25/2-18 A

Exploration · Appraisal · P&A · Oil · Det norske oljeselskap ASA · Hugin Satellitter · PL 442

25/2-18 A is an appraisal exploration wellbore in the North Sea, drilled by Det norske oljeselskap ASA, entered Sep 11, 2016, to 4,066 m in the Drake Fm.

Discovery 25/2-18 S (Langfjellet) · On the map →

4,066: m total depth · 3,723 m vertical
121: m water depth
Sep 11, 2016: entered · completed Oct 19, 2016
Drake Fm: at total depth · Early Jurassic
—: m of core
125: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED OCT 19, 2018

On file for this wellbore

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

Drilling

Drilling facility: MAERSK INTERCEPTOR · Jack-up 3 legs
Drilling days: 39
Kelly bushing elevation: 55 m
Maximum inclination: 42.20000076°
Drilling permit: 1638-L
Licensing round: TFO2006
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 59.82503° N, 2.63169° E
Hydrocarbons in: Hugin Fm · Middle Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 25/2-18 A is a geological sidetrack to 25/2-18 S, located on the Bjørgvin Arch, four kilometers south of the 25/2-10 S (Frigg Gamma Delta) oil/gas discovery and eight kilometers north of the Frøy field in the North Sea. The 25/2-18 S well discovered oil in the Middle Jurassic Hugin Formation, the Langfjellet prospect. The target for well 25/2-18 A was southeast of 25/2-18 S but within the same segment. The objectives for sidetrack 25/2-18 A was to confirm hydrocarbons in the Hugin and Sleipner formations and to perform a drill stem test (DST).

Operations and results

Appraisal well 25/2-18 A was kicked off from the main bore below the 13 3/8'' casing shoe at 1555 m. It was drilled with the jack-up installation Mærsk Interceptor to TD at 4066 m (3723 m TVD) m in the Early Jurassic Drake Formation. No significant problem was encountered in the operations. The well was drilled with Versatec oil based mud from kick-off to TD.

The Hugin Formation came in at 3698 m (3361 m TVD) and the Sleipner Formation came in at 3825.5 m (3486.3 m TVD). The well proved oil proved in the Hugin Formation with an “oil down to” contact at approximately 3768 m (3430 m TVD). A total of 63 m gross reservoir thickness with 53 m net reservoir distributed across two separate compartments was recorded. No shows were recorded on cuttings due to flushing by OBM. No significant change was observed in shows on sidewall cores going from an oil zone to water zone, indicating that also sidewall cores are flushed and shows masked by OBM.

No conventional cores were cut. A total of 17 MDT samples were acquired: 3 oil samples at 3701.5 m, 4 oil samples at 3715.4 m,

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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