“We are expecting to increase the recovery rate on Oseberg East from around 20% to up to 30% when we drill the first planned wells,” said Statoil’s operations chief for Norway development and production.
“We also have the possibility of drilling more wells and further increasing the recovery rate towards 40%, which is almost double the rate in the plan for development and operation.”
The company expects the planned recovery boost to double the lifetime of the North Sea field, brought on stream in 1999, that lies 25 kilometres north-east of the Oseberg field centre.
The satellite oil and gas field originally held 168 million barrels of oil equivalent in recoverable reserves and had about 43 million boe in remaining volumes left in the reservoir at the end of last year, according to data from the Norwegian Petroleum Directorate.
Statoil said the use of the Safe Scandinavia would boost storage capacity for fluids and cuttings, enabling longer wells to be drilled and increasing the efficiency of the drilling effort, scheduled to start in the summer of 2015.
The company has fixed the unit on an initial three-year deal worth $443 million, with four one-year extension options. Work to convert the flotel will be carried out at Norwegian outfitting yard Westcon.
The Oseberg East field in Statoil-operated production licence 053 is being produced using a drilling, accommodation and production platform.
However, its layered reservoir, with limited communication between the layers, makes recovery more challenging than at other Oseberg fields.
Statoil operates the field with a 49.3% stake, with partners Petoro (33.6%), Total (14.7%) and ConocoPhillips (2.4%).