30/9-7
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General information
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Wellbore history
GeneralWell 30/9-7 was drilled on the B-prospect in the Oseberg South area. The prospect is an easterly tilted fault block, separated from the Omega structure by a NNW-SSE trending normal fault. The objective was to prove oil in the Brent Group sandstones and define an oil/water contact.Operations and resultsWildcat well 30/9-7 was spudded with the semi-submersible installation Polar Pioneer on 2 November 1988 and drilled to TD at 3565 m in the Early Jurassic Nansen Formation. No significant problem was encountered in the operations. The well was drilled with spud mud down to 1072 m and KCl/polymer mud from 1072 m to TD.Well 30/9-7 encountered oil in the Brent Group, Tarbert Formation. No additional hydrocarbon bearing intervals were found. The Tarbert Formation (2810 - 2903 m) was oil bearing down to 2827 m (OWC from RFT). The net pay was estimated to be 13.6 m and average water saturation calculated to 37.9%. Average porosity was 21.2%. RFT results showed no pressure communication with well 30/9-4 in the Omega structure within the Tarbert Formation. Some oil shows were described in thin sandstone stringers at the base of the Våle Formation and down into limestones in the uppermost Shetland Group (2375 m to 2382 m). Below OWC in the Tarbert Formation, sandstones had no to weak petroleum odour and cut fluorescence down to 2880 m and brown dead oil stain and weak cut fluorescence down to 2885 m.Two cores were cut in the Tarbert Formation from 2832 m to 2888 m. RFT fluid samples were taken at 2818.2 m (oil, water and filtrate) and at 2828.6 m (water and filtrate).The well was suspended on 23 December 1988. It was permanently plugged and abandoned on 7 August 2003. It is classified as an oil discovery.TestingOne production test was performed in the interval 2811.0 - 2822.0 m in the Tarbert Formation. The test produced on average 540 Sm3 oil and 75600 Sm3 gas /day on a 12.7 mm choke. The GOR was 140 Sm3/Sm3, the oil density was 0.849 g/cc and the gas gravity 0.693 (air-1). The bottom hole temperature measured at 2759.7 m was 108.0 °C. The well produced 1% CO2 and no H2S. -
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]1080.003465.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12832.02857.8[m ]22860.02887.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]52.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDSTTEST12811.002822.0001.01.1989 - 00:00YES -
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 typeCONDUCTOR30207.036207.00.00LOTINTERM.13 3/81057.017 1/21072.01.68LOTINTERM.9 5/82756.012 1/42770.01.50LOTLINER72953.08 1/23565.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02811282212.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0540756000.8490.693140 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL22302755CBL VDL26902850CST27753480DIL LSS GR SP27553567DIL LSS LDL CNL GR SP10552769DLL MSFL GR27553190FEWD28173106LDL CNL NGT CAL27553565MWD1212770RFT HP AMS28123167SHDT23502768VSP11003290VSP11002870 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit12161591191120822082215022142318238023802613276827682791279128052810281029033093311031373168316832883387342635353535 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.20pdf3.60 -
