The Rosebank project followed an oil and gas discovery at the offshore Rosebank/Lochnagar well in the Faroe-Shetland Channel close to the UK/Faroes median line and 126 km from the nearest coastline (Esha Ness on Shetland). The well, located in 3,600 ft of water and with a total depth of 12,153 ft, encountered two oil and gas accumulations for a total net pay of 169 ft.
Rosebank project site details and facilities
The discovery could hold 530 MMbbl of recoverable oil of quality ranging between 27° API and 36° API. The Rosebank Palaeocene reservoir is long and shallow, measuring 20 km in length and 5 km wide.
It comprises oil and gas-bearing sandstones interbedded with layers of volcanics, proven in each of the four wells drilled to date. The geological make-up causes seismic imaging difficulties, making it hard to distinguish between reservoir, shale and volcanics.
The field will be developed by a turret moored FPSO, which will be able to produce 100,000 barrels of oil and 190 million standard cubic feet of natural gas per day. It will also have a storage capacity of 1.05 million barrels of oil. The 99,750-tonne FPSO will be built under the NORSOK standard. The development will comprise 14 wells, in four to six subsea clusters, tied back to a ship-shaped FPSO, located around 6km away.
The project will utilise a flexible riser system. The project will also include a 16-inch 236km gas export pipeline connecting Rosebank to the Shetland Islands Regional Gas Export line and on to St Fergus. The field will be developed in up to three drilling stages, with drilling taking place from four drill centres. It is likely seven oil producers and seven water injector wells will be drilled in phase 1.
Phase 2 will see six oil producers drilled with one or two water injectors, while the phase 3 development will consist of one or two gas production wells. The total oil production from Rosebank is expected to peak at 98,198 b/d in 2019, whereas total gas production is expected to peak at approximately 3.8 million scm/d in 2022.
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