34/5-2 S
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General information
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Wellbore history
GeneralWell 34/5-2 S was drilled to test the Tyttebær prospect on Tampen Spur, 8 km south-west of the Knarr discovery in the northern North Sea. The primary objective was to test the hydrocarbon potential in the Early Jurassic Cook Formation.Operations and resultsWildcat well 34/5-2 S was spudded with the semi-submersible installation Scarabeo 8 on 31 May 2018 and drilled to TD at 3711 m in the Early Jurassic Amundsen Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis sweeps down to 1070 m, with KCl/GEM/polymer mud from 1070 m to 2133 m, and with Enviromul oil-based mud from 2133 m to TD.The Cook Formation was penetrated from 3588 to 3674 m and consisted of fine to very fine-grained sandstone and siltstone. About 50 metres of Cook was reservoir sandstone with generally poor to moderate reservoir quality. Shows (fluorescence and cut) were observed in the Cook Formation, but post-well geochemical analyses indicated the fluorescence to come from the oil-based mud used in the well. The overlying Drake Formation is indicated by kerogen analysis to have source rock quality. Vitrinite reflectance in Drake is around 0.8%Ro, i.e. oil-window maturity.No cores were cut. No fluid sample was taken.The well was permanently abandoned on 4 July 2018 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]1080.003711.00 -
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 typeCONDUCTOR36498.042498.00.00SURF.COND.201063.7261070.01.56LOTINTERM.13 5/82121.817 1/22133.01.81LOTINTERM.9 7/83491.012 1/43493.02.03LOTOPEN HOLE3711.08 1/23711.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MWD - DIR FTPWD GR RES SON DEN N34933711MWD - DIR HO0498MWD - DIR PWD4981070MWD - DIR PWD GR RES SON10702133MWD - DIR PWD GR RES SON GP21333493 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit421130814251906190619401954204920492307328534723472348134813499349935883674 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4471.03Seawater4601.50Fresh Water Bentonite4701.50Kill Mud4801.04Fresh Water Bentonite10701.03Seawater10701.50Kill mud10701.04Sweeps10731.37KCl/Polymer/GEM WBM20071.41KCl/Polymer/GEM21331.41KCl/Polymer/GEM21331.46Oil Based24001.50Oil Based31011.50Oil Based31951.03Seawater32001.03Seawater32001.00Oil Based34261.55Oil Based34521.81Oil Based34931.55Oil Based35151.81Oil Based37111.81Oil Based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3496.0[m]DCPETROSTR3499.0[m]DCPETROS3502.0[m]DCPETROS3505.0[m]DCPETROS3508.0[m]DCPETROS3511.0[m]DCPETROS3514.0[m]DCPETROS3517.0[m]DCPETROS3520.0[m]DCPETROS3523.0[m]DCPETROS3526.0[m]DCPETROS3529.0[m]DCPETROS3532.0[m]DCPETROS3535.0[m]DCPETROS3538.0[m]DCPETROS3541.0[m]DCPETROS3544.0[m]DCPETROS3547.0[m]DCPETROS3550.0[m]DCPETROS3553.0[m]DCPETROS3556.0[m]DCPETROS3559.0[m]DCPETROS3562.0[m]DCPETROS3565.0[m]DCPETROS3568.0[m]DCPETROS3571.0[m]DCPETROS3574.0[m]DCPETROS3577.0[m]DCPETROS3580.0[m]DCPETROS3583.0[m]DCPETROS3586.0[m]DCPETROS3589.0[m]DCPETROS3592.0[m]DCPETROS3595.0[m]DCPETROS3598.0[m]DCPETROS3601.0[m]DCPETROS3604.0[m]DCPETROS3607.0[m]DCPETROS3610.0[m]DCPETROS3613.0[m]DCPETROS3616.0[m]DCPETROS3619.0[m]DCPETROS3622.0[m]DCPETROS3625.0[m]DCPETROS3628.0[m]DCPETROS3634.0[m]DCPETROS3637.0[m]DCPETROS3640.0[m]DCPETROS3643.0[m]DCPETROS3646.0[m]DCPETROS3649.0[m]DCPETROS3652.0[m]DCPETROS3655.0[m]DCPETROS3658.0[m]DCPETROS3661.0[m]DCPETROS3664.0[m]DCPETROS3667.0[m]DCPETROS3670.0[m]DCPETROS3673.0[m]DCPETROS3676.0[m]DCPETROS3679.0[m]DCPETROS3682.0[m]DCPETROS3685.0[m]DCPETROS3688.0[m]DCPETROS3691.0[m]DCPETROS3694.0[m]DCPETROS3697.0[m]DCPETROS3700.0[m]DCPETROS3703.0[m]DCPETROS3706.0[m]DCPETROS3709.0[m]DCPETROS3711.0[m]DCPETROS