34/10-33 B
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General information
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Wellbore history
GeneralWell 34/10-33 B is a sidetrack from the vertical appraisal well 34/10-33 on the Gullfaks South structure. It was the first horizontal well ever drilled on the Norwegian continental shelf. The main purpose of the well was to perform a long period test from a horizontal well through the upper part of the Brent Group. The well should provide important production data and the results from the well should be used to calibrate the simulation model for the reservoir and also to update the geological model for this part of the Brent Group.Operations and resultsAppraisal well was sidetracked 27 April 1989 from the vertical at 1840 m, just below the 13 3/8" casing shoe. The well was drilled with the semi-submersible installation Deepsea Bergen to TD at 3942 m in the Late Jurassic Heather Formation. The well bore was drilled with gel/lignosulphonate mud from kick-off to 1864 m and with Interdrill NT oil based mud from 1864 m to TD. The hole was approximately horizontal in the interval 3670 - 3942 m. During setting of the 7" liner for testing of the hydrocarbon zone, the pipe got stuck and broke between the extension pipe and drill string. Fishing was unsuccessful, and the planned test was therefore not possible. Plugging was performed, and Statoil informed NPD and the partners about the alternatives for future operations. After evaluation of FMT data, it was decided to go for a new sidetrack, 34/10-33 C.The formation tops came in close to the prognosis. The Brent Group, top Tarbert Formation was encountered at 3215 m. Sandstones of the Brent Group contained oil and gas. Due to lateral pressure barriers the Tarbert Formation proved to be water bearing in the horizontal part of the well bore, although good oil shows were described on cores and well site samples up to 3816 m.Three cores were cut in the intervals 3742 - 3751 m, 3785 - 3790 m, and 3850.5 - 3860 m in the Tarbert Formation. Two runs with the FMT tool on drill string was performed in the horizontal part of the well. In addition, five tests behind the 9 5/8" casing was performed with CHFT (Cased Hole Formation Tester). One segregated fluid sample was taken with FMT at 3892 m (1 litre water and 8 litres oil/filtrate). Two segregated fluid samples were taken with CHFT at 3299.5 m (3.2 Sm3 gas, 0.9 litre fluid) and at 3335.0 m (2.4 Sm3 gas and 1.1 litre fluid).The well was plugged back and abandoned on 10 July 1989 for the sidetrack 34/10-33 C.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]1850.003942.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13742.03751.0[m ]23785.03790.6[m ]33850.03859.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]24.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1579639741029113912471513156216101821182118972048204823403008300830123012304532153215335336793897 -
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]pdf1.53pdf36.21pdf32.19 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4 ARM CAL GR18223419ACBL VDL CCL GR18003475CDL CN GR31853475CHFT HP GR32380CHFT HP GR32990CHFT HP GR33350CHFT HP GR33360CHFT HP GR33580FMT HP GR35513894FMT HP GR35513892GYRO CCL GR16903440MWD - GR RES NEU POR DEN18403942 -
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 typeCONDUCTOR30219.036220.00.00LOTINTERM.20459.026461.01.43LOTINTERM.13 3/81822.017 1/21838.01.53LOTINTERM.9 5/83484.012 1/43493.01.70LOTOPEN HOLE3942.08 1/23942.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured18401.4421.09.0WATER BASED09.05.198918641.4518.05.5OIL BASED09.05.198921001.4524.03.0WATER BASED03.05.198929821.5824.06.5OIL BASED19.05.198930241.5826.06.0OIL BASED19.05.198930881.5822.07.0OIL BASED19.05.198931711.5825.07.0OIL BASED19.05.198932001.5823.06.5OIL BASED19.05.198932411.5822.06.5OIL BASED19.05.198932411.5826.07.0OIL BASED19.05.198934021.5827.013.0OIL BASED24.05.198934151.5827.06.5OIL BASED24.05.198934581.5827.07.0OIL BASED24.05.198934841.5025.06.5OIL BASED07.06.198934851.5024.06.0OIL BASED08.06.198934931.5828.07.0OIL BASED25.05.198934931.5931.07.0OIL BASED29.05.198934931.4220.06.0OIL BASED02.06.198934961.4218.08.5OIL BASED05.06.198935881.4220.06.5OIL BASED05.06.198936251.4225.07.0OIL BASED05.06.198936281.5324.09.5OIL BASED09.06.198937301.5524.09.0OIL BASED12.06.198938601.5720.010.0OIL BASED19.06.198939421.6028.010.0OIL BASED20.06.1989 -
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