6407/8-4 S
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General information
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Wellbore history
GeneralThe Galtvort well 6407/8-4 S is located on the eastern margin of the Gimsan Basin in the Norwegian Sea, ca 7 km northwest of the Draugen Field. The primary objective was to test the hydrocarbon potential of the Middle Jurassic Garn and Ile Formations of the Galtvort prospect. The secondary objective was to test the hydrocarbon potential of prospective formations in the Early Jurassic Båt Group.Operations and resultsWildcat well 6407/8-4 S was spudded with the semi-submersible installation West Alpha on 20 April 2008 and drilled to TD at 2788 m (2650.3 m TVD) in the Early Jurassic Åre Formation. The well was drilled vertical down to 1240 m, and then deviated with up to 39 deg inclination at 1980 m, then falling off to 19.5 deg at TD. The well was drilled with water based spud mud down to 930 m, and with Glydril mud from 930 m to TD. No significant technical problems were encountered in the operations. No shallow gas was observed by the ROV at the wellhead or by the MWD while drilling the 26" hole.The well penetrated rocks of Quaternary, Tertiary, Cretaceous, and Jurassic age. The Garn reservoir section was encountered at 2212 m (2118 m TVD), 77 m shallower than prognosed, and proved a GWC at 2280 m (2178 m TVD). The remaining reservoirs were found to be water bearing, but residual oil staining and high gas readings from cuttings during drilling, log responses and oil shows on core indicated residual hydrocarbons in the Ile Formation.One 27.2 m core was cut from 2221.0 - 2248.2 m in the Garn Formation. The general lithology in this core was sandstone with traces of claystone. A second core was cut from 2379.0 - 2405.3 m (26.3 m long) in the Ile Formation. The general lithology in this core was sandstone with shale laminations. MDT wire line gas samples were taken at 2232 m and at 2186.5 m. Sampling was performed with only a few bar drawdown and the samples are believed to be representative of the formation fluids.The well was permanently abandoned on 21 May 2008 as a gas discovery.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]940.002788.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12221.02248.2[m ]22379.02405.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.5Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit284284997102510251665166517381937193720472178217821842187219822122212230723752422242225502724 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]txt0.00txt0.07 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR HRLA PEX ECS HNGS21772788FMI GR21802780FMI PPC MSIP PPC GR15002785MDT GR21862737MDT GR21862186MSCT GR21812426MWD - DIR284347MWD - GR RES DIR347930MWD - GR RES DIR PWD9302015MWD - GR RES DIR PWD DEN NEU TT20152221MWD - GR RES DIRPWD OT22212788VSP GR7432785 -
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 typeCONDUCTOR30345.036347.00.00LOTSURF.COND.20917.026930.01.68LOTINTERM.13 3/82004.017 1/22015.01.91LOTINTERM.9 5/82175.012 1/42219.00.00LOTOPEN HOLE2788.08 1/22788.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9201.3918.0Glydril13621.4520.0Glydril18081.3020.0Glydril20151.4618.0Glydril20241.4119.0Glydril20281.4120.0Glydril22191.4120.0Glydril22201.3014.0Glydril22491.3014.0Glydril24051.3016.0Glydril27881.3017.0Glydril -
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]pdf0.30