6406/3-1
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General information
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Wellbore history
GeneralWell 6406/3-1 is located in the southern end of the block, west of the Tyrihans S ør Field on the Mid Norway continental shelf. The primary objective was to test the reservoir potential of the Middle Jurassic sandstones. Secondary objectives were the Early Jurassic sandstones, penetration of the Triassic Grey Beds and Red Beds, and sampling of potential source rocks.Operations and resultsWell 6406/3-1 was spudded with the semi-submersible installation Ross Isle on 27 April 1984 and drilled to TD at 4902 in the Late Triassic Red Beds. The well was drilled with seawater and gel (bentonite/soda) down to 962 m, with gypsum/lignosulphonate mud from 962 m to 3775 m, and with gel/lignosulphonate/lignite mud from 3775 m to TD. At 4498 m a pill of IMCO SPOT/ Pipe Lax was added to free the pipe, which was stuck.A hydrocarbon bearing Middle Jurassic sandstone was encountered at 3782 m, but a drill stem test proved only low concentration of gas in a water phase. The pore pressures in the well were higher than expected and the Middle Jurassic sandstone, which was believed to have a pore pressure equivalent to 1.14 s.g., proved to have a pore pressure equivalent to 1.82 s.g. Post-well geochemical analyses detected migrated hydrocarbons frequently below 1650 metres. These shows were seen chiefly as wet gas/condensate between 2405 - 2585 m and as wet to extremely wet gas at 3665 - 3785 m. Good shows of wet or marginally wet gas were associated with the coals within the Early Jurassic and Trias (Åre Formation). These were suggested in the geochemical report to be in-situ generated and not migrated.Four cores were cut in the well: three from 3783 m to 3847 m in Middle Jurassic Sandstones (Garn Formation) and one from 4539 m to 4549 m in the "Coal Unit" (Åre Formation). An RFT fluid sample was taken at 3784.5 m in the Garn Formation.The well was permanently abandoned on 14 August 1984 as a well with strong gas shows.TestingOne drill stem test was performed from the interval 3782.5 - 3787.5 m. It produced 1469 m3 water and 8763 Sm3 gas/day. Bottom hole temperature in the test was 140 deg C. Gas samples were collected. -
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]360.004901.80 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13783.03794.5[m ]23794.53822.0[m ]33822.03846.3[m ]44537.04548.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]74.3Cores 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 typeCONDUCTOR30352.036354.00.00LOTSURF.COND.20945.026962.01.71LOTINTERM.13 3/82148.017 1/22177.01.85LOTINTERM.9 5/83765.012 1/43784.02.07LOTLINER74470.08 1/24505.02.16LOTOPEN HOLE4902.064902.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03783378815.