The NPD's Fact-pages
	Generated 11.02.2012

After more than 10 years as a fact provider NPDs FactPages version 1 will be shut down in Dec. 2011. Start using FactPages version 2 now! See also FactPages version 2 Quick Reference' If you have any questions or comments please send an e-mail to FactWEB@npd.no.

Exploration wellbore: 34/7-28

General information

Wellbore history

General

Well 34/7-28 is located in the Tampen area in the Northern North Sea. It was drilled on a prospect situated north east of the Statfjord Nord field and east of the Snorre field. The well tested the NW III prospect, which was defined as a stratigraphic trap with pinch out of the Draupne Formation. The sands in the Draupne Formation were expected to be erosional products from the Snorre block positioned in a north east direction of the well.

Operations and results

Wildcat well 34/7-28 was spudded with the semi-submersible installation Transocean Leader on 30 December 1997. The well was initially drilled to a total depth of 1267 m in the 12 l/4" section where the decision was made to plug and abandon the well. The abandonment was due to concerns over the integrity of the 18 3/4" wellhead housing, which had suffered damage during BOP latching procedures. At this time a total of 24.9 days had been spent on the well. With the rig moved ca. 25 m NNE from the original location, well 34/7-28 was re-spudded on 24 January 1998 and drilled to TD at 3005 m in the Middle Jurassic Drake Formation. The final 34/7-28 well was drilled with sea water and bentonite hi-vis sweeps down to 1300 m, with silicate mud from 1300 m to 2165 m, and with KCl/glycol mud ("Aqaucol D" polypropylene glycols) from 2165 m to TD.

Apart from the Utsira Formation only traces of sand was penetrated above top Jurassic. Sandstones were encountered in the prospective level of the Viking Group. The uppermost sand at 2666 m was a 3 m thick Intra Draupne Formation sandstone overlying 10 m of Heather Formation shale. The lower sand at 2679 m was a 16 m thick Intra Heather Formation sandstone, interpreted as a gravitation deposit. Both sandstones were penetrated at shallower depth than the oil-water contact in Statfjord Nord and both were water filled. An undifferentiated sequence of water filled Rannoch/Etive Formations sandstones was penetrated from 2805 to 2972 m. Pressure measurements showed that the sands in the Viking group were in communication, but they were not in communication with the sands in the Brent Group. From this it was concluded that the base seal was intact, and the fault to the south west was sealing. Weak shows were described in the core from the Intra Heather Formation sandstone, but subsequent geochemical analyses in the laboratory were not able to confirm this. This was the only indication of hydrocarbons in the well.

Two cores were cut in the Intra Heather Formation sandstone and Heather Formation shale from 2668-2694 m and 2694-2726.5 m. The sands were massive and had good visible porosity. MDT pressure tests were carried out in the Viking Group and in the Brent Group. No fluid sampling was attempted.

The well was permanently abandoned on 3 March 1998 as a dry well.

Testing

No drill stem test was performed.

Cuttings available at the NPD

Interval [m]: 1310.00 - 2924.00

Cores available at the NPD

Core length [m]: 55.65

Scanned core photos

2668-2673m	2673-2678m	2678-2683m	2683-2688m	2688-2692m
2694-2699m	2699-2704m	2704-2709m	2709-2714m	2714-2719m
2719-2724m	2724-2725m

Palynological slides available at the NPD

Oil samples available at the NPD

No oil samples available.

Casing and leak-off tests

Mud

Drill stem test

No drill stem test in this wellbore.

Available logs

Lithostratigraphy

Composite log

No composite log presently available.

Geochemical information

You need an ACROBAT reader from ADOBE  to display the reports in pdf format.

Documents reported by the licencees (period for duty of secrecy expired)

No documents presently available.