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Abstract

Summary

Underground geothermal resources (sedimentary or volcanic) corresponding to closed systems limited by impermeable cap rocks are typically utilized to extract heat at surface through the circulation of hot water and/or steam. Replacing the naturally occurring working fluid with CO2 offers a number of advantages such as lower fluid density, similar thermal capacity, better mobility and the so-called thermosiphon effect which minimizes the cool fluid reinjection cost. Most importantly, a great amount of CO2 will be permanently stored and circulated thus offering the CCS advantage. However, unlike conventional geothermal development plans, special attention needs to be paid during the CCS phase so as to combine CO2 injection with water withdrawal at proper rates to avoid CO2 early breakthrough and recycling. The specific policies needed to be employed to achieve the required result are discussed in this work followed by simulation examples demonstrating the application.

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/content/papers/10.3997/2214-4609.202330045
2023-12-04
2025-03-24

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References

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/content/papers/10.3997/2214-4609.202330045
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Combining Geothermal Energy Extraction to CCS to Maximize Resource Utilization
Conference Proceedings 2023, 1 (2023); https://doi.org/10.3997/2214-4609.202330045
/content/papers/10.3997/2214-4609.202330045
/content/papers/10.3997/2214-4609.202330045
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