UK-based oil and gas firm EnCore Oil has announced that its Tudor Rose prospect located on the 14/30a-5 appraisal well has reached a total measured depth of 3,590ft in the Central North Sea.
The well in the 14/30a block encountered an oil column within the target Beauly Formation and Oil Water Contact at 3,236ft total vertical depth subsea. Wire line sampling and pressure testing of the hydrocarbon bearing zone has been undertaken.
Furthermore, initial well-site analysis of the samples suggest a viscosity of 600-800centipoise, which is too viscous to be commercially exploitable.
Encore said onshore analysis will be further required before the confirmation of the provisional evaluation. The well will now be plugged and abandoned.
EnCore CEO Alan Booth said the primary objective of the well is to establish the gravity and viscosity of the oil in place at Tudor Rose to determine if the oil may be capable of commercial exploitation and these provisional results suggest this is unlikely to be the case.
"Although the well took longer than expected due to the poor offshore weather conditions we are pleased that EnCore's final well prior to its acquisition by Premier Oil was drilled safely and without incident," added Booth.
Drilling operations on the 14/30a-5 appraisal well commenced on 16 November 2011 using the Transocean Sedco 704 semi-submersible rig and is being managed by Applied Drilling Technology International.
The primary objectives of the well are to obtain a core of the Beauly sandstone reservoir and to collect reservoir fluid samples to establish the API and viscosity of the oil.
EnCore Oil operates the 14/30a block with a 40% interest, while Endeavour Energy, EnQuest and Nautical Petroleum each hold a 20% interest in the block.