The Sleipner Vest Field, which came on stream in 1996, is the largest gas/condensate field in the Sleipner area. Having a higher carbon dioxide content (9 mole%) than the gas export quality specifications of 2.5 mole% CO2, it was necessary (prior to development approval) to find some way of handling the excess CO2 without damaging the natural environment. An amine plant was installed at the Sleipner T platform to extract the CO2 from the reservoir gas, which was then injected and stored some 800-1000m below sea level and 2.5 km east of the Sleipner A platform in the Utsira Formation - a water-filled acquifer. Up until now (mid 2005), about seven million tonnes of CO2 have been injected. The stored CO2 has been monitored using time lapse seismic to confirm its behaviour and evaluate (i) whether any of it has migrated towards the Sleipner installations, potentially leading to corrosion problems for well casing; or (ii) whether any of it has leaked into the overburden seal, the ocean or the atmosphere. The results show that neither of these eventualities has occurred.

You can access this article if you purchase or spend a download.