6407/6-7 S
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General information
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Wellbore history
GeneralThe 6407/6-7 S Harepus well was drilled on the eastern limits of the Halten Terrace, adjacent to the Trøndelag Platform offshore Mid Norway. The main objective was to prove hydrocarbon bearing sands in the Middle Jurassic Garn and Ile Formations (Fangst Group). Secondary objectives were to test the hydrocarbon potential of the Ror, Tilje and Åre Formations.Operations and resultsWell 6407/6-U-2 (pilot hole) was spudded and drilled to a total depth of 437 m. A drill break and a drop in gamma measurements indicated a sand layer from 436 - 437 m. Shallow gas was observed at seabed surface by ROV sonar during the connection at 437 m. The well was killed with 1.60 SG kill mud and plugged back to surface with three cement plugs.Wildcat well 6407/6-7 S was spudded with the semi-submersible installation Ocean Vanguard on 12 April 2009 and drilled to TD at 3227 m (3184 m TVD) in the Early Jurassic Åre Formation. The well was designed as a vertical well down to ca 1710 m in the 12 1/4" hole section and directionally drilled from the 12 1/4" section to hit the geological target at a 15 deg angle, holding this inclination to TD. No shallow gas was observed while drilling the 36" and 17 1/2" hole sections. The well was drilled with Seawater and hi-vis sweeps down to 422 m, with 1.15 SG WB spud mud from 422 m to 1149 m, with Performadril HPWBM mud from 1149 m to 2701 m, and with Performadril mud from 2701 m to TD.The well penetrated rocks of Quaternary, Tertiary, Cretaceous, and Jurassic age. TD of the well was in the Åre Formation. Base Cretaceous/Top Spekk Formation was encountered at 2685 m with Late Jurassic Rogn Formation sandstone coming in at 2747 m (2716.2 m TVD) and a second Spekk Formation interval at 2765.7 m (2734.3 m TVD). Eroded Middle Jurassic Garn formation was encountered at 2777.3 m (2745.6 m TVD, 40 m deeper than predicted. Gas with condensate was proved in the Rogn and Garn Formations with a gas down to (GDT) proven in the Garn formation. The Garn formation pressure was 28 bar depleted and the pressure plots could not be used to determine gas-water-contact (GWC). From pressure points and logs gas is seen down to 2813.4 m (2780.6 m TVD) and water up to 2827.2 m (2794.0 m TVD). No hydrocarbons were seen in the Early Jurassic Båt Group.No oil shows were seen in the well apart from some weak cloudy bluish white cut fluorescence, and in parts, a greenish yellow residual in core chips from the reservoir section.One core was cut from 2756.5 to 2778.8 m in the Rogn and Garn Formations. Good quality gas samples were collected with the MDT single probe equipment in the Rogn Formation at 2764 m, 2764.7 m, and 2770.8 m and in the Garn Formation at 2784.1 m. No water samples were collected due to hole conditions.The well was permanently abandoned on 27 May 2009 as a gas 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]430.003222.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12756.52778.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]22.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit26926911141290129018501850194520522052229523672458245826852685274727662777277728112827289328932911299030463179 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]FMI MSIP27003220MDT PRETEST27513139MDT PS PA MINI-DST00MDT PS SAMPLING27642784MWD - PP ARCVRES6 GR RES PWD DIR11493227MWD - PP ARCVRES9 GR RES PW3211149MWD - PP DIR269321PEX HRLA ECS CMR27003227VSP3283220 -
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 typeCONDUCTOR30317.036317.00.00LOTSURF.COND.20418.026422.01.27LOTPILOT HOLE437.09 7/8437.00.00LOTINTERM.13 3/81144.017 1/21149.01.76LOTINTERM.9 5/82700.012 1/42701.01.86LOTOPEN HOLE3227.08 1/23227.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5471.1510.0Spud Mud6491.179.0Spud Mud8501.179.0Spud Mud9651.149.0Spud Mud11491.248.0HPWBM13101.4527.0HPWBM18841.5238.0HPWBM20521.5137.0HPWBM21921.5134.0HPWBM26261.5143.0HPWBM26981.2719.0HPWBM27561.2624.0HPWBM32151.2525.0HPWBM32271.2525.0HPWBM -
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]pdf0.27