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Tullow drilling update: North Sea wildcat well

Oilfield Technology,

Tullow Oil Norge AS, operator of production licence 550, is about to complete drilling of wildcat well 31/2-21 S. The well was drilled approximately 12 km northwest of the Troll C platform in the North Sea.

The primary exploration target for the well was to prove petroleum in Upper Jurassic reservoir rocks (Draupne formation). The secondary exploration target was proving petroleum in Upper and Middle Jurassic reservoir rocks (Sognefjord, Fensfjord, Krossfjord formations and the Brent Group).

The well did not encounter reservoir rocks in the Draupne formation. In the secondary target, reservoir rocks were encountered in the Sognefjord, Fensfjord, Krossfjord formations and the Brent Group. The reservoirs are of good quality, however are water-filled. The well is dry. Data acquisition has been carried out.

This is the first exploration well in production licence 550. The licence was awarded in 2009.

The well was drilled to a vertical depth of 3217 m below the sea surface and terminated in Lower Jurassic reservoir rocks (Cook formation). The water depth is 348 m. The well will now be permanently plugged and abandoned.

Well 31/2-21 S was drilled by Borgland Dolphin which will now proceed to production licence 558 in the Norwegian Sea to drill wildcat well 6507/5-7, where E.ON E&P Norge AS is the operator.

Adapted from press release by Katie Woodward

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