Sleipner was built in order to deal with the 1991 Norwegian CO2 tax. Sleipner obtains CO2 credit and does not have to pay the tax. The gas from the Sleipner field contains a high proportion of CO2 (15 per cent CO2), of which 12,5 per cent must be removed before Statoil can sell it. The final product that now is sold therefore contains 2,5 per cent CO2.
12 000 000 tonnes/CO2
Since 1996, Statoil has captured one million tonnes per annum of carbon dioxide from natural gas production at Sleipner West and stored it in an aquifer more than 800 metres below the seabed (Utsira formation). On Sleipner, CO2 is captured using a conventional amine process and stored in the geological layers. From 2014, capture and injection capacity is expanded from 1 Mtpa to 1.1-1.2 Mtpa. This is due to the fact that the Sleipner T-plattform from then on is separating CO2 from the gas stream at the Gudrun-field, which is injected in the Utsira formationas well.
Sleipner is the second largest gas producer in the North Sea (after Troll) and delivers gas to the continent and the UK. The Sleipner project is world famous because of its offshore CO2 capture.
Sleipner produces 300,000 barrels of oil equivalent and 36 million Sm3 of natural gas every 24 hours. At the beginning of 2011 almost 12 million tonnes of CO2 had been stored.
Other sources and press releases:
CO2 storage security (Feb 2007) [PDF]
Statoil has been capturing around one million tonnes of CO2 offshore at the Sleipner platform since 1996. The gas is stored more than 800 metres below the seabed in an aquifer. Statoil captures about 2600 tonnes of CO2 every day from the gas produced on Sleipner. The way the CO2 spreads underground at this storage site has been monitored by various research projects, which are funded in part by the European Union. The Utsira reservoir is continuously monitored using seismology, and comprehensive models have been developed for calculating how the CO2 moves in the reservoir.