Norwegian company Det norske oljeselskap has completed the drilling of appraisal wells 16/1-22 S, 16/1-22 A and 16/1-22 B in the Ivar Aasen field in the central part of the North Sea.

The Maersk Interceptor drilling facility, which was used to drill the wells, would continue production drilling on the Ivar Aasen field upon installation of the platform jacket.

The well 16/1-22 S was drilled to investigate reservoir rocks and reservoir quality, in addition to obtaining depth control along the west flank of the field in Middle Jurassic to Upper Triassic reservoir rocks in order to optimise well sites.

Det norske oljeselskap drilled the wells 16/1-22 A and 16/1-22 B 1,000m north-east and 1,350m north respectively of 16/1-22 S to investigate reservoir rocks.

"The well 16/1-22 S was drilled to investigate reservoir rocks and reservoir quality."

The drilling was also aimed at performing additional data acquisition.

According to the company, the 16/1-22 S well encountered a 3m oil column, which is saturated with a gas/oil ratio of about 160Sm3/Sm3.

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The well 16/1-22 A encountered a total oil column of about 55m in the Skagerrak formation, 30m of which was in sandstone of varying reservoir quality, while the well 16/1-22 B encountered a total oil column of about 45m in the same formation.

On 21 December 2012, the company submitted plan for development and operation (PDO) of the Ivar Aasen field to the Ministry of Petroleum and Energy.

The wells 16/1-22 S, 16/1-22 A 16/1-22 B, which were terminated in the Skagerrak formation in the Upper Triassic, have been drilled to measured depths of 2,640m, 2,896m and 3,215m respectively, and vertical depths of 2,562m, 2,468m and 2,501m below the sea surface.

Image: The wells 16/1-22 S, 16/1-22 A and 16/1-22 B are located in the Ivar Aasen field. Photo: courtesy of Norwegian Petroleum Directorate.