1/5-5
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General information
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Wellbore history
GeneralWell 1/5-5 was drilled to test the Solaris prospect in the Central Graben, about 40 km North-West of the Ekofisk field, close to the border between UK and Norway. The primary target was to prove reservoir and hydrocarbon presence in Late Jurassic reservoir sands of the Ula Formation. Secondary target was the Triassic Skagerrak Formation.Operations and resultsWildcat well 1/5-5 was spudded with the jack-up installation Mærsk Gallant on 24 February 2016 and drilled to TD at 5942 m in the Middle - Late Vestland Group. A pilot hole was drilled from 210 to 1140 m to check for shallow gas, but no gas was seen and the opening up and continuation of the well could be carried out. The well is a deep high temperature-high pressure well. Thirty-nine days were counted as NPT. The single main cause of NPT (11 days) was main rig maintenance and changing the drilling line after installing BOP at 1140 m. Otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1140 m, with NABM oil based mud from 1140 m to TD.The primary target Ula Formation sandstone was encountered at 5831 m. The Ula Formation was 80 m thick and consisted mainly of sandstones and a few siltstones. The reservoir showed traces of gas and wireline logging was carried out for further classification. The logging proved the reservoir tight, of moderate to poor quality, and dry. There were no shows above the oil-based mud. As the primary reservoir was found dry, it was decided not to continue to the secondary, Triassic target.No cores were cut. No fluid sample was taken.The well was permanently abandoned on 16 September 2016 as a dry well.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]1143.005942.00 -
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 typeCONDUCTOR30200.036210.00.00SURF.COND.201129.0261140.01.74LOTPILOT HOLE1140.09 7/81140.00.00INTERM.13 5/84201.0164217.02.06FITINTERM.9 7/85551.012 1/45565.02.25LOTOPEN HOLE5942.08 1/25942.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GYRO1205535HAPS HLDS HNGS GR55515925IBC CBL VDL GR11304171IBC CBL VDL GR41805544LWD - BITGR GR RES PWD DI31053477LWD - DI118210LWD - DI APWD2101143LWD - DI GR RES APWD SON2101140LWD - GR RES PWD DI11433105LWD - GR RES PWD DI34774217LWD - NBGR RES GR PWD DI42185561LWD - PWD55655566LWD - RES GR PWD DI55665942PPC DSI GR24005556QAIT PPC DSI55515937XPT GR58105872 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit11818923209320932423268345934833483359441265228523953855385545955295540571257125752583158315911 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2001.0515.0Sea water2001.2523.0Spud Mud2421.2514.0Spud mud3011.0517.0Spud Mud3011.3217.0Spud mud7001.7030.0EMS-47507251.2517.0Spud mud7801.031.0Sea water8271.0515.0Spud mud11301.2311.0Silicate11401.2213.0Silicate11401.0515.0Spud Mud11431.6444.0EMS-460015441.6753.0EMS-460017851.8858.0EMS-475018431.6750.0EMS-460023121.6845.0EMS-460032161.8855.0EMS-475033071.6841.0EMS-460034581.7041.0EMS-460040451.8855.0EMS-475041001.7042.0EMS-460041801.8859.0EMS-475042111.7041.0EMS-460042901.8881.0EMS-440043301.7041.0EMS-475045171.7243.0EMS-475046341.7444.0EMS-475047871.7846.0EMS-475049331.8244.0EMS-475049422.1888.0EMS-440049941.8548.0EMS-475051001.8854.0EMS-475051581.8546.0EMS-475052741.8970.0EMS-475053311.8547.0EMS-475053922.1891.0EMS-440054191.8848.0EMS-475055602.1890.0EMS-440055611.8853.0EMS-475055822.1047.0EMS-440058692.1260.0EMS-440059422.1893.0EMS-440059422.1472.0EMS-4400