6407/8-4 A
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General information
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Wellbore history
GeneralWell 6407/8-4 A is a sidetrack from the Galtvort well 6407/8-4 S, located on the eastern margin of the Gimsan Basin in the Norwegian Sea, ca 7 km northwest of the Draugen Field. A main fault separates the middle and northern segments of the Galtvort structure from the southern segment. The southern segment was tested in well 6407/8-4 S and found gas in the Fangst Group. The primary objective of the sidetrack was to test the hydrocarbon potential of prospective formations in the middle and northern segments in order to test the sealing potential of the main fault crossing the structure.Operations and resultsWildcat well 6407/8-4 A was drilled with the semi-submersible installation West Alpha as a sidetrack. It was kicked off from a milled window (1497 - 1502 m) in the 13 3/8" casing in 6407/8-4 S on 22 May 2008 and drilled to TD at 2473 m (2319 m TVD) in the Early Jurassic Åre Formation. The well was drilled with Glydril mud from kick-off to TD. No significant technical problems were encountered in the operations.Prior to drilling it was prognosed that the sidetrack should penetrate the same formations as well 6407/8-4 S. Due to a much larger fault throw between the Middle and the South Galtvort Segments and hence more extensive uplift and erosion of the Middle and North Segments than anticipated, the entire Fangst Group was eroded. As a result the well penetrated directly from the Cretaceous Kvitnos Formation and into the Båt Group at 2117.8 m (2026.7 m TVD). The upper part of the Båt Group consisted of Ror Formation mudstones and only thin Tofte equivalent sandstones of mediocre reservoir quality. The underlying Tilje Formation came in at 2217 m (2106 m TVD) and was gas bearing down to a GWC somewhere in the interval 2175 to 2183 m TVD SS. Weak oil shows were observed in cuttings between 2226 m to 2274 m in the Tilje Formation. Otherwise no oil shows were observed in the sidetrack wellbore.No cores were cut in this wellbore. MDT wire line gas samples were taken at 2219 m, 2120.4 m, and at 2121 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 16 June 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]1510.002463.00 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2830.0[m]DCSHYDRO2835.0[m]DCSHYDRO -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit284284997102510251658165817311910191020812118211822172424 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]txt0.00txt0.09 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR MDT GR21102224FMI HNGS20622473MSIP HRLA PEX ECS15002476MWD - GR RES DIR PWD14972473 -
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 typeINTERM.9 5/82062.012 1/42062.01.85LOTOPEN HOLE2473.08 1/22473.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured15071.4620.0Glydril15461.5023.0Glydril18201.5021.0Glydril20621.5019.0Glydril21001.3117.0Glydril21801.3115.0Glydril22221.3115.0Glydril22651.3017.0Glydril23721.3020.0Glydril24731.3012.0Glydril24731.2011.0Glydril -
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