Denmark’s plan to store carbon beneath the Danish North Sea has taken a significant step forward.

Maersk Drilling confirmed Wednesday the Greensand carbon capture and storage (CCS) project had cleared its first major hurdle, with DNV GL deeming carbon dioxide injection into the intended subsea reservoir as feasible.

DNV’s certification confirms the Nini West reservoir is conceptually suitable for injecting about 450,000 tonnes of CO2 per annum per well over a 10-year period, with the reservoir expected to be able to safely contain the CO2 in compressed form.

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This certification by DNV GL, combined with endorsement of Danish authorities, means the first phase of validation of the Greensand project has been completed.

Next steps

“We’re thrilled to get this independent certification that Nini West is suitable for injection and long-term safe storage of CO2, just like the reservoir previously contained hydrocarbons for millions of years,” said Maersk Drilling’s head of innovation, Marika Reis.

“As part of the next phase of validation, we will be applying DNV GL’s certification scopes for suitability of the CO2 injection well design and well construction process.”

Project Greensand targets having the first well ready for injection from the Ineos-operated Nini platform in 2025, while the longer term ambition of the project is to develop the capacity to store roughly 3.5 million tpa of CO2 before 2030.

Maersk, Ineos and Wintershall Dea formed a CO2 storage consortium earlier this year and their Greensand project is aimed at building infrastructure and capabilities that will allow CO2 captured in onshore facilities to be transported offshore for injection and storage beneath the seabed.

The feasibility study to validate reservoir compatibility forms the first phase of the project and will be followed by a pilot to test CO2 injection.

The Geological Survey of Denmark and Greenland (GEUS) will act as a research partner to the project, conducting specialised laboratory experiments and results analysis.