Centrica, operator of production license 405, has completed drilling of wildcat well 8/10-4 S and appraisal well 8/10-4 A at the Butch oil discovery.
The wells were drilled about 13 kilometers 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-meter 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 meters (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 license 405. The license 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 meters below the sea surface, respectively, and were terminated in the Skagerrak formation from the Triassic Age. The water depth is 66 meters.
The wells were drilled by the drilling facility Maersk Guardian (350' ILC).
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