Test Results: Sterling expects 15,000 BOPD from Cladhan oil field in the UK North Sea

Source: EnCore Oil

Testing operations on the Cladhan appraisal well in UK Northern North Sea Block 210/29a proved a strong flow rate for the oil field. 

The Cladhan appraisal well, 210/29a-4Z flowed at a stable rate of 5,903 bopd (barrels of oil per day) for over 13 hours through a 28/64 inch choke with a final wellhead pressure of 1,874 psi (pounds per square inch). The flow rate was restricted by the capacity of surface facilities and due to the small diameter of the testing tools and the 3.5 inch tubing used while testing. 

The Operator, Sterling Resources, has indicated that with larger 4.5 inch completion tubing, they estimate that the well is capable of producing over 15,000 bopd. The testing confirmed light oil with a gravity of approximately 34 degrees API and a gas oil ratio (GOR) of 245 scf/bbl.

After completing the well test operations, the well will be plugged back and a further side-track downdip and to the southeast of the original discovery well will be drilled to better understand the location of the oil water contact (OWC) in the field. The side-track operation will commence later this week and is expected to take approximately two weeks subject to weather and operational delays.

"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,” said EnCore’s CEO Alan Booth. “We look forward to the results of the side-track well which we hope will enable us to define the location of the OWC.”

Cladhan is located 225 miles north east of Aberdeen in 536 feet water depth.

The equity in the Cladhan joint venture partnership is as follows: EnCore Oil plc (16.6 percent), Sterling Resources Ltd (39.9 percent, Operator), Wintershall (UK North Sea) Limited (33.5 percent) and Dyas (10 percent).

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