30/8-1 S
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General information
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Wellbore history
GeneralWell 30/8-1 S was drilled in the Viking Graben of the North Sea, just west of the Oseberg Fields. The objective was to test the hydrocarbon potential of the Jurassic Brent Group and Statfjord Formation. The well was committed to drill into the Hegre Group or to a maximum depth of 5026 m TVD.Operations and resultsWildcat well 30/8-1 S was spudded with the semi-submersible installation Treasure Saga on 1 November 1994 and drilled to TD at 4688 m in the Early Jurassic Amundsen Formation. No shallow gas was observed in the well. A kick was taken at 4055 m, where 0.8 m3 was gained over a 30 minute interval on drilling and 1.8 m3 gained on flow checking before shutting in the well. The kick was circulated out through the choke manifold and the well was killed with heavy mud. When logging the 12 1/4" section the tools got stuck several times. On a short wiper trip to the 9 5/8" casing shoe a 2.5 m3 kick was taken when circulating and 1.67 m3 while flow checking. Again the well was killed with heavy mud. Frequent mud losses were experienced in the final 8 3/8" section from 4332 to TD. The well was drilled with spud mud down to 1360 m, with KCl/polymer mud from 1360 m to 4058 m, and with Ancoterm High Temperature water based mud from 4058 m to TD.The main reservoir interval consisted of the Middle and Lower Tarbert Formations, but the Ness and the ORE Formations were also encountered. Hydrocarbons were encountered in the Tarbert Formation in a gas-down-to situation at 3687 m (3525.8 m TVD). Net sand is 109.9 m, with net pay of 84.7 m. An additional thin hydrocarbon-bearing zone is indicated in sandstones of the Ness Formation at 3884 - 3888 m. The formation pressure data indicate a clear Tarbert Gas gradient (rich gas), and a water gradient in the underlying interval. There is no pressure communication between the hydrocarbon bearing zone and the water zone in the well position. The pressure regime in the Brent Group was higher than anticipated. Weak oil shows were encountered in the Late Maastrichtian. Gas shows were encountered in the Heather Formation and in the Brent Group.A total of 203 m core was recovered in 13 cores from the Heather, Tarbert, and Ness Formations. A wire line water sample was taken at 3734.9 m.The well was suspended on 1 March 1995 due to environmental regulations. It is classified as a gas/condensate discovery. It was re-entered later same year to fulfil the drilling commitment and to test the Brent and possible Statfjord discoveries.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]1370.003317.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13457.03461.4[m ]23526.03527.0[m ]33563.03572.8[m ]43572.93600.5[m ]53601.03615.5[m ]63616.03620.7[m ]73621.03648.7[m ]83648.73677.7[m ]93677.73700.8[m ]103701.03709.7[m ]113710.33739.7[m ]123739.73742.2[m ]133743.03754.