7/12-3

Exploration · Appraisal · P&A · Dry · BP Norway Limited U.A. · Ula · PL 019

7/12-3 is an appraisal exploration wellbore in the North Sea, drilled by BP Norway Limited U.A., entered Apr 5, 1977, to 3,710 m in the Ula Fm.

Discovery 7/12-2 Ula · On the map →

3,710: m total depth · 3,709 m vertical
71: m water depth
Apr 5, 1977: entered · completed Jun 3, 1977
Ula Fm: at total depth · Late Jurassic
16.4: m of core in 1 core
—: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED JUN 3, 1979

On file for this wellbore

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

Drilling

Drilling facility: NORSKALD · Semisub steel
Drilling days: 60
Kelly bushing elevation: 24 m
Maximum inclination: 2.79999995°
Drilling permit: 174-L
Licensing round: 1-A
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 57.10682° N, 2.81154° E

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

Well 7/12-3 was drilled as an appraisal well on the western flank of the 7/12-2 Ula Discovery in the North Sea.

Operations and results

Appraisal well 7/12-3 was spudded with the semi-submersible installation Norskald on 5 April 1977 and drilled to TD at 3710 m in Late Jurassic sediments. The drilling, coring and logging of the well were of a routine nature. Plugging of the flow lines and screens by hydrating clays while drilling the 17-1/2" hole caused delays and the loss of considerable quantities of mud. Rates of penetration were less than anticipated in the Lower Cretaceous and Upper Jurassic mudstones/ shales. Ninety-four hours were lost through weather delays during the course of the well. The well was drilled with fresh water and gel down to 471 m and with Lime/Drispac mud from 471 m to TD.

Core, log and R.F.T. analyses proved the well to have penetrated the Jurassic reservoir discovered in well 7/12-2 beneath the oil water contact.

One core was cut in the Jurassic section, from 3612.2 to 3628.6 m. An RFT water sample was taken at 3683 m

The well was plugged back for sidetracking on 3 June as a dry well.

Testing

No drill stem test was performed.

Around this wellbore

This wellbore on Sodir FactPages →

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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