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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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 -
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 -
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 -
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 -
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 -
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 -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.22