Analysis of intermediate cooling systems for CO2 compression trains of offshore oil wells

André de Carvalho and Alexandre K. da Silva

Energy, 2024, vol. 307, issue C

Abstract: A multi-stage compression train with intermediate cooling used to inject carbon dioxide (CO2) in a well is modeled using two distinct configurations, direct and assisted cooling. The main difference between these configurations is that, in the latter, the process water responsible for the intermediate cooling is cooled down by a refrigeration cycle. These configurations are thermodynamically modeled while aiming to investigate the effect of key parameters on two main variables: (i) the overall global conductance and (ii) the overall power consumed by the compressors and auxiliary cooling systems. The results for direct cooling indicate that the power consumed by the compression train is inversely related to the global conductance, while an increase in the number of intermediate compression stages also reduces the global conductance. The assisted cooling, which considered 20 different working fluids for the refrigeration cycle, presented a minimal value for the global conductance for a given value of the overall power consumed by the compressors (train and refrigeration cycle). Finally, a comparison between both configurations reveals that while direct cooling offers a better compromise solution between global conductance and power consumption, assisted cooling can produce a significant reduction of global conductance.

Keywords: Compression train; Oil well; Refrigeration cooling; Heat exchanger inventory; Carbon capture; CO2 injection (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:307:y:2024:i:c:s0360544224025544

DOI: 10.1016/j.energy.2024.132780

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