33/12-8 S

Exploration · Wildcat · P&A · Oil/gas · Statoil ASA (old) · Gullfaks Sør · PL 152

33/12-8 S is a wildcat exploration wellbore in the North Sea, drilled by Statoil ASA (old), entered Mar 26, 2002, to 3,750 m in the Statfjord Gp.

Discovery 33/12-8 S Skinfaks · On the map →

3,750: m total depth · 3,380.7 m vertical
137: m water depth
Mar 26, 2002: entered · completed Apr 26, 2002
Statfjord Gp: at total depth · Early Jurassic
—: m of core
124: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED APR 26, 2004

On file for this wellbore

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

Drilling

Drilling facility: BORGLAND DOLPHIN · Semisub steel
Drilling days: 32
Kelly bushing elevation: 31 m
Maximum inclination: 0°
Drilling permit: 1031-L
Licensing round: 12
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 61.07732° N, 1.96561° E
Hydrocarbons in: Brent Gp · Middle Jurassic
Hydrocarbons in: Statfjord Gp · Early Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 33/12-8 S is situated in the Tampen Spur area and the structure is a rotated fault block on the southern part of the Beta Ridge. The purpose of the wildcat well 33/12-8 S was to evaluate the potential for hydrocarbons in the "Dole" prospect (Skinfaks segment N3) of the Middle Jurassic Brent Group and the Early Jurassic Statfjord Group. A secondary objective was to identify the hydrocarbon contact in the Brent Group. A sidetrack from 13 3/8" shoe into the N2-segment ("Ole") was considered in case of a positive hydrocarbon finding in the Middle Jurassic Brent Group.

Operations and results

Wildcat well 33/12-8 S was spudded on 26 March 2002 with the semi-submersible installation Borgland Dolphin and drilled to TD at 3750 m (3380.7 m TVD RKB) in the Statfjord Formation, Eriksson Member. The well was drilled with CMC/seawater above 26" hole/20" casing. The 17 1/2" section was drilled with Glydril MC, a water-based KCl mud with glycol additive. Versavert OBM was used below the13 3/8" casing at 2066 m.

The drilling progress was slow in the uppermost 36" section because of cuttings falling into the hole. In the following 26" section boulders were encountered around 478 m and 489 m and followed up with backreaming. Prognosed sand with potential shallow gas was encountered at 450 m. Gamma ray and resistivity showed water filled sand. Further drilling in the 17 1/2" and 8 1/2" section went well, with exception of the Shetland Group, which was significantly slower to drill due to marl/calcareous claystone. The well proved an approximately 81 m TVD thick hydrocarbon column in Tarbert and Upper Ness Formations. The discovery was oil with a gas cap. Lower part of Ness Formation and Etive Formation was water filled. A five meters column with oil (TVD) was in addition encountered in the Statfjord Formation. The stratigraphic column in the N3 segment was found 30-50 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.

Developers: this page as JSON is GET /v1/data/norway/wells/4493, documented in the API reference.