2/8-12 S
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General information
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Wellbore history
GeneralWell 2/8-12 S was drilled on the eastern flank of the Middle and Late Jurassic "Mode" salt feature in a location ca 12 km north of the Valhall Field. The well was planned deviated to avoid the Ekofisk-Emden gas pipeline. The objective of the well was to test the reservoir and possible hydrocarbon potential in the Late and Middle Jurassic sands in the deepest part of the Central Trough, determine the source rock potential and maturation as well as the Jurassic stratigraphy, and determine the Late Cretaceous/Tertiary stratigraphy of the chalk section.Operations and resultsWildcat well 2/8-12 S was spudded with Stena Equipment semi- submersible installation Dyvi Stena on 7 November 1988 and drilled to TD at a total depth of 5300 m in the Triassic Group. The well was drilled with seawater down to 904 m, with seawater/PAC/PHPA from 904 m to 3360 m, with seawater/Low Lime fro 3360 m to 4024 m, and with freshwater/Hoestadrill mud from 4024 m to TD. Shallow gas was encountered in sands around 930 meters. The well was stabilised with heavy mud, and there was no damage or injuries.A major normal fault cuts through the chalk section and caused major problems with lost circulation. Later biostratigraphic analyses showed that most of the Hod Formation was faulted out in the well. The lower Cretaceous section was thicker than expected due to a 241 m of unexpected Early Cretaceous limestone/dolomite (Tuxen Formation). The Late Jurassic shales of the Tyne Group was encountered at 4000 m and proved to be 1191 m thick, which also was thicker than expected. It consisted of the Mandal (42 m), Farsund (165 m) and Haugesund (985 m) Formations. The lithology of the group was generally silty claystone/shale with dolomite/limestone stringers. Organic geochemical analyses of cuttings proved very good source rock potential throughout the whole Group, with the better potential found in the Mandal and Farsund Formations. Top of the oil window is at around 3500 m. Some shows were observed in chalk of the Ekofisk and Tor Formations. One core was cut in the Triassic sands from 5226.5 m to 5244.5 m. The well was permanently abandoned 27 April 1989 as a dry hole with oil/gas 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]940.005300.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15226.55243.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]17.1Cores 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 typeCONDUCTOR30178.036185.00.00LOTINTERM.20904.026935.01.81LOTINTERM.13 3/82286.018 1/22298.01.96LOTINTERM.11 3/43360.012 1/43360.01.98LOTINTERM.9 5/84024.010 5/84025.02.21LOTOPEN HOLE5300.08 1/25300.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT GR22833359BHC GR CAL33623789CST GR28783358CST GR33974020CST GR40355004CST GR41134980CST GR50105302DIL BHC GR47655004DIL BHC GR AMS40284765DIL BHC GR SP37894022DIL BNC GR50055304DIL GR SP33623789FDC CNL GR50055302FMS GR30003359GCT GYRO SURVEY1004009ISF BHC GR MSFL22863357LDL CNL GR CAL22863358LDL CNL GR CAL33624023MWD - GR RES DIR1802297MWD - GR RES DIR32685000RFT GR30673309RFT GR39843988SHDT GR40284600SHDT GR40284600SHDT GR45505004SHDT GR50055300ULSEL40245003VSP6005296 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit941629288328832911294230213046304631183235325732573271375940004000404242075191519152255225 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.65 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.99 -
