ID: 284
OBJECTID: 284
wlbNpdidWellbore: 289
wlbName: 2/11-6 S
wlbHistory:

General

Well 2/11-6 S was drilled on the Lindesnes Ridge in the southern North Sea. The objective was to appraise the Hod discovery made by well 2/11-2 in 1974 (Hod West) and appraisal well 2/11-3 in 1977 (Hod East). The Hod structure is oil-bearing in Late Cretaceous chalks, the Hod and Tor formations. Well 2/11-6 S targeted the Hod East structure.

Operations and results

Appraisal well 2/11-6 S was the first well to be drilled on a subsea template which was laid by the semi-submersible installation Sedco 703. It was then drilled with Sedco 703 through slot number W7 of the twelve slot templates, to TD at 3970 m (2905 m TVD) where the pipe got stuck. The pipe was shot off with top of the fish at 3669 m and a technical sidetrack 2/11-6 ST1 was kicked off from 3626 m. The sidetrack was drilled to the final TD at 4076 m (2980 m TVD). The initial well bore was drilled with seawater and hi-vis sweeps down to 1460 m, with Vertoil oil based mud from 1460 m to 3601 m, and with Oilfaze oil based mud from 3601 m to 3970 m. The 2/11-6 ST1 sidetrack was drilled with Vertoil oil based mud from kick-off to TD.

Well 2/11-6 drilled a nearly complete Tertiary section and penetrated top chalk at 3690 m (2732 m TVD). The sidetrack penetrated top of the chalk group at 3685 m (2729 m) with a slightly lower angle (50 deg) than in the initial well bore (55 deg). The chalk stratigraphy in the two well bores was very similar apart from the angle/depth shift. The well tested oil in the Tor / upper Hod formations and in the lower Hod Formation.

Seven conventional cores were cut from 3693 to 3741 m in the initial well bore before side tracking. The cores were cut in the Late Cretaceous Chalk. The total recove
wlbHistoryDateUpdated: 2016-07-06T00:00:00