35/11-12
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General information
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Wellbore history
GeneralWell 35/11-12 is situated North of the Troll Field. Its main objectives were to test the presence and type of hydrocarbons in the Oxfordian turbidites in the Amanda prospect. The well was positioned to test the largest possible HC - column in the stratigraphic trap component of the Amanda prospect, with good margin to the mapped spill point. A secondary objective was to test the presence of potential Callovian turbidites.Operations and resultsWildcat well 35/11-12 was spudded with the semi-submersible installation "Transocean Arctic" on 19 April 2000 and drilled to a total depth of 3378 m in Middle Jurassic shales of the Heather Formation. The well was drilled with spud mud down to 725 m and with water based "Glydril" mud (with glycol) from 725 m to TD. Two turbidite sequences of Kimmeridgian and Oxfordian age respectively, were penetrated. The sequences contained predominantly claystones, but comprised also thin sandstone beds of very poor reservoir quality. No fluid contacts or fluid gradients were identified from the log and pressure data.A MDT oil sample was taken at 3211.0 m within a two-meter thick porous sandstone of the Oxfordian sequence. The reservoir pressure at the sampling point was measured to 359.23 bar. Maximum draw down during pumping was approximately 110 bar and the maximum temperature recorded was 107.5 deg C. The sample contained mostly water with some oil. One core was cut in the interval 3120 to 3146 m in the upper Oxfordian turbidite and the Heather Formation.The well was permanently abandoned as a dry well with shows on 14 May 2000.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]730.003377.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13120.03146.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]26.0Cores 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 typeCONDUCTOR30460.036460.00.00LOTINTERM.20720.026725.01.64LOTINTERM.13 3/81755.017 1/21760.01.37LOTINTERM.9 5/82809.012 1/42822.01.75LOTOPEN HOLE3378.08 1/23378.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR28923378DSI GR26003380MDT AMS GR31243212MWD - CDR3881760MWD - CDR ISONIC17602822MWD - V675R GST ADN28223120MWD - V675R GST ADN31203378VSP GR25703360 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38876988089617271727178118031986201920192095271927452745278627982808287828912891313032083213 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.35 -
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].pdf2.20.PDF4.98 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4601.20WATER BASED5001.20WATER BASED6001.3019.0WATER BASED7251.30WATER BASED7501.3019.0WATER BASED8501.3018.0WATER BASED14731.3923.0WATER BASED17601.3920.0WATER BASED17641.3015.0WATER BASED22121.3022.0WATER BASED27091.5022.0WATER BASED27111.3020.0WATER BASED28221.3020.0WATER BASED30501.4620.0WATER BASED31401.4620.0WATER BASED32911.4622.0WATER BASED33781.5022.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory0.0[unknown] -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3123.17[m ]3120.92[m ]3123.15[m ]3124.71[m ]