Enhanced oil recovery with CCS: Uses CO₂ injection to improve hydrocarbon recovery.
Enhanced Oil Recovery (EOR) utilizing captured anthropogenic CO₂ is a process where CO₂ is injected into mature oil fields to increase oil production while simultaneously storing the CO₂ in the reservoir. In the US, this practice has a long history, traditionally using naturally-sourced CO₂.
However, the modern concept ties EOR to CCS by requiring the use of industrial-sourced CO₂ (anthropogenic CO₂) to generate a climate benefit. The CO₂ injected for EOR is largely sequestered, often with a significant portion remaining permanently underground. This method provides an early commercial pathway and a revenue stream (from the recovered oil) that helps offset the high initial cost of capture, thereby accelerating the development of the necessary CO₂ capture and pipeline infrastructure.
FAQs:
Q: What is the primary role of EOR in the early development of the US CCS market?
A: Providing a commercial, revenue-generating use for captured CCO₂ to offset initial capture and infrastructure costs.
Q: What is the key distinction for EOR to qualify as EOR with CCS for climate benefits?
A: It must utilize anthropogenic CO₂ (captured from industrial or energy sources) rather than naturally occurring CO₂.
Q: What happens to the CO₂ injected into the oil field after the EOR process is complete?
A: A significant majority of the injected CO₂ is retained and permanently sequestered in the depleted reservoir.
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