6/3-1
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General information
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Wellbore history
GeneralWildcat well 6/3-1 was drilled on the Pi-structure in the northwestern part of the block. The well is situated less than 1 km from the UK-Norwegian median line, where the UK Drake Field, an oil/gas field in UK block 2215was discovered close to the median line. Well 6/3-1 was designed to test possible hydrocarbon accumulations at different levels. The main target was Jurassic and Triassic sandstones. Secondary targets were Paleocene sandstones (Heimdal Formation), and Late Cretaceous porous/fractured chalk.Operations and resultsThe well was spudded with the semi-submersible installation Deepsea Bergen 2 November 1984 and drilled to TD at 3560 m in the Triassic Skagerrak Formation. Drilling of the well proceeded without significant problems, but five and a half rig days were spent waiting on weather. The well was drilled with gel/seawater to 520 m, with gypsum/polymer from 520 m to 2926 m, and with lignite/lignosulphonate from 2926 m to TD.Target reservoir sandstones of Jurassic/Triassic age came in at 2965 m with oil and gas/condensate. A hydrocarbon column of 72 m was proven with oil/water contact at 3037 m. FMT gradients and oil stain on cores indicated a GOC at 3013 m. Secondary target sand (Heimdal Formation) was not found. Logs and shows indicated hydrocarbons in Late Cretaceous chalk/limestone, most strongly from 2900 m to 2925 m, but test of this interval was negative. FMT pressure measurements in the larger interval from 2804 m to 2918.5 m in the chalk were all unsuccessful and showed a tight formation. Eight cores were cut in the well from 2968 m to 3116.5 m. Segregated FMT samples were taken at 3021.5 m (0.87 g/cm3-oil and gas), at 3007.5 m (0.780 g/cm3-condensate, gas, and mud filtrate), at 3016 m (oil, mud filtrate, and gas), at 2992 m (0.77 g/cm3-condensate, mud filtrate, and gas), at 2998.5 m (condensate and gas), and at 2966 m (0.77 g/cm3-condensate, mud filtrate, and gas).The well was permanently abandoned as an oil and gas discovery on 2 January 1985.TestingThree Drill Stem Tests were performed. DST 1 at 3015 m to 3023 m produced 907.5 m3 oil/day and 140 700 Sm3 gas/day on a 64/64" choke and wellhead pressure equal to 51.7 bar. CO2 content in the gas was 2.2 % and H2S content was 1.1 ppm. DST 2 at 2978 m to 2993 m produced 409.4 m3 oil/day and 889 900 Sm3 gas/day on a 72/64" choke and wellhead pressure equal to 95.8 bar. CO2 content in the gas was 2.0 % and H2S content was 2.0 ppm. DST 3 at 2902-2921 m was opened up on a 12/64" choke. It gave no response from the well. Acid was pumped to stimulate flow, but only 2.6 m3 diesel cushion was produced before the well died. Mud with traces of oil was recovered when reversing out the string volume above the circulating valve. -
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]180.003560.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12967.02985.3[m ]22986.02987.7[m ]32988.03006.7[m ]43007.03024.9[m ]53025.03043.0[m ]63043.03061.6[m ]73061.63089.0[m ]83089.03116.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]148.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2410.0[m]DC2445.0[m]DC2475.0[m]DC2507.5[m]SWC2537.5[m]SWC2567.5[m]SWC2602.5[m]SWC2640.0[m]DC2960.0[m]DCSTATOIL2965.0[m]DCSTATOI2969.5[m]C2970.0[m]DCSTATOIL2975.0[m]DCSTATOI2980.0[m]DCSTATOI2980.7[m]C2985.0[m]DCSTATOIL2986.8[m]C2987.5[m]C2988.3[m]C2990.0[m]DCSTATOIL2995.0[m]DCSTATOI2996.4[m]C3000.0[m]DCSTATOIL3004.4[m]C3007.0[m]DCSTATOIL3011.5[m]SWC3012.5[m]SWCSTATOIL3020.0[m]DCSTATOI3022.7[m]C3027.5[m]SWCSTATOIL3028.5[m]SWC3032.5[m]SWCSTATOIL3037.0[m]DCSTATOI3043.5[m]SWC3045.0[m]DCSTATOIL3057.5[m]SWCSTATOI3065.0[m]DCSTATOI3400.0[m]DCSTATOI3410.0[m]DCSTATOI3420.0[m]DCSTATOI3430.0[m]DCSTATOI3450.0[m]DCSTATOI3460.0[m]DCSTATOI3470.0[m]DCSTATOI3480.0[m]DCSTATOI3490.0[m]DCSTATOI3500.0[m]DCSTATOI3510.0[m]DCSTATOI3520.0[m]DCSTATOI3530.0[m]DCSTATOI3540.0[m]DCSTATOI3550.0[m]DCSTATOI3560.0[m]DCSTATOI -
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 availableDSTTEST13023.003015.0008.01.1985 - 00:00YESDSTTEST22993.002978.0015.01.1985 - 22:30YESDSTTEST32921.002902.0021.01.1985 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit109118324352435244925362637267326732679274429222922295029632963296529782978 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.54 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf6.74 -
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]pdf13.18pdf1.98 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03015302319.51.13015302325.42.02978299325.43.0290229210.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.12.036.00012.00035.0003.039.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.07651210000.8601581.19071410000.8601552.04098899000.76821763.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACBL VDL GR1101600ACBL VDL GR10012885ACBL VDL GR27003052CDL CNL GR CAL15992925CDL CNL GR CAL28843558CDL CNL GR CAL SP28853114CDL GR CAL5011627DIFL BHC AC GR SP CAL1103559DIPLOG24403559DLL ML26003115DLWD16323560FMT28042902FMT29663106VELOCITY8303560 -
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 typeCONDUCTOR30170.036175.00.00LOTSURF.COND.20502.026520.01.37LOTINTERM.13 3/81600.017 1/21630.01.79LOTINTERM.9 5/82889.012 1/42926.01.70LOTLINER73560.08 1/23560.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1371.04130.024.0WATER BASED05.11.19841721.0444.016.0WATER BASED05.11.19841751.0648.016.0WATER BASED05.11.19845201.0942.013.0WATER BASED06.11.19845201.1041.013.0WATER BASED07.11.19845201.1041.013.0WATER BASED07.11.19846861.1249.011.5WATER BASED12.11.19849281.1451.011.5WATER BASED12.11.198410501.1451.011.5WATER BASED12.11.198412251.1551.011.5WATER BASED12.11.198414561.1461.012.4WATER BASED13.11.198416301.1562.012.4WATER BASED14.11.198416301.2157.09.0WATER BASED19.11.198416301.2157.09.0WATER BASED19.11.198417001.2061.07.0WATER BASED22.11.198418481.2064.09.0WATER BASED22.11.198421561.1846.07.0WATER BASED23.11.198425551.2048.09.0WATER BASED26.11.198426301.2152.011.0WATER BASED26.11.198426561.2147.011.0WATER BASED27.11.198427571.2046.09.6WATER BASED29.11.198428701.2044.09.0WATER BASED30.11.198429261.3545.07.7WATER BASED03.12.198429681.45WATER BASED11.12.198430211.4554.06.0WATER BASED25.01.198530661.3560.06.0WATER BASED02.01.198531171.4057.06.0WATER BASED17.12.198434541.4054.07.2WATER BASED27.12.198435601.3853.06.2WATER BASED27.12.1984 -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.22