6406/3-4
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General information
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Wellbore history
GeneralWell 6406/3-4 was drilled to appraise the Trestakk oil discovery made with well 6406/3-2. The primary purpose of the well was to appraise hydrocarbon accumulations of significant amounts in the Middle Jurassic reservoirs down flanks on the Trestakk structure. Secondary objectives were to check for hydrocarbon accumulations deeper than the structural closure of the main field, to verify the geophysical and structural interpretation, and improve the geological, paleontological and geochemical understanding of the area. Total depth was to be 50 m into the Ti1je Formation.Operations and resultsAppraisal well 6406/3-4 was spudded with the Dyvi Offshore semi-submersible installation Dyvi Delta on 25 September 1987 and drilled to TD at 4414 m in Early Jurassic Tilje Formation. The well was drilled with seawater and hi-vis pills down to 1179 m, with gypsum/polymer mud from 1179 m to 3984 m, and with gel/lignosulphonate mud from 3984 m to TD. Drilling proceeded without significant problems and there were no signs of shallow gas. An expected pressure build-up started in Paleocene and reached its maximum at 1.50 g/cm3 EMV in the top of Cretaceous. After this the over-pressure decreased and was at 1.42 g/cm3 EMV close to top Jurassic.A very weak show was recorded in association with a 2.61% gas peak at 2469 m in the Springar Formation. From 2450 m in the Nise Formation to 2670 m shows were recorded on 50 % of sandstone samples. These shows appeared to be a volatile, light petroleum and continued, gradually disappearing, down to 2750 m in the Nise Formation. Top reservoir came in at 4018 m. There were good shows on cores down to 4078 m, but the reservoir qualities did not seem to be very good due to low permeability. In the Ile Formation poor shows were recorded on cores, indicating tight rocks or residual oil. Residual shows were recorded also in the Tofte Formation, while weak "background" shows were recorded in the Tilje Formation from 4372 m to TD. Geochemical analyses of core sample extracts were consistent with a suggested contact/spill point at 4039 m, and a change in the hydrocarbon shows characteristics was confirmed at 4052 m. The geochemical analyses further confirmed that core chip extracts from the interval 4021.18 m to 4051.94 m in the Garn Formation, and a DST sample from the same formation in the discovery well 6406/3-2 belonged to the same oil family. A proposed OWC at 4074 m was not verified by the geochemical analyses. Results of the well 6406/3-4 indicated that reservoir properties decreased down flanks on the structure. As a result the reserve estimates for the Trestakk structure for oil and associated gas were reduced after drilling this well. Six cores were cut, four in the Garn Formation in the interval 4020 - 4122 m, and two in the Ile Formation in the interval 4156 - 4213 m. Two FMT fluid samples were taken, one at 4105.3 m and another at 4108 m. The well was permanently abandoned on 29 December 1987 as a dry hole with shows.TestingFour drill stem tests were carried out, one in the Ile Formation (DST 1) and three in the Garn Formation (DST 2, 3 and 4). DST 1 (4175 m to 4198 m) produced 1.8 - 2 m3 fluid/day. No samples were taken. DST 2 (4103 m to 4117 m) produced 60 m3 water/day decreasing to 2.7 m3 water/day. Bottom hole samples were taken. DST 3 (4054 m to 4082 m) produced 7.4 m3 water/day decreasing to 4 m3 water /day. Bottom hole samples were taken. DST 4 (4025 m to 4044 m) produced 2.6 m3/day decreasing to 1.6 m3/day. No sampling. -
