7/1-1
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General information
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Wellbore history
GeneralWell 7/1-1 was drilled on the J{ren High in the southern part of the North Sea, ca 8 km east of the UK border line.Operations and resultsWildcat well 7/1-1 was spudded with the semi-submersible installation Sedco 135 F on 3 July 1971 and drilled to TD at 2808 m in the Triassic Skagerrak Formation. There were indications of shallow gas at 472 m, otherwise no significant problems were reported from the drilling operations.The well penetrated Quaternary and Tertiary sediments with no significant sand development down to a depth of 2224 m where Cretaceous Chalk of the Tor Formation was encountered. The Cretaceous section continued down to 2661 m where the sandy Triassic Skagerrak Formation was encountered. The well was dry and no shows were reported from the well other than those originating from diesel added to the mud.Two cores were cut, one from 2243.3 to 2261.6 m in the Tor Formation and the other from 2451.2 to 2468.9 m in the Hod Formation. No wire line fluid samples were taken.The well was permanently abandoned on 5 August 1971 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]384.053028.22 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom17360.07385.0[ft ]28042.08100.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]25.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30154.036159.00.00LOTSURF.COND.20367.026381.00.00LOTINTERM.13 3/81571.017 1/21601.00.00LOTOPEN HOLE2808.012 1/42808.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL152367IEL SP3671600SON GR CALI CBL100367TEMP152367 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit116108820852085209821092224222423902634263426612661 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.46 -
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]pdf2.84pdf0.62 -
Documents – Norwegian Offshore Directorate papers
Documents – Norwegian Offshore Directorate papers Document nameDocument formatDocument size [MB]pdf33.18pdf0.49 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1371.13water-based3811.17water-based8561.29water-based14091.46water-based16001.46water-based24511.50water-based28071.48water-based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory5680.0[ft]DCRRI5720.0[ft]DCRRI5760.0[ft]DCRRI5800.0[ft]DCRRI5840.0[ft]DCRRI5880.0[ft]DCRRI5940.0[ft]DCRRI6000.0[ft]DCRRI6060.0[ft]DCRRI6120.0[ft]DCRRI6180.0[ft]DCRRI6240.0[ft]DCRRI6300.0[ft]DCRRI6360.0[ft]DCRRI6420.0[ft]DCRRI6480.0[ft]DCRRI6540.0[ft]DCRRI6600.0[ft]DCRRI6660.0[ft]DCRRI6720.0[ft]DCRRI6780.0[ft]DCRRI6840.0[ft]DCRRI6900.0[ft]DCRRI6960.0[ft]DCRRI7020.0[ft]DCRRI7080.0[ft]DCRRI7140.0[ft]DCRRI7200.0[ft]DCRRI7260.0[ft]DCRRI7320.0[ft]DCRRI