25/11-17
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General information
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Wellbore history
GeneralWell 25/11-17 is located south of the Balder / Grane area. The objective of the well was to test the hydrocarbon potential of sands of both Jurassic and Paleocene age. The location was chosen such that it left minimum reserves up dip in the Jurassic prospect while simultaneously penetrating the Paleocene prospect above the expected regional oil water contact.Operations and resultsExploration well 25/11-17 was spudded with the semi-submersible installation "West Delta" on 1 March 1993 drilled to a total depth of 2256 m, 13 m into metamorphic basement. The well was drilled water based with spud mud down to 1413 m and with KCl / Polymer from 1413 m to TD.Reservoir sands were encountered in the Balder Formation from 1590 m to 1646 m but no shows were seen and the reservoir proved to be water bearing. Reservoir sands were also encountered in the Statfjord Formation from 1998 m to 2038 m but again no shows were seen and the reservoir proved to be water bearing. Overlaying the basement the well penetrated a 10 m thick layer of regolith (weathered rock). Seven conventional cores were cut from 1625.5 m to 1759.6 m, starting in the middle of the Balder Formation, continuing through the Sele, Lista and Våle Formations and ending in the Tor Formation. An eighth core was cut from 2018 m to 2037 m in the lower part of the Statfjord Formation and into the regolith layer, and a final ninth core was cut at TD in the metamorphic basement from 2248 m to 2256 m. No fluid samples were taken. The well was permanently abandoned as a dry well on 22 March 1993.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]1420.002247.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11625.51640.0[m ]21643.01651.6[m ]31654.01660.5[m ]41661.51679.0[m ]51679.61705.0[m ]61706.51732.0[m ]71732.61759.0[m ]82018.02035.9[m ]92248.02255.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]150.1Cores 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 typeCONDUCTOR30237.036237.00.00LOTINTERM.9 5/81398.012 1/41413.01.80LOTOPEN HOLE2256.08 1/22256.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]4-ARM DIP GR13972235CST GR14652222DLL MLL ZDL CN GR SP CHT13972242FMT-HP GR CHT15882129MAC SL CHT13972228MWD - GR RES ROP DIR1682248VSP4402225 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit153777815897897114615871587164716521721174217421847187018821921192119511966198519851997214622332243 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.32 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.70 -
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]pdf15.10 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5781.05WATER BASED14131.05WATER BASED14651.2013.0WATER BASED16141.2819.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1465.0[m]SWCHYDRO1476.0[m]SWCHYDRO1485.0[m]SWCHYDRO1500.0[m]SWCHYDRO1525.0[m]SWCHYDRO1551.0[m]SWCHYDRO1561.0[m]SWCHYDRO1567.0[m]SWCHYDRO1571.0[m]SWCHYDRO1580.0[m]SWCHYDRO1590.0[m]SWCHYDRO1630.2[m]CHYDRO1634.2[m]CHYDRO1637.0[m]CHYDRO1640.0[m]CHYDRO1930.0[m]SWCHYDRO2018.0[m]CHYDRO2022.4[m]CHYDRO2023.7[m]CHYDRO2028.7[m]CHYDRO2035.1[m]CHYDRO2045.0[m]SWCHYDRO2055.0[m]SWCHYDRO2083.0[m]SWCHYDRO2093.0[m]SWCHYDRO