6406/3-2
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General information
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Wellbore history
GeneralWell 6406/3-2 is located in the middle of the block, west of the Tyrihans North field off shore Mid Norway. The primary objective of the well was to find hydrocarbon accumulations of significant size in the Middle Jurassic. Secondary objectives were hydrocarbon accumulations in the Early Jurassic sandstone. The well should also verify the geophysical and structural interpretation and improve the geological, paleontological and geochemical understanding of the area. Total depth was to be in rocks of Triassic age or 4000 m in order to satisfy the licence commitment.Operations and resultsWell 6406/3-2 was spudded with the semi-submersible installation West Vanguard on 28 June 1986 and drilled to TD at 4523 m in the Early Jurassic Åre Formation. The well was drilled practically vertical down to the deepest survey point at 4261 m (4260 m TVD). In the testing phase 543.5 hrs were spent on fishing to get the cement stinger loose. The well was drilled with spud mud down to 965 m, with gypsum/polymer mud from 965 m to 2301 m, with gypsum lignosulphonate mud from 2301 m to 3930 m, and with lignosulphonate mud from 3930 m to TD.The Middle Jurassic sandstones (Garn Formation) were penetrated at 3930 m and were found to be HC-bearing. The oil contact, probably and oil-down-to contact, was found from geochemical methods at approximately 4030 m. The logs indicated that the oil/water contact was at 4335 m. Oil shows were recorded in several intervals below this depth throughout down to TD. RFT data indicated that both Ile and Ti1je Formations were impermeable.A total of 285 m core was recovered in 17 cores from the Garn, Not, Ile, Ror, and Tilje formations. No fluid samples were taken on wire line.The well was permanently abandoned on 22 November 1986 as an oil discovery.TestingTwo drill stem tests were performed in the well. DST 1 tested the interval 4302 - 4336 m in the Tilje Formation. It produced only 4.5 m3 water into the test string. Maximum temperature recorded was 145.8 deg C.DST 2 tested the interval 3937 - 3995 m in the Garn Formation. The test produced at maximum rate on open choke manifold 645 sm3 oil and 130000 sm3 gas /day. The GOR was 202 Sm3/Sm3, the oil density was 0.828 g/cm3, and the gas gravity was 0.855 (air = 1). Maximum temperature recorded in the corresponding flow period was 145 deg C. -
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]436.004512.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13931.03933.9[m ]23935.03952.0[m ]33952.03964.3[m ]43965.03981.5[m ]53983.04001.3[m ]64001.04027.0[m ]74027.54047.0[m ]84048.04056.6[m ]94067.04094.0[m ]104094.04119.8[m ]114121.04148.3[m ]124282.04296.0[m ]134298.54308.0[m ]144308.54335.0[m ]154336.04340.9[m ]164345.54361.0[m ]174363.04376.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]284.6Cores 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 availableDSTTEST23937.003995.0009.11.1986 - 12:30YES -
