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Exploration wellbore: 34/7-2

General information

Wellbore history

General

Well 34/7-2 was drilled just north of the Tordis &st discovery in the northern North Sea. The main objectives were to test for hydrocarbons in the Jurassic Statfjord Formation and in the Triassic Lunde Formation.

Operations and results

Wildcat well 34/7-2 was spudded with the semi-submersible installation Treasure Saga on 2 September 1984 and drilled to TD at 2475 m in the Late Triassic Lunde Formation. A total of 83 hours rig time was NPT due to repairs resulting from a failed RIH with the 26" bit after underreaming to 816 m, and a leak in the acoustic system discovered after setting the 9 5/8" casing at 2031 m. The well was drilled with seawater and hi-vis pills down to 848 m, with KCl/polymer mud from 848 m to 2042 m, and with lignosulfonate mud from 2042 m to TD. No shallow gas was encountered.

Except for the sandy Utsira Formation and two sandstone units in the Hordaland Group (in the order of 40 - 50 m each) the well proved mainly claystones down to the Statfjord Formation at 2152 m. At BCU (2085 m) there was a major hiatus from Pliensbachian to Campanian. The Lunde Formation was encountered at 2271 m. The gross thickness of the Statfjord in this well is 119 m with 43.5 m of net sand. The well drilled some 204 m into the Lunde Formation, which in the upper part proved a siltstone sequence with minor sandstone and claystone, while the lowermost 117 m proved a sequence of sandstones alternating with claystones. Of this sequence some 41.3 m could be considered as net. No live hydrocarbons were encountered by the well. Residual oil was found in base Amundsen - top Statfjord Formations, however, cores showed low porosity and essentially no net sand. Extraction data from geochemical analyses also indicate migrated hydrocarbons in the Shetland Group.

Three cores totalling 28.8 m (recovered 22 m, 76% recovery) were cut across the stratigraphic border zone between Amundsen Formation (Dunlin Group) and Upper Statfjord Formation. The FMT tool was run to acquire pressure data and one FMT fluid sample was taken at 2110.5 m. It recovered only mud filtrate.

The well was permanently abandoned on 10 October 1984 as a dry well.

Testing

No drill stem test was performed.

Cuttings available at the NPD

Interval [m]: 420.00 - 2475.00

Cores available at the NPD

Core length [m]: 23.60

Scanned core photos

2147-2153m	2153-2158m	2159-2160m	2161-2164m	2168-2174m
2174-2175m

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

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

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Old NPD WDSS reports, NPD papers and other related documents

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