35/3-5
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General information
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Wellbore history
GeneralWell 35/3-5 is located ca 13 km south of the Agat Discovery. The primary target of the well was sandstones of Early Cretaceous age, which had been found hydrocarbon bearing in the 35/3-2 and 35/3-4 wells. The well was considered a wildcat due to the uncertain correlation between sand bodies in the area. The secondary objective was to penetrate sandstones of Middle - Early Jurassic age, which had been found hydrocarbon bearing in 35/3-2.The well is Reference well for the Agat Formation.Operations and resultsExploration well 35/3-5 was spudded with the semi-submersible installation West Venture on 22 December 1981 and drilled to TD at 4114 m in Basement rocks. The well was respudded two times due to boulders. Shallow gas caused problems with cementing and caused a leak outside of the casing. The leak was repaired and further operations were performed without any specific problems. The well was drilled with seawater and hi-vis pills down to 420 m, with seawater/gel mud from 420 m to 1046 m, with gypsum/polymer mud from 1046 m to 2052 m, and with lignosulphonate mud from 2052 m to TD.The Agat Formation was encountered from 3219 m to 3620 m. A thin Intra Heather sandstone was penetrated from 3865 m to 3874 m. A minor show was noted at the top of the Agat Formation. Minor oil shows with associated formation gas peaks were recorded in sandstones at 3547 m and 3568 m. Minor shows were recorded in siltstones below 3685 m, but these were not associated with gas peaks. Organic geochemical analyses confirmed migrant hydrocarbons at 3223 m in the top of the Agat Formation. Source rocks were immature down to about 3000 m. Oil window maturity is postulated below ca 3900 m. Below ca 3300 m in the well total organic carbon was found in the range 1.7 % to 3 % in picked mud stone samples. Shale in a thin interval at 3286 m to 3295 m was evaluated as a good/rich potential as a source rock for gas and oil while claystone/siltstone from 3847 m to 4063 had fair/good potential as a source rock for gas and some paraffinic oil. Four cores were cut in the interval 3227.6 m to 3292.1 m in the Agat Formation (log depth ca 4 m deeper for all cores). A fifth core was attempted in the Heather Formation, but this core had no recovery. An RFT fluid sample at 3243 m recovered only water and mud filtrate.The well was plugged and abandoned as a dry hole 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]430.004111.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13227.73245.2[m ]23245.23257.6[m ]33257.13274.6[m ]43274.73292.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]64.9Cores 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 typeCONDUCTOR30410.036420.00.00LOTSURF.COND.201032.0261046.01.48LOTINTERM.13 3/82041.017 1/22052.01.66LOTINTERM.9 5/83406.012 1/43413.01.73LOTOPEN HOLE4114.08 1/24114.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR2921032CBL VDL GR2922041CBL VDL GR16803225CST24663410CST34294110FDC CNL GR10323719HDT34064113ISF BHC GR10322052ISF BHC GR CAL4101043ISF BHC MSFL GR20404112LDL CNL GR37004113NGS37004100RFT32233397RFT34823598SHDT20403412VELOCITY4754110 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit295593593975975102611001121114511721400142014201500256929042912318131813219351036393732373238653874395539553999405240604092 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.73 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf3.64 -
