North Sea Johan Sverdrup well removes reservoir concerns
Statoil is about to complete its latest appraisal well on the Johan Sverdrup field in license PL265 in the Norwegian North Sea.
Results look good, according to partner Det norske oljeselskap, dispelling uncertainty over reservoir quality in the area bordering the field’s main western boundary fault.
The latest well was drilled to determine reservoir properties and thickness in this part of central Johan Sverdrup. It encountered an 82-m (269-ft) gross oil column, the largest over the entire field to date.
There was a good-quality 38-m (124-ft) thick interval within the main Upper Jurassic reservoir, with thin, shale-laden intervals in the Middle/Lower Jurassic. The oil/water contact was at the same level as in neighboring wells on the center of Johan Sverdrup.
One drillstem test (DST) flowed 420 cu m/d (14,832 cu ft/d) of oil through a 40/64-in. choke from the Middle/Lower Jurassic sandstone interval, while a second DST in the Upper Jurassic produced 920 cu m/d (32,489 cu ft/d) through a 48/64-in. choke.
An 800-m (2,624-ft) western side track (16/2-17 B) will follow, designed to probe any oil potential on the basement high Cliffhanger South structure immediately west ofJohan Sverdrup.