6407/5-2 S
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General information
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Wellbore history
GeneralWell 6407/5-2 S was drilled on the eastern side of the Gimsan Basin on the Halten Terrace in the Norwegian Sea. Nearest discoveries are the Mikkel Sør gas wells, 2-3 km to the east. The main objective of the well was to drill and evaluate the Late Cretaceous Lysing Formation in the Chamonix Prospect. The deeper Jurassic reservoirs of the Garn, Ile, Tofte and Tilje Formations were seen as secondary targets.Operations and resultsDue to presence of cold water corals and sponges in the region, identified during the site survey, the spud location for Chamonix was moved 500m SE from its original planned position. This prevented any negative effects on the cold-water corals and sponges during anchor laying and drilling operations. In order to penetrate all targets vertically, the well was drilled with an S-shaped trajectory.Wildcat well 6407/5-2 S was spudded with the semi-submersible installation Borgland Dolphin on 28 July 2011 and drilled to TD at 3545 m in the Early Jurassic Tilje Formation. Due to potential shallow gas a 9 7/8" pilot hole was drilled from 332 m to 545 m. No shallow gas was observed. No significant problem was encountered in the operations. The well was drilled with spud mud down to 545 m and with Carbo-Sea synthetic oil-based mud from 545 m to TD.No movable hydrocarbons were discovered in the prognosed Late Cretaceous Lysing Formation. Post-well biostratigraphic evaluation of the well assigned these sand intervals to the Lange Sandstone Member. A non commercial gas discovery was made in Jurassic sandstones where a ca 40 m gross gas column was penetrated from top Rogn Formation at 3109.5 m (2986.4 m TVD), through a thin Melke Formation sandstone and into the Garn Formation. No gas/water contact was established. The only shows that could be distinguished from the oil based mud were seen in the Rogn Formation.One core was cut from 2844 to 2871 m in the Lange Formation. RCI wire line fluid samples were taken at 3114.9 m (gas/condensate), 3135.2 m (gas/condensate), 3141.3 m (gas/condensate), and at 3155.3 m (water).The well was permanently abandoned on 4 September 2011 as a minor 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]550.003554.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12844.02871.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]27.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30326.036326.00.00LOTSURF.COND.20509.026545.01.37LOTPILOT HOLE545.09 7/8545.00.00LOTINTERM.13 3/81186.017 1/21192.01.80LOTINTERM.9 5/82760.012 1/42780.01.90LOTOPEN HOLE3545.08 1/23545.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]EARTH IMAGER27603510LWD - GR RES DIR PWD261330LWD - GR RES DIR SON DEN PWD11922780LWD - GR RES DIR SON DEN PWD NEU27803345LWD - GR RES DIR SON PWD4951192LWD- DIR GR255479MREX GR28203520RCI GR31133500VSP10653465 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2612611152133613361995199520822217221723102400277027703054305431093116314131413250328033403340336734363498 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2611.05Spud mud5451.05Spud mud5581.2120.0Carbo-sea OBM25801.5738.0Carbo-sea OBM27801.5733.0Carbo-sea OBM31391.3922.0Carbo-sea OBM35451.5732.0Carbo-sea OBM35451.3924.0Carbo-sea OBM -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3050.0[m]DCPETROSTR3056.0[m]DCPETROS3062.0[m]DCPETROS3068.0[m]DCPETROS3074.0[m]DCPETROS3080.0[m]DCPETROS3086.0[m]DCPETROS3092.0[m]DCPETROS3098.0[m]DCPETROS3104.0[m]DCPETROS3107.0[m]DCPETROS3110.0[m]DCPETROS3113.0[m]DCPETROS3116.0[m]DCPETROS3125.0[m]DCPETROS3128.0[m]DCPETROS