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]pdf3.15pdf0.88pdf2.08 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3080.00seawater8171.1142.0water based17711.1540.0water based20521.9358.0water based25251.1746.0water based30501.2244.0water based32451.2554.0water based40391.2950.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory600.0[m]DCGEOCH630.0[m]DCGEOCH660.0[m]DCGEOCH690.0[m]DCGEOCH720.0[m]DCGEOCH750.0[m]DCGEOCH780.0[m]DCGEOCH870.0[m]DCGEOCH920.0[m]DCGEOCH940.0[m]DCGEOCH970.0[m]DCGEOCH980.0[m]DCGEOCH1000.0[m]DCROBERTSO1010.0[m]DCROBETRSO1010.0[m]DCGEOCH1020.0[m]DCGEOCH1020.0[m]DCROBERTSO1030.0[m]DCROBERTSO1040.0[m]DCROBERTSO1050.0[m]DCROBERTSO1060.0[m]DCROBERTSO1060.0[m]DCGEOCH1070.0[m]DCROBERTSO1080.0[m]DCROBERTSO1090.0[m]DCROBERTSO1090.0[m]DCGEOCH1100.0[m]DCROBERTSO1110.0[m]DCROBERTSO1120.0[m]DCROBERTSO1120.0[m]DCGEOCH1130.0[m]DCROBERTSO1140.0[m]DCROBERTSO1150.0[m]DCGEOCH1180.0[m]DCROBERTSO1190.0[m]DCROBERTSO1200.0[m]DCROBERTSO1210.0[m]DCROBERTSO1220.0[m]DCROBERTSO1230.0[m]DCROBERTSO1230.0[m]DCGEOCH1240.0[m]DCROBERTSO1250.0[m]DCROBERTSO1260.0[m]DCROBERTSO1270.0[m]DCROBERTSO1270.0[m]DCGEOCH1280.0[m]DCROBERTSO1290.0[m]DCROBERTSO1290.0[m]DCGEOCH1300.0[m]DCROBERTSO1310.0[m]DCROBERTSO1320.0[m]DCROBERTSO1330.0[m]DCROBERTSO1340.0[m]DCROBERTSO1350.0[m]DCROBERTSO1360.0[m]DCROBERTSO1370.0[m]DCROBERTSO1380.0[m]DCROBERTSO1380.0[m]DCGEOCH1390.0[m]DCROBERTSO1400.0[m]DCROBERTSO1410.0[m]DCGEOCH1420.0[m]DCRRI1430.0[m]DCGEOCH1440.0[m]DCRRI1460.0[m]DCRRI1480.0[m]DCRRI1500.0[m]DCRRI1520.0[m]DCRRI1540.0[m]DCRRI1560.0[m]DCRRI1580.0[m]DCRRI1600.0[m]DCRRI1620.0[m]DCRRI1640.0[m]DCRRI1660.0[m]DCRRI1680.0[m]DCRRI1700.0[m]DCRRI1720.0[m]DCRRI1740.0[m]DCRRI1760.0[m]DCRRI1780.0[m]DCRRI1800.0[m]DCRRI1820.0[m]DCRRI1840.0[m]DCRRI1860.0[m]DCRRI1880.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCROBERT1940.0[m]DCRRI1960.0[m]DCRRI1980.0[m]DCRRI2000.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2060.0[m]DCRRI2080.0[m]DCRRI2100.0[m]DCRRI2120.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2180.0[m]DCRRI2200.0[m]DCRRI2220.0[m]DCRRI2240.0[m]DCRRI2260.0[m]DCRRI2280.0[m]DCRRI2300.0[m]DCRRI2320.0[m]DCRRI2335.0[m]DCRRI2340.0[m]DCRRI2350.0[m]DCRRI2360.0[m]DCRRI2365.0[m]DCRRI2380.0[m]DCRRI2395.0[m]DCRRI2400.0[m]DCRRI2410.0[m]DCRRI2415.0[m]DCRRI2425.0[m]DCRRI2430.0[m]DCRRI2440.0[m]DCRRI2460.0[m]DCRRI2480.0[m]DCRRI2500.0[m]DCRRI2520.0[m]DCRRI2535.0[m]DCRRI2560.0[m]DCRRI2580.0[m]DCRRI2600.0[m]DCRRI2620.0[m]DCRRI2640.0[m]DCRRI2660.0[m]DCRRI2680.0[m]DCRRI2700.0[m]DCRRI2720.0[m]DCRRI2740.0[m]DCRRI2760.0[m]DCRRI2780.0[m]DCRRI2800.0[m]DCRRI2818.0[m]DCRRI2833.0[m]DCRRI2878.0[m]DCRRI2893.0[m]DCRRI2908.0[m]DCRRI2928.0[m]DCRRI2938.0[m]DCRRI2953.0[m]DCRRI2968.0[m]DCRRI2983.0[m]DCRRI2998.0[m]DCRRI3013.0[m]DCRRI3028.0[m]DCRRI3043.0[m]DCRRI3058.0[m]DCRRI3073.0[m]DCRRI3088.0[m]DCRRI3103.0[m]DCRRI3118.0[m]DCRRI3130.0[m]DCRRI3133.0[m]DCRRI3148.0[m]DCRRI3160.0[m]DCRRI3190.0[m]DCRRI3215.0[m]SWCOD3220.0[m]DCRRI3224.0[m]SWCRRI3227.5[m]COD3229.1[m]COD3229.1[m]CRRI3229.2[m]COD3229.2[m]COD3231.6[m]COD3233.2[m]COD3233