6305/4-2 S

Exploration · Appraisal · P&A · Dry · A/S Norske Shell · Ormen Lange · PL 209

6305/4-2 S is an appraisal exploration wellbore in the Norwegian Sea, drilled by A/S Norske Shell, entered Nov 4, 2010, to 2,985 m in the Nise Fm.

Discovery 6305/5-1 Ormen lange · On the map →

2,985: m total depth · 2,905 m vertical
1,086: m water depth
Nov 4, 2010: entered · completed Feb 11, 2011
Nise Fm: at total depth · Late Cretaceous
42.8: m of core in 3 cores
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED SEP 25, 2026 · RELEASED FEB 11, 2013

On file for this wellbore

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

Drilling

Drilling facility: WEST NAVIGATOR · Vessel
Drilling days: 100
Kelly bushing elevation: 36 m
Maximum inclination: 25.39999962°
Drilling permit: 1322-L
Licensing round: 15
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 63.63747° N, 5.29837° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

The Ormen Lange appraisal well 6305/4-2 S was drilled within the DHI limits in the NW of the Ormen Lange field in the Norwegian Sea. The main objectives were to appraise the fluid content and reservoir quality of the Egga Reservoir Unit (Egga informal Formation), and to investigate the degree of pressure communication between the planned northern area C-template and the existing central area A-and B-templates

Operations and results

Appraisal well 6305/4-2 S was spudded with the dynamic positioning drilling vessel West Navigator on 4 November 2010 and drilled to TD at 2985 m (2905 m TVD) in the Late Cretaceous Nise Formation. Ormen Lange appraisal well 6305/4-2 S encountered challenges while drilling the deeper sections. Some cavings were observed in the 17.5" section through Brygge Formation. TD was therefore called shallower due to a rump up in pore pressure. Tight spots and cavings were also observed while drilling the 8.5"section. During the first wire line 8.5" logging run, the string became differentially stuck and fishing operations were required to retrieve the string. The well was drilled with seawater/PHB sweeps and displacement mud down to 1738.5 m and with Aqua-Drill Deepwater mud from 1738.5 m to TD.

Top of the Egga Reservoir Unit was encountered at 2835 m (2768.3 m TVD), 2.7 m shallow to prognosis. The base was penetrated at 2864 m (2794.5 m TVD) giving 27.3 m TVD gross reservoir. Of this 22.7 m TVD was net reservoir. The reservoir properties were as prognosed; average porosity and permeability was 27% and 261.5 mD respectively. The reservoir was water bearing and the pressure (298.4 bar) indicated high pressured water, most likely marginally depleted, and supported a hydrodynamic aquifer model. Th

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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