6506/11-10
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General information
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Wellbore history
GeneralWell 6506/11-10 was drilled to test the Hades and Iris prospects on the western margin of the Halten Terrace on the eastern flank of the Sklinna Ridge in the Norwegian Sea. The primary objective (Hades) was to test the hydrocarbon potential in Early Cretaceous intra-Lange Formation sandstones (Breiflabb Sandstone Member in the NORLEX stratigraphy). Secondary objective (Iris) was to test the hydrocarbon potential in the Middle Jurassic Garn Formation.Operations and resultsWildcat well 6506/11-10 was spudded with the semi-submersible installation Deepsea Bergen on 28 November 2017. A 36” section was drilled first, followed by a 9 7/8” pilot hole to 1407 m to check for shallow gas. Then the 26” section was drilled before the BOP and riser was installed with 20” casing at 1409 m. Final TD was set at 4536 m in the Early Jurassic Ror Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1428 m, with Glydril mud from 1428 m to 2652 m, and with Rheguard oil-based mud from 2652 m to TD.The primary objective intra-Lange Formation sandstone was penetrated from 3933 to 3976 m. It consists of interlayered sandstones and claystones with an 8 m massive sandstone on top and was found gas-filled from top to a gas-down-to contact at 3968 m. Relatively high resistivities and sampling of water with oil at 3998.3 m indicate some hydrocarbon saturation also below 3968 m. The secondary objective Garn Formation was encountered at 4223 m and was gas-bearing down to a gas-water contact at 4318 m. This reservoir can be divided in two units: an upper fine-grained micaceous and cemented unit and a coarser grained, highly porous and permeable unit below 4292 m. This unit have permeabilities reaching 24 Darcy. Oil shows in the well were weak and questionable due to masking by the oil-based mud.Three cores were cut in the well. Core 1 was cut from 3942 to 3970 m in the intra-Lange sandstone with 92.2% recovery. Core 2 was cut from 4231 to 4246 m in the Garn Formation with 65.4% recovery. Core 3 was cut from 4313 to 4341 m in the Garn Formation with 65.2% recovery. MDT fluid samples were taken at 3940 m (gas), 3944 (gas), 3998.3 m (water with oil), 4051.2 m (water), 4295.7 m (gas), 4305.4 (gas), and at 4380.3 m (water with oil)The well was permanently abandoned on 17 April 2018 as a gas/condensate discovery.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]1435.004537.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13942.03967.8[m ]24231.04240.8[m ]34313.04331.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.9Cores 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 typeCONDUCTOR30431.036431.00.00SURF.COND.201409.0261428.00.00PILOT HOLE1427.09 7/81427.01.71LOTINTERM.13 3/82647.017 1/22652.02.01LOTINTERM.9 7/83810.012 1/43817.02.15FITLINER74163.08 1/24165.02.17FITOPEN HOLE4536.064536.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ECS LDS CMR GR41654530LWD - ABG GT EWR SOL PWD DIR38174230LWD - DGR EWR P4PWD365431LWD - DGR EWR P4PWD DIR4331428LWD - DGR EWR P4XBAT PWD DIR4331427LWD - DGR EWR P4XBAT PWD DIR14282652LWD - DGR SOL EWR P4 ALD CTN PWD42304536LWD - GPDGR EWR SOL ALD CTN XBAT26523817MDT GR38104051MDT GR41634380MSCT GR42244380PPC APS CMR GR38104165PPC MSIP PPC NGIT GR38104165QAIT APS PPC MSIP GR41654538QAIT HLDS ECS GR38104165USIT CBL GR37394154USIT CBL GR38062646VSP GR42174308XLROCK GR39934063 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit365563150319311931206620662092219621962398252732013201327539333976420142234223422542254439447345174517 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4091.4917.0Kill mud9901.3015.0RheGuard10501.5917.0Kill mud10761.6215.0RheGuard10761.3015.0RheGuard13011.5927.0Kill mud14281.027.0Kill mud14281.297.0Kill mud14281.2920.0Spud mud14801.4620.0Glydril20621.6224.0Glydril26521.6224.0Glydril26521.6734.0Rheguard26601.7133.0Rheguard30721.8347.0RheGuard33141.7246.0Rheguard34651.7753.0Rheguard36361.8058.0Rheguard38171.8043.0RheGuard38171.8260.0Rheguard38421.7835.0RheGuard39071.8040.0RheGuard39581.8044.0RheGuard39581.8249.0RheGuard40771.8344.0RheGuard41101.8445.0RheGuard41401.9668.0RheGuard41401.9158.0RheGuard41621.8646.0RheGuard41621.9659.0RheGuard41651.9155.0RheGuard41701.9655.0RheGuard44221.9650.0RheGuard44221.9751.0RheGuard45301.9653.0RheGuard45361.8346.0RheGuard45361.9853.0RheGuard