6506/9-4 A
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General information
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Wellbore history
GeneralWell 6506/9-4 A is a geological side-track to well 6506/9-4 S, drilled on The Fogelberg Discovery on a small fault block on the Halten Terrace, north-northwest of the Smørbukk Field and northeast of the Morvin Field. The side-track was drilled up-flank to the crestal part of the structure where future production wells would be located. The primary objective of the side-track was to perform a DST and collect representative fluid samples.Operations and resultsAppraisal well 6506/9-4 A was kicked off in 14” casing at 2201 m on 28 April 2018. It was drilled with the semi-submersible installation Island Innovator to TD at 4497 m (4458 m TVD) m in the Early Jurassic Tofte Formation. Low penetration rate was experienced in the Lange Formation shales in the 12 ¼” section . The well was drilled with RheGuard Prime oil-based mud from kick-off to TD.The Garn Formation was encountered at 4289.5 m (4254 m TVD), 13.5 m shallower than prognosis and top Ile Formation was picked at 4350.5 m (4313.8 m TVD), 13 m shallower than the prognosis. Approximately 57 m TVD gross sandstone of moderate to high quality was encountered in the Garn Formation and 66 m TVD gross moderate quality sandstone in the Ile Formation. Both formations were gas bearing.Shows in the form of cut fluorescence was observed in several Intra-Lange sandstones, but not significantly different from the fluorescence caused by the oil-based mud.Two cores were cut in succession from 4288.9 to 4341 m in the Garn Formation. The core recovery was 80.04% and 98.38% fore core 1 and 2, respectively. The core-log depth shifts were +1.8m and +1.1 m for core 1 and 2, respectively. No fluid sample was taken on wire line.The well was permanently abandoned on 13 July 2018 as a gas appraisal well.TestingA drill stem test was conducted from the interval 4290.0 - 4325.0 m (4253.4-4287.4 m TVD) in the Garn Formation. Maximum production rate from the formation was 570 000 Sm3 of gas and 80 Sm3 of condensate per day through a 36/64 inches choke opening. The gas contains 6 ppm H2S and 4-5% CO2. The temperature recorded in the test was 153 °C. -
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]2220.004497.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14288.94310.7[m ]24316.24340.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]46.2Cores 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 availableDST0.000.00YESDST4325.004191.60CONDENSATE23.06.2018 - 17:53YESMDT4325.004290.00CONDENSATE23.06.2018 - 17:45YES -
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 typeCONDUCTOR30397.036397.50.00SURF.COND.201374.5261381.01.60LOTPILOT HOLE1381.09 7/81381.00.002201.00.01.93FITINTERM.142284.017 1/22200.00.00INTERM.9 7/84249.012 1/44250.02.10LOTLINER74496.08 1/24497.00.00 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04290432514.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0153Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.080570000 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]APS LDS ADT HNGS CMR31034499IBC CBL PMIT3352188LWD - GR RES PWD DI SON NEU DEN22014497PS LPD XLDP HY PC GR42994399PS XLDP HY PC GR42924296QAIT QGEO PPC MSIP GR31034499 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3313311465189518952042204221242163216324252596320032003228392439744035405341334149414941534290429043474351442044204471 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured22111.6442.0Rheguard25251.6953.0Rheguard34691.7864.0Rheguard35771.7456.0Rheguard37541.7563.0Rheguard39361.7663.0Rheguard41501.7866.0Rheguard42501.7964.0Rheguard42881.7456.0Rheguard43141.7554.0Rheguard44971.7558.0Rheguard44971.7769.0Rheguard44971.14Calcium Chloride Brine44971.7558.0Rheguard44971.5034.0Rheguard OBM44971.296.0WBM44971.02WBM