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.011.00050.00067.000140Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.080006 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR7002147CBL VDL GR20004466CBL VDL GR30003760DLL GR37634494HDT44684899ISF BHC GR MSFL3514902LDL CNL GR3514903NGS34503761NGS37614463NGS44804893RFT GR37843840RFT GR37844085RFT GR37843832SHDT21473771VELOCITY3254902 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit278278145019961996227922792347241031963662366236853782378239013934401240124177438047584864 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf1.01 -
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]PDF30.33pdf3.35pdf33.51pdf3.46pdf4.81pdf0.56pdf13.16pdf7.81pdf0.58pdf1.16pdf1.14pdf1.34pdf0.74pdf8.80 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2921.03WATER BASED07.05.19843471.03WATER BASED07.05.19843531.03WATER BASED10.05.19843541.065.0WATER BASED10.05.19845561.088.0WATER BASED10.05.19847161.084.0WATER BASED10.05.19847541.086.0WATER BASED10.05.19848051.085.0WATER BASED10.05.19849061.103.0WATER BASED10.05.19849301.116.0WATER BASED13.05.19849681.116.0WATER BASED13.05.198410001.128.0WATER BASED13.05.198413501.128.0WATER BASED13.05.198415701.1715.0WATER BASED13.05.198416171.1814.0WATER BASED13.05.198416541.3017.0WATER BASED13.05.198417501.3818.0WATER BASED13.05.198418601.3815.0WATER BASED13.05.198420381.5313.0WATER BASED14.05.198420951.5313.0WATER BASED14.05.198421121.5913.0WATER BASED17.05.198421601.7114.0WATER BASED20.05.198421601.7114.0WATER BASED20.05.198421601.7014.0WATER BASED20.05.198421691.5915.0WATER BASED17.05.198421771.7214.0WATER BASED20.05.198421801.7717.0WATER BASED24.05.198421861.7013.0WATER BASED20.05.198421881.7717.09.6WATER BASED28.05.198423511.8222.08.2WATER BASED28.05.198423991.8524.09.6WATER BASED28.05.198425001.8525.09.0WATER BASED28.05.198428201.8525.08.2WATER BASED31.05.198429321.8524.07.2WATER BASED01.06.198430611.8522.08.0WATER BASED04.06.198437751.8520.07.3WATER BASED18.06.198437751.6015.08.5WATER BASED18.06.198437751.6015.08.5WATER BASED18.06.198437821.4012.05.4WATER BASED20.06.198437841.4025.03.7WATER BASED20.06.198438471.8726.0WATER BASED22.06.198438571.8931.05.8WATER BASED25.06.198438721.8935.07.1WATER BASED25.06.198439301.8934.06.2WATER BASED25.06.198443401.8923.03.0WATER BASED31.07.198444691.8932.07.0WATER BASED12.07.198444981.8633.05.0WATER BASED13.07.198444981.8932.06.0WATER BASED12.07.198444981.8938.07.0WATER BASED12.07.198444981.8932.05.0WATER BASED12.07.198444981.8621.04.0WATER BASED12.07.198444981.8633.04.0WATER BASED12.07.198444981.8633.05.0WATER BASED13.07.198444981.8932.06.0WATER BASED12.07.198444981.8932.05.0WATER BASED12.07.198444981.8621.04.0WATER BASED12.07.198444981.8633.04.0WATER BASED12.07.198445051.7423.04.0WATER BASED16.07.198445211.7424.05.0WATER BASED17.07.198445371.7425.06.0WATER BASED17.07.198445491.7424.06.0WATER BASED17.07.198446011.7424.05.0WATER