25/2-6
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General information
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Wellbore history
GeneralExploration well 25/2-6 was located in the Viking Graben on the same main structure as well 25/2-5 targeting the Jurassic were oil bearing, while the Statfjord sands gave good oil shows. 25/2-6 was drilled on the northwestern flank of a structure that was about ten years later discovered as the Frøy Field.The well is Type Well for the Hermod Formation.Operations and resultsThe well was spudded with the semi-submersible installation Polyglomar Driller on 1 August 1977 and drilled to TD at 3750 m in the Triassic Smith Bank Formation.The well penetrated two Paleocene sands, the Hermod Formation from 2221 m to 2361 m and the Ty Formation from 2563 m to 2631 m. No shows were recorded in these sands. The Jurassic contained two major sandy but somewhat heterolithic sequences in the Vestland Group and Statfjord Formation.Four conventional cores were cut in the well, one from 3159.6 m to 3165 m in the Heather Formation, two from 3253.4 m to 3271.8 m in the Hugin and Sleipner formations, and one from 3509 .7 m to 3518.9 m in the Statfjord Formation. Good oil shows were recorded on the lower part of the Statfjord core. An extensive pressure and fluid sampling programme was carried out in the Jurassic with 19 RFT samples from the interval 3242.5 m in the Vestland Group and 24 RFT samples and four FIT samples from the interval 3505.1 m to 3648 m in the Statfjord Formation. Fluid samples were taken from four depths in the Sleipner and Hugin formations (3243.3 m, 3257.8 m, 3267.5 m, and 3286 m). Only one of the samples (3286 m) recovered fluid that was representative for the formation and this sample contained water with dissolved gas. In the Statfjord Formation Test No. 28 at 3563 m recovered after 7 minutes 2 litres of oil, 7 litres of gas, and 1.5 litres of emulsion. Test No. 38 at 3568,3 m recovered 0,35 litres of oil, 110 litres of gas, and 2,65 litres of mud and filtrate. From the test results, the log analysis, and fluorescence on sidewall cores, the Statfjord formation was found oil-bearing in a good sand interval from 3559 m to 3571 m.The well was permanently abandoned on 15 November 1977 as an appraisal well for the Lille Frøy Discovery and with minor oil in the Statfjord formation.TestingNo drill stem test was performed. -
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]200.003756.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13159.63165.1[m ]23253.43262.4[m ]33262.43271.8[m ]43509.73518.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]32.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableRFT3561.000.00WATERNORFT3267.000.00WATERYES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit141500550897926109614031491214821482209222123612463256326312631293130213083308331373241324132573317350437053705 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.43 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.82PDF0.13PDF4.92 -
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]pdf48.39PDF5.04pdf14.67pdf2.84 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR28243104BHC GR30003135BHC GR31283218BHC GR ISF31283356BHC GR ISF33253542CAL31283750CBL516847CBL15752824CBL24503144CBL25893201DLL MSFL32253745FDC GR CNL31273356GR SPEC31283750HDT7423747ID7422834ID7504625ISF28253135ISF31283799ISF SL GR141712VELOCITY00 -
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 typeCONDUCTOR30190.036190.00.00LOTSURF.COND.20750.026750.00.00LOTINTERM.13 3/82824.017 1/22839.00.00LOTINTERM.9 5/83126.012 1/43135.00.00LOTOPEN HOLE3750.08 1/23750.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1901.07spud mud7121.0760.0water based18581.1637.0water based28391.2545.0water based30711.3058.0water based37501.3555.0water based -
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]pdf0.23