6506/12-10 A

Exploration · Appraisal · P&A · Oil/gas · Den norske stats oljeselskap a.s · Åsgard · PL 094

6506/12-10 A is an appraisal exploration wellbore in the Norwegian Sea, drilled by Den norske stats oljeselskap a.s, entered Jun 27, 1995, to 6,260 m in the Åre Fm.

Discovery 6506/12-1 Smørbukk · On the map →

6,260: m total depth · 5,361 m vertical
285: m water depth
Jun 27, 1995: entered · completed Dec 11, 1995
Åre Fm: at total depth · Early Jurassic
176.4: m of core in 11 cores
189: °C bottom-hole temperature

SODIR FACTPAGES · RECORD UPDATED NOV 4, 2026 · RELEASED DEC 11, 1997

On file for this wellbore

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

Drilling

Drilling facility: ROSS RIG (2) · Semisub steel
Drilling days: 168
Kelly bushing elevation: 24 m
Maximum inclination: 57.70000076°
Drilling permit: 817-L
Licensing round: 8
Plugged and abandoned: —
Core samples available: Yes
Cuttings samples available: Yes
Position · ED50: 65.13551° N, 6.81846° E
Hydrocarbons in: Fangst Gp · Middle Jurassic
Hydrocarbons in: Båt Gp · Early Jurassic

Well history

WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE

General

The main objective of well 6506/12-10 A was to appraise the down flanks hydrocarbons in the Garn, Ile, Tilje, and the Åre Formation, on the Smørbukk Field.

Operations and results

The appraisal sidetrack well 6506/12-10 A was kicked off with the semi-submersible installation "Ross Rig" from 2823 m in 6506/12-10 on 25 June 1995 and drilled to 6260 m with a total cost considerably higher than planned budget. The higher costs were mainly due to kick off and orienting problems from the vertical well, lots of trips to change bits, milling cones lost in the 12 1/4" hole and problems cementing the 7" liner. In general the drilling rate was lower than expected. Oil based mud (ANCO VERT) was used trough out the sidetrack. High mud weight (1.80 g/cm3) was used in the beginning to prevent formation damage during drilling. This can have caused lower ROP than expected. Prior to testing, a lot of leakage problems occurred within the test string mainly due to bad quality of the o-rings in the Halliburton test-valves. The string was pulled and reran 5 times before all the problems were sorted out. Total lost times in the test phase was 893 hrs (squeeze cementing of 7" liner, leak in BHA of the test string, BOP problems, WOW, fishing of packer slips).

Eleven cores were cut in the Tilje and Åre Formations. Two FMT samples were taken in the Garn Formation (4397.7 m TVD and 4402.7 m TVD, respectively) and one in the Tilje Formation (4806.8 m TVD). The Garn samples contained water while the Tilje sample contained oil. The 6506/12-10A well proved producible oil in the Garn, Ile, Tilje and upper parts of the Åre Formations in good sand intervals. After testing the well 6506/12-10 A was permanently plugged and abandoned on 11 December 1995 as an oil and gas appraisal well.

Testing

The test plan included short tests of the Åre and Tilje Formations followed by a long term production period. Therea

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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.

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