BASED18.07.198446491.7423.05.0WATER BASED19.07.198446991.7424.06.0WATER BASED20.07.198447631.7423.06.0WATER BASED24.07.198449021.7421.040.0WATER BASED30.07.1984 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2181.0[m]SWCLAP2200.0[m]DCLAP2207.0[m]SWCLAP2215.0[m]DCLAP2230.0[m]DCLAP2245.0[m]DCLAP2260.0[m]DCLAP2275.0[m]DCLAP2290.0[m]DCLAP2305.0[m]DCLAP2306.0[m]SWCLAP2320.0[m]DCLAP2320.0[m]SWCLAP2350.0[m]DCLAP2365.0[m]DCLAP2380.0[m]DCLAP2395.0[m]DCLAP2410.0[m]DCLAP2410.0[m]SWCLAP2425.0[m]DCLAP2440.0[m]DCLAP2440.0[m]SWCLAP2455.0[m]DCLAP2470.0[m]DCLAP2485.0[m]DCLAP2500.0[m]DCLAP2515.0[m]DCLAP2530.0[m]DCLAP2530.0[m]SWCLAP2545.0[m]DCLAP2560.0[m]DCLAP2575.0[m]DCLAP2590.0[m]DCLAP2597.0[m]SWCLAP2605.0[m]DCLAP2620.0[m]DCLAP2635.0[m]DCLAP2650.0[m]DCLAP2650.0[m]DCOD2660.0[m]DCOD2665.0[m]DCLAP2670.0[m]DCOD2680.0[m]DCOD2680.0[m]DCLAP2690.0[m]DCOD2695.0[m]DCLAP2700.0[m]DCOD2710.0[m]DCLAP2710.0[m]DCOD2717.0[m]SWCLAP2720.0[m]DCOD2725.0[m]DCLAP2730.0[m]DCOD2740.0[m]DCOD2740.0[m]DCLAP2750.0[m]DCOD2755.0[m]DCLAP2760.0[m]DCOD2770.0[m]DCLAP2770.0[m]DCOD2780.0[m]DCOD2785.0[m]DCLAP2790.0[m]DCOD2800.0[m]DCOD2800.0[m]DCLAP2810.0[m]DCOD2815.0[m]DCLAP2820.0[m]DCOD2830.0[m]DCOD2830.0[m]DCLAP2840.0[m]DCOD2845.0[m]DCLAP2850.0[m]DCOD2860.0[m]DCOD2860.0[m]DCLAP2870.0[m]DCOD2875.0[m]DCLAP2880.0[m]DCOD2890.0[m]DCOD2890.0[m]DCLAP2900.0[m]DCOD2905.0[m]DCLAP2910.0[m]DCOD2920.0[m]DCOD2920.0[m]DCLAP2932.0[m]DCOD2935.0[m]DCLAP2940.0[m]DCOD2950.0[m]DCOD2950.0[m]DCLAP2960.0[m]DCOD2965.0[m]DCLAP2970.0[m]DCOD2980.0[m]DCOD2980.0[m]DCLAP2990.0[m]DCOD2995.0[m]DCLAP3000.0[m]DCOD3010.0[m]DCOD3010.0[m]DCLAP3020.0[m]DCOD3025.0[m]DCLAP3030.0[m]DCOD3040.0[m]DCOD3040.0[m]DCLAP3050.0[m]DCOD3055.0[m]DCLAP3060.0[m]DCOD3070.0[m]DCOD3070.0[m]DCLAP3080.0[m]DCOD3085.0[m]DCLAP3090.0[m]DCOD3100.0[m]DCOD3100.0[m]DCLAP3110.0[m]DCOD3115.0[m]DCLAP3120.0[m]DCOD3130.0[m]DCOD3130.0[m]DCLAP3140.0[m]DCOD3142.0[m]SWCLAP3145.0[m]DCLAP3150.0[m]DCOD3160.0[m]DCOD3160.0[m]DCLAP3170.0[m]DCOD3175.0[m]DCLAP3180.0[m]DCOD3190.0[m]DCOD3190.0[m]DCLAP3197.0[m]SWCLAP3205.0[m]DCLAP3210.0[m]DCOD3220.0[m]DCOD3220.0[m]DCLAP3230.0[m]DCOD3235.0[m]DCLAP3240.0[m]DCOD3250.0[m]SWCOD3260.0[m]DCOD3262.0[m]DCLAP3265.0[m]DCLAP3270.0[m]DCOD3280.0[m]DCOD3280.0[m]DCLAP3287.0[m]SWCOD3290.0[m]DCOD3295.0[m]DCLAP3300.0[m]DCOD3310.0[m]DCOD3310.0[m]DCLAP3320.0[m]DCOD3325.0[m]DCLAP3330.0[m]DCOD3340.0[m]DCOD3340.0[m]DCLAP3350.0[m]DCOD3355.0[m]DCLAP3360.0[m]DCOD3368.0[m]SWCOD3370.0[m]DCLAP3385.0[m]DCLAP3400.0[m]DCLAP3415.0[m]DCLAP3430.0[m]DCLAP3434.0[m]SWCLAP3445.0[m]DCLAP3460.0[m]DCLAP3464.0[m]SWCOD3475.0[m]DCLAP3490.0[m]DCLAP3505.0[m]DCLAP3520.0[m]DCLAP3535.0[m]DCLAP3550.0[m]DCLAP3565.0[m]DCLAP3580.0[m]DCLAP3588.0[m]SWCOD3595.0[m]DCLAP3604.0[m]SWCOD3608.0[m]SWCLAP3610.0[m]DCLAP3625.0[m]DCLAP3640.0[m]DCLAP3650.0[m]DCSTRATL3655.0[m]DCLAP3657.0[m]SWCOD3659.0[m]SWCOD3660.0[m]DCSTRATL3664.0[m]SWCOD3666.0[m]SWCLAP3667.0[m]SWCOD3668.0[m]SWCLAP