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Exploration wellbore: 30/9-14

General information

Wellbore history

General

Well 30/9-14 is located in the western part of block 30/9, on the Southern Oseberg complex. The primary objectives of the well were to appraise oil within the G-North prospect and verify the potential resources of the G-North and G-West prospect, leaving a minimum of untested resources up dip of the well on the G-North prospect; to define fluid contacts, primarily the OWC in the Tarbert Formation; and to verify the structural mapping, depth conversion and the geological model for the G-North area. Secondary objectives were to verify the lateral extent of the lower Heather sand, to test a possible hydrocarbon potential within the Ness and ORE (Oseberg/Rannoch/Etive) Formations, and to obtain a good well tie of the base Brent reflector and the intra Dunlin reflector.

Operations and results

Appraisal well 30/9-14 was spudded with the semi-submersible installation "Polar Pioneer" on 16 March 1993 and drilled to total depth at 3680 m in the Early Jurassic Drake Formation. The well was drilled water based with sea water and hi-vis pills in the 36", 24", and 17 1/2" sections, down to 1040 m, and with a KCl / PHPA / Polymer mud from 104 m to TD. Sedimentological and lithological development was similar to 30/9-13 S, but approximately 250 m of Early Oligocene sand encountered in well 30/9-13 S was not present in well 30/9-14 where the same interval is dominated by clay stone. The Viking Group came in at 2967 m and the Top Tarbert Formation came in at 3059.5 m, 84 m deeper than prognosis due to too low velocities in the Tertiary section. Sixty-six m of Intra Heather Sandstone was verified from 2993.5 m to 3059.5 m. Poor to moderate shows were observed in the Draupne and Heather Formations from 2968.5 m to 3059.5 m. Moderate to good shows were seen from 3059.6 m to 3130 m in the Tarbert Formation. Good shows (residual oil) were also observed in the ORE Formation from 3503 - 3514 m. The Lower Heather and upper Tarbert Formations were proven to be gas bearing, with a GDT at 3163 m. Oil was encountered in Tarbert with an OWC at 3218 m. There was a four bar pressure difference, in the oil zone, between 30/9-13S and 30/9-14. The water gradient was similar to 30/9-13S. Eight conventional cores with near 100% recovery were cut in the interval 2968 m to 3219 m (Draupne, Heather, and Tarbert Formations). Three further cores were cut from 3470 m to 3534 m (Ness, ORE, and Drake Formations). Wireline MDT samples were recoverd from 3154.3 m (Tarbert Formation, water), 3126 m (Tarbert Formation, oil), and 3060.5 m (top Tarbert, Gas). An additional RFT sample containing gas was recovered from 3060.5 m. The well was plugged back and permanently abandoned as an oil and gas appraisal well on 14 May 1993.

Testing

The well was production tested from two intervals. Test no. 1 was perforated at 3144.5 m - 3157.5 m and produced water. Test no. 2 was perforated at 3084.0 m - 3127.0 m and produced saturated oil. Production test no. 1 was interpreted to flow from a net pay interval of 22.5 m with an average permeability of 478 mD. Test no. 2 was producing from a net pay interval of 14.25 m with an average permeability of 123 mD.

Cuttings available at the NPD

Interval [m]: 490.00 - 3680.00

Cores available at the NPD

Core length [m]: 310.00

Scanned core photos

2968-2973m	2973-2978m	2978-2980m	2981-2985m	2985-2990m
2990-2995m	2995-3000m	3000-3003m	3003-3008m	3008-3013m
3013-3018m	3018-3023m	3023-3028m	3028-3031m	3031-3036m
3036-3041m	3041-3046m	3046-3051m	3051-3056m	3056-3058m
3059-3063m	3063-3068m	3068-3073m	3073-3078m	3078-3083m
3088-3093m	3093-3098m	3098-3103m	3103-3108m	3108-3113m
3113-3113m	3113-3118m	3118-3123m	3123-3128m	3128-3133m
3133-3138m	3138-3143m	3143-3148m	3148-3153m	3153-3158m
3158-3163m	3163-3166m	3166-3171m	3171-3176m	3176-3181m
3181-3186m	3186-3191m	3191-3196m	3196-3201m	3201-3206m
3206-3211m	3211-3216m	3216-3218m	3470-3475m	3475-3480m
3480-3485m	3485-3490m	3490-3495m	3495-3500m	3500-3501m
3500-3508m	3508-3513m	3513-3518m	3518-3523m	3523-3528m
3528-3533m	3533-3534m

Palynological slides available at the NPD

Oil samples available at the NPD

Casing and leak-off tests

Mud

Drill stem test

No drill stem test in this wellbore.

Available logs

Lithostratigraphy

Composite log

Composite log (Format:PDF. Size: 0.735 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.