ID: 47
OBJECTID: 47
wlbNpdidWellbore: 48
wlbName: 2/1-4
wlbHistory:

General

Well 2/1-4 was drilled on the margin between the southern Vestland Arch and the Central Trough in the North Sea. The first well in the block, well 2/1-1 drilled in 1972, was abandoned after taking a kick in the Late Jurassic. The second well, well 2/1-2 drilled in1978 encountered water wet Late Jurassic sandstones. The 2/1-3 well was drilled in 1980 on the downthrown side of a NW-SE trending fault complex and found oil in a 60 m thick Late Jurassic sandstone. A second Jurassic sandstone in 2/1-3 (Ula Formation) was water wet. The primary objective of the 2/1-4 well was to appraise the oil in the Late Jurassic "2/1-3 sandstone" (Gyda member). Secondary objectives were to test the Ula and Bryne Formations and the Triassic.

The well is reference well for the Vidar Formation.

Operations and results

Appraisal well 2/1-4 was spudded with the semi-submersible installation Aladdin on 5 April 1982 and drilled to TD at 4525 m in the Late Permian Zechstein Group. The first and second spuds were unsuccessful and only the third spud, on 12 April and 60 + 50 ft in direction 315 deg away from the planned location, was successful. The 17 1/2" section from 633 to 2006 m and the upper part of the 12 1/4" section were drilled with severe swelling shale (gumbo) problems. The well was drilled with seawater and hi-vis pills down to 633 m, with CMC/gypsum mud from 633 m to 2006 m, and with CMC/gypsum/lignoslulfonate mud from 2006 m to TD.

Well 2/1-4 penetrated the top of the Late Jurassic sandstone at 4040 m and the log and core analysis confirmed the formation to be oil bearing. The log evaluation and core studies showed the Late Jurassic sandstone to consist of two main zone
wlbHistoryDateUpdated: 2016-05-19T00:00:00