NORWAY · WELLBORES · NPDID 297
7/12-3 A
Exploration · Appraisal · P&A · Oil shows · BP Norway Limited U.A. · Ula · PL 019
7/12-3 A is an appraisal exploration wellbore in the North Sea, drilled by BP Norway Limited U.A., entered Jun 4, 1977, to 4,191 m in the Zechstein Gp.
Discovery 7/12-2 Ula · On the map →
- 4,191
- m total depth · 4,011 m vertical
- 71
- m water depth
- Jun 4, 1977
- entered · completed Sep 6, 1977
- Zechstein Gp
- at total depth · Late Permian
- 85.5
- m of core in 7 cores
- 163
- °C bottom-hole temperature
SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED SEP 6, 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
- 95
- Kelly bushing elevation
- 25 m
- Maximum inclination
- 0°
- Drilling permit
- 191-L
- Licensing round
- 1-A
- Plugged and abandoned
- —
- Core samples available
- Yes
- Cuttings samples available
- No
- Position · ED50
- 57.10682° N, 2.81154° E
Well history
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
General
Well 7/12-3 A is a geological sidetrack to 7/12-3 on the western flank of the 7/12-2 Ula discovery in the North Sea. The primary objective was to establish the oil-water level in the Ula structure.
The well is type well for the Mandal Formation.
Operations and results
On 4 June 1977 appraisal well 7/12-3 A was kicked off from below the 13 3/8” casing shoe in well 7/12-3 at a depth of 1720. The semi-submersible installation Norskald drilled the well to TD at 4191 m (4011 m TVD) in the Permian Zechstein Group.
Well 7/12-3A penetrated the reservoir at 3638.5 (3506.8 m TVD). The cores showed oil staining, cut and fluorescence. Wire line logs and testing showed this to be immovable oil, and indicated an oil water transition zone to a depth of 3693.5. (3555.3 m TVD). One hundred and eighty-nine meters of Ula Formation reservoir were encountered representing a true thickness of 168.9 m, and a net to gross ratio of 0.83 assuming a 10% porosity cut off on the computer-processed log.
Seven full hole cores were cut from 3642.0 to 3730.0 m. RFT fluid samples were taken at 3675.5 m (salt water and mud filtrate) and 3688.5 m (salt water with traces of gas and oil/oil-water emulsion).
The well was permanently abandoned on 6 September 1977 as a dry well with shows.
Testing
DST 1 tested the interval 3771.0 to 3715.5m. The test flowed 192 m3 saline formation water /day through a 32/64 choke. The DST temperature was 146.7 °C.
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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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