15/8-2
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General information
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Wellbore history
GeneralThe 15/8-2 well was drilled in the Ve sub-basin, west of the Sleipner Field and ca 3 km from the UK border in the North Sea. The primary objective was to prove a commercial hydrocarbon accumulation within Upper and Lower Hugin Formation. The secondary objectives were to test possible hydrocarbon presence within the Sleipner Formation and leads in the Hod Formation (Goldfinger lead) and Late Jurassic.Operations and resultsWell 15/8-2 was spudded with the semi-submersible installation COSLPioneer on 20 August 2011 and drilled to TD at 4386 m in the Middle Jurassic Sleipner Formation. Before spud, a shallow gas class 1 warning was given. A 9 7/8" pilot hole was drilled from 208.5 to 1100 m. However, no shallow gas was observed by the ROV at the wellhead or by the MWD during drilling. No significant problem was encountered in the operations. The well was drilled with Seawater and bentonite hi-vis sweeps down to 1133 m, with Glydril mud from 1133 m to 2419 m, and with Versatec OBM from 2419 m to TD.The well penetrated rocks of Quaternary, Tertiary, Cretaceous, and Jurassic age. No hydrocarbon indications were observed in the Hod Formation (Goldfinger) and only thin sandstone stringers were observed in the Late Jurassic. The main target Upper Hugin Formation was encountered at 3881.5 m, 31 m higher than prognosed, and the Lower Hugin Formation came in at 4065 m, 1 m shallower than prognosed. The secondary target Sleipner Formation was encountered at 4238 m, i.e. 61 m deeper than prognosed. No movable hydrocarbons were proven in the well.Shows: Bright yellowish direct fluorescence, and a slow streaming cloudy bluish white cut fluorescence was recorded in siltstones in the Draupne Formation in the interval from 3812 m to 3818 m and Heather Formation from 3845 m to 3857 m. In the Hugin Formation sandstones questionable shows (oil-based mud?) were recorded in the intervals from 3881 m to 3911 m and 4013m to 4120m.No cores were cut. The MDT tool was run for pressure and fluid sampling. Four water samples were taken at 4011 m.The well was permanently abandoned on 21 October 2011 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]1140.004385.00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit14487810271898231223542399243227642848284829043114338134323558355835803643376337633839388238824238 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DSI PEX GR37084381MDT GR38884363MDT GR39123913MWD - ARC PP24193706MWD - ARC TELE2081133MWD - GVR PERI TELE37064386MWD - LWD - ARC PP2081100MWD - PD ARC PP11332419MWD - TELE DIR144208USIT CBL GR31103708VSP GR1954350 -
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 typeCONDUCTOR30204.536209.00.00LOTPILOT HOLE1100.09 7/81100.00.00LOTSURF.COND.201127.7261133.01.44LOTINTERM.13 3/82409.817 1/22419.01.72LOTINTERM.9 5/83708.012 1/43708.01.55LOTOPEN HOLE4386.08 1/24386.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured11331.3514.0Spud Mud11361.2212.0Glydril12151.2213.0Glydril18201.2213.0Glydril23791.329.0Glydril24191.3518.0Glydril29851.3031.0Versatec31881.3030.0Versatec32361.3032.0Versatec36501.3034.0Versatec37061.3030.0Versatec38491.4140.0Versatec43401.4135.0Versatec43861.4132.0Versatec