3669.0[m]SWCCGG3670.0[m]DCLAP3670.0[m]SWCOD3670.0[m]DCOD3670.0[m]DCSTRATL3673.0[m]SWCLAP3680.0[m]DCOD3680.0[m]DCSTRATL3685.0[m]DCLAP3686.0[m]SWCLAP3690.0[m]DCOD3690.0[m]DCSTRATL3700.0[m]DCSTRATL3700.0[m]DCLAP3700.0[m]DCOD3710.0[m]DCOD3710.0[m]DCSTRATL3715.0[m]SWCLAP3720.0[m]DCOD3720.0[m]DCSTRATL3730.0[m]DCSTRATL3730.0[m]DCOD3730.0[m]DCLAP3740.0[m]DCOD3740.0[m]DCSTRATL3742.0[m]SWCLAP3745.0[m]DCLAP3745.0[m]DCSTRATL3750.0[m]DCSTRATL3750.0[m]DCOD3760.0[m]DCOD3760.0[m]DCLAP3760.0[m]DCSTRATL3770.0[m]DCSTRATL3770.0[m]DCOD3774.0[m]SWCLAP3775.0[m]DCLAP3780.0[m]DCOD3780.0[m]DCSTRATL3783.2[m]CLAP3786.7[m]CSTRATL3790.0[m]DCLAP3790.0[m]DCOD3799.4[m]CLAP3800.0[m]DCOD3816.3[m]CLAP3819.6[m]CLAP3821.2[m]CLAP3822.5[m]COD3823.6[m]CLAP3823.9[m]CLAP3823.9[m]CSTRATL3830.0[m]DCOD3838.6[m]CSTRATL3841.4[m]CSTRATL3842.0[m]CLAP3842.5[m]COD3850.0[m]DCOD3850.0[m]DCLAP3850.0[m]DCSTRATL3857.5[m]DCLAP3860.0[m]DCOD3860.0[m]DCSTRATL3865.0[m]DCLAP3870.0[m]DCOD3870.0[m]DCSTRATL3872.5[m]DCLAP3880.0[m]DCLAP3880.0[m]DCOD3880.0[m]DCSTRATL3887.5[m]DCLAP3890.0[m]DCOD3890.0[m]DCSTRATL3895.0[m]DCLAP3895.2[m]SWCLAP3900.0[m]DCOD3900.0[m]DCSTRATL3910.0[m]DCSTRATL3910.0[m]DCOD3910.0[m]DCLAP3917.5[m]DCLAP3920.0[m]DCOD3920.0[m]DCSTRATL3925.0[m]DCLAP3930.0[m]DCOD3930.0[m]DCSTRATL3932.5[m]DCLAP3940.0[m]DCLAP3940.0[m]DCOD3940.0[m]DCSTRATL3947.5[m]DCSTRATL3947.5[m]DCLAP3950.0[m]DCOD3955.0[m]DCLAP3960.0[m]DCOD3962.5[m]DCLAP3970.0[m]DCLAP3970.0[m]DCOD3977.5[m]DCLAP3980.0[m]DCOD3985.0[m]DCLAP3990.0[m]DCOD3992.5[m]DCLAP4000.0[m]DCLAP4000.0[m]DCOD4007.5[m]DCLAP4010.0[m]DCOD4015.0[m]DCLAP4020.0[m]DCOD4022.7[m]SWCLAP4030.0[m]DCOD4030.0[m]DCLAP4040.0[m]DCOD4045.0[m]DCLAP4050.0[m]DCOD4058.6[m]SWCLAP4060.0[m]DCLAP4060.0[m]DCOD4070.0[m]DCOD4075.0[m]DCLAP4080.0[m]DCOD4090.0[m]DCOD4090.0[m]DCLAP4105.0[m]DCLAP4120.0[m]DCLAP4135.0[m]DCLAP4150.0[m]DCLAP4165.0[m]DCLAP4172.5[m]DCLAP4180.0[m]DCLAP4181.0[m]SWCLAP4187.5[m]DCLAP4195.0[m]DCLAP4202.5[m]DCLAP4210.0[m]DCLAP4225.0[m]DCLAP4225.2[m]SWCLAP4240.0[m]DCLAP4247.5[m]DCLAP4255.0[m]DCLAP4262.5[m]DCLAP4270.0[m]DCLAP4277.5[m]DCLAP4285.0[m]DCLAP4292.5[m]DCLAP4300.0[m]DCLAP4307.5[m]DCLAP4315.0[m]DCLAP4322.5[m]DCLAP4330.0[m]DCLAP4337.5[m]DCLAP4345.0[m]DCLAP4352.0[m]DCLAP4360.0[m]DCLAP4367.5[m]DCLAP4375.0[m]DCLAP4385.2[m]SWCLAP4390.0[m]DCLAP4405.0[m]DCLAP4411.8[m]SWCLAP4420.0[m]DCLAP4435.0[m]DCLAP4450.0[m]DCLAP4465.0[m]DCLAP4480.0[m]DCLAP4495.0[m]DCLAP4510.0[m]DCLAP4525.0[m]DCLAP4537.0[m]CLAP4540.0[m]DCLAP4540.2[m]CLAP4545.0[m]CLAP4547.0[m]CLAP4555.0[m]DCLAP4570.0[m]DCLAP4585.0[m]DCLAP4600.0[m]DCLAP4615.0[m]DCLAP4630.0[m]DCLAP4645.0[m]DCLAP4660.0[m]DCLAP4667.5[m]DCLAP4675.0[m]DCLAP4682.5[m]DCLAP4690.0[m]DCLAP4697.5[m]DCLAP4705.0[m]DCLAP4712.5[m]DCLAP4720.0[m]DCLAP4727.5[m]DCLAP4735.0[m]DCLAP4740.0[m]SWCLAP4750.0[m]DCLAP4759.0[m]SWCLAP4770.5[m]SWCLAP4810.0[m]DCLAP4825.0[m]DCLAP4840.0[m]DCLAP4847.5[m]SWCLAP4855.0[m]DCLAP4870.0[m]DCLAP4885.0[m]DCLAP4901.8[m]DCLAP