25/11-26
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General information
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Wellbore history
GeneralWell 25/11-26 was drilled on the Utsira High in the North Sea ca 1 km northwest of the Grane Field. The main objective of well 25/11-26 was to prove commercial hydrocarbons in the Eocene Odin sandstone Member of the Nanna prospect, and determine whether this reservoir was in communication with the Grane Field. The secondary objective was to validate the seismic AVO anomaly of the Nanna prospect, and thereby provide means of de-risking other Odin sandstone prospects within the licence. A third objective was to prove commercial hydrocarbons in Late Jurassic Intra Draupne Formation Sandstones of the Leviathan prospect.Operations and resultsWell 25/11-26 was spudded with the semi-submersible installation Ocean Vanguard on 16 January 2013 and drilled to TD at 2235 m in the Early Jurassic Statfjord Group. No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis sweeps down to 1099 m and with XP-07 oil based mud from 1099 m to TD.No hydrocarbons were shown in any of the prospects. The gas readings were very low throughout the whole well. There was no sign of the Odin sandstone in the Balder Formation resulting in no oil or gas shows. The Draupne Formation consisted of claystone with minor limestone stringers and only a thin stringer of tight sandstone, no hydrocarbons were seen.No cores were cut. No fluid samples were taken.The well was permanently abandoned on 17 February 2013 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]1100.002235.00 -
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 typeCONDUCTOR30201.036207.00.00SURF.COND.13 3/81086.017 1/21099.01.61LOTOPEN HOLE2235.012 1/42235.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT MSIP PEX GR10852235MWD - ARCVRES9 TELE10841099MWD - PP152207MWD - PPX5 ARCVRES9 PP2071084VSP ZO GR1832225 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1528531037112011341747174717651769183818421842190219301961202020202052208421312131216421672184 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured10801.2822.0XP-07 - Yellow20801.2818.0XP-07 - Yellow22351.2820.0XP-07 - Yellow22351.2820.0XP-07 - Yellow -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1100.0[m]DCROBERTSO1120.0[m]DCROBERT1140.0[m]DCROBERT1160.0[m]DCROBERT1180.0[m]DCROBERT1190.0[m]DCROBERT1200.0[m]DCROBERT1220.0[m]DCROBERT1240.0[m]DCROBERT1250.0[m]DCROBERT1270.0[m]DCROBERT1370.0[m]DCROBERT1440.0[m]DCROBERT1450.0[m]DCROBERT1460.0[m]DCROBERT1470.0[m]DCROBERT1480.0[m]DCROBERT1490.0[m]DCROBERT1510.0[m]DCROBERT1530.0[m]DCROBERT1550.0[m]DCROBERT1570.0[m]DCROBERT1590.0[m]DCROBERT1620.0[m]DCROBERT1640.0[m]DCROBERT1660.0[m]DCROBERT1670.0[m]DCROBERT1680.0[m]DCROBERT1686.0[m]DCROBERT1692.0[m]DCROBERT1698.0[m]DCROBERT1707.0[m]DCROBERT1713.0[m]DCROBERT1719.0[m]DCROBERT1725.0[m]DCROBERT1731.0[m]DCROBERT1734.0[m]DCROBERT1737.0[m]DCROBERT1743.0[m]DCROBERT1746.0[m]DCROBERT1749.0[m]DCROBERT1755.0[m]DCROBERT1761.0[m]DCROBERT1764.0[m]DCROBERT1767.0[m]DCROBERT1770.0[m]DCROBERT1773.0[m]DCROBERT1776.0[m]DCROBERT1779.0[m]DCROBERT1785.0[m]DCROBERT1791.0[m]DCROBERT1797.0[m]DCROBERT1809.0[m]DCROBERT1836.0[m]DCROBERT1940.0[m]DCROBERT1960.0[m]DCROBERT1970.0[m]DCROBERT1990.0[m]DCROBERT2070.0[m]DCROBERT2080.0[m]DCROBERT2090.0[m]DCROBERT2093.0[m]DCROBERT2099.0[m]DCROBERT2102.0[m]DCROBERT2108.0[m]DCROBERT2114.0[m]DCROBERT2120.0[m]DCROBERT2126.0[m]DCROBERT2129.0[m]DCROBERT2135.0[m]DCROBERT2141.0[m]DCROBERT2147.0[m]DCROBERT2153.0[m]DCROBERT2159.0[m]DCROBERT2162.0[m]DCROBERT2165.0[m]DCROBERT2171.0[m]DCROBERT2177.0[m]DCROBERT2186.0[m]DCROBERT2207.0[m]DCROBERT2216.0[m]DCROBERT2225.0[m]DCROBERT2235.0[m]DCROBERT