Swedish Lundin has completed the drilling of appraisal wells 7220/11-4 and 7220/11-4 A on the 7220/11-1 (Alta) oil and gas discovery in licence 609, the offshore regulator Norwegian Petroleum Directorate said August 28. The wells were drilled about 2 km south of the discovery well 7220/11-1, 3km north-northeast of the appraisal wells 7220/11-3 and 7220/11-3 A and 190 km northwest of Hammerfest.

 

The discovery was proven in carbonate rocks in the Gipsdalen group in October 2014. Before the 7220/11-4 and 7220/11-4 A wells were drilled, the operator’s resource estimate for the discovery was between 20 and 64 million m³ of recoverable oil equivalents (or 17-54mn mt/ 130mn-400mn boe.)

 

 

 

The objective of well 7220/11-4 was to delineate the eastern flank of the discovery by investigating the reservoir extent of conglomerates of the Late Permian to Early Triassic Age, Late Carboniferous to Early Permian carbonate rocks (Orn formation), hydrocarbon columns and the quality of Carboniferous reservoir rocks (Falk formation).

 

The reservoir quality through the oil column varied in both wells. Several zones have very good permeability. The hydrocarbon contacts were the same in both wells. The maximum production rate was 960 m³ oil and 93,000 m³ gas/day through a 56/64-in choke. T

he test confirmed very good reservoir properties and good lateral continuity in the conglomerate reservoirs. The results from the appraisal wells are important with regard to the further work on mapping the eastern flank of the discovery. 

 

 

 

 

The resource estimate will be reassessed based on the results from the appraisal wells, the tenth and eleventh exploration wells in in Licence 609. The wells were drilled by the Leiv Eiriksson drilling facility, which will now proceed to drill wildcat well 7220/6-3 in the northern part of production licence 609.