25/10-8
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General information
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Wellbore history
GeneralWell 25/10-8 was drilled with "Deep Sea Trym" to test the Hanz prospect with multiple targets. The well found gas and oil in the Upper Jurassic. A sidetrack, 25/10-8 A, was drilled to test the extension of this discovery to the east.Operations and resultsExploration well 25/10-8 was spudded with the semi-submersible installation "Deepsea Trym" 17 February 1997 and drilled to a total depth of 2653 m in the Early Permian Rotliegend Group. Water based mud was used down to 1080 m and an AncoVert oil based mud from 1080 to TD. Well 25/10-8 found the Heimdal Fm to be water wet, the Upper Jurassic sands to contain gas and oil and the Middle Jurassic and Rotliegendes sands to be water wet. A core was cut from 2080 - 2107 m in the Heimdal Formation, a second core was cut from 2518 - 2546 m in Callovian Jurassic to Triassic sediments. After testing the well was plugged back to the 13 3/8" casing on 4 April 1997 as an oil and gas discovery. Sidetrack 25/10-8 A was kicked off from 1067 m and drilled to a total depth of 3460 m (2537 m TVD RKB) in Late Jurassic. An 8 1/2" hole was drilled to core point at 3110 m using oil based mud. Three cores were cut in the Late Jurassic; 3110 to 3147 m, 3147 to 3165 m , and 3165 to 3202 m. No wireline logs were run in well 25/10-8 A, only MWD. No fluid samples were taken. All reservoir sands were found water wet and sidetrack 25/10-8 A was permanently abandoned as a dry well on 27 April 1997.TestingWell 25/10-8 was perforated from 2391.4 - 2398.4 m in the Upper Jurassic. The drill stem test flowed 692 Sm3/D oil of density 0.84 g/cm3 -
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]1090.002652.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12080.02107.9[m ]22518.02546.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]56.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDSTDST12392.002398.0030.03.1997 - 09:20YES -
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 typeCONDUCTOR30201.036201.00.00LOTSURF.COND.13 3/81067.017 1/21080.01.56LOTINTERM.9 5/82249.012 1/42249.00.00LOTLINER72653.08 1/22653.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02392239815.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.024.00025.00094Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.06920.8400.700116 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBIL GR CHT23452650DPR - GR RES DIR67214DPR - GR RES DIR10702066DPR - GR RES DIR22352505DPR - GR RES DIR25052596DPR - GR RES MDL MNP20232235DPR GRC MDL MNP23562639GR CCL22412364HDLL MAC DGR10502649MRIL ZDL CND DSL10652637RCI GR20782629RCI GR21172528RCI GR23722397SWC GR15022598VSP4602650 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit140682794846846102011071232155116131941194119872047207721222204220922092266235423542372245025112511253625772601 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.45 -
Geochemical information
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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]pdf80.09 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2001.75spud mud2001.75low solids10341.75low solids10801.4036.0oil based10811.4036.0oil based10811.74low solids10831.3330.0oil based11841.3232.0oil based14921.3237.0oil based15811.3234.0oil based17701.3235.0oil based18841.3233.0oil based20801.3234.0oil based20921.3232.0oil based21071.3230.0oil based22491.3232.0oil based23601.3232.0oil based25181.3233.0oil based25451.3233.0oil based26101.3230.0oil based26531.3228.0oil based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1400.0[m]DCRRI1420.0[m]DCRRI1430.0[m]DCRRI1440.0[m]DCRRI1450.0[m]DCRRI1460.0[m]DCRRI1470.0[m]DCRRI1480.0[m]DCRRI1490.0[m]DCRRI1500.0[m]DCRRI1510.0[m]DCRRI1520.0[m]DCRRI1530.0[m]DCRRI1540.0[m]DCRRI1550.0[m]DCRRI1560.0[m]DCRRI1580.0[m]DCRRI1600.0[m]DCRRI1610.0[m]DCRRI1620.0[m]DCRRI1630.0[m]DCRRI1640.0[m]DCRRI1650.0[m]DCRRI1660.0[m]DCRRI1670.0[m]DCRRI1680.0[m]DCRRI1690.0[m]DCRRI1700.0[m]DCRRI1710.0[m]DCRRI1720.0[m]DCRRI1730.0[m]DCRRI1750.0[m]DCRRI1760.0[m]DCRRI1770.0[m]DCRRI1780.0[m]DCRRI1790.0[m]DCRRI1800.0[m]DCRRI1810.0[m]DCRRI1820.0[m]DCRRI1830.0[m]DCRRI1840.0[m]DCRRI1850.0[m]DCRRI1860.0[m]DCRRI1870.0[m]DCRRI1880.0[m]DCRRI1890.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCRRI1930.0[m]DCRRI1940.0[m]DCRRI1950.0[m]DCRRI1960.0[m]DCRRI1970.0[m]DCRRI1980.0[m]DCRRI1990.0[m]DCRRI2000.0[m]DCRRI2010.0[m]DCRRI2020.0[m]DCRRI2030.0[m]DCRRI2040.0[m]DCRRI2050.0[m]DCRRI2060.0[m]DCRRI2070.0[m]DCRRI2080.0[m]DCRRI2122.0[m]DCRRI2131.0[m]DCRRI2137.0[m]DCRRI2161.0[m]DCRRI2170.0[m]DCRRI2179.0[m]DCRRI2182.0[m]DCRRI2191.0[m]DCRRI2200.0[m]DCRRI2210.0[m]DCRRI2270.0[m]DCRRI2360.0[m]DCRRI