34/8-2
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General information
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Wellbore history
GeneralWell 34/8-2 was drilled ca 5 km east of the 34/8-1 Visund Discovery well in the northern North Sea. It was drilled on the northern compartment of the same structure as the 34/8-1 well, a rotated fault block flanking the Viking Graben. This northern compartment ("A-North") might be separate from the southern by a sealing fault. The main objective of well 34/8-2 was to prove hydrocarbons in the Stafjord Formation of the A-North compartment. The planned TD was ca 50 m into the Triassic Lunde Formation.Operations and resultsWildcat well 34/8-2 was spudded with the semi-submersible installation Polar Pioneer on 4 October 1986 and drilled to TD at 3240 m in the Late Triassic Lunde Formation. The rig had to be moved and the well was re-spudded twice before the 36" hole could be finished. Otherwise no significant problems were encountered in the operations. The well was drilled with seawater and hi-vis pills down to 1205 m and with KCl/polymer mud from 1205 m to TD.A unit assigned to the Late Jurassic Draupne Formation was penetrated from 2896 to 2912.5 m. Below Draupne a complete Dunlin Group (Drake-Cook-Burton-Amundsen) was penetrated down to 3001 m where the Statfjord Formation was encountered. The target Statfjord Formation was water bearing, and the only hydrocarbon indications in the well were oil shows on sandstone stringers in the Shetland Formation and weak fluorescence on Draupne Formation claystoneOne core was taken in the well in the upper part of the Statfjord Formation from 3008 - 3020 m. The recovery was 11.75 meters, 98%. RFT pressure recordings were performed through the Statfjord Formation and the Lunde Formation. The pressure tests in the Statfjord Formation indicated very good permeability and gave a water gradient of 0.99 g/cc. Furthermore. Comparison with 34/8-1 pressures indicated a sealing fault between the A-South and the A-North segments. No wire line fluid samples were taken.The well was permanently abandoned on 17 November as a dry well.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]1220.003240.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13008.03019.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]11.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2888.0[m]SWCHYDRO?2898.5[m]SWC(ALLE)2902.0[m]SWC2905.0[m]SWC2908.0[m]SWC2911.0[m]SWC2919.0[m]SWC2935.0[m]SWC2974.0[m]SWC2990.0[m]SWC3053.0[m]SWC3077.0[m]SWC3111.0[m]SWC3135.0[m]SWC -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit37611141160181718171853198819882218269928822897289729132913292329342937300130513051 -
Geochemical information
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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]pdf2.19pdf12.59 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL00DIL LSS GR SP11773228LDL CNL CAL GR11773228MWD4621177NGT26803229RFT30033218SHDT26803231VSP10003235 -
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 typeCONDUCTOR30462.036472.00.00LOTSURF.COND.201177.0261205.01.66LOTINTERM.13 3/82680.017 1/22700.01.80LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3761.7034.012.0WATER BASED17.11.19863911.0599.099.0WATER BASED05.10.19864201.7034.012.0WATER BASED17.11.19864281.05WATER BASED07.10.19864621.0599.099.0WATER BASED06.10.19864621.0599.099.0WATER BASED05.10.19864721.05WATER BASED08.10.19864831.05WATER BASED14.10.19869821.05WATER BASED14.10.198610481.05WATER BASED09.10.198612001.05WATER BASED14.10.198612001.20WATER BASED13.10.198612051.20WATER BASED14.10.198612051.2014.08.0WATER BASED17.10.198612051.159.04.0WATER BASED16.10.198615851.3020.012.0WATER BASED20.10.198618481.3620.013.0WATER BASED20.10.198621351.3620.012.0WATER BASED20.10.198622811.4024.010.0WATER BASED20.10.198624521.4425.010.0WATER BASED21.10.198624611.4424.09.0WATER BASED22.10.198625151.7034.012.0WATER BASED17.11.198625621.4429.011.0WATER BASED23.10.198626091.4429.09.0WATER BASED26.10.198627001.4426.08.0WATER BASED26.10.198627001.4727.09.0WATER BASED26.10.198627001.6030.07.0WATER BASED28.10.198627001.4727.09.0WATER BASED27.10.198627051.6023.07.0WATER BASED29.10.198627641.6026.09.0WATER BASED30.10.198628111.6027.09.0WATER BASED02.11.198628281.6028.010.0WATER BASED02.11.198628751.6030.011.0WATER BASED02.11.198629441.7028.09.0WATER BASED03.11.198629951.7029.09.0WATER BASED04.11.198630201.7029.010.0WATER BASED05.11.198630381.7032.012.0WATER BASED06.11.198630651.7033.012.0WATER BASED11.11.198631381.7033.011.0WATER BASED11.11.198631551.7030.08.0WATER BASED11.11.198632031.7032.011.0WATER BASED09.11.198632401.7030.010.0WATER BASED12.11.198632401.7030.010.0WATER BASED13.11.198632401.7032.010.0WATER BASED14.11.1986 -
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