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]pdf20.59pdf3.67.pdf20.59.pdf3.67 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1101.03WATER BASED26.04.19891101.03WATER BASED27.04.19891101.03WATER BASED27.04.19891851.0618.035.9WATER BASED11.11.19881851.0613.025.4WATER BASED11.11.19883391.0514.033.1WATER BASED15.11.19888351.0618.045.5WATER BASED15.11.19889351.3810.014.4WATER BASED15.11.19889351.3818.08.1WATER BASED16.11.19889351.3812.06.7WATER BASED17.11.19889351.3817.06.7WATER BASED17.11.19889381.3818.06.7WATER BASED21.11.198811551.3820.07.7WATER BASED22.11.198813731.5030.08.6WATER BASED22.11.198818041.5630.07.2WATER BASED22.11.198820641.6031.010.5WATER BASED22.11.198822961.6125.07.2WATER BASED29.11.198822981.6226.09.6WATER BASED29.11.198822981.6222.09.1WATER BASED29.11.198822981.6130.08.6WATER BASED29.11.198826811.6236.09.1WATER BASED29.11.198827481.6221.07.7WATER BASED29.11.198827561.6220.07.7WATER BASED01.12.198829431.6227.08.1WATER BASED01.12.198829921.6235.09.6WATER BASED01.12.198830251.6230.08.6WATER BASED02.12.198831911.6228.07.7WATER BASED06.12.198831911.6228.07.2WATER BASED06.12.198831911.5116.04.8WATER BASED06.12.198831911.5116.05.3WATER BASED07.12.198831911.5116.04.8WATER BASED07.12.198831911.5118.04.3WATER BASED12.12.198831911.5626.07.2WATER BASED13.12.198831911.5322.04.8WATER BASED13.12.198831911.5736.08.6WATER BASED13.12.198831911.5735.08.6WATER BASED14.12.198831911.5632.05.8WATER BASED14.12.198831911.5634.09.1WATER BASED15.12.198831911.5634.09.1WATER BASED16.12.198831911.5835.09.1WATER BASED19.12.198831911.5121.04.8WATER BASED12.12.198831971.5830.06.7WATER BASED19.12.198831971.5822.05.7WATER BASED19.12.198832571.5925.05.7WATER BASED20.12.198832681.6121.05.3WATER BASED21.12.198832681.6123.05.7WATER BASED22.12.198833121.5929.06.7WATER BASED27.12.198833441.5929.06.2WATER BASED27.12.198833441.5930.011.5WATER BASED28.12.198833601.5926.04.8WATER BASED28.12.198833601.5927.04.8WATER BASED29.12.198833601.5928.05.3WATER BASED30.12.198833601.5930.06.7WATER BASED03.01.198933601.5933.07.2WATER BASED03.01.198933601.5930.07.2WATER BASED04.01.198933601.5934.08.1WATER BASED05.01.198933601.5933.06.7WATER BASED06.01.198933601.5927.05.3WATER BASED10.01.198933601.5934.08.2WATER BASED10.01.198933601.5930.05.7WATER BASED10.01.198933601.5931.05.3WATER BASED10.01.198933601.5929.05.3WATER BASED11.01.198933601.5928.04.8WATER BASED12.01.198933601.5927.05.3WATER BASED13.01.198933601.5927.05.3WATER BASED17.01.198933601.7030.05.3WATER BASED24.01.198933601.5925.05.7WATER BASED28.12.198833601.5931.06.7WATER BASED03.01.198933641.6830.05.3WATER BASED18.01.198933671.7139.08.1WATER BASED25.01.198933711.7030.05.7WATER BASED19.01.198934621.7040.06.7WATER BASED24.01.198934621.7040.07.2WATER BASED24.01.198935111.7039.06.5WATER BASED24.01.198935531.7038.07.7WATER BASED24.01.198935821.8640.08.1WATER BASED26.01.198935841.8640.08.1WATER