30/9-10
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General information
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Wellbore history
GeneralWell 30/9-10 was drilled in the Omega South segment on the Oseberg Fault Block in the North Sea. The primary objective was to test the hydrocarbon potential in the Tarbert Formation. Secondary objectives were to test the Cook Formation and the Statfjord Group.Operations and resultsWildcat well was spudded with the semi-submersible installation Vildkat on 31 July 1990 and drilled to TD at 3649 m in the Early Jurassic Statfjord Group. An 8 1/2" pilot hole was drilled from 210 to 350 m to check a possible shallow gas zone at 329 m. No gas was encountered. No significant problem was encountered in the operations. The well was drilled with spud mud down to 1059 m and with KCl/polymer mud from 1059 m to TD.The Draupne Formation was encountered at 2717 m and Intra Draupne Formation sandstone was penetrated from 2756 m to top Tarbert Formation at 2783 m. The Draupne Formation sandstone and the Upper Tarbert Formation were found to be oil bearing from 2756 - 2833 m. Poor to moderate oil shows continued down to 2858 m. No oil shows were recorded below this depth or above top Draupne Formation. The Middle Tarbert is poor or tight, and non-moveable hydrocarbons were present in the Lower Tarbert, which are interpreted from core analysis to be residual oil. The net pay was determined to be 55 m, with an average water saturation of 36.4% and average porosity of 17.5%. RFT data defines an oil gradient through Draupne and Upper Tarbert sandstones, which intersects with the Lower Tarbert water gradient at 2833 m in the Middle Tarbert. However, it is uncertain whether the oil gradient in the Upper Tarbert and the water gradient of the Lower Tarbert belong to the same pressure system. Consequently an oil-water contact was not proven in the well. The Cook Formation and the Statfjord Group were found water bearing with no shows.Three cores were cut from 2725 m to 2732.5 m in the Draupne Formation. Poor recovery was obtained in these cores. Another four cores were cut from 2747 m in the Draupne Formation, through Intra Draupne Formation sandstone, the Tarbert Formation, and to 2894.5 m in the Ness Formation. Good recovery was obtained in these cores. RFT fluid samples were taken at 2775 m (oil, gas and water/filtrate) and 2822 m (oil, gas and water/filtrate).The well was suspended on 21 September 1990 as an oil discovery.TestingTwo drill stem tests were performed.DST 1A tested the interval 2757 - 2776 m in Intra Draupne Formation sandstones. It produced oil and gas at average rates of 379 Sm3/day and 42100 Sm3/day respectively on a 15.9 mm choke. The GOR was 111 Sm3/Sm3, with oil gravity 0.861 g/cc and gas gravity 0.754 (air =1). The flowing well head pressure was 43.6 bars and the bottom hole temperature 107.0 degrees C. The well produced 0.8% CO2 and no H2S.DST 1B tested the intervals 2757.0 - 2776.0 m Intra Draupne Formation sandstones and 2779.7 - 2824.7 m in upper Tarbert Formation. Oil flowed at an average rate of 986 Sm3/day and gas flowed at an average rate of 84800 Sm3/day on a 19.1 mm choke. The GOR was 86 Sm3/Sm3, with oil gravity 0.861 g/cc and gas gravity 0.754 (air=l). The flowing well head pressure was 80.8 bars and the bottom hole temperature 108.4 degrees C. The well produced 0.6% 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]1070.003642.