Lundin Norway, a wholly-owned subsidiary of Swedish oil firm Lundin Petroleum, has completed the extended production test of Alta appraisal well 7220/11-5 in PL609 in the Barents Sea, offshore Norway.
The primary aim of the 7220/11-5 S appraisal well and extended production test was to prove sustainable production rates.
The appraisal well was horizontally drilled to 700m through to a karstified and fractured carbonate reservoir, which is a first on the Norwegian Continental Shelf.
Situated around 4km south of the original Alta discovery well, the appraisal well is the fifth well drilled on the Alta discovery. Leiv Eiriksson, a semi-submersible drilling rig, was deployed for drilling and testing at Alta.
The drilling demonstrated that reservoir properties were found to be better than anticipated.
The extended production test lasted for almost two months. It included a period of 30 days with a constrained rate of around 7,500 barrels of oil per day (bopd) and the second period of 25 flowing days of up to 18,000 bopd.
A total of about 675,000 barrels of oil was produced during the entire test.
Lundin Petroleum president and CEO Alex Schneiter said: “I am very pleased to announce the successful completion of the appraisal well and extended production testing at Alta.
“We have significantly advanced our understanding of this complex carbonate reservoir, the development of which would be a first for Norway. We will now concentrate our efforts on further defining the route to commercialisation and progressing development concept studies.”
During the test, extensive sampling and data acquisition, such as on production logging, have been carried out. The outcome demonstrated excellent reservoir productivity with contribution from all reservoir intervals and connectivity to a large volume.
Before the extended production test was carried out, the collective gross resource range for the Alta and Gohta discoveries was estimated to be anywhere between 115 and 390 million barrels of oil equivalent.
The resource range for the Alta and Gohta discoveries will be updated in early 2019 when all new data collected from the well, as well as the recently available latest generation 3D seismic survey (TopSeis) are processed.