1887

Abstract

Summary

Storing CO2 in geological formations, especially deep saline aquifers, plays a vital role in carbon capture and storage (CCS), with significant potential to reduce greenhouse gas emissions. However, these aquifers with their high salinity impose the risk of salt precipitation on the process, which can cause pressurization and reduce injectivity. This study is focused on the topic of salt precipitation mitigation as developing such a strategy remains a challenge. This work proposes dissolved-water CO2 injection (dwCO2 injection) as an innovative method to prevent salt precipitation by dissolving water into CO2 prior to injection. The water presence in the CO2 stream prevents further water dissolution into CO2 (evaporation) and thus prevents salt precipitation. Two injection scenarios are examined using CMG-GEM commercial compositional simulator to evaluate the proposed method: a case with dry CO2 and another case with humid CO2. Results demonstrated that saturating CO2 with water nearly eliminated precipitation, while dissolving 2,000 ppmv water reduced salt precipitation by one-third.

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/content/papers/10.3997/2214-4609.202521054
2025-10-27
2026-01-19

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/content/papers/10.3997/2214-4609.202521054
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Dissolved-Water CO2 Injection as a Salt Precipitation Mitigation Strategy in CO2 Storage Processes in Saline Aquifers
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202521054
/content/papers/10.3997/2214-4609.202521054
/content/papers/10.3997/2214-4609.202521054
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