30/6-26
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General information
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Wellbore history
GeneralWell 30/6-26 was drilled on the Gamma West structure on the western flank of the Oseberg Field in the North Sea. The purpose of the well was to prove oil and gas in the Early Jurassic Statfjord Group.Operations and resultsWildcat well 30/6-26 was spudded with the semi-submersible installation Transocean Arctic on 15 September 2001 and drilled to TD at 2865 m in the Early Jurassic Statfjord Group. The well is classified as vertical, but from 300 to 800 m in the 17 1/2" section the deviation from vertical was up to 10.8 deg. Due to this the measured depth below 800 m is ca 5.5 m short of vertical depth. The well was drilled with sea water and hi-vis pills down to 1212 m and with Versavert oil based mud from 1212 m to TD.Top Statfjord Group was encountered at 2668 m. A 29 m gas column and a 43 m oil column were proven in the Upper Statfjord Group. The gas-oil-contact is interpreted at 2697 m (2692 m TVD) and the oil-water contact at 2741 m (2735 m TVD). The oil-bearing part of the Statfjord Formation has excellent reservoir properties. The oil zone is divided in two parts by a marine shale, which represents a ca 1.2 bar pressure barrier in the oil zone penetrated by the well. The Lower Statfjord Formation was water-bearing. Fluid samples confirmed the fluid types. No oil shows were described outside of the petroleum-bearing reservoir.One 28 m core was cut in the Upper Statfjord Formation from 2690 to 2718 m, with 98.9% recovery. The MDT wire line tool was used for formation pressure testing and fluid sampling. Twenty-five good pressure points were acquired. Fluid sampling was performed at 2772 m (water), 2735 m (oil), 2716 m (oil) and 2669 m (gas).The well was permanently abandoned on 7 October 2001 as a gas and oil discovery.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]1250.002865.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12690.02717.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]27.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit132623897956984106920062006210021822292230723072431259825982669 -
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].pdf7.54.pdf1.31 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR DSI VSP21002860GR MDT26692857GR MDT27162735MWD - DIR132196MWD - GR RES DIR1962636MWD - GR RES NEU DEN DIR26362865 -
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 typeCONDUCTOR30193.036193.00.00LOTSURF.COND.13 3/81217.017 1/21223.01.70LOTINTERM.9 5/82631.012 1/42636.01.50LOTOPEN HOLE2865.08 1/22865.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1941.08water based1951.0839.0water based3561.3631.0oil based10201.0838.0water based12231.3920.0water based20151.4528.0oil based25671.3631.0oil based26201.4532.0oil based26361.5036.0oil based26361.5037.0oil based26901.3523.0oil based27441.3523.0oil based28651.3524.0oil based28650.00oil based28651.3524.0oil based -
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]pdf0.23