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 typeCONDUCTOR30433.036436.00.00LOTSURF.COND.20951.026965.01.60LOTINTERM.13 3/82283.017 1/22301.01.85LOTINTERM.9 5/83913.012 1/43930.01.93LOTLINER74377.08 1/24380.02.07LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04302433612.72.03937399511.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.038.0001462.02.00024.000145Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.06451290000.825200 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]00CBL CDL GR3202282CBL VDL GR37684381CBL VDL GR39804711CST GR32333865CST GR43854518DLL GR39134378ISF MSFL LSS GR3154524LDL CNL GR39134526MWD - DLWD3224282RFT GR39423950RFT GR39424371SHDT GR39134382TEMP3403875 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit322149319701970230923092380243731193841384138673930393040174069412841284178420342854496 -
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]pdf2.40pdf9.74pdf9.66pdf2.98 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4361.1060.0WATERBASED30.06.19866771.1257.023.8WATERBASED01.07.19869651.1241.025.9WATERBASED02.07.19869650.0040.025.2WATERBASED04.07.19869650.0041.024.5WATERBASED06.07.19869651.1244.019.1WATER BASED06.07.19869651.2342.04.3WATER BASED06.07.198610301.1257.012.0WATER BASED10.07.198613801.1453.08.6WATER BASED13.07.198615711.2058.07.7WATER BASED13.07.198619721.2165.012.6WATERBASED13.07.198622161.5080.020.3WATERBASED14.07.198622981.5575.017.5WATERBASED15.07.198622980.0072.016.8WATERBASED16.07.198622980.0061.014.0WATERBASED17.07.198622980.0071.012.6WATERBASED20.07.198622980.0072.013.3WATERBASED20.07.198622980.0060.012.6WATERBASED20.07.198623011.6161.014.0WATERBASED21.07.198623010.0059.011.9WATERBASED22.07.198623791.6151.011.2WATERBASED23.07.198624981.8072.012.6WATERBASED24.07.198625811.8082.017.5WATERBASED28.07.198627411.8065.016.1WATERBASED28.07.198628271.8055.014.0WATERBASED28.07.198629111.8060.014.0WATERBASED28.07.198629371.8056.014.0WATERBASED30.07.198629741.8052.014.7WATERBASED31.07.198629941.8047.09.1WATERBASED01.08.198630451.8054.011.2WATERBASED04.08.198631061.8052.09.8WATERBASED04.08.198631631.8055.011.2WATERBASED04.08.198632231.8054.09.8WATERBASED05.08.198632871.8055.010.5WATERBASED06.08.198633441.8057.010.5WATERBASED07.08.198634021.8053.010.5WATERBASED08.08.198634531.8051.010.5WATERBASED11.08.198635111.8051.011.2WATERBASED11.08.198635271.8051.010.5WATERBASED11.08.198635541.8053.011.2WATERBASED12.08.198636221.8051.010.5WATERBASED13.08.198636961.8048.011.2WATERBASED14.08.198637071.8048.012.0WATERBASED18.08.198637801.8047.012.0WATERBASED18.08.198638401.8048.011.0WATERBASED18.08.198638501.8050.013.3WATERBASED18.08.198638721.8048.011.2WATERBASED19.08.198639041.8047.013.3WATERBASED20.08.198639131.2653.07.0WATERBASED01.09.198639301.8049.013.3WATERBASED21.08.198639300.0052.014.0WATERBASED22.08.198639300.0058.013.3WATERBASED25.08.198639300.0052.013.3WATERBASED25.08.198639300.0052.014.0WATERBASED25.08.198639311.3644.05.6WATERBASED27.08.198639351.3740.06.3WATERBASED28.08.198639471.3650.06.3WATERBASED29.08.198639651.3550.07.0WATERBASED01.09.198639831.2556.07.0WATERBASED01.09.198640011.2357.07.0WATERBASED02.09.198640311.2356.06.3WATERBASED04.09.198640481.2360.07.0WATERBASED04.09.198640601.2358.07.0WATERBASED05.09.198640941.2358.07.0WATERBASED08.09.198641611.2655.07.7WATER BASED14.10.198641611.2660.08.4WATER BASED16.10.198641611.2760.09.1WATER BASED24.10.198641611.2660.08.4WATER BASED15.10.198641611.2656.07.7WATER BASED17.10.198641611.2655.07.0WATER BASED20.10.198641611.2660.010.5WATER