1887

Abstract

Summary

Offshore oil and gas fields are normally operated with energy produced by gas turbines with large CO2 emission representing as high as 70–80% of the total emission from a platform. It is challenging reducing these emission due to lack of alternative energy sources and lack of space for implementing CO2 capture solutions.

This paper will describe AquaCCUS, a CCUS solution especially attractive for offshore oil and gas fields. It is designed with small footprint and benefit from seawater for cost effective CO2 capture and storage at the same location, in combination with CO2-EOR.

AquaCCUS is based on an innovative and patented process (PI-CO2) with seawater to separate CO2 from flue gas and using pressure swing principle to produce CO2 rich seawater, termed as carbonated water (CW), which can be injected back to reservoir at the same field or other nearby reservoirs, depending on the available water injection system. The whole value chain can be established for standalone field or more efficiently in a cluster of fields with tie-ins where CW can be utilised for EOR or for permanent storage, or both.

The AquaCCUS consists of a seawater column down to the available sea floor depths or around 200 meters where the partial CO2 pressure reaches its maximum dissolution of around 5%. The makeup water may come from the treated raw sea water or existing injection water system. The CW downstream AquaCCUS will be fed into water injection system to water injector(s). The most attractive benefits of AquaCCUS are small footprint, no use of absorbing chemicals, flexible to implement and competitive in energy efficiency. A high level estimate using AspenHysys modelling indicates also potential further energy reduction by an water column (PI-TROMP®) for more efficient flue gas compression and heat recovery from the hot flue gas from gas turbines.

AquaCCUS solution was first introduced at GHGT15 and evaluated for offshore use at GHGT16. The motivation of using CW for EOR is based on the facts of limited amount of CO2 for offshore EOR and the large injected water volumes commonly used for many oil fields for pressure maintenance. Earlier research has also confirmed CO2-EOR potential from CW in addition to the effect of slowing down CO2 back production as it follows injection water travel paths, thereby most likely be permanently stored in the reservoir.

This paper will show some possible examples and identify future research and innovation need for field implementation.

© EAGE Publications BV
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2025-04-02
2026-01-14

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CO2 Emission Reduction on Offshore Platforms
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202531073
/content/papers/10.3997/2214-4609.202531073
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