6506/9-4 S
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General information
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Wellbore history
GeneralWell 6506/9-4 S was drilled appraise the 6506/9-2 S Fogelberg discovery. The Fogelberg discovery is located on a small fault block on the Halten Terrace, north-northwest of the Smørbukk Field and northeast of the Morvin Field. The primary objective was to reduce the volume uncertainties of the discovery by establishing the hydrocarbon contacts within the Garn and Ile Formations, verifying reservoir quality, and collecting representative fluid samples.Operations and resultsA 9 7/8" pilot hole was drilled to 1381 m in order to check for shallow gas. No shallow gas was encountered.Appraisal well 6506/9-4 S was spudded with the semi-submersible installation Island Innovator on 3 February 2018 and drilled to TD at 4738 m in the Early Jurassic Tofte Formation. Low penetration rate was experienced in the Lange Formation shales in the 12 ¼” section. After logging at final TD liner was run to perform a DST. The liner hanger running tool stuck in cement, leading to a significant period of NPT. The well was drilled with seawater and hi-vis pills down to 1381 m and with RheGuard Prime oil-based mud from 1381 m to TD.The Garn formation was encountered at 4520 m (4405 m TVD), 14 m shallower than prognosis and the top Ile Formation was picked at 4591.5 m (4475.0 m TVD), 13 m shallower than the prognosis. Approximately 67 m gross of gas bearing sandstone was proven in the Garn Formation whilst 70 m gross of sandstone with high water saturation was encountered in the Ile Formation. The gas-water contact(s) was not observed in the well. The reservoir quality of the Garn formation is variable, ranging from moderate to high, in line with the previous understanding of the reservoir. The reservoir quality of the Ile Formation is poor in the well.There were no reliable oil shows above the OBM in the well. Elevated resistivity and gas readings in the Cretaceous Intra-Lange and Lysing formation sandstones indicate some HC saturation, possibly with a small pocket of live hydrocarbons in Lysing. The intra-Lange sandstones were seen in the intervals 4031 to 4110 m and 4174 to 4244 m. All three Cretaceous intervals were however considered tight without flow potential.Four successive cores were cut from 4520 to 4618.8 m in the Garn, Not and Ile formations. Core recoveries varied from 96 to 104%. MDT fluid samples were taken at 4532.8 m (condensate and gas), 4553 m (condensate and gas) and 4568.7 m (hydrocarbons).The well was permanently abandoned on 27 April as a gas appraisal 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]1390.004738.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14520.04546.0[m ]24546.14584.7[m ]34584.94590.5[m ]44590.74618.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]98.4Cores 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 availableMDT0.000.00YESMDT4325.004290.00YES -
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 7/81381.00.00INTERM.142284.017 1/22290.00.002293.00.01.96LOTLINER9 7/84463.012 1/44465.02.18LOTOPEN HOLE4738.08 1/24738.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DEN NEU SPGR MAGRES44504740FTNG SAMP44504550HXPT PP44504740LWD - DI331397LWD - GR RES PWD DI NEU DEN CAL45004738LWD - GR RES PWD DI SON3312290LWD - GR RES PWD DI SON NEU DEN22904519MDT SAT SAMP44504600MDT SAT SAMP45684569RES IMG SON GR44504740SEIS VSI44734482 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3313311465189518952042204221242164216424092579317931793246403141104174424443394387438743894520452045884592466246624720 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3511.0310.0Hivis Bentonite Sweeps3971.0310.0Hivis Bentonite Mud3971.3432.0Glydril8171.0310.0Hivis Bentonite Sweeps11981.0310.0Hivis Bentonite Mud13611.3419.0Glydril13811.021.0Glydril13811.0310.0Bentonite13851.3932.0OBM17101.5942.0Rheguard Prime21191.5946.0OBM23601.6949.0OBM31391.6947.0OBM36211.8064.0OBM44191.7753.0OBM44651.8055.0OBM45471.7752.0OBM47381.6441.0OBM47381.8060.0OBM