15/5-6
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General information
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Wellbore history
GeneralWell 15/5-6 was drilled on the Glitne field in the North Sea. The main objective was to appraise the 15/5-5 Glitne oil discovery in the Heimdal Formation. The secondary objective was to investigate the oil potential of a separate "Intra Lista Sandstone" which had been mapped as a sequence lapping onto the main Heimdal Formation.Operations and resultsAppraisal well 15/5-6 was spudded with the semi-submersible installation Byford Dolphin on 20 June 1997 and drilled to TD at 2725 m in the Paleocene Ekofisk Formation. The drilling went according to plan. However, problems due to poor hole conditions were encountered during wire line logging at TD. The well was drilled with seawater and hi-vis pills down to 1002 m and with KCl/polymer/glycol mud from 1002 m to TD.The top of the main Heimdal reservoir was penetrated 39 m TVD deeper than prognosed. The top corresponded seismically to the reflector that pre-drill was interpreted as the top "Intra Lista Sandstone", so the general consensus is now that the reflector is actually the top Heimdal Formation and that the "Intra Lista Sandstone" sequence is not present.The uppermost part of the Heimdal reservoir was oil bearing, exhibiting good reservoir properties. The OWC was found at 2185 m (2160 m TVD MSL), equivalent to the contact in well 15/5-5. No other parts of well 15/5-6 contained hydrocarbons or shows of hydrocarbons.One core was cut in the upper part of the Heimdal Formation. No fluid sample was taken in the well.The well was permanently abandoned on 16 July 1997 as an oil appraisal.TestingThe well was not production tested due to the limited oil column and no "Intra Lista Sandstone" being present. -
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]1010.002724.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12180.02202.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]22.3Cores 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 typeCONDUCTOR30194.036194.00.00LOTSURF.COND.13 3/8995.017 1/21002.00.00LOTOPEN HOLE2725.08 1/22725.01.78LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]FMT GR21712217MAC DLL MLL DSL7241675MAC DLL MLL DSL9951812MAC DLL MLL DSL9952722MWD DPR2002725RCI GR00VSP4002710XDL CND GR9952677XDL CND GR17212171 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit133728895153918392045204520982145217225922616265626742674 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.33 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf3.11 -
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]pdf8.62pdf48.29 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured10021.03DUMMY10021.03DUMMY18871.2518.0QUADRILL19401.4323.0QUADRILL19491.4322.0QUADRILL22041.2515.0QUADRILL27251.5024.0QUADRILL27251.4323.0QUADRILL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2148.5[m]SWCWESTL2155.0[m]SWCWESTL2163.0[m]SWCWESTL2182.4[m]CWESTL2182.6[m]CWESTL2183.7[m]CWESTL2184.3[m]CWESTL2185.7[m]CWESTL2187.6[m]CWESTL2189.0[m]CWESTL2190.4[m]CWESTL2194.6[m]CWESTL2194.7[m]CWESTL2202.3[m]CWESTL2226.0[m]SWCWESTL2263.0[m]SWCWESTL2291.0[m]SWCWESTL2324.0[m]SWCWESTL2366.0[m]SWCWESTL2372.0[m]SWCWESTL2589.0[m]SWCWESTL2608.0[m]SWCSWC