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12725.02725.1[m ]22726.02729.0[m ]32730.02732.1[m ]42747.02771.0[m ]52774.52824.1[m ]62825.02871.3[m ]72872.52895.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]147.6Cores 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 availableDSTDST1A2757.002776.0010.12.1990 - 00:00YESDSTDST1B2779.702824.7010.12.1990 - 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 typeCONDUCTOR30209.036210.00.00LOTINTERM.13 3/81040.017 1/21059.01.87LOTINTERM.9 5/82701.012 1/42716.01.87LOTLINER72996.08 1/23649.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02757277615.92.02757282419.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.03794210000.8610.7541112.09868480000.8610.75486 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL21252690CST27023638DIL LSS GR SP AMS10412705DIL SDT GR SP AMS27622868DLL MSFL GR AMS27012891FMS4 GR AMS27023651LDL CNL10412685LDL CNL27012879LDL CNL GR AMS28203651LWD GR RES DIR210350MWD - GR RES DIR1243565NGL27022870NGL28203642RFT AMS27573103RFT AMS27622868RFT AMS36223634VSP22003650 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit12463484820572057213122002372268927172717275627842784287130963114311731173404342435023622 -
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]pdf3.43pdf26.04 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1241.20WATER BASED31.07.19902101.20WATER BASED01.08.19902241.20WATER BASED02.08.19903501.1611.010.0WATER BASED19.09.19904831.20WATER BASED03.08.199010591.20WATER BASED06.08.199010591.20WATER BASED06.08.199011321.2010.08.0WATER BASED06.08.199019841.4029.09.0WATER BASED09.08.199023061.4129.09.0WATER BASED10.08.199024651.4026.012.0WATER BASED13.08.199027161.4225.09.0WATER BASED13.08.199027161.4220.011.0WATER BASED14.08.199027161.4225.09.0WATER BASED13.08.199027251.2715.09.0WATER BASED15.08.199027301.2716.08.0WATER BASED16.08.199027471.2817.08.0WATER BASED17.08.199027741.2816.08.0WATER BASED20.08.199028251.2822.08.0WATER BASED20.08.199028731.2719.07.0WATER BASED20.08.199028951.9019.01.0WATER BASED21.08.199028951.2619.07.0WATER BASED22.08.199030021.2213.05.0WATER BASED31.08.199030021.2213.05.0WATER BASED03.09.199030021.2217.010.0WATER BASED03.09.199030021.2218.011.0WATER BASED04.09.199030021.2219.011.0WATER BASED05.09.199030021.2222.010.0WATER BASED06.09.199030021.2222.010.0WATER BASED07.09.199030021.1511.012.0WATER BASED10.09.199030021.1511.013.0WATER BASED10.09.199030021.1511.013.0WATER BASED10.09.199030021.1511.013.0WATER BASED11.09.199030021.1511.013.0WATER BASED13.09.199030021.1511.013.0WATER BASED14.09.199030021.1511.013.0WATER BASED17.09.199030021.1511.010.0WATER BASED17.09.199030021.1611.010.0WATER BASED18.09.199030021.2218.011.0WATER BASED03.09.199030021.1511.013.0WATER BASED17.09.199032581.2718.07.0WATER BASED23.08.199036491.2723.08.0WATER BASED27.08.199036491.2714.06.0WATER BASED27.08.199036491.2721.09.0WATER BASED27.08.199036491.2720.08.0WATER BASED29.08.199036491.2720.07.0WATER BASED29.08.1990 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1090.0[m]DCRRI1130.0[m]DCRRI1250.0[m]DCRRI1310.0[m]DCRRI1330.0[m]DCRRI1370.0[m]DCRRI1450.0[m]DCRRI1470.0[m]DCRRI1490.0[m]DCRRI1510.0[m]DCRRI1530.0[m]DCRRI1550.0[m]DCRRI1570.0[m]DCRRI1590.0[m]DCRRI1610.0[m]DCRRI1630.0[m]DCRRI1650.0[m]DCRRI1670.0[m]DCRRI1690.0[m]DCRRI1710.0[m]DCRRI1730.0[m]DCRRI1750.0[m]DCRRI1770.