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Exploration wellbore: 34/8-1

General information

Wellbore history

General

Well 34/8-1 was drilled on the main prospect "A" in the block. A main rotated fault block flanking the Viking Graben defines the prospect. The closure of the prospect was mainly dependant upon a sealing fault separating the prospect from the structurally higher Gullfaks area. The main objectives of the well were to prove possible hydrocarbon accumulations in the structurally and stratigraphically highest reservoir zone (the Brent Group) in an optimal position, to verify the interpretation regarding the stratigraphic and structural evolution, and to drill in a position that tested both the structural closure and the sealing fault on the "A" prospect.

Secondary objectives of the well were to test the hydrocarbon potential, the stratigraphy and the reservoir quality in the Cook, Statfjord, and upper Lunde Formations; to drill in a position where the Brent Group showed no or minor erosion; and to drill in a position which left small quantities of hydrocarbons untested up dip in the Brent Group. The prognosed depth was 3750 m, ca 100 m into sands of the upper Lunde Formation.

Operations and results

Wildcat well 34/8-1 was spudded with the semi-submersible installation "Treasure Scout" 11 November 1985 and drilled to a total depth of 3610 m in the Triassic Lunde Formation. Certain problems were experienced in the beginning, and the well had to be re-spudded. After this drilling proceeded without significant problems. The well was drilled with sea water and hi-vis pills down to 925 m and with KCl polymer mud from 925 m to TD. The well penetrated a near complete Brent Group. The reservoir top came in at 2767 m, approx. 80 a higher than prognosed. Logs and RFT data show that it is a probability of gas down to 2854 and the oil/water contact is at 2864 m. Thirteen cores were cut in the well, 10 cores in the Brent Group, one in the Cook Formation, and one in the Lunde Formation. Two sets of segregated RFT samples were retrieved from 2852.5 m and 2858 m, in the gas zone and one in the oil zone respectively.

The well was plugged and abandoned on 8 March 1986 as an oil and gas discovery.

Testing

Three drill stem tests were performed in the well, DST 1 in the water zone, DST 2 in the oil zone and DST 3 in the gas zone. DST 2 experienced gas coning which could indicate that the oil is difficult to produce.

Cuttings available at the NPD

Interval [m]: 430.00 - 3610.00

Cores available at the NPD

Core length [m]: 226.31

Scanned core photos

2768-2774m	2774-2780m	2780-2786m	2786-2792m	2792-2794m
2794-3000m	2800-2806m	2806-2812m	2812-2818m	2818-2822m
2822-2828m	2828-2831m	2840-2845m	2845-2851m	2851-2853m
2854-2860m	2860-2867m	2866-2872m	2872-2878m	2878-2882m
2882-2888m	2888-2893m	2894-2900m	2900-2906m	2906-2912m
2912-2918m	2918-2920m	2920-2925m	2926-2929m	2929-2935m
2935-2941m	2941-2947m	2947-2950m	2947-2953m	2953-2959m
2959-2965m	2965-2971m	2971-2975m	3062-3065m	3044-3050m
3050-3056m	3056-3062m	3294-3300m	3300-3306m	3306-3312m
3312-3316m	3512-3518m	3518-3521m

Palynological slides available at the NPD

No palynological slides in this wellbore.

Oil samples available at the NPD

Casing and leak-off tests

Mud

Drill stem test (intervals and pressures)

Drill Stem Test (recovery)

Available logs

Lithostratigraphy

Composite log

Composite log (Format:PDF. Size: 0.567 Mb)
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Geochemical information

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

No documents presently available.

Old NPD WDSS reports, NPD papers and other related documents

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