2/8-14
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General information
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Wellbore history
GeneralWell 2/8-14 was drilled on a complexly faulted anticline situated below the western flank of the Valhall Field (designated as the West Valhall prospect) in the southern North Sea. The primary objective was to test a late Jurassic "wedge" sandstone. The secondary objective was Late Jurassic, Volgian age, sandstones. The well would also determine reservoir quality of the Shetland Group chalk sequences. The planned total depth of the well was 5622 m.Operations and resultsWildcat well 2/8-14 was spudded with the semi-submersible installation West Vanguard on 14 August 1990. No shallow gas zones were penetrated in the well. The well penetrated high pore pressures at 3176 m in the Lower Cretaceous that required plugging back the well and setting an 11 3/4" liner. High pore pressures were again penetrated at 4274 m in the Late Jurassic. Due to well control considerations, the hole was plugged back and sidetracked below approximately 3797 m before setting a 7" liner at 4202 m. Further down high pore pressures again forced a premature end to the well with TD at 4397 m in the Late Jurassic (Late Kimmeridgian) Farsund Formation. The well was drilled with seawater and pre-hydrated bentonite down to 952 m, with KCl/PHPA/Polydrill mud from 952 m to 2560 m, with AncoTemp Polydrill/Ancoresin PHPA from 2560 m to 3855 m, and with AncoTemp Polydrill/Hostadrill PHPA mud from 3855 m to TD.Top Shetland Group Chalk (Tor Formation) was encountered at 2614 m with a 73% mud gas peak and good oil shows. The Tor Formation was 3 m thick and the underlying Hod Formation was 225 m thick. The pressures in the Tor and in the Hod chalk formations were depleted due to production from the Valhall Field as expected. Top Tyne Group, Mandal Formation came in at 3188 m. No significant Volgian age sandstones were penetrated in the well. The primary objective Late Jurassic "Wedge Sandstones" were not penetrated. The well had oil shows of variable quality in all types of lithology virtually all through from 1510 m to TD, except for an interval from 2778 m in the lower Hod Formation to 2929 m in the Sola Formation.No cores were cut and no wire line fluid samples were taken.The well was permanently abandoned on 22 January 1991 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]960.004392.00 -
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 typeCONDUCTOR30185.036193.00.00LOTINTERM.20945.026952.01.74LOTINTERM.13 3/82549.017 1/22560.01.90LOTLINER11 3/43062.0153068.02.05LOTINTERM.9 5/83234.010 5/83248.02.07LOTLINER74202.08 1/24274.02.23LOTOPEN HOLE4392.05 7/84392.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4ARM CAL254930674ARM DIP GR254930774ARM DIP GR30643248ACSIG25502910ACSIG30643248CBL VDL GR4052549CBL VDL GR24143064CBL VDL GR31074206CBL VDL GR32344500COREGUN GR31023245COREGUN GR33004202COREGUN GR34964206COREGUN GR42123295DIFL AC GR CAL30643248DIFL AC SP GR41304396DIFL AC ZDL CN GR25493075DIFL AC ZDL CN SP GR CAL31514207HP FMMT GR42114282HP FMT GR26152690HP FMT GR31013239MWD - DPR EMW RES GR DIR595687MWD - RGD SN RES GR DIR193595MWD - RGD SN RES GR DIR6874274MWD - RGD SN RES GR DIR37974202SWING ARM DIP GR32344208SWING ARM DIP GR42064397VELOCITY26143780VELOCITY41504390VSP25804190ZDL CN GR CAL30643248ZDL CN GR CAL41534396 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit89152225672567257625922614261426172842284728742874290129362984318831893257 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.12pdf20.45 -
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]pdf2.32pdf16.99pdf25.14pdf35.46pdf39.66pdf39.66 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1901.098.0WATER BASED2801.0942.0WATER BASED3301.41WATER BASED5451.0445.0WATER BASED6871.0640.0WATER BASED9591.2010.0WATER BASED11571.2213.0WATER BASED12881.7016.0WATER BASED14101.4921.0WATER BASED16391.6824.0WATER BASED19191.7019.0WATER BASED20351.7018.0WATER BASED23401.7018.0WATER BASED24691.9310.0WATER BASED25601.7315.0WATER BASED27591.6714.0WATER BASED28981.7016.0WATER BASED29841.7316.0WATER BASED30441.7319.0WATER BASED31702.0821.0WATER BASED31761.8620.0WATER BASED31811.9118.0WATER BASED32391.9325.0WATER BASED32481.9324.0WATER BASED32631.9321.0WATER BASED33241.9223.0WATER BASED33741.9224.0WATER BASED34031.9621.0WATER BASED34681.9221.0WATER BASED35541.9624.0WATER BASED36041.9624.0WATER BASED36501.9625.0WATER BASED37211.9624.0WATER BASED37292.0222.0WATER BASED37842.0221.0WATER BASED38101.9626.0WATER BASED38152.0224.0WATER BASED38512.0226.0WATER BASED38751.9824.0WATER BASED38822.0226.0WATER BASED39051.9825.0WATER BASED39062.0226.0WATER BASED39062.0226.0WATER BASED39112.0225.0WATER BASED39871.9824.0WATER BASED40262.0225.0WATER BASED40841.9827.0WATER BASED41342.0224.0WATER BASED41661.9826.0WATER BASED41802.1821.0WATER BASED41882.0219.0WATER BASED42022.0220.0WATER BASED42052.0220.0WATER BASED42492.0820.0WATER BASED42581.9824.0WATER BASED42702.0022.0WATER BASED42742.0221.0WATER BASED43142.0020.0WATER BASED43252.1221.0WATER BASED43262.1222.0WATER BASED43392.1622.0WATER BASED43502.1816.0WATER BASED43922.1620.0WATER BASED