Statoil to complete drilling of Dagny field in the North Sea

Mar 09, 2011 12:00 AM

Statoil Petroleum, operator of production licence 303, is in the process of completing the drilling of appraisal wells 15/6-11 S and 15/6-11 A on the gas/condensate/oil discovery 15/5-1 Dagny.
The Dagny discovery was proven in the 1970s in Middle Jurassic reservoir rocks just north of the Sleipner Vest field. The discovery was further delineated in 2007 by the appraisal well 15/6-9 S on the “Ermintrude” structure.

Before the last wells were drilled, the resource estimate for Dagny was between 15 and 50 mm cm of recoverable oil equivalents. The wells were drilled approx. 4 and 2 km south-east of the discovery well 15/5-1 Dagny.
The purpose of the wells was to prove, delineate and test the production properties of the oil zone in Middle Jurassic reservoir rocks (the Hugin formation) between Dagny and “Ermintrude”.

Appraisal well 15/6-11 S, which was drilled to the deepest point of the structure, encountered only non-mobile petroleum in the Hugin formation with varying reservoir quality.
Appraisal well 15/6-11 A, which was drilled to a shallower point of the structure, encountered a gas column of 30 metres in the Hugin formation in reservoir rocks with quality corresponding to that of 15/6-11 S.

Comprehensive data acquisition and sampling have been carried out. A successful formation test was conducted. The maximum production rate was 225,000 mm cm gas and 120 mm cm condensate respectively per flow day through a ½-inch nozzle opening.
The extent of the Dagny discovery is currently estimated at between 20 and 40 mm cm recoverable oil equivalents. The licensees are considering various concepts for the Dagny discovery and how the information from the latest wells will affect their choice of concept and schedule.

The wells were drilled on behalf of production licences 048, 303, 029 and 029 B. These are the fifth and sixth exploration wells in production licence 303, which was awarded on 12 December 2003 (APA 2003). 15/6-11 S and 15/6-11 A were drilled to vertical depths of 4,099 and 3,830 metres below sea level, respectively, and were both terminated in the Skagerrak formation in the Upper Triassic. The wells are/will be permanently plugged and abandoned.
Wells 15/6-11 S and 15/6-11 A were drilled in 116 metres of water using the drilling facility Ocean Vanguard, which is now headed for production licence 272 in the northern part of the North Sea to drill wildcat well 30/11-8, where Statoil Petroleum is the operator.

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