ID: 422
OBJECTID: 422
wlbNpdidWellbore: 428
wlbName: 34/10-5
wlbHistory:

General

Well 34/10-5 was drilled in the western part of the Delta Closure in Block 34/10 in the Northern North Sea. The primary objective of well 34/10-5 was sandstones of Middle Jurassic age. Secondary objectives were sandstones of Early Jurassic age.

Operations and results

Appraisal well 34/10-5 was spudded with the semi-submersible installation Ross Rig on 18 October 1979 and drilled to TD at 2780 m in the Late Triassic Lunde Formation. Apart from lost circulation problems in the 12 1/4" section the drilling itself went quite smoothly. However, almost 21 days were lost due to bad weather conditions. The well was drilled with spud mud down to 518 m, with gel/lignosulphonate from 518 to 1775 m, with gel/lignite/lignosulphonate from 1775 m to 2210 m, and with gel/lignosulphonate from 2210 m to TD.

The Brent Group was encountered at 1896 m and was oil bearing down to the OWC at ca 1972 m. Test results indicated the same fluid system as in the previous wells drilled on the structure.

Oil shows were recorded from 1250 m and downwards more or less continuously on claystone, limestone and siltstone to top Brent level. No shows were recorded below OWC.

Four cores were recovered in the interval from 1917 to 1974.7 m. One RFT fluid sample from the Brent Group recovered ca 0.5 l oil and 1 l of mud filtrate.

The well was permanently abandoned on 2 January 1980 as an oil appraisal well.

Testing

The Tarbert Formation was tested from perforations in the inte
wlbHistoryDateUpdated: 2016-07-06T00:00:00