15/8-1
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General information
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Wellbore history
GeneralWildcat well 15/8-1 was drilled west of the Sleipner field, ca 2 km from the UK border. The well was designed to test possible hydrocarbon accumulation in the sandstones of middle Jurassic age.Operations and resultsWildcat well 15/8-1 was spudded with the semi-submersible installation Glomar Biscay II on 18 July 1981 and drilled to TD at 4300 m in the Middle Jurassic Fladen Group. Drilling operations were performed without significant problems in the 36", 26" and 17 1/2" holes. Pipe stuck in the 12 1/4" hole at 2254 m and several times in the 8 1/2" hole. Miscellaneous technical problems occurred while drilling the 6" hole and a gas kick was at 4265 m while tripping. The well was drilled with seawater and gel down to 500 m and with gypsum mud from 500 m to 2890 m. Lignosulphonate was added from 1570 m, and from 2890 m to TD the gypsum mud was gradually depleted and replaced with a gel/lignosulphonate mud.The well 15/8-1 proved gas and condensate in sandstone of Middle Jurassic age. The gas/water contact was indicated at 3698 m from the Formation Multi Tester. Oil shows were recorded from 3065 m to 3075 m in the Hod Formation. Five conventional cores were cut in the interval 3658 m to 3705.5 m in the Hugin Formation. Three samples were attempted taken during FMT runs. Due to technical malfunctions only 1 sample (from 3668 m) was obtained.The well was permanently abandoned on 7 January 1982 as a gas/condensate discovery.TestingOne drill stem test was performed in the Sleipner formation and three in the Hugin Formation. The procedure of the tests was similar; after initial flow and build up the well was flowed for approximately 660 min. producing gas/condensate. Test no. 4 was only flowed for 480 minutes. CO2 was produced in all tests, in concentrations ranging from 4% to 15%, and up to 8 ppm H2S was recorded in DST2. Two sets of PVT samples were taken at the separator during all 4 tests.DST1 from 4079 m to 4094 m in the Sleipner Formation produced 427000 Sm3 gas and 316 Sm3 condensate/day on a 19.1 mm choke. The gas/condensate ratio (CGR) was 1351 m3/m3. DST2 from 3911 m to 3926 m produced 486000 Sm3 gas and 399 Sm3 condensate/day on a 16.7 mm choke, the CGR was 1218 m3/m3. DST3 from 3688 m to 3697 m produced 657000 Sm3 gas and 408 Sm3 condensate/day on a 22.2 mm choke. The CGR was 1610 m3/m3. DST4 from 3643 m to 3653 m produced 550000 Sm3 gas and 290 Sm3 condensate/day on a 22.2 mm choke. The CGR was 1897 m3/m3. -
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]200.004298.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13658.03667.5[m ]23667.53678.6[m ]33678.83680.6[m ]43681.93699.0[m ]53699.03706.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]46.7Cores 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 typeLaboratory3500.0[m]DC3530.0[m]DC3539.0[m]DC3560.0[m]DC3566.0[m]DC3575.0[m]DC3590.0[m]DC3596.0[m]C3605.0[m]C3620.0[m]DC3629.0[m]C3629.0[m]DCOD3638.0[m]DC3641.0[m]DC3641.0[m]DCOD3650.0[m]DCOD3650.0[m]DC3658.2[m]COD3663.6[m]C3671.0[m]COD3676.0[m]C3676.3[m]COD3677.0[m]DC3680.0[m]DC3680.5[m]DCOD3682.2[m]DCOD3683.4[m]DC3685.5[m]DCOD3686.0[m]C3688.1[m]COD3688.8[m]C3690.2[m]COD3698.5[m]COD3700.4[m]C3710.0[m]DC3713.0[m]DC3719.0[m]DCOD3740.0[m]DCOD3740.0[m]DC3761.0[m]DCOD3770.0[m]DC3773.0[m]DC3779.0[m]DCOD3800.0[m]DCOD3800.0[m]DC3809.0[m]DCOD3815.0[m]C3821.0[m]DCOD3821.0[m]DCOD3830.0[m]DC3833.0[m]DC3839.0[m]DCOD3860.0[m]DCOD3860.0[m]DC3881.0[m]DCOD3890.0[m]DC3899.0[m]DC3920.0[m]DC3920.0[m]DCOD3920.0[m]DCRRI3941.0[m]DC3941.0[m]DCOD3950.0[m]DC3955.0[m]DCOD3980.0[m]DC4010.0[m]DC4010.0[m]DCRRI4040.0[m]DC4070.0[m]DC4100.0[m]DC4130.0[m]DC4160.0[m]DC4190.0[m]DC4220.0[m]DC4250.0[m]DC4280.0[m]DC4298.0[m]DC -
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 availableDSTTEST23911.003926.00WATER17.12.1981 - 00:00YESDSTTEST33688.003697.0024.12.1981 - 00:00YESDSTTEST43643.003653.0029.12.1981 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit137879108813591926222523652365241824632510267527272825283028302841299832373335343634363445345235353535360536433643394541624162 -
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]pdf9.87pdf0.67pdf1.71pdf2.67pdf0.29pdf15.68pdf3.69pdf4.53pdf2.11pdf3.73pdf1.56pdf1.50pdf1.42pdf0.81pdf2.41pdf6.52pdf7.26pdf4.27pdf1.54pdf2.64pdf0.44pdf3.98pdf3.14pdf2.84pdf0.30pdf1.56pdf1.49pdf1.45pdf9.34pdf5.54pdf1.69pdf3.94pdf1.13 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04079408519.12.03911392616.73.03688369722.24.03543365322.2Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.04.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.03164270000.7540.85113512.03994860000.8110.94412183.04086570000.8460.84016104.02905500000.7990.8321897 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL27003980CBL VDL39124265CDL CNL11252883CDL CNL28623982CDL CNL32123703CDL CNL39754301COREGUN28623982COREGUN39754302DIPLOG28623892DIPLOG39754302DLL MLL35853982DLL MLL39754301IEL AC160513IEL AC4901199IEL AC11252883IEL AC28403703IEL AC35853982IEL AC39654230IEL AC41504301MFT28623982MFT239754302TEMP1801152TEMP2402844VELOCITY5253980 -
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 typeCONDUCTOR30187.036187.00.00LOTSURF.COND.20500.026515.01.71LOTINTERM.13 3/81185.017 1/21200.01.93LOTINTERM.9 5/82874.012 1/42890.01.75LOTLINER73990.08 1/23991.02.13LOTLINER4 1/24296.064300.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2071.03seawater11611.12seawater13871.10seawater24001.19waterbased25821.24waterbased36581.38waterbased39911.38waterbased41471.36waterbased -
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