34/8-6
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General information
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Wellbore history
GeneralWell 34/8-6 was designed to drill North of the Visund Field on a northerly trending arm of the Tampen Spur. The main structural feature in block 34/8, the A-structure, is a NNE-SSW oriented elongated rotated fault block with pre-Cretaceous strata dipping towards the WNW. The block contains the Visund field, and is divided into two compartments, the A-south and the A-north, by a central fault. The well will test a stratigraphic trap on the northwest flank of the A-structure. From seismic anomalies possible shallow gas was expected at 510 m, 544 m, 556 m, and 877 m. Levels at 544 m, and 556 m are dipping sand layers, and could contain gas with overpressure. Scattered boulders could be expected between 424and 540 m.The primary objective for well 34/8-6 was to test the presence of a hydrocarbon-bearing sand within the Upper Jurassic Draupne Formation, and was drilled close to the thickest portion of the interpreted turbidite sand. Secondary objectives were to drill through the Brent Group to yield more information about development and thickness control down dip of the structural crest, and to tag top of the Dunlin Group to permit a good seismic tie-in, which can be carried up dip towards the Visund reservoir.Operations and resultsWildcat well 34/8-6 was spudded with the semi-submersible installation Transocean 8 on 21 September 1991 and at a depth of 3950 m in the Early Jurassic Drake Formation. The well was drilled with spud mud down to 1235 m and with KCl mud from 1235 m to TD. Drilling went on without any significant problems. Shallow gas indications were encountered during drilling of the 8 1/2" pilot hole at 541 m and 550 m, but caused no problems, and no gas was observed at the wellhead during drilling operations. The gas indications did not correspond with any of the predicted sand layers.There was no sandstone developed at the primary objective in the Draupne Formation. Crude oil appeared in the mud after penetrating a thin (1 m) limestone at 3180 m in the Kyrre Formation. Oil was seen in the mud down to 3500 m, but it was believed that it all came from the limestone at 3180 m. One core was cut in the Draupne Formation from 3572 m to 3584 m. Two runs of sidewall cores were attempted whereof 19 were recovered. The well was permanently abandoned on 3 November 1991 as a dry hole with hydrocarbon shows.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]1240.003950.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13572.03584.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]12.6Cores 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 typeCONDUCTOR30485.036486.50.00LOTINTERM.18 5/81219.0241235.00.00LOTINTERM.13 3/82407.017 1/22423.01.62LOTOPEN HOLE3950.012 1/43950.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR24503930CST GR25153930DIL LSS GR SP AMS4851202DIL LSS GR SP AMS12212410DIL LSS GR SP AMS24023948FMS-4 NGT AMS31003940LDL CNL24023948MWD GR RES DIR4003898RFT HP GR36863825VSP11103880 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit400115911781402142118911891191619252127214521452340335234183418344034683477347735813686368637063724375738803880 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.51 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.92 -
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]pdf13.83 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4151.3614.05.0WATER BASED04.11.19914151.4618.06.0WATER BASED04.11.19914161.0522.017.0WATER BASED23.09.19914871.2016.09.0WATER BASED23.09.19914871.2016.09.0WATER BASED24.09.19919881.2017.09.0WATER BASED25.09.199110891.5019.06.0WATER BASED04.11.199112071.2017.09.0WATER BASED27.09.199112351.2016.09.0WATER BASED01.10.199112351.208.08.0WATER BASED01.10.199112351.2017.09.0WATER BASED27.09.199112351.2016.08.0WATER BASED01.10.199116741.2012.09.0WATER BASED01.10.199121641.3015.013.0WATER BASED02.10.199122311.3014.013.0WATER BASED03.10.199124231.3517.014.0WATER BASED04.10.199124231.3518.012.0WATER BASED07.10.199124231.3516.010.0WATER BASED07.10.199124231.3516.09.0WATER BASED08.10.199124231.3516.09.0WATER BASED07.10.199124391.3514.09.0WATER BASED09.10.199125271.4116.010.0WATER BASED10.10.199127801.4017.010.0WATER BASED11.10.199130451.4017.09.0WATER BASED15.10.199131661.4017.09.0WATER BASED15.10.199132231.4519.010.0WATER BASED15.10.199132781.4519.010.0WATER BASED17.10.199133621.4518.010.0WATER BASED17.10.199133651.4519.010.0WATER BASED18.10.199133721.5020.011.0WATER BASED18.10.199133721.4917.09.0WATER BASED21.10.199133721.4917.09.0WATER BASED21.10.199134221.5119.010.0WATER BASED21.10.199135241.6025.010.0WATER BASED22.10.199135761.6025.011.0WATER BASED23.10.199136061.6024.09.0WATER BASED24.10.199136901.6125.09.0WATER BASED25.10.199137951.6125.010.0WATER BASED29.10.199139501.6023.08.0WATER BASED29.10.199139501.6023.08.0WATER BASED29.10.199139501.6025.010.0WATER BASED31.10.199139501.5017.04.0WATER BASED01.11.1991 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1610.0[m]DCRRI1630.0[m]DCRRI1650.0[m]DCRRI1670.0[m]DCRRI1690.0[m]DCRRI1710.0[m]DCRRI1720.0[m]DCRRI1750.0[m]DCRRI1770.0[m]DCRRI1790.0[m]DCRRI1810.0[m]DCRRI1830.0[m]DCRRI1850.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1910.0[m]DCRRI1920.0[m]DCRRI1930.0[m]DCRRI1960.0[m]DCRRI1980.0[m]DCRRI2000.0[m]DCRRI2020.0[m]DCRRI2050.0[m]DCRRI2070.0[m]DCRRI2090.0[m]DCRRI2110.0[m]DCRRI2130.0[m]DCRRI2150.0[m]DCRRI2485.0[m]SWCHYDRO2667.0[m]SWCHYDRO3246.0[m]SWCHYDRO3284.5[m]SWCHYDRO3305.5[m]SWCHYDRO3325.0[m]SWCHYDRO3370.0[m]SWCHYDRO3401.0[m]SWCHYDRO3488.0[m]SWCHYDRO3572.0[m]CHYDRO3574.8[m]CHYDRO3576.0[m]CHYDRO3579.2[m]CHYDRO3582.0[m]CHYDRO3584.1[m]CHYDRO3632.0[m]SWCHYDRO3676.0[m]SWCHYDRO