31/2-19 S
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General information
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Wellbore history
GeneralWell 31/2-19 S is located in the Troll West area some few kilometres to the northwest of the Troll Field. It was drilled to test the hydrocarbon potential of the "S-structure". The primary targets were the Jurassic Sognefjord and Fensfjord Formations, and the Brent Group. Secondary targets were the Paleocene (Lista Formation), the Dunlin Group and the Statfjord Formation.Operations and resultsExploration well 31/2-19 S was spudded with the semi-submersible installation "West Vanguard" on 8 May and drilled to TD at 4114 m (3669 m TVD RKB) in the Early Jurassic Statfjord Formation The well was drilled with seawater and hi-vis bentonite sweeps down to 1316 m and with KCl/PHPA polymer mud from 1316 m to TD.The well encountered 131 m of Intra Lista Formation sandstone, and a 30-40 m sandy interval of poor reservoir quality in the Cretaceous Rødby Formation. Two of the primary prospective levels, the Sognefjord and Fensfjord Formations of the Viking Group were not deposited; instead more than 700 m with the distal Heather formation was penetrated. The Brent Group and Dunlin Group sandstones, and the Statfjord Formation were encountered according to the prognosis. The well was found to be dry (no moveable hydrocarbons) with only weak hydrocarbon shows observed in the Intra Lista Formation sandstone and in sandstones of the Viking and Brent Groups.Five cores were cut, two of them in the Lista Formation, the third in the Rødby Formation, and the last two ones in the Heater Formation. Pressure points were obtained by the HP gauge of the RFT tool. In the Lista Sandstone, a water gradient of 0.99 g/cc was found. In the Cretaceous, no gradient could be defined due to only tight points. In the Brent Group (the Ness and Etive formation equivalents) a water gradient of 1.01 g/cc was found. In the Dunlin Group three good RFT points were achieved. The two deepest ones (in the Amundsen Formation) indicated a water gradient of 0.98 g/cc. No fluid samples were taken. The well was permanently abandoned on 13 July as a dry well with weak 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]1320.004114.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11745.01748.4[m ]21748.41755.6[m ]32515.62517.2[m ]43190.03190.9[m ]53196.03214.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]31.9Cores 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 typeCONDUCTOR30428.536428.50.00LOTINTERM.13 3/81316.017 1/21316.00.00LOTINTERM.9 5/83118.012 1/43118.00.00LOTOPEN HOLE4114.08 1/24114.01.64LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR15602075CST GR20993070CST GR31504070DLL MSFL DSI LDL SNL NGT AMS SP12703100DLL MSFL LDL CNL BHC NGT AMS SP29704111FMS GR AMS30874107FMS MSFL GR AMS13093098MSFL GR AMS26702850MWD - GR RES DIR3664100RFT GR AMS17642496RFT GR AMS18702471RFT GR AMS31783922VSP12903090VSP29804090 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit36784015851585163316941834196519832126212622502466249724972534256025772577273834683632363237494059 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.71 -