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]1190.004413.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14020.04048.4[m ]24048.44076.6[m ]34076.54094.8[m ]44094.84122.7[m ]54156.04184.3[m ]64185.04212.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]158.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2475.0[m]DCRRI2490.0[m]DCRRI2505.0[m]DCRRI2520.0[m]DCRRI2535.0[m]DCRRI2550.0[m]DCRRI2565.0[m]DCRRI2580.0[m]DCRRI2628.0[m]DCRRI2649.0[m]DCRRI2655.0[m]DCRRI2682.0[m]DCRRI2712.0[m]DCRRI2724.0[m]DCRRI2742.0[m]DCRRI2754.0[m]DCRRI2772.0[m]DCRRI2784.0[m]DCRRI2802.0[m]DCRRI2814.0[m]DCRRI2832.0[m]DCRRI2844.0[m]DCRRI2874.0[m]DCRRI2892.0[m]DCRRI2904.0[m]DCRRI2944.0[m]DCRRI2952.0[m]DCRRI2964.0[m]DCRRI2982.0[m]DCRRI3012.0[m]DCRRI3026.0[m]DCRRI3042.0[m]DCRRI3044.0[m]DCRRI3054.0[m]DCRRI3084.0[m]DCRRI3114.0[m]DCRRI3129.0[m]DCRRI3144.0[m]DCRRI3159.0[m]DCRRI3174.0[m]DCRRI3184.0[m]DCRRI3204.0[m]DCRRI3214.0[m]DCRRI3234.0[m]DCRRI3249.0[m]DCRRI3264.0[m]DCRRI3279.0[m]DCRRI3294.0[m]DCRRI3304.0[m]DCRRI3324.0[m]DCRRI3339.0[m]DCRRI3354.0[m]DCRRI3369.0[m]DCRRI3384.0[m]DCRRI3399.0[m]DCRRI3414.0[m]DCRRI3429.0[m]DCRRI3434.0[m]DCRRI3444.0[m]DCRRI3454.0[m]DCRRI3459.0[m]DCRRI3474.0[m]DCRRI3489.0[m]DCRRI3504.0[m]DCRRI3519.0[m]DCRRI3534.0[m]DCRRI3549.0[m]DCRRI3564.0[m]DCRRI3579.0[m]DCRRI3594.0[m]DCRRI3604.0[m]DCRRI3624.0[m]DCRRI3639.0[m]DCRRI3644.0[m]DCRRI3654.0[m]DCRRI3669.0[m]DCRRI3684.0[m]DCRRI3714.0[m]DCRRI3729.0[m]DCRRI3744.0[m]DCRRI3759.0[m]DCRRI3774.0[m]DCRRI3789.0[m]DCRRI3804.0[m]DCRRI3819.0[m]DCRRI3834.0[m]DCRRI3849.0[m]DCRRI3864.0[m]DCRRI3879.0[m]DCRRI3894.0[m]DCRRI3909.0[m]DCRRI3924.0[m]DCRRI3990.0[m]DCRRI3996.0[m]DCRRI3999.0[m]DCRRI4002.0[m]DCRRI4008.0[m]DCRRI4011.0[m]DCRRI4014.0[m]DCRRI4017.0[m]DCRRI4023.0[m]DCRRI4029.0[m]CRRI4030.0[m]CRRI4034.0[m]CRRI4035.0[m]CRRI4041.0[m]CRRI4042.0[m]CRRI4046.0[m]CRRI4049.0[m]CRRI4054.0[m]CRRI4062.0[m]CRRI4068.0[m]CRRI4074.0[m]CRRI4079.0[m]CRRI4080.0[m]CRRI4087.0[m]CRRI4088.0[m]CRRI4089.0[m]CRRI4090.0[m]CRRI4096.0[m]CRRI4100.0[m]CRRI4105.0[m]CRRI4107.0[m]CRRI4114.0[m]CRRI4116.0[m]CRRI4118.0[m]CRRI4121.0[m]CRRI4122.0[m]CRRI4137.0[m]DCRRI4140.0[m]DCRRI4152.0[m]DCRRI4156.0[m]CRRI4158.0[m]CRRI4160.0[m]CRRI4161.0[m]CRRI4166.0[m]CRRI4170.0[m]CRRI4171.0[m]CRRI4174.0[m]CRRI4176.0[m]CRRI4181.0[m]CRRI4182.0[m]CRRI4185.0[m]CRRI4187.0[m]CRRI4192.0[m]CRRI4194.0[m]CRRI4198.0[m]CRRI4204.0[m]CRRI4212.0[m]DCRRI4221.0[m]CRRI4227.0[m]DCRRI4230.0[m]DCRRI4239.0[m]DCRRI4245.0[m]DCRRI4260.0[m]DCRRI4275.0[m]DCRRI4290.0[m]DCRRI4305.0[m]DCRRI4320.0[m]DCRRI4335.0[m]DCRRI4350.0[m]DCRRI4365.0[m]DCRRI4380.0[m]DCRRI4395.0[m]DCRRI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3253251514199419942314231423802437243726552974327832783884390839083949402540254121416242244224427242994372 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.65 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.28 -
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]pdf29.39 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04175419825.42.0410341177.93.0405440824.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.043.0002.041.0003.040.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.03.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL4301330CBL VDL25003974CBL VDL38174380CDL CN SPL GR39744406DIFL ACL GR39744414DIFL ACL GR CDL3231177DIFL ACL GR CDL11562665DIFL ACL GR CDL26483984DLL MLL GR39744412FMTHP GR40274391FMTHP GR40334105FMTHP GR41034402HRDIP39744411MWD - GR RES ROP DIR4424341VSP4404350 -
