30/9-11 A
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General information
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Wellbore history
GeneralWell 30/9-11 A was drilled as a sidetrack to well 30/9-11 on the J-structure on the Oseberg Sør field in the North Sea.The vertical 30/9-11 well drilled a dry Brent group in J-East segment. The sidetrack targeted the J-Central segment and should penetrate top of the Brent Group in a down flank position in order to confirm deep oil filling of the J-Central segment, where oil previously had been discovered by well 30/9-9. The primary target was the Brent Group. Secondary target was the Cook Formation.Operations and resultsWell 30/9-11 A was kicked off from 920 m in 30/9-11 on 20 November 1990. The well was drilled with the semi-submersible installation Vildkat to TD at 3002 m (2735 m TVD) in Early Jurassic sediments of the Statfjord Group. Apart from some tight hole problems and close to seven days wait on weather operations proceeded without significant problems. The well was drilled with KCl/polymer mud from kick-off to TD.Top Viking Group, Heather Formation was encountered at 2513 m and top Brent Group, Ness Formation was encountered at 2553 m. The Ness Formation was water bearing, however moderate oil shows with strong petroleum odour was described on cores from top off the Ness Formation down to 2570 m. These shows were confirmed by relatively high organic geochemical extract yields with oil-mature biomarkers. Poor shows were described also in Shetland Group limestone from 2455 to 2457 m and in Heather Formation claystone from 2517 to 2520 m. Otherwise there were no indications of hydrocarbons in the well.Three cores were cut in from 2545 to 2582 m in the Heather, Tarbert, and Ness Formation. A fourth core was cut from 2652 to 2660 m in the lower Ness Formation. Good recovery was obtained in all cores. RFT water samples were taken at 2551.6 m and 2558 m.The well was permanently abandoned on 29 December 1990 as a dry well with shows.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]930.003002.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12545.02552.2[m ]22553.02575.0[m ]32576.02578.0[m ]42652.02660.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]39.1Cores 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 typeCONDUCTOR30243.036245.00.00LOTINTERM.13 3/8906.017 1/2922.00.00LOTINTERM.9 5/82394.012 1/42425.01.63LOTOPEN HOLE3002.08 1/23002.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR24312823DIL LSS GR SP AMS9062873DLL GR SP CAL AMS25252700DLL MSFL GR SP CAL AMS23932996FMS4 GR23962828LDL CNL LSS CAL AMS9052872MWD - GR RES DIR8842993RFT AMS25512660RFT AMS25510RFT AMS25580VSP13802810 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit91020922092213721952360236523652498251325132551255125532667267926802680283628752973 -
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]pdf1.97pdf33.35 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1701.27WATER BASED27.12.19908501.4213.07.0WATER BASED20.11.199010371.4220.09.0WATER BASED21.11.199013411.4321.011.0WATER BASED22.11.199017051.4622.010.0WATER BASED23.11.199020701.4619.09.0WATER BASED27.11.199022051.4819.09.0WATER BASED27.11.199022391.4823.010.0WATER BASED27.11.199023211.4824.08.0WATER BASED27.11.199023791.4823.010.0WATER BASED28.11.199024191.4720.08.0WATER BASED30.11.199024191.4718.09.0WATER BASED04.12.199024191.4824.011.0WATER BASED29.11.199024221.4719.011.0WATER BASED04.12.199024221.4418.09.0WATER