1/6-2
Export: PDF
-
General information
-
Wellbore history
GeneralWell 1/6-2 was drilled between the Albuskjell and Flyndre Fields in the Feda Graben of the North Sea. The primary objective was to evaluate the Danian and Maastrichtian Chalk prospects (Ekofisk and Tor Formations) of a prominent diapiric domal structure. The well was placed on the flank of the structure.Operations and resultsWildcat well 1/6-2 was spudded with the jack-up installation Zapata Nordic on 28 November 1972 and drilled to TD at 3383 m in the Late Cretaceous Hod Formation. Some downtime recorded in the top hole was due to a defect 20" casing shoe and bad weather, otherwise operations went forth without significant problems. The maximum deviation down to 3226.6 m was 3.5 deg. The well was drilled with Sea water and viscous mud down to 460 m, with Shaletrol mud from 460 m to 2445 m, and with Unical mud from 2445 m to TD.In the Tertiary shale sequence potential reservoirs were limited to a few very thin (0.5 m or less) limestone or dolomite streaks. Top of the Chalk was encountered at 3024 m. The reservoir development in the Chalk was rather poor throughout, with the exception of a zone of ca 12 m in the Danian Ekofisk Formation having a porosity of about 26%. The Chalk formations were entirely water bearing as seen on the logs. However, weak hydrocarbon indications were observed in the Chalk (namely weak fluorescence and occasional slight oil staining), and relatively more abundant indications of oil staining and dead oil traces were recorded in the overlying Tertiary shales and interbedded carbonate layers.One core was cut from 3226.6 m to 3241.5 m in the Tor Formation. The core confirmed the generally dense nature of the Chalk in this section. No wire line fluid samples were taken.The well was permanently abandoned on 12 January 1973 as a dry well with 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]182.883383.28 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom110584.810633.6[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]14.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1051759289528952902290629513024302430903295 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.40 -
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]pdf1.94pdf20.82 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGL5501530BGL15112550BHC GR151111077CBL39008000CNL980011113FDC980011113HDT40098035HDT800211108ISF402111106LL9800211101 -
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 typeCONDUCTOR30176.036176.00.00LOTSURF.COND.20460.026466.00.00LOTINTERM.13 3/81219.017 1/21226.00.00LOTINTERM.9 5/82439.012 1/42445.00.00LOTOPEN HOLE3383.08 1/23383.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1790.0060.011.0seawt/lign4660.0042.011.0seawt/lign12250.0037.010.0seawt/lign24440.0047.09.0seawt/lign33830.0048.013.0seawt/lign