6507/10-2 S
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General information
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Wellbore history
GeneralWell 6507/10-2 S was drilled to test the Novus prospect on the Halten Terrace, about 13 km south of the Heidrun platform in the Norwegian Sea . The primary exploration target for the well was to prove petroleum in Middle Jurassic reservoir rocks (Garn and Ile formations). The secondary exploration target was to prove petroleum in Lower Jurassic reservoir rocks (Tilje formation).Operations and resultsWildcat well 6507/10-2 S was spudded with the semi-submersible installation West Navigator on 10 November and drilled to TD at 3020 m (2993 m TVD) in the Early Jurassic Åre Formation. A 9 7/8" pilot hole was drilled from 403 to 564 m without any shallow gas observed. The well was drilled S-shaped with kick-off at 1485 m, a sail angle of 15°, and vertical again from ca 2460 m. Drilling commenced in rough weather, leading to 961.75 hrs of WOW (42 % of the total rig time). The well was drilled with seawater and hi-vis pills down to 564 m, with Aquadrill mud from 564 m to 1479 m, and with Carbosea oil based mud from 1475 m to TD.Top of primary target Garn Formation came in at 2655.4 m (2629.2 m TVD) with gas down to the GOC at 2666.5 m (2641.8 m TVD) and oil down to the OWC at 2680.2 m (2654 m TVD) based on MDT pressure gradients and fluid sampling. The reservoir was thicker and with better quality than expected. The other exploration targets in the Ile and Tilje formations were water bearing. No shows were recorded outside of the hydrocarbon bearing Garn Formation.One core was cut from 2657 to 2682 m with 86% recovery. The missing 3.4 m of core was probably left in the hole, as the core was found sitting on top of the catcher when laying down at surface. MDT fluid samples were taken at 2658.5 m (gas), 2671 m (oil), 2674 m (oil), 2681.4 m (water), and at 2699 m (water).The well was permanently abandoned on 11. February as an oil and 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]570.003020.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12657.02678.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]21.6Cores 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 availableMDT2674.000.00OILYES -
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 typeCONDUCTOR30398.042x36403.20.00SURF.COND.20561.026564.00.00INTERM.13 3/81469.017 1/21475.00.00LINER9 5/82577.012 1/42586.01.70FITOPEN HOLE3020.08 1/23020.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT GR26552979MDT GR26992658MWD-DIR GR RES PWD3331475MWD-NB GRRES PWD DIR SON14752586MWD-NBGR RES DEN POR PWD CAL DI25863020PEX ZAIT HNGS25773015PPC MSIP GPIT GR25773022VSI GR15062771VSI GR27713000 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit334334143717601760200820082042210521052196238225302530261326152615261726552655268226952750275028232950 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3571.4922.0Spud kill mud5541.1413.0Aquadrill WBM5641.1640.0Bentonite Hi-Vis5641.4922.0Spud kill mud5831.1318.0Aquadrill WBM10961.1817.0Aquadrill WBM14751.2116.0Aquadrill WBM16941.4928.0OBM24031.6243.0OBM25861.4931.0OBM26811.4930.0OBM27591.4931.0OBM30201.4929.0OBM