BASED20.10.198641611.2655.09.1WATER BASED20.10.198641611.2660.010.5WATER BASED21.10.198641611.2663.010.5WATER BASED23.10.198641610.0060.09.1WATERBASED27.10.198641610.0060.09.3WATERBASED27.10.198641611.2660.09.3WATER BASED27.10.198641611.2660.09.1WATER BASED28.10.198641611.2660.09.1WATER BASED29.10.198641611.2660.010.5WATER BASED30.10.198641611.2660.09.8WATER BASED31.10.198641611.2663.09.8WATER BASED17.11.198641641.2355.07.0WATERBASED08.09.198641681.2362.07.0WATERBASED09.09.198642121.2356.06.3WATERBASED10.09.198642821.2362.08.4WATERBASED11.09.198642991.2358.07.7WATERBASED12.09.198643001.3858.05.6WATERBASED06.10.198643271.2359.06.3WATERBASED15.09.198643431.2660.07.0WATERBASED18.09.198643471.2362.07.7WATER BASED15.09.198643531.3864.07.7WATERBASED06.10.198643531.2664.08.4WATER BASED07.10.198643531.2662.07.7WATER BASED09.10.198643531.2660.07.0WATER BASED10.10.198643531.2655.07.0WATER BASED13.10.198643531.2655.07.7WATER BASED13.10.198643771.2655.06.3WATERBASED23.09.198643780.0061.07.0WATERBASED16.09.198643780.0060.07.0WATERBASED17.09.198643780.0062.07.7WATERBASED19.09.198643781.2362.07.7WATERBASED15.09.198643800.0053.06.3WATERBASED22.09.198643801.2655.06.3WATERBASED22.09.198643800.0058.06.3WATERBASED22.09.198643800.0068.08.4WATERBASED24.09.198644001.3557.06.3WATERBASED25.09.198644201.6263.07.0WATERBASED26.09.198644291.6255.06.3WATERBASED29.09.198645131.6259.07.0WATERBASED29.09.198645231.6260.05.6WATERBASED29.09.198645230.0060.05.6WATERBASED30.09.198645230.0062.05.6WATERBASED01.10.198645230.0053.04.9WATERBASED02.10.198645230.0060.04.9WATERBASED03.10.198645230.0060.04.9WATERBASED06.10.198645230.0060.05.7WATERBASED06.10.1986 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2415.0[m]DCOD2439.0[m]DCOD2463.0[m]DCOD2499.0[m]DCOD2523.0[m]DCOD2550.0[m]DCOD2574.0[m]DCOD2598.0[m]DCOD2628.0[m]DCOD2652.0[m]DCOD2676.0[m]DCOD2700.0[m]DCOD2724.0[m]DCOD2751.0[m]DCOD2775.0[m]DCOD2802.0[m]DCOD2826.0[m]DCOD2850.0[m]DCOD2874.0[m]DCOD2901.0[m]DCOD2925.0[m]DCOD2952.0[m]DCOD2973.0[m]DCOD3000.0[m]DCOD3024.0[m]DCOD3051.0[m]DCOD3078.0[m]DCOD3102.0[m]DCOD3126.0[m]DCOD3153.0[m]DCOD3174.0[m]DCOD3201.0[m]DCOD3225.0[m]DCOD3233.0[m]SWCR.R.I3274.5[m]SWCR.R.I3275.0[m]DCOD3284.5[m]SWCR.R.I3300.0[m]DCOD3306.5[m]SWCRRI3327.0[m]DCOD3350.0[m]DCOD3361.5[m]SWCRRI3384.0[m]DCOD3400.2[m]SWCRRI3402.0[m]DCOD3421.0[m]SWCRRI3426.0[m]DCOD3450.0[m]DCOD3474.0[m]DCOD3501.0[m]DCOD3528.0[m]DCOD3549.0[m]DCOD3573.0[m]DCOD3600.0[m]DCOD3624.0[m]DCOD3651.0[m]DCOD3675.0[m]DCOD3699.0[m]DCOD3726.0[m]DCOD3750.0[m]DCOD3774.0[m]DCOD3798.0[m]DCOD3803.5[m]SWCRRI3825.0[m]DCOD3825.8[m]SWCRRI3849.0[m]DCOD3857.5[m]SWCRRI3876.0[m]DCOD3900.0[m]DCOD3900.0[m]DCRRI3906.0[m]DCRRI3912.0[m]DCRRI3918.0[m]DCRRI3924.0[m]DCRRI3927.0[m]DCOD3930.0[m]DCOD3930.0[m]DCRRI3931.0[m]CRRI3940.0[m]CRRI3946.0[m]CRRI3957.0[m]CRRI3962.0[m]CRRI3968.0[m]CRRI3970.0[m]CRRI3976.0[m]CRRI3980.0[m]CRRI3983.0[m]CRRI3988.0[m]CRRI3994.0[m]CRRI4000.0[m]CRRI4008.0[m]CRRI4012.0[m]CRRI4017.0[m]CRRI4019.0[m]CRRI4022.0[m]CRRI4027.0[m]CRRI4033.0[m]CRRI4039.0[m]CRRI4044.0[m]CRRI4050.0[m]CRRI4056.0[m]CRRI4067.0[m]CRRI4068.0[m]CRRI4073.0[m]CRRI4076.0[m]CRRI4092.0[m]CRRI4098.0[m]CRRI4124.0[m]CRRI4135.0[m]CRRI4145.0[m]CRRI4153.0[m]DCOD4283.0[m]CRRI4292.0[m]DCRRI4298.0[m]CRRI4305.0[m]CRRI4321.0[m]CRRI4334.0[m]CRRI4348.0[m]CRRI4360.0[m]CRRI4367.0[ft]CRRI