LONDON -- Sterling Resources’ Cladhan appraisal well 210/30a-4y – the third of a four well program in UK central North Sea blocks 210/29a and 210/30a – has reached TMD of 12,615 ft (3,845 m).
According to partner EnCore Oil, the well was drilled as a side track into the Central Channel prospect, south of the Cladhan discovery. It encountered two Upper Jurassic reservoir sand sequences with a gross true vertical thickness (TVT) of 191 ft (58 m) and net of 40 ft (12 m) TVT.
Log and pressure data suggest that the sands are water wet, and are in a separate pressure regime from the main Cladhan accumulation.
The group plans to spud the final side track of this drilling phase, around 150 ft (45.7 m) updip of the previous oil bearing 210/30a-4 well, the aim being to derive further information on the southern sector of the Northern Channel area where the original Cladhan discoveries are. This side track should take 15-20 days to complete.
EnCore CEO Alan Booth said: "Although the over-pressured nature of the reservoir suggests there may be remaining prospectivity updip from the current Central Channel well, this would likely need to be the subject of a future drilling campaign.
“This well and the previous 210/30a-4z deep well in the fan area have not impacted on the established Cladhan discovery. However, the results start to limit the upside potential on the licence as a whole, and suggest that the Cladhan field is likely confined to the Northern Channel belt area and an area up dip of the deep fan well.”
The partners plan to perform an infield survey and a pipeline survey to determine the best development options, he added.