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1910.0[m]DCRRI1930.0[m]DCRRI1950.0[m]DCRRI1970.0[m]DCRRI1990.0[m]DCRRI2010.0[m]DCRRI2030.0[m]DCRRI2050.0[m]DCRRI2060.0[m]DCRRI2070.0[m]DCRRI2090.0[m]DCRRI2105.0[m]DCRRI2120.0[m]DCRRI2135.0[m]DCRRI2150.0[m]DCRRI2165.0[m]DCRRI2180.0[m]DCRRI2190.0[m]DCRRI2210.0[m]DCRRI2225.0[m]DCRRI2240.0[m]DCRRI2255.0[m]DCRRI2270.0[m]DCRRI2285.0[m]DCRRI2300.0[m]DCRRI2315.0[m]DCRRI2330.0[m]DCRRI2345.0[m]DCRRI2360.0[m]DCRRI2375.0[m]DCRRI2410.0[m]DCRRI2440.0[m]DCRRI2470.0[m]DCRRI2500.0[m]DCRRI2530.0[m]DCRRI2560.0[m]DCRRI2590.0[m]DCRRI2613.0[m]SWCHYDRO2620.0[m]DCRRI2650.0[m]DCRRI2685.0[m]DCRRI2703.0[m]SWCHYDRO2706.0[m]SWCHYDRO2709.0[m]SWCHYDRO2710.0[m]SWCHYDRO2712.0[m]SWCHYDRO2715.0[m]DCRRI2715.0[m]SWCHYDRO2719.0[m]SWCHYDRO2722.0[m]SWCHYDRO2723.0[m]SWCHYDRO2725.0[m]CHYDRO2726.2[m]CHYDRO2727.2[m]CHYDRO2728.8[m]CHYDRO2730.6[m]CHYDRO2731.9[m]CHYDRO2737.0[m]CHYDRO2740.5[m]SWCHYDRO2742.5[m]SWCHYDRO2745.0[m]SWCHYDRO2747.0[m]CHYDRO2748.8[m]CHYDRO2749.7[m]CHYDRO2750.3[m]CHYDRO2750.9[m]CHYDRO2755.2[m]CHYDRO2759.2[m]CHYDRO2763.3[m]CHYDRO2767.6[m]CHYDRO2769.9[m]CHYDRO2771.9[m]CHYDRO2773.4[m]CHYDRO2775.5[m]CHYDRO2777.5[m]CHYDRO2779.2[m]CHYDRO2781.1[m]CHYDRO2781.8[m]CHYDRO2782.0[m]CHYDRO2782.0[m]CHYDRO2792.0[m]CHYDRO2792.5[m]CHYDRO2796.6[m]CHYDRO2797.2[m]CHYDRO2803.1[m]CHYDRO2804.0[m]CHYDRO2812.7[m]CHYDRO2813.9[m]CHYDRO2815.0[m]CHYDRO2819.3[m]CHYDRO2825.1[m]CHYDRO2827.0[m]CHYDRO2830.6[m]CHYDRO2836.8[m]CHYDRO2839.2[m]CHYDRO2844.0[m]CHYDRO2845.9[m]CHYDRO2848.8[m]CHYDRO2851.1[m]CHYDRO2857.3[m]CHYDRO2864.5[m]CHYDRO2867.3[m]CHYDRO2868.1[m]CHYDRO2869.1[m]CHYDRO2872.5[m]CHYDRO2876.5[m]CHYDRO2883.0[m]CHYDRO2886.4[m]CHYDRO2891.3[m]CHYDRO2892.9[m]CHYDRO2899.0[m]CHYDRO2908.0[m]SWCHYDRO2914.5[m]SWCHYDRO2925.0[m]DCRRI2932.0[m]SWCHYDRO2947.0[m]SWCHYDRO2953.0[m]SWCHYDRO2965.0[m]DCRRI2975.0[m]DCRRI2984.0[m]SWCHYDRO2992.0[m]DCRRI3002.0[m]DCRRI3011.0[m]SWCHYDRO3022.0[m]DCRRI3026.0[m]SWCHYDRO3028.0[m]SWCHYDRO3036.0[m]SWCHYDRO3051.0[m]SWCHYDRO3066.0[m]SWCHYDRO3082.0[m]DCRRI3085.0[m]SWCHYDRO3091.5[m]SWCHYDRO3095.0[m]SWCHYDRO3109.0[m]SWCHYDRO3112.0[m]SWCHYDRO3115.5[m]SWCHYDRO3130.0[m]DCRRI3130.0[m]SWCHYDRO3131.0[m]SWCHYDRO3140.0[m]DCRRI3152.0[m]DCRRI3162.0[m]SWCHYDRO3172.0[m]DCRRI3180.0[m]SWCHYDRO3192.0[m]DCRRI3201.0[m]SWCHYDRO3212.0[m]DCRRI3232.0[m]DCRRI3242.0[m]DCRRI3248.0[m]SWCHYDRO3262.0[m]DCRRI3272.0[m]DCRRI3282.0[m]DCRRI3295.0[m]DCRRI3302.0[m]DCRRI3315.0[m]SWCHYDRO3322.0[m]DCRRI3332.0[m]DCRRI3342.0[m]DCRRI3352.0[m]DCRRI3362.0[m]DCRRI3372.0[m]DCRRI3382.0[m]DCRRI3392.0[m]DCRRI3402.0[m]DCRRI3412.0[m]DCRRI3425.0[m]SWCHYDRO3432.0[m]DCRRI3446.0[m]SWCHYDRO3452.0[m]DCRRI3462.0[m]DCRRI3478.5[m]SWCHYDRO3482.0[m]DCRRI3502.0[m]DCRRI3512.0[m]DCRRI3521.0[m]SWCHYDRO3532.0[m]DCRRI3542.0[m]DCRRI3552.0[m]DCRRI3562.0[m]DCRRI3572.0[m]DCRRI3582.0[m]DCRRI3591.0[m]SWCHYDRO3602.0[m]DCRRI3622.0[m]DCRRI3625.0[m]SWCHYDRO3637.0[m]DCRRI3638.0[m]SWCHYDRO3646.0[m]DCRRI