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]pdf5.45pdf15.22 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3501.2511.05.0WATER BASED22.12.19883501.2511.05.0WATER BASED23.12.19883501.2511.05.0WATER BASED28.12.19886381.051.01.0WATER BASED07.11.198810721.051.01.0WATER BASED07.11.198810721.2012.05.0WATER BASED10.11.198813291.4519.09.0WATER BASED10.11.198813341.4520.08.0WATER BASED11.11.198816751.4521.010.0WATER BASED14.11.198819641.4524.010.0WATER BASED15.11.198822521.4525.09.0WATER BASED15.11.198823561.4525.07.0WATER BASED15.11.198823861.4520.06.0WATER BASED15.11.198824331.4522.06.0WATER BASED16.11.198825251.4523.06.0WATER BASED17.11.198825551.2511.05.0WATER BASED21.12.198825891.4520.06.0WATER BASED18.11.198826391.4523.06.0WATER BASED21.11.198827121.4521.06.0WATER BASED21.11.198827451.4522.05.0WATER BASED21.11.198827701.4521.06.0WATER BASED22.11.198827701.4521.07.0WATER BASED24.11.198827701.2616.06.0WATER BASED29.11.198828171.2522.08.0WATER BASED29.11.198828321.2511.09.0WATER BASED29.11.198828601.2511.09.0WATER BASED29.11.198828881.2511.05.0WATER BASED13.12.198828881.2511.05.0WATER BASED14.12.198828881.2511.05.0WATER BASED15.12.198828881.2511.05.0WATER BASED16.12.198828881.2511.05.0WATER BASED19.12.198828881.2511.05.0WATER BASED20.12.198828901.2511.09.0WATER BASED29.11.198829551.2511.05.0WATER BASED12.12.198829771.2511.010.0WATER BASED30.11.198830381.2512.012.0WATER BASED01.12.198831061.2514.010.0WATER BASED02.12.198831901.2512.09.0WATER BASED05.12.198832421.2513.09.0WATER BASED05.12.198833201.2610.06.0WATER BASED12.12.198833731.2513.08.0WATER BASED05.12.198834801.2514.07.0WATER BASED06.12.198835651.2512.05.0WATER BASED09.12.198835651.2612.05.0WATER BASED12.12.198835651.2511.05.0WATER BASED07.12.198835651.2512.05.0WATER BASED08.12.1988 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2100.0[m]DCSTRAT2110.0[m]DCSTRAT2120.0[m]DCSTRAT2130.0[m]DCSTRAT2140.0[m]DCSTRAT2150.0[m]DCSTRAT2160.0[m]DCSTRAT2170.0[m]DCSTRAT2180.0[m]DCSTRAT2190.0[m]DCSTRAT2200.0[m]DCSTRAT2210.0[m]DCSTRAT2220.0[m]DCSTRAT2230.0[m]DCSTRAT2240.0[m]DCSTRAT2250.0[m]DCSTRAT2260.0[m]DCSTRAT2270.0[m]DCSTRAT2280.0[m]DCSTRAT2290.0[m]DCSTRAT2300.0[m]DCSTRAT2310.0[m]DCSTRAT2320.0[m]DCSTRAT2330.0[m]DCSTRAT2340.0[m]DCSTRAT2350.0[m]DCSTRAT2360.0[m]DCSTRAT2370.0[m]DCSTRAT2380.0[m]DCSTRAT2390.0[m]DCSTRAT2400.0[m]DCSTRAT2420.0[m]DCSTRAT2440.0[m]DCSTRAT2460.0[m]DCSTRAT2480.0[m]DCSTRAT2500.0[m]DCSTRAT2520.0[m]DCSTRAT2540.0[m]DCSTRAT2560.0[m]DCSTRAT2580.0[m]DCSTRAT2600.0[m]DCSTRAT2625.0[m]DCSTRAT2640.0[m]DCSTRAT2680.0[m]DCSTRAT2700.0[m]DCSTRAT2715.0[m]DCSTRAT2735.0[m]DCSTRAT2755.0[m]DCSTRAT2775.0[m]SWCHYDRO2783.0[m]SWCHYDRO2787.5[m]SWCHYDRO2792.5[m]SWCHYDRO2795.0[m]SWCHYDRO2798.0[m]SWCHYDRO2800.0[m]SWCHYDRO2805.0[m]SWCHYDRO2810.0[m]SWCHYDRO2812.5[m]SWCHYDRO2813.0[m]SWCHYDRO2818.0[m]SWCHYDRO2822.5[m]SWCHYDRO2827.0[m]SWCHYDRO2833.0[m]SWCHYDRO2835.4[m]CHYDRO2840.5[m]CHYDRO2845.3[m]CHYDRO2850.3[m]CHYDRO2857.0[m]CHYDRO2866.5[m]CHYDRO2874.5[m]CHYDRO2879.5[m]CHYDRO2895.0[m]SWCHYDRO2907.0[m]SWCHYDRO2915.0[m]DCSTRAT2923.0[m]SWCHYDRO2932.0[m]DCSTRAT2941.0[m]SWCHYDRO2953.0[m]SWCHYDRO2964.0[m]SWCHYDRO2972.0[m]DCSTRAT2978.0[m]SWCHYDRO2986.0[m]SWCHYDRO2995.0[m]DCSTRAT3005.0[m]DCSTRAT3015.0[m]DCSTRAT3022.0[m]SWCHYDRO3025.0[m]DCSTRAT3032.0[m]DCSTRAT3033.0[m]SWCHYDRO3054.0[m]SWCHYDRO3062.0[m]DCSTRAT3072.0[m]DCSTRAT3087.0[m]SWCHYDRO3092.0[m]DCSTRAT3102.0[m]DCSTRAT3112.0[m]SWCHYDRO3120.0[m]SWCHYDRO3130.0[m]SWCHYDRO3140.0[m]DCSTRAT3150.0[m]DCSTRAT3160.0[m]SWCHYDRO3169.0[m]SWCHYDRO3180.0[m]SWCHYDRO3195.0[m]SWCHYDRO3202.0[m]DCSTRAT3212.0[m]DCSTRAT3220.0[m]SWCHYDRO3230.0[m]DCSTRAT3240.0[m]SWCHYDRO3250.0[m]DCSTRAT3260.0[m]DCSTRAT3270.0[m]SWCHYDRO3280.0[m]DCSTRAT3290.0[m]DCSTRAT3300.0[m]SWCHYDRO3310.0[m]DCSTRAT3320.0[m]DCSTRAT3330.0[m]DCSTRAT3337.0[m]DCSTRAT3347.0[m]DCSTRAT3357.0[m]DCSTRAT3365.0[m]SWCHYDRO3372.0[m]DCSTRAT3382.0[m]DCSTRAT3390.0[m]SWCHYDRO3397.0[m]DCSTRAT3405.0[m]SWCHYDRO3415.0[m]DCSTRAT3425.0[m]DCSTRAT3435.0[m]SWCHYDRO3442.0[m]DCSTRAT3450.0[m]DCSTRAT3457.0[m]SWCHYDRO3465.0[m]DCSTRAT3475.0[m]DCSTRAT3480.0[m]SWCHYDRO3490.0[m]DCSTRAT3500.0[m]DCSTRAT3510.0[m]DCSTRAT3520.0[m]DCSTRAT3530.0[m]DCSTRAT3540.0[m]DCSTRAT3550.0[m]DCSTRAT