2/6-6 S
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General information
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Wellbore history
GeneralWell 2/6-6 S was drilled to test the Oppdal and Driva prospects the east side of the Mandal High in the North Sea. The primary objectives were to test the oil potential in the Paleocene Oppdal submarine sandstone reservoir (Borr Member), and in the Permian aeolian reservoir (Auk Formation) in the Rotliegend Driva prospect.Operations and resultsA 9 7/8” pilot hole was drilled to 1012 m due to a slight shallow gas warning between 391 m and 494 m. No obvious shallow gas was encountered here, nor below 500 m.Wildcat well 2/6-6 S was spudded with the jack-up installation Rowan Viking on 13 November 2018 and drilled to TD at 3843 m (3628 m TVD) m in the Permian Rotliegend Group. Severe losses were experienced while drilling at 3670 m. The well was drilled with seawater and sweeps down to 1014 m m and with EMS-4600 oil-based mud from 1014 m to TD.The Paleocene Borr Member target (Intra-Våle Formation sandstone) was penetrated from 2908 to 2949 m (2864 to 2898 m TVD). It consisted of sandstone with a layer of claystone close to the top. Three LWD stethoscope pressure points showed a water gradient below the claystone and lack of pressure communication across the claystone. The Borr Member was water bearing. The cored section had weak shows in the form of cut fluorescence and a weak residue, but no direct fluorescence.Three meters of the Kupferschiefer Formation source rock was penetrated from 3677 to 3680 m. Geochemical samples from this unit showed TOC up to 5.8% and a Hydrogen Index of 350 mg HC/g TOC. Vitrinite reflectance and Tmax indicated pre-oil to earliest oil window maturity at this depth.The Permian Auk Formation target (Rotliegend Gp) was penetrated from 3680 to 3808 m (3495 to 3600 m TVD). It was expected as a Sandstone succession, however the cuttings proved to be composed of siltstone with local limestone stringers. Auk had weak shows on sidewall cores from 3788 to 3802 m, described with no direct fluorescence, cut fluorescence and a weak residue.One conventional core was taken in the target Borr sandstone member from 2910 to 2940 m with 100% recovery. No fluid sample was taken.The well was permanently abandoned on 18 January 2019 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]190.003843.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate CommentsB-cutt på plass SS-13-A.Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12910.02940.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]30.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit12212215361536235427972797281528412889290829492949304233503521352135453599367836803680 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT TLD HGNS GR36513838DU OBMI PPC SC GR36513755LWD - DI122184LWD - GR ECD DEN RES NEU DI PR S28093663LWD - GR RES DI122184LWD - GR RES DI184958LWD - GR RES DI NEU DEN SON20022843LWD - GR RES DI SON1841004LWD - GR RES DI SON10092005LWD - GR RES ECD PRES DI36513841MSCT36753833VSI41613575 -
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 typeCONDUCTOR30181.036184.00.00SURF.COND.201009.0261014.01.96FITINTERM.13 3/82002.617 1/22008.01.82FITINTERM.2008.00.00.00INTERM.9 5/82837.612 1/42846.01.90FITLINER73651.08 1/23670.01.67FITOPEN HOLE3843.063843.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1251.03Water1841.20Water1841.39Water4091.20Water7481.03Water9361.12Water10141.45Oil10141.20Water18801.45Oil24631.64Oil24631.45Oil27411.64Oil35511.45Oil36701.47Oil36701.64Oil38431.45Oil -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2910.62[m ]2912.62[m ]2914.33[m ]2915.28[m ]2915.50[m ]2916.30[m ]2917.30[m ]2918.16[m ]2919.30[m ]2919.75[m ]2920.65[m ]2921.25[m ]2922.02[m ]2923.65[m ]2924.50[m ]2925.45[m ]2926.25[m ]2927.50[m ]2928.60[m ]2929.95[m ]2930.50[m ]2931.45[m ]2932.50[m ]2933.50[m ]2934.45[m ]2935.50[m ]2936.50[m ]2937.50[m ]2938.67[m ]2937.70[m ]3677.00[m ]3678.00[m ]3788.00[m ]3796.00[m ]3802.00[m ]3807.00[m ]3809.00[m ]3817.00[m ]3825.10[m ]3833.00[m ]