24/12-5 S

Exploration · Appraisal · P&A · Dry · Noil Energy ASA · PL 341

24/12-5 S is an appraisal exploration wellbore in the North Sea, drilled by Noil Energy ASA, entered Nov 15, 2007, to 2,325 m in the Heimdal Fm.

Discovery 24/12-3 S · On the map →

2,325: m total depth · 2,239 m vertical
116: m water depth
Nov 15, 2007: entered · completed Dec 21, 2007
Heimdal Fm: at total depth · Paleocene
—: m of core
59: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED DEC 21, 2009

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: 37
Kelly bushing elevation: 25 m
Maximum inclination: 25°
Drilling permit: 1158-L
Licensing round: TFO2004
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.11157° N, 1.78924° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 24/12-5 S is located in the Vana sub-basin in the North Sea about 20 km north of the 15/3-1 S Gudrun discovery, and about 20 km west of Balder. The exploration target for well 24/12-5 S was to delimit the Heimdal Formation discovery made in well 24/12-3 S in 1996.A base case oil column of 34 meters was prognosed at the well location. The oil column was calculated based upon the found oil water contact in well 24/12-3 S, which for the base case top reservoir map coincided with the structural spill. The Heimdal sandstone has a continuous extension in the area. Well 24/12-5 S was planned with a TD of approximately 30 m into the Heimdal Sands or 30 m below a found OWC.

Operations and results

Well was spudded with the semi-submersible installation on and drilled to TD at 2325 m (2239 m TVD) in the Paleocene Heimdal Formation sandstones. The well path was vertical down to 750 m, building angle up to a maximum of 25 deg at 1297 m, then falling off to 17 deg towards TD. A total of 21% Non-Productive Time was experienced in the well, mostly related to problems during plug and abandon, and 6% Waiting On Weather. The well was drilled with seawater and sweeps down to 658 m, with KCl/Glycol Enhanced Mud from 658 m to 1592 m, and with KCl/polymer mud (Performadril) from 1592 m to TD.

The target top Heimdal Formation was penetrated at 2277 m (2194 m TVD), 15 m TVD deeper than prognosed. The Heimdal Formation contained good quality reservoir sandstone. The well was however dry with no oil shows and generally low levels of gas.

No cores were cut and no wire line logging or fluid sampling was performed.

The well

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.

Developers: this page as JSON is GET /v1/data/norway/wells/5638, documented in the API reference.