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07/12/2011 Centrica Resources (Norge) AS, operator of production licence 405, has completed drilling of wildcat well 8/10-4 S and appraisal well 8/10-4 A.
The wells were drilled about 13 kilometres east of the Ula field in the southern part of the North Sea.
The objective of well 8/10-4 S was to prove petroleum in Upper Jurassic reservoir rocks (Ula formation). The well encountered oil in a 55-metre gross column in the Ula formation with good reservoir rocks and good reservoir quality, as expected. Preliminary estimates of the size of the discovery are between five and ten million standard cubic metres (Sm3) of recoverable oil.
To prove further oil volumes, a sidetrack well, 8/10-4 B, will be drilled from well 8/10-4 S in the Ula formation in a separate segment further south in the structure.
Well 8/10-4 S has not been formation-tested, but extensive data acquisition and sampling have taken place. Due to technical drilling issues, a technical sidetrack, 8/10-4 A T2, was also drilled to take pressure points to determine the oil/water contact.
The wells are the two first wells to be drilled in production licence 405. The licence was awarded in APA 2006. Wells 8/10-4 S and 8/10-4 A were drilled to vertical depths of 3066 m and 3116 metres below the sea surface, respectively, and were terminated in the Skagerrak formation from the Triassic Age. The water depth is 66 metres.
The wells were drilled by the Maersk Guardian drilling facility.
Contact in the NPD
Eldbjørg Vaage Melberg, tel.+ 47 51 87 61 00