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]pdf24.02 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4281.20WATER BASED13161.06WATER BASED15041.2513.0WATER BASED17451.2514.0WATER BASED17481.2520.0WATER BASED21641.2620.0WATER BASED25181.2621.0WATER BASED26201.2521.0WATER BASED29171.2524.0WATER BASED29201.25WATER BASED31181.3024.0WATER BASED31961.3020.0WATER BASED32031.3019.0WATER BASED34531.3018.0WATER BASED41141.3017.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1320.0[m]DCRRI1340.0[m]DCRRI1360.0[m]DCRRI1380.0[m]DCRRI1400.0[m]DCRRI1420.0[m]DCRRI1440.0[m]DCRRI1460.0[m]DCRRI1480.0[m]DCRRI1500.0[m]DCRRI1520.0[m]DCRRI1521.0[m]DCRRI1560.0[m]SWCRRI1580.0[m]DCRRI1600.0[m]DCRRI1610.0[m]DCRRI1620.0[m]DCRRI1625.0[m]SWCRRI1632.0[m]SWCRRI1637.0[m]SWCRRI1650.0[m]DCRRI1660.0[m]DCRRI1678.0[m]SWCRRI1699.0[m]SWCRRI1710.0[m]DCRRI1719.0[m]SWCRRI1730.0[m]DCRRI1740.0[m]DCRRI1750.0[m]DCRRI1761.0[m]SWCRRI1770.0[m]DCRRI1780.0[m]DCRRI1792.0[m]SWCRRI1800.0[m]DCRRI1812.0[m]SWCRRI1830.0[m]SWCRRI1855.0[m]SWCRRI1861.0[m]SWCRRI1967.0[m]SWCRRI1982.0[m]SWCRRI2017.0[m]SWCRRI2035.0[m]SWCRRI2059.0[m]SWCRRI2075.0[m]SWCRRI2099.0[m]SWCRRI2120.0[m]SWCRRI2125.0[m]SWCRRI2130.0[m]SWCRRI2147.0[m]SWCRRI2180.0[m]SWCRRI2230.0[m]SWCRRI2276.0[m]SWCRRI2297.0[m]SWCRRI2300.0[m]DCRRI2315.0[m]SWCRRI2340.0[m]SWCRRI2380.0[m]SWCRRI2400.0[m]DCRRI2416.0[m]SWCRRI2433.0[m]SWCRRI2450.0[m]DCRRI2462.0[m]SWCRRI2472.0[m]SWCRRI2478.0[m]SWCRRI2500.0[m]DCRRI2540.0[m]DCRRI2600.0[m]DCRRI2620.0[m]DCRRI2630.0[m]DCRRI2640.0[m]SWCRRI2650.0[m]DCRRI2658.0[m]SWCRRI2660.0[m]DCRRI2670.0[m]DCRRI2682.0[m]SWCRRI2690.0[m]DCRRI2703.0[m]SWCRRI2710.0[m]SWCRRI2720.0[m]DCRRI2725.0[m]SWCRRI2733.0[m]SWCRRI2740.0[m]SWCRRI2750.0[m]SWCRRI2760.0[m]SWCRRI2772.0[m]SWCRRI2780.0[m]DCRRI2790.0[m]SWCRRI2800.0[m]DCRRI2810.0[m]DCRRI2814.0[m]DCRRI2820.0[m]DCRRI2830.0[m]DCRRI2840.0[m]DCRRI2850.0[m]DCRRI2860.0[m]DCRRI2870.0[m]DCRRI2875.0[m]DCRRI2880.0[m]DCRRI2890.0[m]DCRRI2898.0[m]DCRRI2900.0[m]DCRRI2910.0[m]DCRRI2920.0[m]DCRRI2930.0[m]DCRRI2940.0[m]DCRRI2942.0[m]DCRRI2950.0[m]DCRRI2960.0[m]DCRRI2970.0[m]DCRRI2972.0[m]DCRRI2980.0[m]DCRRI2983.0[m]DCRRI2990.0[m]DCRRI3000.0[m]DCRRI3010.0[m]DCRRI3020.0[m]DCRRI3030.0[m]DCRRI3032.0[m]DCRRI3042.0[m]DCRRI3050.0[m]DCRRI3060.0[m]DCRRI3070.0[m]DCRRI3080.0[m]DCRRI3090.0[m]DCRRI3100.0[m]DCRRI3110.0[m]DCRRI3130.0[m]SWCRRI3140.0[m]DCRRI3150.0[m]SWCRRI3160.0[m]DCRRI3170.0[m]SWCRRI3178.0[m]SWCRRI3218.0[m]SWCRRI3226.0[m]SWCRRI3244.0[m]SWCRRI3256.0[m]SWCRRI3260.0[m]SWCRRI3271.0[m]SWCRRI3280.0[m]DCRRI3304.0[m]SWCRRI3311.0[m]SWCRRI3321.0[m]SWCRRI3330.0[m]DCRRI3339.0[m]SWCRRI3340.0[m]DCRRI3350.0[m]SWCRRI3362.0[m]SWCRRI3379.0[m]SWCRRI3391.0[m]SWCRRI3400.0[m]DCRRI3408.0[m]SWCRRI3421.0[m]SWCRRI3429.0[m]SWCRRI3440.0[m]DCRRI3450.0[m]DCRRI3458.0[m]SWCRRI3470.0[m]DCRRI3478.0[m]SWCRRI3495.0[m]SWCRRI3500.0[m]DCRRI3510.0[m]DCRRI3520.0[m]DCRRI3530.0[m]DCRRI3540.0[m]DCRRI3550.0[m]DCRRI3552.0[m]SWCRRI3562.0[m]SWCRRI3567.0[m]SWCRRI3589.0[m]SWCRRI3600.0[m]DCRRI3610.0[m]DCRRI3621.0[m]SWCRRI3630.0[m]DCRRI3646.0[m]SWCRRI3658.0[m]SWCRRI3670.0[m]DCRRI3683.0[m]SWCRRI3690.0[m]DCRRI3700.0[m]DCRRI3710.0[m]DCRRI3720.0[m]DCRRI3728.0[m]SWCRRI3756.0[m]SWCRRI3770.0[m]DCRRI3786.0[m]SWCRRI3800.0[m]DCRRI3820.0[m]DCRRI3840.0[m]DCRRI3867.0[m]SWCRRI3892.0[m]SWCRRI3900.0[m]DCRRI3920.0[m]DCRRI3939.0[m]SWCRRI3960.0[m]DCRRI3980.0[m]DCRRI3990.0[m]SWCRRI4000.0[m]DCRRI4020.0[m]DCRRI4040.0[m]DCRRI4060.0[m]DCRRI4075.0[m]SWCRRI4100.0[m]DCRRI4114.0[m]DCRRI