33/6-3 S
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General information
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Wellbore history
GeneralWell 33/6-3 S was drilled in the Marulk Basin in the Northern North Sea in order to test the extension of the 34/4-10 oil discovery across a saddle point to a structural high in the south-west. The objective was to evaluate sandstones in the Statfjord Formation, the Beta Statfjord South prospect. The well was planned as a near-HPHT well.Operations and resultsAppraisal well 33/6-3 S was spudded with the semi-submersible installation Songa Delta on 17 April 2012 and drilled to TD at 4444 m (4200 m TVD) 65 m into the Late Triassic Lunde Formation. The well was drilled directionally (S-shaped well with a sail angle through the 12 1/4” interval (2496 to 4015 m) of approximately 38.5 deg. The well was drilled with seawater down to 1364 m, with Carbo-Sea oil based mud from 1364 m to 2496.5 m, and with Magma-Teq oil based mud from 2496.5 m to TD.Top of the Statfjord Formation (primary target) was penetrated at 4266 m (4023 m TVD), 6m TVD shallower than prognosis. The Lunde Formation (Hegre Group) was recorded at 4379 m (4135.2 m TVD). The petrophysical interpretation of the logging data recorded a gross Statfjord Formation reservoir of 112.5 m with 35.9 m net water bearing reservoir (average porosity of 13.0% and average SW of 96.7%). The only shows recorded in the well were poor oil shows in cuttings and two sidewall cores, all in the Statfjord Formation sandstones from 4230 m to 4376 m. Formation pressure and temperature data confirmed the central fault terrace was not in the HPHT regime and that it was in a lower pressure regime to the 34/4-11 and 34/4-13S fault terraces.No conventional cores were cut in the well. Six RCI formation fluid samples were acquired at the top of the Statfjord Formation (at 4299 m); all were confirmed by laboratory analysis to be formation water.The well was permanently abandoned on 24 July 2012 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]1370.004444.00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3611117130117201720175618171890189021593320394939753975407040804084408441144154415441984230426742674285433243774377 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]HDIL 6CAL XMAC DSL38004434HDIL 6CAL XMAC ORIT ZDL CN DSL..34004009MRCH TTRM JAR SWVL DSL 6CAL OR..34354185MWD - DI3611364MWD - GR ECD RES DI DENS CAL NEU43064444MWD - GR RES PWD DI3611363MWD - GR RES PWD DI41844306MWD - GR RES PWD DI SON13642497MWD - NB GR RES PWD GR DI SON24974184PCOR42604390RCI42684375RCI42704300SBT PMFC3203948VSP15154324 -
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 typeCONDUCTOR30439.036440.00.00SURF.COND.201358.0261364.01.77LOTPILOT HOLE1363.09 7/81363.00.00INTERM.13 3/82484.017 1/22497.01.84LOTINTERM.9 7/84006.012 1/44015.02.12LOTLINER74181.08 1/24184.02.10LOTOPEN HOLE4444.064444.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4391.05Spud Mud7501.7442.0CarboSea OBM13631.4951.0Spud Mud14941.5332.0CarboSea OBM24961.4426.0CarboSea OBM31071.7139.0CarboSea OBM34881.8534.0MagmaTEQ OBM39961.9939.0MagmaTEQ OBM40151.8939.0MagmaTEQ OBM40151.7438.0CarboSea OBM41641.9738.0MagmaTEQ OBM41841.8437.0MagmaTEQ OBM43061.9439.0MagmaTEQ OBM44441.8632.0MagmaTEQ OBM