33/9-21 S

Exploration · Appraisal · P&A · Oil · Revus Energy ASA · PL 037 D

33/9-21 S is an appraisal exploration wellbore in the North Sea, drilled by Revus Energy ASA, entered Dec 23, 2008, to 6,051 m in the Etive Fm.

Discovery 33/9-6 DELTA · On the map →

6,051: m total depth · 3,105 m vertical
156.1: m water depth
Dec 23, 2008: entered · completed Mar 19, 2009
Etive Fm: at total depth · Middle Jurassic
—: m of core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED FEB 20, 2026 · RELEASED MAR 19, 2011

On file for this wellbore

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

Drilling

Drilling facility: MURCHISON A · Jacket 12 legs
Drilling days: 87
Kelly bushing elevation: 56.4 m
Maximum inclination: 70°
Drilling permit: 1171-L
Licensing round: Awarded additionally to round 2-A
Plugged and abandoned: —
Core samples available: No
Cuttings samples available: No
Position · ED50: 61.39674° N, 1.74090° E
Hydrocarbons in: Brent Gp · Middle Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

The Delta discovery, made by well 33/9-6 in 1976, is situated approximately 4.5 km east of the Murchison platform. Well 33/9-6 had good oil shows, but was not tested due to mechanical problems. An oil down-to at 2998 m TVDSS corresponding to the top Mid Ness shale was seen in the well. The well had moderate reservoir quality within the Tarbert/Ness Formations, and excellent reservoir quality within the water-bearing Etive Formation.

Well 33/9-21 S was drilled to appraise the Brent Group reservoir quality and the oil-water contact as seen in well 33/9-6. If the reservoir quality was within expectations a horizontal sidetrack would be drilled to further evaluate the oil-bearing sands and eventually to undertake a test production.

The well was drilled deviated from the Murchison Platform on the UK side of the border, where the well name is UK211/19a-M75z.

Operations and results

Appraisal well 33/9-21 S was spudded from the Murchison Platform on 22 December 2008 and drilled to TD at 6051 m (3048 m TVD SS) in the Middle Jurassic Etive Formation. The well was drilled with Bentonite PAC mud down to 805 m, with KCl/glycol mud form 805 m to 1577 m, and with Versaclean oil based mud from 1577 m to TD.

Top target reservoir came in at 5867 m (2972 m TVD SS), 10 m low to prognosis. Hydrocarbons were encountered in the Tarbert, Ness and Etive formations with an OWC within the Etive sands at 3004 m TVD SS. Log interpretation confirmed the expected Brent Group reservoir quality as seen in well 33/9-6. A horizontal sidetrack was thus decided to further appraise the oil-bearing sands. Shows were reported as "no shows above OBM" th

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/5791, documented in the API reference.