Lundin Petroleum has successfully completed the appraisal well 16/1-28S and production test on the Rolvsnes discovery on the Utsira High in the Norwegian North Sea.
The main objective was to confirm commercial rates from a horizontal well drilled in fractured and weathered basement reservoirs, similar to those currently producing in the northern area of the Edvard Grieg field.
Lundin highlights the following:
- Good productivity and connectivity from fractured and weathered basement reservoir has been confirmed
- Substantial increase in resources. Gross resource range has increased to between 14 and 78 MMboe from previously 3 to 16 MMboe
- De-risks additional on-trend basement prospectivity, including the Goddo prospect which is estimated to contain gross potential resources of more than 250 MMboe
The well was drilled horizontally in the reservoir interval and encountered 2,500 metres of fractured and weathered basement.
Extensive data acquisition and sampling have been carried out in the reservoir, including a 10 day production test with production logging and bottom hole fluid sampling. A maximum constrained production rate of 7,000 bopd was achieved, while the 5 day main flow period was held at a production rate of 4,200 bopd.
The test results show good reservoir productivity and connection to a significant oil volume that benefits from aquifer pressure support, which are positive factors towards demonstrating commercial recovery at Rolvsnes.
Following these positive well results, the gross resource range for the Rolvsnes discovery has been increased to between 14 and 78 MMboe from the previous range of between 3 to 16 MMboe.
The long-term production behaviour from this reservoir type needs to be understood better and options are being assessed to conduct an extended well test of the horizontal appraisal well. Rolvsnes is considered a potential tie-back development to Edvard Grieg.