35/10-2
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General information
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Wellbore history
GeneralWildcat well 35/10-2 is located on the Flatfisk Slope approximately mid-way between the Fram and the Kvitebj ørn Discoveries in the Northern North Sea. The primary objective for the well was to explore the hydrocarbon potential of the Middle Jurassic Brent reservoir. The secondary objective was to explore the hydrocarbon potential of the Paleocene sandstones of the Goliath -prospect. Furthermore, the well would test the reservoir potential of the "intra Dunlin" (Cook Formation) and Statfjord sandstones. Planned TD was 5000 m MSL.Operations and resultsWell 35/10-2 was spudded with the semi-submersible installation Transocean Arctic on 16 April 1996. The original well path, 35/10-2, was drilled down to a total depth of 3301 m, where the mud motor parted. A technical sidetrack, named 35/10-2 T2 was necessary. This was kicked off at 2563 and the well was drilled down to TD for the well at 4677 m in the Early Jurassic Statfjord Formation. In the 8 3/8" section, severe problems were encountered due to mud losses. The hole was cemented back once to try and seal off the loss zones. The well was drilled with bentonite down to 1460 m, with ANCO 2000 mud from 1460 m to 3990 m, and with AncoTherm mud from 3990 m to TDNo reservoir quality sandstones of any thickness were found in the Tertiary. The seismic anomaly thought to represent the Goliath prospect, was in fact caused by a sequence of thin siltstones and very fine sandstones at 1953-1955 m in the Sele Formation. Good oil shows were observed in this interval. The top of the Brent Group was penetrated at 4149 m, almost 90 m higher than prognosed, and the reservoir proved to hold a gas column of approximately 72 m. The well penetrated sandstones in the Early Jurassic, (Cook, Amundsen and Statfjord Formations), but no hydrocarbons were observed in these. Due to this the well was not drilled to the planned TD.Nine conventional cores were cut in the well. Two of these were cut from 1960 m to 1974.5 m in the Lista Formation, one was cut from 2018 m to 2023.5 m in the Lista Formation, and the remaining 6 were cut from 4154 m to 4240 m in the Brent Group. FMT samples were taken in the Ness Formation at 4217.9 m (one sample: mix of mud filtrate and formation water) and at 4199.3 m (three samples: mainly mud filtrate with 1 litre gas in one of the samples).The well was permanently abandoned on 22 August 1996 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]1470.004677.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11960.01966.5[m ]21966.51974.0[m ]32018.02023.0[m ]44154.04162.3[m ]54162.34169.3[m ]64169.54184.6[m ]74185.54206.2[m ]84207.04223.2[m ]94224.04238.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]100.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30482.036484.00.00LOTSURF.COND.201452.0261455.01.69LOTINTERM.13 3/83437.017 1/23438.01.86LOTINTERM.9 7/83978.012 1/43978.02.04LOTOPEN HOLE4677.08 3/84677.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DIPL MAC GR36024501DLL MAC CNL ZDL SL14523450DLL ZDL GR34373990DPIL MAC GR42364663FMT QDYNE GR20152016FMT QDYNE GR41484154FMT QDYNE GR41504473FMT QDYNE GR41504473FMT QDYNE GR41990FMT QDYNE GR41990FMT QDYNE GR PT41574636FMT QDYNE GR PT43954663MAC GR33753990MDT GR43954485MWD - DPR4834579SWC GR19502034SWC GR34743821SWC GR38233985SWC GR39854322SWC GR39894632SWC GR43174672VSP GR6403440VSP GR33204420ZDL CNL GR39254501ZDL CNL GR44654677 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit397903946125818741874193419632086210621062355341436453698369837953820392139214018414941494183424542804319435343534368445044714601 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf3.29 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf26.32 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4831.03DUMMY10501.03DUMMY14391.03DUMMY17521.45ANCO 200020181.4720.0ANCO 200021561.4720.0ANCO 200025811.4930.0ANCO 200027731.4936.0ANCO 200030261.4928.0ANCO 200032011.4929.0ANCO 200033011.4721.0ANCO 200033011.4730.0ANCO 200034501.5132.0ANCO 200034501.5132.0ANCO 200039581.7036.0ANCO 200039901.8143.0ANCO 200040971.8933.0ANCO 200041421.8426.0ANCO 200041491.8128.0ANCO 200041541.8422.0ANCO 200042331.8425.0ANCO 200045051.8428.0ANCO 200045381.8125.0ANCO 200046771.8119.0ANCOTEMP/BENT. -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1470.0[m]DCGEOCH1490.0[m]DCGEOCH1510.0[m]DCGEOCH1530.0[m]DCGEOCH1550.0[m]DCGEOCH1570.0[m]DCGEOCH1590.0[m]DCGEOCH1610.0[m]DCGEOCH1630.0[m]DCGEOCH1650.0[m]DCGEOCH1670.0[m]DCGEOCH1690.0[m]DCGEOCH1710.0[m]DCGEOCH1730.0[m]DCGEOCH1750.0[m]DCGEOCH1770.0[m]DCGEOCH1780.0[m]DCGEOCH1794.0[m]DCGEOCH1806.0[m]DCGEOCH1821.0[m]DCGEOCH1836.0[m]DCGEOCH1845.0[m]DCGEOCH1860.0[m]DCGEOCH1875.0[m]DCGEOCH1887.0[m]DCGEOCH1896.0[m]DCGEOCH1905.0[m]DCGEOCH1914.0[m]DCGEOCH1923.0[m]DCGEOCH1932.0[m]DCGEOCH1941.0[m]DCGEOCH1950.0[m]DCGEOCH1959.0[m]DCGEOCH1968.0[m]DCGEOCH1977.0[m]DCGEOCH1986.0[m]DCGEOCH1995.0[m]DCGEOCH2004.0[m]DCGEOCH2013.0[m]DCGEOCH2025.0[m]DCGEOCH2034.0[m]DCGEOCH2043.0[m]DCGEOCH2052.0[m]DCGEOCH2064.0[m]DCGEOCH2073.0[m]DCGEOCH2082.0[m]DCGEOCH2091.0[m]DCGEOCH2100.0[m]DCGEOCH2115.0[m]DCGEOCH2130.0[m]DCGEOCH2150.0[m]DCGEOCH2170.0[m]DCGEOCH2190.0[m]DCGEOCH2210.0[m]DCGEOCH2230.0[m]DCGEOCH2250.0[m]DCGEOCH2270.0[m]DCGEOCH2290.0[m]DCGEOCH2310.0[m]DCGEOCH2330.0[m]DCGEOCH2350.0[m]DCGEOCH2370.0[m]DCGEOCH2390.0[m]DCGEOCH2410.0[m]DCGEOCH2430.0[m]DCGEOCH2450.0[m]DCGEOCH2470.0[m]DCGEOCH2490.0[m]DCGEOCH2510.0[m]DCGEOCH2530.0[m]DCGEOCH2550.0[m]DCGEOCH2570.0[m]DCGEOCH2590.0[m]DCGEOCH2610.0[m]DCGEOCH2630.0[m]DCGEOCH2650.0[m]DCGEOCH2670.0[m]DCGEOCH2690.0[m]DCGEOCH -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4235.70[m ]4227.50[m ]4225.25[m ]4220.76[m ]4216.35[m ]4207.85[m ]4179.87[m ]4164.74[m ]4157.80[m ]4156.20[m ]