25/11-28
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General information
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Wellbore history
GeneralWell 25/11-28 was drilled on the Utsira High ca 13 kilometres south of the Grane field in the North Sea. The objective of the well was to prove petroleum in Late Jurassic Intra Draupne Formation sandstone (Gasol prospect) and in the Permian Rotliegendes Group (Gretel prospect).Operations and resultsWildcat well 25/11-28 was spudded with the semi-submersible installation Songa Trym on 7 September 2015 and drilled to TD at 2590 m in Basement rock. No significant problem was encountered in the operations. The well was drilled with seawater down to 565 m, with Glydril mud from 565 m to 1687 m and with EMS 4400 oil based mud from 1687 m to TD.The well encountered reservoir sandstones within the Viking Group, the Statfjord Group, the Triassic Hegre Group, and the Rotliegendes Group. The well penetrated basement rock (granite) at TD. Reservoir sandstones were found within the Draupne Formation, Statfjord Group and Hegre Group. All these reservoirs were water bearing. The Permian Rotliegendes Group, consisting of mainly conglomerates proved to be tight with poor reservoir quality. Pressure data showed two or three water gradients in the Statfjord Group. The lower pressured gradients were recorded in the upper part; above ca 2027 m, while the highest pressured Statfjord Gradient was below ca 2027 m. Moderate quality pressure points in the Intra Draupne sandstone and in the Hegre Group indicated higher pressures above and below the Statfjord Group. No oil shows were recorded in any section of the well.One core was cut from 1992 to 2046.6 m in the Intra Draupne Formation sandstone and in the Statfjord Group with 100% recovery. No fluid sample was taken.The well was permanently abandoned on 25 September 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]570.002856.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11992.02046.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]54.6Cores 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 typeCONDUCTOR30193.036193.00.00INTERM.13 3/8560.217 1/2565.00.00LINER9 5/81685.512 1/41687.01.51FITOPEN HOLE2590.08 1/22590.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR VSI41612588GR XLROCK16872588MWD - ARC9 TELE5651687MWD - ARCRES6 TELE16872590MWD - ARCVRES9 TELE193565PEX AIT XPT MSIP16902588 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit143143739790790863102510751105152016481764176417791824191719251925195219601960197519841984200520052147214722292574 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1931.3515.0Glydril1931.0516.0Spud Mud1931.6018.0Kill fluid2911.0516.0Spud Mud5651.3012.0Glydril5651.3515.0Glydril5681.3013.0Glydril11791.3015.0Glydril16781.2818.0EMS 440016861.3217.0Glydril16861.3015.0Glydril18181.2816.0EMS 440020471.2819.0EMS 440022951.2823.0EMS 440025901.2823.0EMS 4400 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory570.0[m]DCCGG600.0[m]DCCGG630.0[m]DCCGG660.0[m]DCCGG690.0[m]DCCGG720.0[m]DCCGG810.0[m]DCCGG840.0[m]DCCGG900.0[m]DCCGG980.0[m]DCCGG1050.0[m]DCCGG1070.0[m]DCCGG1110.0[m]DCCGG1140.0[m]DCCGG1170.0[m]DCCGG1200.0[m]DCCGG1230.0[m]DCCGG1260.0[m]DCCGG1290.0[m]DCCGG1330.0[m]DCCGG1350.0[m]DCCGG1380.0[m]DCCGG1410.0[m]DCCGG1450.0[m]DCCGG1470.0[m]DCCGG1500.0[m]DCCGG1570.0[m]DCCGG1600.0[m]DCCGG1630.0[m]DCCGG1660.0[m]DCCGG1690.0[m]DCCGG1720.0[m]DCCGG1740.0[m]DCCGG1750.0[m]DCCGG1770.0[m]DCCGG1780.0[m]DCCGG1790.0[m]DCCGG1800.0[m]DCCGG1820.0[m]DCCGG1840.0[m]DCCGG1860.0[m]DCCGG1870.0[m]DCCGG1910.0[m]DCCGG1923.0[m]DCCGG1935.0[m]DCCGG1947.0[m]DCCGG1959.0[m]DCCGG1971.0[m]DCCGG1977.0[m]DCCGG1980.0[m]DCCGG1986.0[m]DCCGG1988.0[m]SWCCGG1989.0[m]DCCGG1992.0[m]CCGG1995.0[m]CCGG1999.0[m]CCGG2000.8[m]CCGG2002.0[m]CCGG2004.6[m]CCGG2005.0[m]CCGG2006.0[m]CCGG2009.2[m]CCGG2011.0[m]CCGG2013.6[m]CCGG2018.0[m]CCGG2021.0[m]CCGG2024.1[m]CCGG2027.0[m]CCGG2030.7[m]CCGG2035.0[m]CCGG2036.9[m]CCGG2041.0[m]CCGG2045.0[m]CCGG2045.7[m]CCGG2052.0[m]DCCGG2062.0[m]SWCCGG2067.0[m]SWCCGG2082.0[m]DCCGG2109.0[m]DCCGG2115.0[m]SWCCGG2119.0[m]SWCCGG2124.0[m]DCCGG2130.4[m]SWCCGG2136.0[m]DCCGG2160.0[m]DCCGG2166.0[m]DCCGG2184.0[m]DCCGG2196.0[m]DCCGG2202.0[m]DCCGG2208.0[m]DCCGG