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 typeCONDUCTOR30436.036442.00.00LOTSURF.COND.201157.0261179.01.60LOTINTERM.13 3/82648.017 1/22692.01.87LOTINTERM.9 5/83970.012 1/43984.01.98LOTLINER74414.08 1/24414.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3751.03WATER BASED29.12.19874421.059400.0WATER BASED28.09.19874421.05105.0WATER BASED28.09.19875071.03WATER BASED28.12.19875261.03WATER BASED28.12.19875861.064400.04.5WATER BASED28.12.19877311.05120.0WATER BASED28.09.198711011.05100.0WATER BASED29.09.198711791.0595.0WATER BASED30.09.198711791.05100.0WATER BASED01.10.198711791.05100.0WATER BASED02.10.198711791.05100.0WATER BASED05.10.198711791.061500.05.1WATER BASED05.10.198711791.051200.03.4WATER BASED05.10.198711821.061500.04.7WATER BASED06.10.198714421.121300.04.2WATER BASED07.10.198716761.201400.04.2WATER BASED08.10.198719451.501900.04.2WATER BASED09.10.198720141.2416.03.5WATER BASED23.11.198723871.696300.04.5WATER BASED22.12.198723871.696300.04.5WATER BASED23.12.198724501.6018.08.0WATER BASED14.10.198724501.6020.08.0WATER BASED16.10.198725251.695300.04.5WATER BASED21.12.198725251.705000.03.0WATER BASED21.12.198725251.695100.03.5WATER BASED21.12.198725381.696000.04.5WATER BASED28.12.198726481.5317.07.0WATER BASED22.10.198726481.5312.09.0WATER BASED26.10.198726481.5313.09.0WATER BASED27.10.198726481.5316.06.5WATER BASED02.11.198726481.5316.07.0WATER BASED06.11.198726481.5349.05.0WATER BASED19.10.198726481.5350.04.0WATER BASED19.10.198726481.5319.05.0WATER BASED19.10.198726481.5321.06.0WATER BASED20.10.198726481.5319.070.0WATER BASED21.10.198726481.5316.07.0WATER BASED23.10.198726481.5316.07.0WATER BASED26.10.198726481.5316.08.0WATER BASED26.10.198726481.5315.09.0WATER BASED28.10.198726481.5313.08.0WATER BASED29.10.198726481.5318.08.0WATER BASED30.10.198726481.5317.016.0WATER BASED02.11.198726481.5318.07.5WATER BASED02.11.198726481.5317.06.5WATER BASED03.11.198726481.5317.06.0WATER BASED04.11.198726481.5315.06.0WATER BASED05.11.198726481.5353.06.0WATER BASED09.11.198726481.5312.05.0WATER BASED09.11.198726481.5312.04.0WATER BASED11.11.198726651.6020.08.0WATER BASED16.10.198731751.6924.03.5WATER BASED18.12.198731751.5325.02.0WATER BASED17.12.198737591.5323.02.0WATER BASED16.12.198739701.2416.03.5WATER BASED23.11.198739701.2417.03.0WATER BASED23.11.198739701.2418.03.0WATER BASED23.11.198739701.2416.03.0WATER BASED24.11.198739701.2421.04.0WATER BASED25.11.198739701.2315.04.0WATER BASED18.11.198739701.2417.08.0WATER BASED18.11.198739701.2416.08.0WATER BASED19.11.198739701.2417.04.0WATER BASED20.11.198739701.2415.08.0WATER BASED12.11.198739701.2416.06.0WATER BASED13.11.198739701.2414.08.0WATER BASED16.11.198739701.2214.04.0WATER BASED16.11.198739701.2216.08.0WATER BASED16.11.198740501.2419.03.0WATER BASED14.12.198740501.2419.02.5WATER BASED15.12.198740861.2419.03.0WATER BASED14.12.198740861.2418.03.0WATER BASED08.12.198740861.2419.03.0WATER BASED09.12.198740861.2419.03.0WATER BASED10.12.198740861.2418.03.0WATER BASED11.12.198740981.2419.03.0WATER BASED07.12.198741251.246600.03.0WATER BASED03.12.198741251.246400.03.0WATER BASED04.12.198741251.2420.03.0WATER BASED07.12.198741251.2419.03.0WATER BASED07.12.198741251.246100.03.0WATER BASED02.12.198741561.2216.08.0WATER BASED16.11.198743711.246800.03.5WATER BASED30.11.198743711.246600.03.5WATER BASED30.11.198743711.2421.04.0WATER BASED01.12.198743711.246700.03.5WATER BASED30.11.198744141.2417.04.0WATER BASED20.11.1987 -
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]PDF0.22