7121/5-3
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General information
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Wellbore history
GeneralWell 7121/5-3 is located southeast of Snøhvit and northeast of Albatross in the Hammerfest Basin in the Troms I area. Block 7121/5-3 is characterised by a set of east-west running faults cutting Middle Jurassic sediments. The main objective of well 7121/5-3 was to prove hydrocarbons in the "Delta" prospect sandstones of the Nordmela and Stø Formations of Early to Middle Jurassic age.Operations and resultsWildcat well 7121/5-3 was drilled with the semi-submersible installation "Transocean Arctic". First, a 9 7/8" pilot hole was drilled from sea bed to 967 m. On 16 February 2001 well 7121/5-3 was spudded 24 m WNW of the pilot hole and drilled to a total depth of 2265 m in rocks of Late Triassic age (Snadd Formation). The well was drilled with seawater and bentonite down to 967 m, and with "GLYDRIL" mud with glycols from 967 to TD. In the "GLYDRIL" section the mud was a mixture of new and re-used mud from a previous well. MWD logs in the pilot hole showed that only Palaeocene and possibly Eocene sediments were preserved in the Tertiary section. Only a thin glaciomarine Quaternary sequence was present in the well. Good reservoir zones were recorded in the Stø, Nordmela and Tubåen Formation sandstones. The sand sequences of these formations proved to be water bearing. This was verified by interpretation of logs and MDT pressure measurements, though weak to good shows were recorded in cores from the reservoir intervals. Two cores were cut, the first in the Stø Formation sandstone and the second in the Tubåen Formation sandstone. Two water samples were taken, the first in the Stø Formation at 1881 m MD and the second in the Tubåen Formation at 1991 m MD. The well was permanently abandoned as a dry well with shows on 9 March 2001.TestingNo drill stem test was performed. -
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]980.002265.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11887.01915.0[m ]21992.02017.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30429.036430.00.00LOTSURF.COND.13 3/8960.017 1/2960.01.65LOTOPEN HOLE1500.012 1/41500.00.00LOTOPEN HOLE2265.08 1/22265.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CSI GR4402252DSI CMR-PLUS ACTS18632157HALS PEX DSI ACTS5052262MDT GR ACTS18852232MWD369967MWD MPR369950MWD MPR9671887MWD MPR19151992MWD MPR20192265VSP4401490VSP14902252 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit369412412844844865865162517901832188018801928198420342223 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.35 -
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].PDF36.73 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4311.03DUMMY8651.03DUMMY9501.03DUMMY11381.2519.0GLYDRILL15001.2514.0GLYDRILL17411.2514.0GLYDRILL18811.2513.0GLYDRILL18871.2514.0GLYDRILL19921.2514.0GLYDRILL20191.2514.0GLYDRILL22291.2514.0GLYDRILL22651.2513.0GLYDRILL -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1999.75[m ]2003.25[m ]2013.75[m ]