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Exploration wellbore: 34/7-9

General information

Wellbore history

General

Well 34/7 9 was drilled on the Snorre structure in the northernmost part of the block. The main objective of the well was to test the hydrocarbon potential of the upper Lunde Formation in the Snorre structure.

Operations and results

Appraisal well 34/7-9 was spudded with the semi-submersible installation Treasure Saga on 13 April 1986 and drilled to TD at 3240 m in the Late Triassic Lunde Formation. Minor shallow gas peaks were observed from mud gas readings in the pilot hole below the 30" casing at 498 - 500 m. Drilling proceeded without significant problems. The well was drilled with spud mud down to 471 m, with gel mud from 471 m to 915 m, with gypsum/polymer mud from 915 m to 2479 m, and with gel mud from 2479 m to TD.

Well 34/7-9 penetrated the reservoir at 2442.5 m, 50 m deeper than prognosed. From FMT pressure points the the oil water contact (OWC) was defined in the upper Lunde at 2600 m (2574 m MSL). The average log porosity in the oil zone was 25.6%, the net/gross was 0.24, and the average water saturation was 30%.

Shows were seen from 2100 to 2315 m in the Shetland Group. Below 2315 m the shows disappeared and did not reappear before the upper Lunde reservoir was penetrated at 2442.5 m. Down to a sandstone/claystone boundary at 2594 m, the sandstones showed a pale brown oil stain, fair to good odour, 100% - 90% strong, patchy, yellow to light yellow fluorescence, fast to instant streaming bluish white cut and a pale yellow residue upon evaporation. Below 2594 m no shows were seen.

A total of 10 cores were cut and recovered during drilling of the well. The cores were taken in the upper Lunde Formation from 2470.0 to 2720.5 m core depth. The average core recovery was 96.7%. Logger's depths for the cores were from 1.75 to 4.00 m shallower than the core depths. FMT fluid samples were taken at 2585 m and 2592 m. All analysed sample chambers contained black oil and brown-grey water with sediments.

The well was permanently abandoned on 12 June 1986 as an oil appraisal.

Testing

One DST was carried out with four zones in the upper Lunde Formation flowing simultaneously: 2501 - 2504 m, 2506 - 2515 m, 2527 - 2536 m, and 2550 - 2553. The zones were flowed for 175 hours, followed by a build-up of 50 hours. During the main flow period the flow rate through a 15.9 mm choke decreased from 1400 Sm3 /day to 896 Sm3 /day and the corresponding wellhead pressure decreased from 130 to 93 bar. Fluid analyses of pressurized samples from the test gave a GOR of 103 Sm3/Sm3 and stock tank oil density of 0.8258 g/cm3. The maximum temperature recorded at reference depth, mid-perforations, was 93.3 deg C.

Cuttings available at the NPD

Interval [m]: 480.00 - 3240.00

Cores available at the NPD

Core length [m]: 243.95

Scanned core photos

2470-2475m	2475-2480m	2480-2485m	2485-2490m	2490-2495m
2495-2499m	2499-2504m	2504-2509m	2509-2514m	2514-2518m
2518-2523m	2523-2528m	2528-2533m	2533-2538m	2538-2543m
2543-2546m	2546-2551m	2551-2556m	2556-2561m	2561-2566m
2566-2571m	2571-2574m	2574-2579m	2579-2584m	2584-2589m
2589-2593m	2593-2598m	2598-2603m	2603-2608m	2615-2620m
2620-2625m	2625-2630m	2630-2635m	2635-2640m	2640-2642m
2643-2648m	2648-2653m	2653-2658m	2658-2663m	2663-2668m
2668-2670m	2670-2675m	2675-2679m	2680-2685m	2685-2690m
2690-2694m	2692-2697m	2697-2702m	2702-2707m	2707-2712m
2712-2717m	2717-2621m

Palynological slides available at the NPD

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

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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