2/11-5

Exploration · Appraisal · P&A · Oil shows · Amoco Norway Oil Company · Hod · PL 033

2/11-5 is an appraisal exploration wellbore in the North Sea, drilled by Amoco Norway Oil Company, entered May 18, 1979, to 2,945 m in the Rødby Fm.

Discovery 2/11-2 Hod · On the map →

2,945: m total depth · 2,944 m vertical
72: m water depth
May 18, 1979: entered · completed Jul 5, 1979
Rødby Fm: at total depth · Early Cretaceous
—: m of core
106: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUL 5, 1981

On file for this wellbore

What the Directorate holds from this wellbore. Each opens the section that lists it.

Drilling

Drilling facility: DYVI ALPHA · Semisub steel
Drilling days: 49
Kelly bushing elevation: 25 m
Maximum inclination: 4.4000001°
Drilling permit: 214-L
Licensing round: 2-A
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 56.16603° N, 3.43512° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 2/11-5 was drilled on the western lobe of the Hod Field to test the Late Cretaceous Chalk section. The well was located 1.8 km SSE of 2/11-2 which tested oil from a very thin Chalk section of the Lower Hod Formation. Structural interpretations were made showing a NW-SE trending graben traversing the West Hod lobe. Based on a model from East Hod, it was expected that the porous Tor Formation should be preserved below the unconformity within this structure.

Operations and results

Well 2/11-5 was spudded with the semi-submersible installation Dyvi Alpha on 18 May 1979 and drilled to TD at 2945 m in the Early Cretaceous Rødby Formation. No significant problem was encountered in the operations, however six days were spent repairing the BOP stack before it could be run and two days were spent while mixing oil-based mud. The well was drilled with seawater, bentonite and CMC EHV down to 1285 m, with gyp/CMC mud from 1285 m to 2320 m, with lignosulphonate mud from 2320 m to 2765 m, and with oil based "Oilfaze" mud from 2765 m to TD.

The Paleocene Ash Marker (Balder Formation) was encountered at 2715 m; 105 m low to prognosis. The top of the Chalk Group, Ekofisk Formation was encountered at 2822 m; 117 m low to prognosis. In total, the Chalk section was found to be 98 m thick, whereas 300 m was predicted. These discrepancies reflect the effects of the shallow gas in the area on the seismic data. The velocity corrections which were applied to the seismic were too large. As a consequence, the Chalk Group within the Graben was found below the oil-water contact of the area and no moveable hydrocarbons were encountered. Frequent oil shows were reported however, starting in the upper part of the Hordaland Group:

Around this wellbore

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About this data

Norwegian Offshore Directorate (Sodir) FactPages, mirrored nightly and used under the Norwegian Licence for Open Government Data (NLOD). Depths are metres along the wellbore from the kelly bushing unless a row gives its own unit; older cores are filed in feet. A zero the Directorate files for an unmeasured pressure, density, or temperature is shown as a dash.

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