.3[m]CRRI3233.9[m]COD3235.0[m]DCRRI3236.3[m]COD3236.3[m]COD3236.5[m]CRRI3236.6[m]COD3239.2[m]COD3240.7[m]COD3241.8[m]COD3241.9[m]COD3243.5[m]COD3249.1[m]COD3249.5[m]CRRI3250.0[m]DCRRI3250.4[m]COD3250.4[m]COD3252.0[m]COD3253.9[m]COD3254.9[m]COD3254.9[m]COD3255.7[m]COD3257.1[m]COD3257.2[m]COD3257.2[m]CRRI3257.6[m]COD3258.9[m]COD3259.7[m]COD3260.0[m]COD3260.1[m]CRRI3260.5[m]COD3260.8[m]COD3261.9[m]COD3262.5[m]COD3264.0[m]COD3264.5[m]COD3265.0[m]DCSTATOIL3265.7[m]COD3266.9[m]COD3266.9[m]COD3266.9[m]CRRI3267.5[m]COD3269.0[m]COD3269.0[m]COD3270.2[m]CRRI3270.5[m]COD3270.5[m]COD3271.7[m]COD3271.7[m]COD3272.8[m]COD3273.8[m]COD3273.9[m]COD3274.4[m]COD3274.5[m]CRRI3275.3[m]COD3275.4[m]COD3275.9[m]CRRI3276.3[m]COD3276.7[m]COD3277.0[m]CRRI3277.1[m]COD3277.1[m]COD3278.2[m]COD3278.3[m]COD3278.3[m]COD3280.0[m]DCRRI3280.0[m]CRRI3280.2[m]COD3281.7[m]COD3283.4[m]COD3284.9[m]COD3285.0[m]CRRI3285.0[m]COD3285.7[m]COD3285.8[m]COD3287.5[m]COD3287.6[m]COD3288.1[m]CRRI3288.3[m]CRRI3288.5[m]COD3288.5[m]COD3288.7[m]COD3290.5[m]COD3291.9[m]CRRI3292.0[m]COD3292.1[m]CRRI3294.0[m]SWCRRI3295.0[m]DCRRI3310.0[m]DCRRI3319.0[m]SWCRRI3330.0[m]SWCRRI3330.0[m]CRRI3331.0[m]DCRRI3340.0[m]DCRRI3346.0[m]DCRRI3361.0[m]DCRRI3363.0[m]SWCRRI3368.0[m]SWCRRI3370.0[m]DCRRI3376.0[m]DCRRI3381.0[m]SWCRRI3391.0[m]DCRRI3400.0[m]DCRRI3406.0[m]DCRRI3421.0[m]DCRRI3430.0[m]DCRRI3432.5[m]SWCRRI3436.0[m]DCRRI3447.5[m]SWCRRI3451.0[m]DCRRI3457.5[m]SWCRRI3460.0[m]DCRRI3466.0[m]DCRRI3481.0[m]DCRRI3490.0[m]DCRRI3496.0[m]DCRRI3500.5[m]SWCRRI3511.0[m]DCRRI3517.0[m]SWCRRI3520.0[m]DCRRI3526.0[m]DCRRI3533.0[m]SWCRRI3541.0[m]DCRRI3550.0[m]DCRRI3559.0[m]DCRRI3574.0[m]DCRRI3577.0[m]SWCRRI3580.0[m]DCRRI3589.0[m]DCRRI3604.0[m]DCRRI3610.0[m]DCRRI3612.0[m]SWCRRI3619.0[m]DCRRI3620.5[m]SWCRRI3634.0[m]DCRRI3637.5[m]SWCOD3640.0[m]DCRRI3649.0[m]DCRRI3654.5[m]SWCRRI3659.5[m]SWCOD3664.0[m]DCRRI3670.0[m]DCRRI3670.5[m]SWCRRI3672.5[m]SWCOD3679.0[m]DCOD3697.0[m]SWCRRI3697.0[m]SWCOD3701.5[m]SWCRRI3706.5[m]SWCOD3706.5[m]SWCOD3713.0[m]SWCRRI3730.5[m]SWCRRI3751.0[m]DCOD3754.5[m]SWCRRI3754.5[m]SWCOD3760.0[m]DCOD3760.0[m]SWCOD3769.0[m]DCOD3777.0[m]SWCRRI3781.0[m]DCOD3790.0[m]DCOD3793.5[m]SWCRRI3799.0[m]DCOD3802.0[m]SWCRRI3809.0[m]SWCOD3809.5[m]SWCOD3809.5[m]SWCRRI3811.0[m]DCOD3821.5[m]SWCRRI3828.5[m]SWCRRI3849.5[m]SWCRRI3854.5[m]SWCOD3861.5[m]SWCRRI3885.0[m]SWCRRI3885.0[m]SWCOD3900.0[m]SWCRRI3912.0[m]SWCOD3930.0[m]SWCRRI3956.0[m]SWCRRI3956.0[m]SWCOD3956.0[m]SWCOD3975.0[m]SWCRRI3995.0[m]SWCOD4008.5[m]SWCRRI4053.5[m]SWCRRI 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Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3229.05[m ]3229.20[m ]3231.60[m ]3233.15[m ]3233.90[m ]3236.25[m ]3237.60[m ]3240.65[m ]3241.80[m ]3241.88[m ]3243.50[m ]3244.95[m ]3245.88[m ]3248.05[m ]3249.10[m ]3250.35[m ]3251.95[m ]3253.85[m ]3254.85[m ]3254.90[m ]3255.70[m ]3257.10[m ]3239.20[m ]3258.88[m ]3259.68[m ]3260.03[m ]3260.50[m ]3260.75[m ]3261.90[m ]3262.45[m ]3264.00[m ]3264.50[m ]3265.70[m ]3266.85[m ]3266.90[m ]3267.50[m ]3268.95[m ]3269.00[m ]3270.45[m ]3270.50[m ]3271.68[m ]3271.73[m ]3272.80[m ]3273.80[m ]3273.90[m ]3274.35[m ]3275.30[m ]3275.35[m ]3276.30[m ]3276.73[m ]3277.07[m ]3277.10[m ]3278.16[m ]3278.26[m ]3278.33[m ]3280.15[m ]3281.65[m ]3283.40[m ]3284.93[m ]3285.72[m ]3287.45[m ]3287.57[m ]3288.70[m ]3290.50[m ]3292.00[m ]3227.75[m ]