7221/4-1
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General information
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Wellbore history
GeneralWell 7221/4-1 was drilled to test the Polmak prospect on the Loppa High in the Barents Sea. The primary objective was to test the reservoir properties and hydrocarbon potential of sandstone in the Early Triassic Kobbe Formation, Polmak prospect. The hydrocarbon potential in the Anarjok prospect in the lower Havert Formation, and the reservoir properties in the Permian Røye Formation were secondary objectives.Operations and resultsWildcat well 7221/4-1 was spudded with the semi-submersible installation West Bollsta on 10 October 2020 and drilled to TD at 1570 m in the Late Permian Røye Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 470 m and with Hydraglide water-based mud from 470 m to TD.The target Polmak sandstone was penetrated from 1355.7 to 1364 m and had indications of hydrocarbons as described below. No reservoir rocks were encountered in the secondary targets.Weak shows, very slow streaming blue, fluorescent cut, were recorded at 910 and 970 m. At 110 m weak yellowish green crush cut fluorescence and weak residual ring was observed. The cored sandstone in the main target had shows in the form of faint hydrocarbon odour, patchy dull yellow direct fluorescence, fast cloudy bright yellow to blue cut fluorescence, bright white cut fluorescence residue, no visible cut. At 1407 and 1434 m very slow cloudy weak yellowishto green cut fluorescence with dull blue to white residue ring was recorded.Twenty-two meters of core was cut in two consecutive cores in the interval 1359 to 1381 at the Polmak target level in the Kobbe Formation. An ORA wire line fluid sample was obtained at 1357.2 m. The sample contained mud-contaminated water.The well was permanently abandoned on 1 December 2022 as a dry well with shows.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]480.001569.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11359.01368.9[m ]21368.91381.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]22.0Cores 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 typeCONDUCTOR30470.136470.10.00INTERM.20602.526608.01.51FITINTERM.9 5/81281.59 7/81281.51.53LOTOPEN HOLE1286.512 1/41286.50.00OPEN HOLE1570.08 1/21570.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]FMI MSIP12811570MWD - GR RES DIR PWD SON DEN CAL12811570MWD - GR RES DIR PWD SON DEN NEU6021277MWD - PWD DIR403456MWD - PWD DIR470588MWD - PWD RES GR DIR SON469603NEXT PEX HRLA HNGS12811570ORA13561365 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit403494494504504882135613561356141814351459156415651565 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4501.031.01.0Sea Water4501.188.020.0Hydraglide Optima4671.051.01.0Bentonite Spud Mud5001.2112.024.0Hydraglide Optima5141.3921.029.0Hydraglide5271.149.020.0Hydraglyde Optima5411.3921.028.0Hydraglide5471.2212.024.0Hydraglide Optima5781.3919.013.8Hydraglide6081.2017.029.5Hydraglyde6081.031.01.0Seawater6081.3921.039.0HydraGlyde10701.2014.022.0Hydraglyde Optima12771.1814.024.0Hydraglyde Optima12801.2015.026.0Hydraglyde Optima12871.2214.027.0Hydraglyde Optima15661.1814.023.0Other15701.1814.023.0Other