16/3-4 A

Exploration · Appraisal · P&A · Oil · Lundin Norway AS · Johan Sverdrup · PL 501

16/3-4 A is an appraisal exploration wellbore in the North Sea, drilled by Lundin Norway AS, entered Jun 28, 2011, to 2,128 m in the Basement.

Discovery 16/2-6 Johan Sverdrup · On the map →

2,128: m total depth · 1,958.6 m vertical
117: m water depth
Jun 28, 2011: entered · completed Jul 18, 2011
Basement: at total depth · Pre-Devonian
15.3: m of core in 1 core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUL 18, 2013

On file for this wellbore

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

Drilling

Drilling facility: BREDFORD DOLPHIN · Semisub steel
Drilling days: 21
Kelly bushing elevation: 25 m
Maximum inclination: 32.90000153°
Drilling permit: 1365-L
Licensing round: TFO2008
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 58.80316° N, 2.71897° E
Hydrocarbons in: Intra Draupne Fm Ss · Late Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 16/3-4 A is a sidetrack to well 16/3-4, which was drilled to prove the extension of the Avaldsnes Discovery to the north-east of the structural crest of the Avaldsnes structure. Well 16/3-4 proved oil in a 14 m thick Intra-Draupne Formation sandstone overlying weathered basement rock. The oil was proven to be in pressure communication with the 16/2-6 Avaldsnes discovery well. The 16/3-4 A sidetrack was drilled up-flanks (south-south-west) of the main well bore. The objective was to further appraise the Avaldsnes oil discovery and to determine the extent, thickness, and quality of the reservoir in this part of the structure.

Operations and results

Well 16/3-4 A was kicked off from 790 m in the primary well on 28 June 201. I was drilled with the semi-submersible installation Bredford Dolphin to TD at 2128 m (1959 m TVD) in granitic basement. No significant problem was encountered in the operations. The well was drilled with Performadril mud from kick-off to TD.

The geological sidetrack 16/3-4 A encountered top Draupne Formation shales at 2065.5 m (1906.3 m TVD). At 2076.5 m (1915.6 m TVD) a 5 m vertical thickness of Intra-Draupne Formation sandstone was penetrated. The Draupne sandstone was oil bearing down to fractured basement at 2081.6 m (1919.8 m). Slightly different fluid gradients were recorded compared to the main wellbore, however, PVT analysis of the samples showed identical oil to be present in both wellbores. No oil water contact was established. The first oil shows in the sidetrack were observed in the marls of the Åsgard Formation in a sidewall core at 2052.8 m. More extensive oil shows were seen in the underlying Draupne sandstones. The oil shows became weaker in the fractured basement that was recovered in

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.

Developers: this page as JSON is GET /v1/data/norway/wells/6629, documented in the API reference.