35/12-6 A

Exploration · Appraisal · P&A · Dry · Wellesley Petroleum AS · PL 925

35/12-6 A is an appraisal exploration wellbore in the North Sea, drilled by Wellesley Petroleum AS, entered Jun 15, 2018, to 3,263 m in the Heather Fm.

Discovery 35/12-6 S (Kallåsen) · On the map →

3,263: m total depth · 2,993 m vertical
355: m water depth
Jun 15, 2018: entered · completed Jun 30, 2018
Heather Fm: at total depth · Middle Jurassic
—: m of core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED AUG 18, 2026 · RELEASED JUN 30, 2020

On file for this wellbore

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

Drilling

Drilling facility: TRANSOCEAN ARCTIC · Semisub steel
Drilling days: 16
Kelly bushing elevation: 24 m
Maximum inclination: 40.90000153°
Drilling permit: 1704-L
Licensing round: TFO2017
Plugged and abandoned: Jun 30, 2018
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 61.22919° N, 3.75702° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 35/12-6 A is a geological side-track to well 35/12-6 S on the Uer Terrace south-east of the 35/9-7 Nova discovery in the North Sea. Well 35/12-6 S found oil in the Fensfjord Formation, but the oil-water contact could not be established. The objective of the side-track well was to drill down-dip on the structure to delineate the oil accumulation.

Operations and results

Appraisal well 35/12-6 A was kicked off at 1059 m in well 35/12-6 S on 15 June 2018. It was drilled with the semi-submersible installation Transocean Arctic to TD at 3263 m (2993 m TVD) in Callovian age sediments in the Heather Formation. Operations proceeded without significant problems. The well was drilled with Innovert oil-based mud from kick-off to TD.

Well 35/12-6 A encountered top Fensfjord Formation at 3157 m (2906 m TVD). Fensfjord was 42.3 m TVD thick and was very heterolithic with only 6.9 m net water-bearing reservoir of moderate quality. No oil shows were observed in the well. Evaluation of the combined data from the main bore and the side-track (pressures, cores and logs) suggest an OWC between 2854.4 and 2866 m TVD, so the well penetrated Fensfjord below the OWC.

No cores were cut in 35/12-6 A. MDT water samples were taken at 3199.2 m and 3211.8 m.

The well was permanently abandoned on 30 June 2018 as a dry appraisal well.

Testing

No drill stem test was performed.

Around this wellbore

This wellbore on Sodir FactPages → · Press release →

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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