17/12-2
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General information
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Wellbore history
GeneralWell 17/12-2 is located on the northwestern margin of the Egersund Basin in the North Sea, ca 14 km southwest of the 17/12-1R Discovery. The primary objective was to test Middle Jurassic and/or Triassic sands. Both had been found present in the 17/12-1R well where the Middle Jurassic sand was oil-bearing (Bream Discovery). The Triassic sands could be oil-bearing, especially if overlain by Jurassic shale. A secondary objective was seen in the Late Cretaceous limestones. Planned TD was at 3658 m (12000 ft) or 100 m into Zechstein salt.Operations and resultsWildcat well 17/12-2 was spudded with Ocean Viking on 31 August 1973 and drilled to TD at 2334 m in Devonian sand.No shows were present in the Late Cretaceous Limestone. An oil-bearing Jurassic sand 13 m thick (7 m net pay) was encountered at 2157 m. The Triassic was absent and the Jurassic Sandnes and Bryne Formations rested directly on a 50 m thick layer of Permian salt at 2243 m. Below the salt was a 7 m thick Rotliegendes sequence. Sandstone of possible Devonian age was encountered at 2300 m. This remnant Paleozoic feature caused the well to be terminated higher than originally anticipated.One conventional core was cut at TD from 2330.8 m to 2333.9 m. No wire line fluid samples were taken.The well was permanently abandoned on 9 October 1973 as an oil Discovery.TestingTwo drill stem tests were carried out. DST1 from 2166 m to 2169 m produced 16 m3 water cushion and 1 m3 oil. After the final flow period water cushion and formation fluid was reversed out. DST2 from 2157 m to 2162 m produced at maximum 366 m3 oil and 31800 m3 gas / day. Gas-oil ratio was 87 m3/m3 and oil gravity was 27.9 °API. -
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]609.602333.24 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom17647.07656.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]2.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30154.036155.00.00LOTSURF.COND.20493.026495.00.00LOTINTERM.13 3/81082.017 1/21084.00.00LOTINTERM.9 5/82334.012 1/42334.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0216621690.02.0215721626.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.04.0003.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.012.0366318200.88787 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC4781095BHC-C10832328CBL19812194CDM18292329CDM AP18282329CDM PP18282329CDR18292329DL20122328FDC CAL20122268GR101478IES4781098IES10832332MUD3052334SNP CAL20122329SRS4782327 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9370792492495195798799114761932215721572179224322932300 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.24 -
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]pdf4.74pdf1.07 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4931.04SEAWATER7011.1148.0waterbased12501.3150.0waterbased17401.3143.0waterbased19431.3348.0waterbased23331.3447.0waterbased -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory7200.0[ft]DC7340.0[ft]DC