25/8-18 S

Exploration · Appraisal · P&A · Oil · Statoil Petroleum AS · Breidablikk · PL 169

25/8-18 S is an appraisal exploration wellbore in the North Sea, drilled by Statoil Petroleum AS, entered Sep 29, 2014, to 1,890 m in the Tor Fm.

Discovery 25/8-4 Breidablikk · On the map →

1,890: m total depth · 1,884 m vertical
129: m water depth
Sep 29, 2014: entered · completed Oct 23, 2014
Tor Fm: at total depth · Late Cretaceous
48.5: m of core in 2 cores
74: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED OCT 23, 2016

On file for this wellbore

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

Drilling

Drilling facility: TRANSOCEAN LEADER · Semisub steel
Drilling days: 24
Kelly bushing elevation: 23.5 m
Maximum inclination: 11°
Drilling permit: 1503-L
Licensing round: 13
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.25032° N, 2.61682° E
Hydrocarbons in: Heimdal Fm · Paleocene

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/8-18 S was drilled to appraise the 25/8-4 Hedila discovery on the Utsira High, east of the Ringhorne and Grane Fields in the North Sea. The primary objective was to test the Hydrocarbon potential in Lower Heimdal sands. Secondary objective was to test the upper Heimdal Formation, in a structurally high location.

Operations and results

Appraisal well 25/8-18 S was spudded with the semi-submersible installation Transocean Leader on 29 September 2014 and drilled to TD at 1890 m in the Late Cretaceous Tor Formation. The well was drilled as a J shape well, consisting of three hole sections: 36", 17 1/2" and 12 1/4". To reach the target location, the well was drilled with an inclination of up to 11 deg in the 12 1/4 section. There were no indication of shallow gas in the well. No significant problem was encountered in the operations. The well was drilled with seawater/spud mud down to 1165 m and with XP-07 oil based mud from 1165 m to TD.

The well encountered a 25 m oil column in sandstones with good reservoir properties from top Lower Heimdal Formation at 1759.0 m (1755.5 m TVD) and down to the OWC at 1785 m (1780.5 m TVD). In addition, several thin hydrocarbon-filled stringers, interpreted as Upper Heimdal injectites, were found within the Lista Formation. The pressure points indicate a continuous oil gradient through the upper and lower sands, inferring vertical communication between the Upper- and Lower Heimdal Formation. Additionally, the well found a gas-filled sand stringer at 1704 to 1707 m within the Balder Formation. Hydrocarbon shows were seen only inn association with the hydrocarbon-filled intervals.

Two 27 m cores were cut from 1737.5 to 1792

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/7388, documented in the API reference.