7121/1-2 S
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General information
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Wellbore history
GeneralWell 7121/1-2 S was drilled to test the Setter and Pointer prospects in the Hammerfest Basin of the Barents Sea. The primary objective was to test the reservoir properties and hydrocarbon potential of the Early Cretaceous Kolmule (Setter prospect) and Knurr (Pointer prospect) formations. The secondary objective was to test the presence and reservoir properties of the Middle Jurassic Stø Formation.Operations and resultsWildcat well 7121/1-2 S was spudded with the semi-submersible installation Leiv Eiriksson on 6 January 2019 and drilled to TD at 3375 m (3360 m TVD) m in the Middle Jurassic Stø Formation. A 9 7/8” pilot hole was drilled from 410 to 806 m. No shallow gas was observed. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 808 m and with High Performance water-based mud with 3.5 – 5% glycol from 808 m to TD.The well proved reservoir from 2109 m 2149 m (2093.8 to 2133.8 m TVD) at base Kolmule Formation, but the sandstones were water wet with only weak shows (weak cut and residue fluorescence). Reservoir was also proved in the Knurr Formation with main sands in the interval ca 2794 to 2890 m (2779 to 2875 m TVD). The Knurr Formation sandstones had fair to good oil shows with weak odour, direct fluorescence and cut and residue fluorescence, and oil was sampled in the upper part of the sandiest interval. The Knurr sands were however generally tight due to extensive cementation. Sandstone stringers/sandstones without hydrocarbon shows were encountered in the Hekkingen Formation and in the Stø Formation.Two cores were cut. Core 1 was cut from 2795 to 2819.1 m with 99% recovery. The core-log depth shift for this core is 2.46 m. Core 2 was cut from 2826 to 2853 m with 98.3% recovery. The core-log depth shift for this core is 2.94 m. MDT fluid samples were taken at 2133.92 m (water), 2792.49 m (oil), 2872.78 m (water), 2893.60 m (water), and 2915.00 m (water).The well was permanently abandoned on 1 March 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]810.003375.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12795.02818.9[m ]22826.02852.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]50.4Cores 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 typeCONDUCTOR30406.836407.10.00SURF.COND.20800.726808.01.30LOTPILOT HOLE806.09 7/8806.00.00INTERM.9 5/82009.212 1/42017.01.58LOTOPEN HOLE3375.08 1/23375.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]FMI MSIP27003370FMI MSIP GR3402798HRLA NEXT PEX HNGS23763378HRLA NEXT PEX HNGS XPT00MDT21332794MDT27892825MDT28723360MWD - GR PWD RES DIR AC407806MWD - GR RES PWD NEU DEN CAL AC20173375MWD - PWD GR DIR340808MWD- GR RES PWD DIR AC8132017VSP5303370XL ROCK20333374 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3404434431200120020722072214927333061328533433343 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3811.0520.0Bentonite Spud Mud3811.5010.0KCL/Gem4071.0529.0Bentonite Spud Mud4071.5010.0KCL/Gem5501.0534.0Bentonite Spud Mud5501.3912.0DISPLACEMENT MUD6151.031.0Sea water7301.2015.0HP WBM7951.0534.0Bentonite Spud Mud7951.3912.0DISPLACEMENT MUD8081.0534.0Bentonite Spud Mud8131.2021.0HP WBM17501.2421.0HP WBM20001.2016.0HP WBM20091.2422.0HP WBM20171.2415.0HP WBM20221.2415.0HP WBM28191.2418.0HP WBM33751.2422.0HP WBM