6507/2-4
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General information
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Wellbore history
GeneralWell 6507/2-4 was drilled on the Marulk structure on the Dønna Terrace in the Norwegian Sea. The main purpose was to appraise the Lysing Formation discovery in the previous well 6507/2-2, and to confirm the reserves down flank. Lange Formation (Intra Lange sandstones UL2 and UL1) was the secondary target. Planned TD was set 50 m into the Jurassic.Operations and resultsAppraisal well 6507/2-4 was spudded with the semi-submersible installation West Alpha on 17 November 2007 and drilled to TD at 3600 m in the Early Cretaceous Lyr Formation. Operations proceeded without really serious problems, but in the 12 1/4" and 8 1/2" sections a considerable amount of time was NPT due bad weather conditions and hole instability with tendency of stuck BHA. Due to very low rate of penetration it was agreed among the License Partners to set TD in the Cretaceous Lyr Formation. The well was drilled with sea water and hi-vis sweeps down to 1350 m and with Ultradril mud from 1350 m to TD.All stratigraphic tops were encountered generally 10-27 meters higher than expected; Lysing formation was found 10.4 m higher than prognosed, UL2 sandstone 14.5 m deepest and UL1sandstone was hit 19 m higher. The primary target Lysing sandstone was found at 2832 m and was found Gas/Condensate bearing all through down to a GDT at 2853 m. Unit UL2 was found water bearing at 3331.5 m, composed by many sand layers interbedded with claystone. Unit UL1 was found at oil bearing at 3378.5 m, consisting in one sand body 3 meters thick. Oil shows and gas peaks were recorded in numerous thin sandstone stringers in the Lange Formation between 3320 m and 3465 m.One core was cut from 2835 to 2852 m in the Lysing Formation, and two cores were cut in the interval 3334 to 3344.8 m in the Lange Formation. MDT gas/condensate samples were taken at 2838 m and 2850 m in the Lysing Formation, water was sampled in the intra-Lange Formation UL2 level at 3337 m, and oil in the intra-Lange Formation UL1 level at 3380.5 m.The well was permanently abandoned on 19 February 2008 as a gas/condensate 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]1360.003600.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12835.02852.0[m ]23334.03342.3[m ]33342.33344.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]27.8Cores 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 availableDST0.000.00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38313751800180018521852196419642456283228322853333233783552 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR XPT GR32913600CMR XPT GR ACTS27552971FMI MSIP GR PPC ACTS22473071MDT MINI DST28382850MDT MINI DST33373380MSCT32963480MSIP FMI GR12003597MWD - ARCGR ARCRES DIR13102260MWD - ARCGR ARCRES DIR SON4471310MWD - GR383447MWD - RAB GR RES BIT RES GDIR EC30743600MWD - RAB GR RES BIT RES GEODIR22603074PEX ECS HRLA GR22473074PEX ECS HRLA GR ACTS28193584VSP14403550 -
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 typeCONDUCTOR30443.036445.00.00LOTSURF.COND.201343.0261355.01.73LOTINTERM.13 3/82247.017 1/22263.01.85LOTINTERM.9 5/83065.012 1/43080.01.93LOTOPEN HOLE3600.08 1/23600.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4461.30SPUD MUD5181.05SPUD MUD5471.05SPUD MUD10891.05SPUD MUD13501.30120.0SPUD MUD14001.2515.0ULTRADRIL DW20701.5535.0ULTRADRIL DW22601.5531.0ULTRADRIL DW25911.4829.0ULTRADRIL DW27221.4830.0ULTRADRIL DW27561.4828.0ULTRADRIL DW27721.4827.0ULTRADRIL DW28341.48310.0ULTRADRIL DW29541.4831.0ULTRADRIL DW30511.4933.0ULTRADRIL DW30741.4929.0ULTRADRIL DW30841.5232.0ULTRADRIL DW31701.5632.0ULTRADRIL DW32251.6238.0ULTRADRIL DW32371.6337.0ULTRADRIL DW32571.6637.0ULTRADRIL DW32861.6733.0ULTRADRIL DW33341.7341.0ULTRADRIL DW34001.7337.0ULTRADRIL DW36001.5228.0ULTRADRIL DW36011.7339.0ULTRADRIL DW -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2836.00[m ]2837.00[m ]2839.50[m ]2842.50[m ]2844.45[m ]2846.50[m ]2849.75[m ]3334.60[m ]3336.05[m ]3339.50[m ]3340.05[m ]3340.45[m ]3340.57[m ]3340.90[m ] -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.28