Extension of CO2 storage life in the Sleipner CCS project by reservoir pressure management

In this study, we performed reservoir simulations to investigate CO₂ storage in the saline aquifer in Sleipner by reservoir pressure management. Results show that by producing water at the lowest aquifer structure far away from the CO₂-water contact in the vertical direction, an additional 73% (24 Mt) CO₂ can be stored compared to the case without water production. This extra CO₂ stored can generate a revenue of $800 millions at the prevailing carbon tax of $69 per ton in Norway. There is 5.31 Mtpa of natural CO₂ production from 124 gas and oil fields in Norway in 2020. Of these, the Marulk, Dvalin, Skarv, Morvin, Åsgard, Kristin, Tyrihans and Mikkel fields in the Norwegian Sea, and the Kvitebjørn, Valemon, Visund, Gudrun fields in the North Sea produce a total of 4.55 Mtpa CO₂ potentially supplying CO₂ to Sleipner for project life extension.