Norway-based Statoil Petroleum is set to complete drilling of wildcat 30/11-12 S and appraisal well 30/11-12 A in the North Sea.

The company used the Songa Delta drilling facility, with one well 2km south of the 30/11-9 A (Askja Øst) discovery, and the second 35km south-west of the Oseberg Sør facility in the North Sea.

Drilling of the 30/11-12 S well was aimed at proving petroleum in three sandstone layers in Middle Jurassic reservoir rocks also known as the Tarbert formation. While the objective of the 30/11-12 A well was to delineate if a discovery was made in 30/11-12 S.

At the time of drilling, 30/11-12 S encountered a 37m oil column in the upper part of the Tarbert formation, with 30m proven to have good to moderate reservoir properties.

When drilled further down on the structure, well 30/11-12 A encountered similar reservoir rocks and remained dry.

Based on preliminary estimates, the size of the discovery is expected to be between 0.7 and 2.5 million standard cubic metres of recoverable oil equivalents.

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"The discovery is planned to be included in the evaluation of a new field development."

The discovery is planned to be included in the evaluation of a new field development.

Statoil collected data and samples in wells 30/11-12 S and 30/11-12 A.

The wells were drilled to vertical and total depths of 3,669m and 3,671m respectively, 3,609m and 4,144m below the sea surface. They are the 12th and 13th exploration wells in production licence 035, originally awarded to the company in the second licensing round in 1969.

Well 30/11-12 S was terminated in the Ness formation, while 30/11-12 A was abandoned in the Tarbert formation. The company permanently plugged and abandoned both the wells.

The Songa facility will continue its drilling campaign with the drilling of wildcat well 30/11-13 S in the same production licence operated by Statoil.

Image: Statoil drilled the wells 2km south of the 30/11-9 A (Askja Øst) discovery, and 35km south-west of the Oseberg Sør facility. Photo: courtesy of Norwegian Petroleum Directorate.