LONDON -- EnCore Oil has discovered oil with an exploration well on the Catcher prospect in UK central North Sea block 28/9. Partner Premier Oil estimates reserves in the range 25-50 MMbbl.
Well 28/9-1 well was drilled to a 5,219 ft (1,590 m) MD, after encountering high-quality, oil-bearing reservoir sandstones at 4,600 ft (1,402 m) at the targeted Cromarty Sandstone level. The well intersected a potential oil/water contact at 4,840 ft (1,475 m).
Early analysis indicates an oil column of at least 240 ft (73 m), with net pay of 90 ft (27 m). EnCore has commissioned sampling and pressure testing of the hydrocarbon-bearing zones, results suggesting light oil with an API of around 31º.
Analysis of logs to date also reveals high-quality sands with porosities of around 34%, and EnCore expects these sands to have multi-Darcy permeabilities.
The partners are preparing to perform a drillstem test in order to compile flow rate characteristics and sufficient oil samples for development studies. The testing program should take around 10 days.
Depending on the results, the partners would aim to drill a sidetrack to test the Catcher East area to test a similar amplitude-supported segment, but within the stratigraphically younger Tay formation. Thereafter, they may also sanction a further sidetrack west of the current location to improve understanding of reservoir development in this area.
EnCore operates with a 15% interest in the license, in partnership with Premier Oil (35%), Wintershall (20%), Nautical Petroleum (15%), and Agora Oil & Gas (15%).