BASED30.01.198936111.8633.05.7WATER BASED30.01.198936451.8632.05.7WATER BASED30.01.198936451.8632.06.2WATER BASED30.01.198936901.8632.04.8WATER BASED31.01.198937001.8632.05.3WATER BASED01.02.198937521.8628.04.8WATER BASED02.02.198937881.9229.05.3WATER BASED03.02.198937881.9528.05.3WATER BASED06.02.198938351.9230.01.4WATER BASED06.02.198938931.9228.05.8WATER BASED08.02.198939621.9227.05.8WATER BASED08.02.198940191.9224.06.2WATER BASED09.02.198940241.9224.03.5WATER BASED01.03.198940251.8922.04.3WATER BASED13.02.198940251.9225.04.8WATER BASED28.02.198940251.9225.05.3WATER BASED10.02.198940251.9220.03.8WATER BASED13.02.198940251.8923.04.8WATER BASED13.02.198940251.9223.04.8WATER BASED14.02.198940251.9224.04.8WATER BASED15.02.198940251.9225.04.3WATER BASED17.02.198940251.9224.05.8WATER BASED17.02.198940251.9224.05.8WATER BASED21.02.198940251.9226.03.8WATER BASED21.02.198940251.9226.04.8WATER BASED22.02.198940251.9226.04.8WATER BASED23.02.198940251.9225.04.3WATER BASED28.02.198940251.9225.04.5WATER BASED28.02.198940251.9223.04.3WATER BASED28.02.198940271.9227.02.9WATER BASED02.03.198940371.9228.02.9WATER BASED03.03.198941131.9231.04.8WATER BASED07.03.198941761.9234.04.8WATER BASED07.03.198942781.9237.05.8WATER BASED07.03.198943471.9835.04.8WATER BASED07.03.198944382.0036.04.8WATER BASED08.03.198945472.0638.05.3WATER BASED10.03.198946102.0939.05.8WATER BASED13.03.198947062.0939.06.7WATER BASED13.03.198947252.0940.06.2WATER BASED13.03.198947442.0933.03.8WATER BASED20.03.198947442.1340.06.2WATER BASED14.03.198947442.1238.05.8WATER BASED15.03.198947442.1338.05.3WATER BASED16.03.198947442.1435.03.8WATER BASED17.03.198947442.1136.03.8WATER BASED20.03.198947632.0940.05.8WATER BASED20.03.198947632.0937.04.3WATER BASED22.03.198947632.0933.03.1WATER BASED28.03.198947632.1036.04.3WATER BASED21.03.198947632.0937.04.3WATER BASED28.03.198947782.0932.03.1WATER BASED28.03.198948472.0935.04.3WATER BASED28.03.198948752.0934.03.4WATER BASED28.03.198949422.0937.03.8WATER BASED29.03.198949472.0937.03.8WATER BASED30.03.198950002.0930.03.8WATER BASED04.04.198950002.0930.03.9WATER BASED04.04.198950002.0930.03.8WATER BASED31.03.198950002.0926.03.8WATER BASED10.04.198950002.0925.02.4WATER BASED10.04.198950002.0924.02.4WATER BASED10.04.198950002.0924.02.4WATER BASED06.04.198950002.0930.02.9WATER BASED05.04.198950002.0923.02.9WATER BASED05.04.198950002.0930.03.8WATER BASED04.04.198950002.0925.03.4WATER BASED07.04.198950002.0925.02.4WATER BASED12.04.198950072.0924.02.4WATER BASED12.04.198950302.0926.01.9WATER BASED13.04.198950952.0926.02.4WATER BASED14.04.198952262.0926.03.4WATER BASED17.04.198952262.0926.03.4WATER BASED17.04.198952262.0926.03.4WATER BASED17.04.198952282.0926.02.4WATER BASED17.04.198952282.0926.02.4WATER BASED17.04.198952282.0926.02.4WATER BASED17.04.198952442.0924.01.9WATER BASED17.04.198952442.0924.01.9WATER BASED17.04.198952442.0924.01.9WATER BASED17.04.198952852.0924.01.4WATER BASED18.04.198953002.0924.01.4WATER BASED19.04.198953002.0922.00.9WATER BASED20.04.198953002.0921.01.4WATER BASED21.04.198953002.0924.01.4WATER BASED26.04.198953002.0926.01.9WATER BASED26.04.198953002.0925.01.4WATER BASED26.04.1989 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory5234.0[m]DCTNO5243.0[m]DCTNO5267.0[m]DCTNO