Sterling Resources Ltd., Calgary, drilled a successful Cladhan downdip sidetrack on Block 210/29a in the UK North Sea 225 miles northeast of Aberdeen.
By OGJ editors
HOUSTON, Oct. 4 – Sterling Resources Ltd., Calgary, drilled a successful Cladhan downdip sidetrack on Block 210/29a in the UK North Sea 225 miles northeast of Aberdeen.
The 210/29a-4y sidetrack of the discovery well went to 11,530 ft measured depth in 225 ft of water to a downdip location 3,580 ft southeast of the original well and 2,690 ft due east of the updip sidetrack bottomhole location.
The second sidetrack cut more than 60 ft vertical thickness of net hydrocarbon bearing sandstones. Wireline logs, downhole sampling, and pressure recording have yet to be completed to confirm data from the measurement and log while drilling tools.
Preliminary analysis indicates good quality sand with 20% average porosity. The well did not encounter an oil-water contact. Lowest known oil occurred at 11,333 ft MD, which if confirmed by pressure measurements will establish a minimum 425-ft oil column.
The 210/29a-4z sidetrack was drilled in August to an updip location 3,150 ft due south of the discovery well to a TD of 11,215 ft MD. It encountered a 159-ft gross hydrocarbon column with 102 ft of net hydrocarbon-bearing sandstones and was tested at a restricted 5,903 b/d of 34° gravity oil with 1,874 psig wellhead pressure of 1,874 psig.
Sterling is operator of Cladhan License P1064 with 39.9% working interest. Wintershall (UK North Sea) has 33.5%, Encore Petroleum Ltd. has 16.6%, and Dyas UK Ltd. has 10%.