) and 64.5% at 6 ft3/day (13.00 psi). Conversely, the polymer-enhanced foam recovered 68.3% and 69.8% at 3 ft3/day and 6 ft3/day with 10.04 psi and 17.15 psi differential pressures, respectively. These results show the possibility of PEF to enhance the sweep efficiency and stability in EOR operations, as well as a contributing factor in the successful sequestration of CO2.
| Country | Kazakhstan |
|---|---|
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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