BASED04.12.199024251.4721.09.0WATER BASED04.12.199024801.2717.06.0WATER BASED05.12.199025531.2718.09.0WATER BASED10.12.199025821.2717.07.0WATER BASED10.12.199026521.2717.07.0WATER BASED10.12.199026651.2714.08.0WATER BASED10.12.199026711.2714.0WATER BASED10.12.199029731.2714.06.0WATER BASED12.12.199030021.2714.06.0WATER BASED13.12.199030021.3315.010.0WATER BASED14.12.199030021.3315.010.0WATER BASED18.12.199030021.3315.011.0WATER BASED18.12.199030021.2712.09.0WATER BASED18.12.199030021.2711.09.0WATER BASED18.12.199030021.2710.09.0WATER BASED19.12.199030021.2711.010.0WATER BASED27.12.199030021.2712.09.0WATER BASED27.12.199030021.2714.06.0WATER BASED13.12.199030021.2711.010.0WATER BASED21.12.1990 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory940.0[m]DCSTRAT960.0[m]DCSTRAT970.0[m]DCSTRAT990.0[m]DCSTRAT1000.0[m]DCSTRAT1020.0[m]DCSTRAT1030.0[m]DCSTRAT1050.0[m]DCSTRAT1060.0[m]DCSTRAT1080.0[m]DCSTRAT1090.0[m]DCSTRAT1110.0[m]DCSTRAT1120.0[m]DCSTRAT1140.0[m]DCSTRAT1150.0[m]DCSTRAT1170.0[m]DCSTRAT1180.0[m]DCSTRAT1200.0[m]DCSTRAT1210.0[m]DCSTRAT1230.0[m]DCSTRAT1240.0[m]DCSTRAT1260.0[m]DCSTRAT1270.0[m]DCSTRAT1290.0[m]DCSTRAT1300.0[m]DCSTRAT1320.0[m]DCSTRAT1330.0[m]DCSTRAT1350.0[m]DCSTRAT1360.0[m]DCSTRAT1380.0[m]DCSTRAT1390.0[m]DCSTRAT1410.0[m]DCSTRAT1420.0[m]DCSTRAT1440.0[m]DCSTRAT1450.0[m]DCSTRAT1470.0[m]DCSTRAT1480.0[m]DCSTRAT1500.0[m]DCSTRAT1520.0[m]DCSTRAT1530.0[m]DCSTRAT1550.0[m]DCSTRAT1560.0[m]DCSTRAT1580.0[m]DCSTRAT1590.0[m]DCSTRAT1610.0[m]DCSTRAT1620.0[m]DCSTRAT1640.0[m]DCSTRAT1650.0[m]DCSTRAT1670.0[m]DCSTRAT1690.0[m]DCSTRAT1700.0[m]DCSTRAT1720.0[m]DCSTRAT1730.0[m]DCSTRAT1750.0[m]DCSTRAT1760.0[m]DCSTRAT1780.0[m]DCSTRAT1790.0[m]DCSTRAT1810.0[m]DCSTRAT1820.0[m]DCSTRAT1840.0[m]DCSTRAT1850.0[m]DCSTRAT1870.0[m]DCSTRAT1880.0[m]DCSTRAT1900.0[m]DCSTRAT1910.0[m]DCSTRAT1930.0[m]DCSTRAT1960.0[m]DCSTRAT1970.0[m]DCSTRAT1990.0[m]DCSTRAT2000.0[m]DCSTRAT2020.0[m]DCSTRAT2030.0[m]DCSTRAT2050.0[m]DCSTRAT2060.0[m]DCSTRAT2080.0[m]DCSTRAT2090.0[m]DCSTRAT2110.0[m]DCSTRAT2120.0[m]DCSTRAT2140.0[m]DCSTRAT2150.0[m]DCSTRAT2170.0[m]DCSTRAT2180.0[m]DCSTRAT2200.0[m]DCSTRAT2210.0[m]DCSTRAT2230.0[m]DCSTRAT2240.0[m]DCSTRAT2260.0[m]DCSTRAT2270.0[m]DCSTRAT2290.0[m]DCSTRAT2300.0[m]DCSTRAT2310.0[m]DCSTRAT2325.0[m]DCSTRAT2345.0[m]DCSTRAT2370.0[m]DCSTRAT2400.0[m]DCSTRAT2409.0[m]DCHYDRO2417.0[m]DCSTRAT2425.0[m]DCSTRAT2431.5[m]SWCHYDRO2447.0[m]SWCHYDRO2460.0[m]DCSTRAT2475.0[m]DCSTRAT2485.0[m]DCSTRAT2495.0[m]DCSTRAT2505.0[m]DCSTRAT2515.0[m]SWCHYDRO2521.0[m]SWCHYDRO2527.0[m]SWCHYDRO2536.0[m]SWCHYDRO2540.5[m]SWCHYDRO2542.0[m]SWCHYDRO2545.3[m]CHYDRO2545.9[m]CHYDRO2546.5[m]CHYDRO2546.7[m]CHYDRO2548.0[m]SWCHYDRO2548.3[m]CHYDRO2552.1[m]CHYDRO2553.5[m]CHYDRO2556.7[m]CHYDRO2559.9[m]CHYDRO2570.1[m]CHYDRO2570.8[m]CHYDRO2572.8[m]CHYDRO2581.4[m]CHYDRO2588.0[m]SWCHYDRO2591.0[m]SWCHYDRO2597.5[m]SWCHYDRO2608.0[m]SWCHYDRO2622.0[m]DCHYDRO2633.5[m]SWCHYDRO2644.0[m]SWCHYDRO2650.0[m]SWCHYDRO2652.0[m]CHYDRO2655.7[m]CHYDRO2657.7[m]CHYDRO2659.9[m]CHYDRO2670.0[m]SWCHYDRO2677.0[m]SWCHYDRO2680.0[m]DCSTRAT2686.5[m]SWCHYDRO2696.0[m]DCSTRAT2702.0[m]SWCHYDRO2715.0[m]DCSTRAT2727.0[m]SWCHYDRO2747.0[m]DCSTRAT2758.5[m]SWCHYDRO2770.0[m]DCSTRAT2783.5[m]SWCHYDRO2794.0[m]SWCHYDRO2805.0[m]DCSTRAT2815.0[m]DCSTRAT2823.5[m]SWCHYDRO2832.0[m]DCSTRAT2840.0[m]DCSTRAT2850.0[m]DCSTRAT2860.0[m]DCSTRAT2870.0[m]DCSTRAT2880.0[m]DCSTRAT2890.0[m]DCSTRAT2900.0[m]DCSTRAT2910.0[m]DCSTRAT2920.0[m]DCSTRAT2930.0[m]DCSTRAT2940.0[m]DCSTRAT2950.0[m]DCSTRAT2960.0[m]DCSTRAT2970.0[m]DCSTRAT2980.0[m]DCSTRAT2990.0[m]DCSTRAT3002.0[m]DCHYDRO