8/10-4 S
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General information
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Wellbore history
GeneralWell 8/10-4 S was drilled on the Butch prospect, a salt-induced structure on the Sørvestlandet high, approximately 13 km SE of the Ula Field in the North Sea. The objective of the well was to test the hydrocarbon potential of the Late Jurassic Ula Formation, the main prospective formation in the area.Operations and resultsWell 8/10-4 S was spudded with the jack-up installation Mærsk Guardian on 15 August 2011 and drilled to TD at 3071 m (3058 m TVD) in the Late Permian Zechstein Group. The well was drilled as an 'S' shaped profile to avoid a potential faulted zone in the shallow sediments, identified during the site survey. A 9 7/8" pilot hole was drilled from 227 m to 1011 m to check for shallow gas. No shallow gas was seen. No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis sweeps down to 1011 m and with oil based mud from 1011 m to TD.The Ula Formation came in at 2947 m and was filled with oil all through down to its base at 3003 m. No OWC was found, instead the Ula reservoir was penetrated in an oil-down-to setting. Drilling continued through the Skagerrak Formation and was terminated after anhydrite was identified in cuttings returns, indicating that the Zechstein Group had been penetrated. Indications of hydrocarbons were observed only in the Ula Formation, which represents the only reservoir interval in the well.A total of three cores were taken in the 6" hole from 2928 m to 3028 m with 100% recovery. The third core confirmed the presence of the Skagerrak Formation. RDT wire line samples were taken at 2950 m and at 2973.5 m with oil at both levels.The well was plugged back and prepared for sidetrack to well 8/10-4 A on 27 October 2011. It is classified as an oil Discovery.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]230.003072.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12958.02985.0[m ]22985.03003.8[m ]33004.03027.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]69.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableRFT0.000.00YESRFT2973.502950.00OIL21.10.2011 - 15:00YES -
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 typeCONDUCTOR30218.636222.00.00LOTSURF.COND.13 3/81001.017 1/21008.00.00LOTPILOT HOLE1011.09 7/81011.00.00LOTINTERM.9 5/82523.012 1/42531.00.00LOTLINER72896.08 1/22898.00.00LOTOPEN HOLE3071.063071.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL CAST17502450GTET DSN SDL ICT IDT WSTT ARCT253065MWD - GR RES DEN SON DIR PWD30283071MWD - GR RES SON DIR PWD25312958RDT GR29193002VSP6003050 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit11013802258225822862304246924862493249325412655273227322746275727632887288729052948294830043058 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2261.2410.0Kill / displacement mud9891.5939.0ENVIROMUL10111.5939.0Enviromul20221.4429.0ENVIROMUL25491.4913.4ENVIROMUL25491.5150.0ENVIROMUL25491.4445.0ENVIROMUL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2884.0[m]DCPETROSTR2890.0[m]DCPETROS2896.0[m]DCPETROS2904.0[m]DCPETROS2910.0[m]DCPETROS2916.0[m]DCPETROS2925.0[m]DCPETROS2931.0[m]DCPETROS2937.0[m]DCPETROS2943.0[m]DCPETROS2949.0[m]DCPETROS2955.0[m]DCPETROS2958.2[m]CPETROS2961.0[m]DCPETROS2965.8[m]CPETROS2967.0[m]DCPETROS2988.8[m]CPETROS2990.1[m]CPETROS2991.0[m]DCPETROS2999.2[m]CPETROS3000.6[m]CPETROS3002.3[m]CPETROS3004.0[m]DCPETROS3004.8[m]CPETROS3005.2[m]CPETROS3008.7[m]CPETROS3009.0[m]DCPETROS3009.8[m]CPETROS3012.6[m]CPETROS3015.4[m]CPETROS3017.1[m]CPETROS3017.1[m]CPETROS3018.2[m]CPETROS3019.4[m]CPETROS3023.0[m]CPETROS3027.3[m]CPETROS