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]194.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30231.036231.00.00LOTSURF.COND.18 5/81346.0241360.00.00LOTINTERM.13 3/82701.017 1/22716.00.00LOTINTERM.9 5/84319.012 1/44332.00.00LOTLINER74688.08 3/84688.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL27004279CST13962693DLL MSFL LDL LSS13464663FMS28804110GR1221346LDL CNL27024111RFT35674093VELOCITY5204688 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit122599908958958103012561304141714982100210021742260241024442444247227253223324333613361343334333774409241234123445044644556 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf17.26 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5561.05water based13601.20water based13631.4023.0water based15101.4039.0water based22401.4243.0water based23621.4246.0water based23671.4237.0water based24911.4239.0water based26051.4241.0water based27161.4243.0water based30401.2733.0water based31891.2732.0water based34571.2735.0water based35321.5540.0water based35731.5543.0water based36451.5543.0water based37101.5543.0water based38531.5542.0water based39451.5544.0water based40551.6438.0water based41721.6444.0water based42051.7048.0water based42261.7046.0water based42471.7039.0water based43321.7447.0water based43351.7422.0water based46882.0442.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1369.0[m]SWCGEOST1390.0[m]SWCGEOST1401.0[m]SWCGEOST1430.0[m]SWCGEOST1450.0[m]SWCGEOST1470.0[m]SWCGEOST1490.0[m]SWCGEOST1514.0[m]SWCGEOST1530.0[m]SWCGEOST1550.0[m]SWCGEOST1570.0[m]SWCGEOST1590.0[m]SWCGEOST1610.0[m]SWCGEOST1630.0[m]SWCGEOST1650.0[m]SWCGEOST1670.0[m]SWCGEOST1690.0[m]SWCGEOST1710.0[m]SWCGEOST1730.0[m]SWCGEOST1750.0[m]SWCGEOST1770.0[m]SWCGEOST1790.0[m]SWCGEOST1810.0[m]SWCGEOST1830.0[m]SWCGEOST1840.0[m]SWCGEOST1860.0[m]SWCGEOST1870.0[m]SWCGEOST1890.0[m]SWCGEOST1910.0[m]SWCGEOST1930.0[m]SWCGEOST1946.0[m]SWCGEOST1970.0[m]SWCGEOST1990.0[m]SWCGEOST2010.0[m]SWCGEOST2017.0[m]SWCGEOST2050.0[m]SWCGEOST2062.0[m]SWCGEOST2077.0[m]SWCGEOST2090.0[m]SWCGEOST2099.0[m]SWCGEOST2110.0[m]SWCGEOST2117.0[m]SWCGEOST2130.0[m]SWCGEOST2140.0[m]SWCGEOST2150.0[m]SWCGEOST2160.0[m]SWCGEOST2170.0[m]SWCGEOST2182.0[m]SWCGEOST2190.0[m]SWCGEOST2200.0[m]SWCGEOST2210.0[m]SWCGEOST2220.0[m]SWCGEOST2230.0[m]SWCGEOST2234.0[m]SWCGEOST2240.0[m]SWCGEOST2248.0[m]SWCGEOST2250.0[m]SWCGEOST2260.0[m]SWCGEOST2270.0[m]SWCGEOST2280.0[m]SWCGEOST2287.0[m]SWCGEOST2295.0[m]SWCGEOST2300.0[m]SWCGEOST2313.0[m]SWCGEOST2320.0[m]SWCGEOST2327.0[m]SWCGEOST2345.0[m]SWCGEOST2350.0[m]SWCGEOST2362.0[m]SWCGEOST2366.0[m]SWCGEOST2380.0[m]SWCGEOST2390.0[m]SWCGEOST2400.0[m]SWCGEOST2410.0[m]SWCGEOST2420.0[m]SWCGEOST2425.0[m]SWCGEOST2432.0[m]SWCGEOST2442.0[m]SWCGEOST2450.0[m]SWCGEOST2470.0[m]SWCGEOST2480.0[m]SWCGEOST2500.0[m]SWCGEOST2520.0[m]SWCGEOST2540.0[m]SWCGEOST2560.0[m]SWCGEOST2580.0[m]SWCGEOST2604.0[m]SWCGEOST2620.0[m]SWCGEOST