2/1-3
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General information
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Wellbore history
GeneralWell 2/1-3 was drilled on the Cod Terrace on the margin between the southern Vestland Arch and the Central Trough in the North Sea. The primary objective of the well was to test Late Jurassic sandstone within a fault sealed dip closure, against the downthrown side of a westerly heading fault complex at the base of the Cretaceous. Triassic sandstone was a secondary objective.Operations and resultsWildcat well 2/1-3 was spudded with the semi-submersible installation SEDCO H on 3 November 1979 and drilled to TD at 4297 in the Late Permian Zechstein Group. The well was drilled with Seawater down to 625 m and with Lignosulphonate mud from 625 m to TD.Top of the Tyne Group, Mandal Formation, was encountered at 3791 m, with the Late Jurassic sandstone at 3819.5 m. The Late Jurassic sandstone reservoir was oil-bearing all through. The reservoir is a 59.5 m thick homogeneous fine to medium grained sandstone with a porosity from 15% to 22%. The sandstone grades into a well cemented argillaceous siltstone below. No oil/water contact was established. Oil shows were recorded in Tor Formation limestone at 3000 - 3005 m, throughout the Late Jurassic reservoir sandstone, and in Middle Jurassic Bryne Formation sandstone at 4020 to 4040 m.Four cores were cut from 3823.0 to 3893.5 m in the Ula Formation reservoir sandstones.The well was permanently abandoned on 29 March 1980 as an oil discovery.TestingThree drill stem tests were performed in the Late Jurassic sandstones.DST 1A perforated the interval 3863 to 3872.1 m and produced 226 Sm3 oil and 18689 Sm3 gas per day through a 40/64" choke. The GOR was reported to be 150 Sm3/Sm3 and the oil gravity was 41 deg API. The maximum bottom hole temperature recorded in the test was 151.1 deg C.DST 2 perforated the interval 3838.5 to 3844.6 m and produced 1051 Sm3 oil and 54991 Sm3 gas per day through a 32/64" choke. The GOR was reported to be 116 Sm3/Sm3 and the oil gravity was 39 deg API. The maximum bottom hole temperature recorded in the test was 150.0 deg C.DST 3 perforated the interval 3819.0 to 3825.1 m and produced 933 Sm3 oil and 39077 Sm3 gas per day through a 32/64" choke. The GOR was reported to be 108 Sm3/Sm3 and the oil gravity was 38 deg API. The maximum bottom hole temperature recorded in the test was 150.8 deg C. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]180.004296.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13823.03832.2[m ]23838.03855.7[m ]33856.43862.2[m ]43875.03893.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]51.1Cores 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 typeLaboratory3792.0[m]DCPETROSTR3801.0[m]DCPETROS3804.0[m]DCPETROS3810.0[m]DCPETROS3816.0[m]DCPETROS3822.0[m]DCPETROS3823.0[m]CPETROS3825.8[m]CPETROS3844.8[m]CPETROS3848.1[m]CPETROS3853.1[m]CPETROS3858.5[m]CPETROS3862.0[m]CPETROS3876.0[m]CPETROS3877.0[m]CPETROS3877.8[m]CPETROS3877.8[m]CPETROS3881.3[m]CPETROS3883.1[m]CPETROS3885.8[m]CPETROS3887.7[m]CPETROS3889.4[m]CPETROS3891.2[m]CPETROS3893.5[m]CPETROS3897.0[m]DCPETROS3903.0[m]DCPETROS3909.0[m]DCPETROS3915.0[m]DCPETROS3921.0[m]DCPETROS3927.0[m]DCPETROS3933.0[m]DCPETROS3939.0[m]DCPETROS3945.0[m]DCPETROS3951.0[m]DCPETROS3957.0[m]DCPETROS3963.0[m]DCPETROS3969.0[m]DCPETROS3975.0[m]DCPETROS3981.0[m]DCPETROS3987.0[m]DCPETROS3993.0[m]DCPETROS -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit96152327982798283828452910298729873000342435203524353435343579362537913791382038203991410141634219 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.71 -
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]pdf2.51pdf7.23 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03863387215.92.03839384512.73.03819382512.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0226190000.8201502.01051550000.8301163.0933390000.835108 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CALI6251825CBL VDL GR33953927CDL CNL GR35384270CDM35874221CDM AP35874221DLL MLL35873940FMT00GR CAL5500IEL BHC GR AC304273TEMP952250VELOCITY304273 -
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 typeCONDUCTOR30139.036143.00.00LOTSURF.COND.18 5/8595.024608.01.81LOTINTERM.13 3/81899.017 1/21910.01.92LOTINTERM.9 5/83558.012 1/43566.02.00LOTLINER73935.08 1/24267.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9301.15waterbased14221.30waterbased22271.57waterbased28131.60waterbased34091.63waterbased42971.68waterbased -
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