ID: 382
OBJECTID: 382
wlbNpdidWellbore: 387
wlbName: 30/7-4
wlbHistory:

General

Well 30/7-4 is located in the eastern part of the East Shetland Basin in the North Sea. The well location is due west of the Oseberg Field and ca 2.5 km from the UK Border. The main objective of the well was to test Middle and Early Jurassic sandstones (Brent Group and Statfjord Formation) Secondary objectives were possible lower Cretaceous carbonate development, and possible Late Jurassic sandstones.

Operations and results

Well 30/7-4 was spudded with the semi-submersible installation Polyglomar Drilling on 25 January 1977. A 17 1/2" pilot hole was drilled to 192 m. The operation had to be suspended for two days due to bad weather. When the operation was continued, the 17 1/2" pilot hole could not be found and a new 36" hole was drilled. The 30" casing was set and cemented at 193 m. The weather conditions made it necessary to set piggy backs on five anchors. A 17 1/2" hole was drilled to 778 m in assumed Miocene sediments. This was the planned setting depth for the 20" casing. While reaming out the 17 1/2" hole to 26" prior to running 20" casing, the drill string parted. An overshot was worked over the fish but attempts to pull the fish were unsuccessful. The string was backed off at 538 m in the x-over above the overshot and the hole was given up. The well was drilled with seawater and gel.

No cores were cut, no logs were run, and no wire line fluid samples were taken.

The well was permanently abandoned on 5 February as a junk well and the rig was prepared for spudding replacement well 30/7-5.

Testing

No drill stem test
wlbHistoryDateUpdated: 2016-07-06T00:00:00