Cladhan set for further side track

Sterling Resources has issued the result of testing operations on its Cladhan appraisal well in the UK northern North Sea, 225 mi (362 km) northeast of Aberdeen in 536 ft (163 m) water depth.

Offshore staff

LONDON -- Sterling Resources has issued the result of testing operations on its Cladhan appraisal well in the UK northern North Sea, 225 mi (362 km) northeast of Aberdeen in 536 ft (163 m) water depth.

Well 210/29a-4Z flowed at a stable rate of around 5,903 b/d of 34º API oil for over 13 hours through a 28/64-in. choke, with a final wellhead pressure of 1,874 psi.

According to partner EnCore Oil, flow rate was restricted by the capacity of surface facilities, the small diameter of the testing tools, and the 3½-in tubing used during testing. With a larger 4½-in. completion tubing, the well should be capable of delivering over 15,000 b/d.

After well test operations have been completed, the well will be plugged back and a further side track drilled downdip and to the southeast of the original discovery well to better define the oil/water contact. The side track should take a fortnight to complete, subject to weather and operational delays.

EnCore CEO Alan Booth said: “The quality and deliverability of the Cladhan reservoir has been further confirmed by this excellent test result. Until we can establish the depth of the OWC, it will be difficult to accurately define the size of the Cladhan accumulation although we believe that it is very likely that a commercial accumulation at Cladhan has already been established.

“At Catcher in UKCS central North Sea block 28/9, we are finalizing the well locations with our partners following the acquisition of site surveys which are now almost complete. The necessary technical, drilling, and safety evaluations for the use of the Transocean Galaxy II heavy duty jackup rig are continuing and, subject to regulatory approvals, we hope to return to drilling at Catcher in late September/early October for a program of between two and four wells.

“The turnkey contract with ADTI for use of the Galaxy IIrig is being negotiated and it should be ready for signature once the necessary approvals have been received.”

09/13/2010

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