8/10-5 S
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General information
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Wellbore history
GeneralWell 8/10-5 S was drilled to test the Butch East prospect on the Sørvestlandet High in the North Sea. The Butch structure is defined as a salt diapir induced ovoid structure. The primary objective was to evaluate the presence of hydrocarbons in the Late Jurassic Ula Formation of the Butch East segment and thereby evaluate the upside potential for the entire Butch prospect. If the well proved dry, or if it encountered an ODT situation, a sidetrack was planned to establish the OWC.Operations and resultsWildcat well 8/10-5 S was spudded with the jack-up installation Mærsk Giant on 4 January 2014 and drilled to TD at 2925 m (2791 m TVD) in the Permian Zechstein Group. The well was drilled vertical down to 1550 m and deviated from there, with a sail angle of ca 27.5 ° from ca 1920 m to TD. This was done to avoid potential shallow gas between 450 and 700 m, and to intersect moderately dipping strata at reservoir level at an angle close to perpendicular. No significant problem was encountered in the operations. The well was drilled with bentonite mud down to 430 m, with Glydril mud from 430 m to 749 m and with Versatec oil based mud from 749 m to TD.The target Ula Formation was encountered at 2708 m (2602.8 m TVD). The Ula Formation and overlying Farsund Formation siltstone were both found to be water wet. No oil shows above the OBM were described in the well. Minor amounts of wet gas was recorded in the Nordland Group between 636 to 700 m.Two conventional cores were cut continuously from 2672.34 m (top Farsund Formation) to 2769.75 m (uppermost Skagerrak Formation). Water samples were taken at 2724 m.The well was plugged back for sidetracking on 4 March 2014. It is classified as dry.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]440.002925.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12672.32725.2[m ]22725.52770.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]97.6Cores 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 typeCONDUCTOR30181.036182.00.00SURF.COND.20428.026430.00.00LINER16738.020746.01.75FITINTERM.13 3/81900.017 1/21912.01.91LOTINTERM.9 5/82660.012 1/42665.00.00OPEN HOLE2925.08 1/22925.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT PEX EDTC LEHQT02885IS PPC MSIP EDTC PPC GR01914LWD-GR RES APWD DIR SON DEN NEU7372672LWD-GR RES APWD SON26652919LWD-GR RES APWD SON DIR181734MDT26752804NGI PPC MSIP PPC EDTC26552885USIT CBL VDL16301880USIT CBL VDL18002200ZVSP VSI414132804 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1101101148114817151715173518191949195219522009214123512351237624382473264926492671270827082760276027912810 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4301.1913.0Bentonite mud4301.235.0Bentonite mud7491.3420.0VERSATEC OBM7491.3923.0VERSATEC OBM7491.4937.0Versatec OBM8321.5040.0Versatec OBM16441.5944.0Versatec OBM19121.4936.0Versatec OBM19121.5946.0Versatec OBM20711.4631.0Versatec OBM20711.5233.0Versatec OBM25111.5941.0VERSATEC OBM25111.5540.0VERSATEC OBM26651.5636.0Versatec OBM27251.5331.0VERSATEC OBM27251.5331.0VERSATEC OBM29251.5336.0VERSATEC OBM