2640.0[m]SWCGEOST2660.0[m]SWCGEOST2693.0[m]SWCGEOST2700.0[m]SWCGEOST2720.0[m]SWCGEOST2740.0[m]SWCGEOST2760.0[m]SWCGEOST2780.0[m]SWCGEOST2800.0[m]SWCGEOST2820.0[m]SWCGEOST2840.0[m]SWCGEOST2860.0[m]SWCGEOST2880.0[m]SWCGEOST2900.0[m]SWCGEOST2920.0[m]SWCGEOST2940.0[m]SWCGEOST2960.0[m]SWCGEOST2980.0[m]SWCGEOST3000.0[m]SWCGEOST3020.0[m]SWCGEOST3040.0[m]SWCGEOST3060.0[m]SWCGEOST3080.0[m]SWCGEOST3100.0[m]SWCGEOST3120.0[m]SWCGEOST3140.0[m]SWCGEOST3160.0[m]SWCGEOST3180.0[m]SWCGEOST3200.0[m]SWCGEOST3220.0[m]SWCGEOST3240.0[m]SWCGEOST3245.0[m]SWCGEOST3255.0[m]SWCGEOST3260.0[m]SWCGEOST3280.0[m]SWCGEOST3300.0[m]SWCGEOST3320.0[m]SWCGEOST3330.0[m]SWCGEOST3340.0[m]SWCGEOST3350.0[m]SWCGEOST3360.0[m]SWCGEOST3370.0[m]SWCGEOST3380.0[m]SWCGEOST3390.0[m]SWCGEOST3400.0[m]SWCGEOST3410.0[m]SWCGEOST3420.0[m]SWCGEOST3430.0[m]SWCGEOST3440.0[m]SWCGEOST3447.0[m]CGEOST3450.0[m]SWCGEOST3457.0[m]CGEOST3460.0[m]CGEOST3461.0[m]CGEOST3462.0[m]SWCGEOST3470.0[m]SWCGEOST3500.0[m]SWCGEOST3510.0[m]SWCGEOST3520.0[m]SWCGEOST3527.0[m]CGEOST3530.0[m]SWCGEOST3540.0[m]SWCGEOST3550.0[m]SWCGEOST3560.0[m]SWCGEOST3565.0[m]SWCGEOST3568.0[m]CGEOST3569.0[m]CGEOST3570.0[m]CGEOST3571.0[m]CGEOST3573.0[m]CGEOST3578.0[m]CGEOST3584.0[m]CGEOST3593.0[m]CGEOST3596.0[m]CGEOST3604.0[m]CGEOST3614.0[m]CGEOST3627.0[m]CGEOST3639.0[m]CGEOST3643.0[m]CGEOST3646.0[m]CGEOST3649.0[m]CGEOST3650.0[m]CGEOST3662.0[m]CGEOST3669.0[m]CGEOST3674.0[m]CGEOST3686.0[m]CGEOST3690.0[m]CGEOST3692.0[m]CGEOST3696.0[m]CGEOST3701.0[m]CGEOST3705.0[m]CGEOST3712.0[m]CGEOST3713.0[m]CGEOST3716.0[m]CGEOST3722.0[m]CGEOST3732.0[m]CGEOST3741.0[m]CGEOST3748.0[m]CGEOST3751.0[m]CGEOST3754.0[m]CGEOST3755.0[m]CGEOST3762.0[m]SWCGEOST3770.0[m]SWCGEOST3777.0[m]SWCGEOST3785.0[m]SWCGEOST3792.0[m]SWCGEOST3800.0[m]SWCGEOST3807.0[m]SWCGEOST3815.0[m]SWCGEOST3822.0[m]SWCGEOST3830.0[m]SWCGEOST3837.0[m]SWCGEOST3845.0[m]SWCGEOST3850.0[m]SWCGEOST3860.0[m]SWCGEOST3867.0[m]SWCGEOST3875.0[m]SWCGEOST3882.0[m]SWCGEOST3890.0[m]SWCGEOST3897.0[m]SWCGEOST3905.0[m]SWCGEOST3912.0[m]SWCGEOST3920.0[m]SWCGEOST3927.0[m]SWCGEOST3935.0[m]SWCGEOST3942.0[m]SWCGEOST3950.0[m]SWCGEOST3957.0[m]SWCGEOST3965.0[m]SWCGEOST3972.0[m]SWCGEOST3980.0[m]SWCGEOST3987.0[m]SWCGEOST3995.0[m]SWCGEOST4002.0[m]SWCGEOST4010.0[m]SWCGEOST4017.0[m]SWCGEOST4025.0[m]SWCGEOST4032.0[m]SWCGEOST4040.0[m]SWCGEOST4047.0[m]SWCGEOST4055.0[m]SWCGEOST4062.0[m]SWCGEOST4070.0[m]SWCGEOST4077.0[m]SWCGEOST4085.0[m]SWCGEOST4092.0[m]SWCGEOST4100.0[m]SWCGEOST4107.0[m]SWCGEOST4115.0[m]SWCGEOST4125.0[m]SWCGEOST4165.0[m]SWCGEOST4205.0[m]SWCGEOST4225.0[m]SWCGEOST4265.0[m]SWCGEOST4285.0[m]SWCGEOST4305.0[m]SWCGEOST4322.0[m]SWCGEOST4332.0[m]SWCGEOST4350.0[m]SWCGEOST4370.0[m]SWCGEOST4390.0[m]SWCGEOST4410.0[m]SWCGEOST4430.0[m]SWCGEOST4450.0[m]SWCGEOST4470.0[m]SWCGEOST4490.0[m]SWCGEOST4510.0[m]SWCGEOST4530.0[m]SWCGEOST4550.0[m]SWCGEOST4572.0[m]SWCGEOST4590.0[m]SWCGEOST4610.0[m]SWCGEOST4630.0[m]SWCGEOST4650.0[m]SWCGEOST4670.0[m]SWCGEOST4677.0[m]SWCGEOST4687.0[m]SWCGEOST