30/3-9
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General information
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Wellbore history
GeneralThe purpose of well 30/3-9 was to prove minimum economical volumes of hydrocarbons in the Brent Group within the C-prospect, and to possibly identify a down flank hydrocarbon/water contact within the Brent Group. The C-prospect is situated within an easterly dipping terrace, north of the Oseberg platform. The 30/3-9 well was the first well drilled on this structural segment.Operations and resultsWildcat well 30/3-9 was spudded on 24 April 2000 with the semi-submersible installation "West Alpha" and drilled to a total depth of 4015 m in the Early Jurassic Drake Formation. No shallow gas was encountered. The well was drilled with seawater with hi-vis pills and bentonite mud down to 1027 m, and with KCl/polymer/glycol mud ("Glydril" with 3.5 % glycol) from 1027 m to 2466 m. The well was then displaced to oil based "VersaPro" mud and drilled with this mud through the 12 1/4" section to 3712 m. Circulation was lost at 3644 m and 294 m3 "VersaPro" was lost to the formation. The 8 1/2" section (3712 m to TD) was drilled with KCl/polymer/glycol mud ("Glydril" with 2.5 % glycol). Thin gas-charged stringers were encountered at 2113 m (sandstone in the Lista Formation), 2526 m and 2541 m (limestone in the Jorsalfare Formation). The reservoir of the Brent Group was expected to comprise a complete set of formations. However, only the Ness and Oseberg Formations were conclusively present. The absence of the Tarbert Formation is due to erosion. From the image log (FMI), a fault zone was recognized within the Brent Group in the interval between 3900 m and 3909 m. The absence of the Etive/Rannoch Formations (and possibly, the upper part of the Oseberg Formation) is due to faulting. It is possible that the uppermost 3 m of the 19 m thick lower sand (from 3904 to 3907 m) in the reservoir represents the Etive Formation. However, this is not conclusive and the sands are thus assigned to the Oseberg Formation in this report.The uppermost sandstone layer in the Ness Formation, from 3815 m to 3819 m, contained gas/condensate. This was confirmed by MDT sampling. The remaining sandstones in Ness/Oseberg Formations were water wet. MDT fluid sampling gave water in the Oseberg Formation (3909.3 m), water in the Ness Formation (3838.5 m), and gas/condensate in the Ness Formation (3816.0 m). One core was cut from 3899 m in the Ness Formation. The core jammed after 1 m. 30/3-9 was permanently abandoned on July 1 2000 as a gas/condensate discovery.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]1040.004015.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13899.03900.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]1.0Cores 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 availableDST0.000.00CONDENSATEYES -
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 typeCONDUCTOR30201.036201.00.00LOTINTERM.201019.0261019.01.60LOTINTERM.13 3/82452.017 1/22454.01.91LOTINTERM.9 5/83707.012 1/43707.02.05LOTOPEN HOLE4015.08 1/24015.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DITE DSI LDT ACTS GR24523719DLT MSFL LDT CNT GR37124023DSI CSI (VSP) GR18163925DSI LDL LEH QT GR10202459FMI GR36873949MDT GR38093919MSCT GR38073925MWD - ARC37124015MWD - CDR2033712VSP18604000 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit141747930161316411968196820452065222822282550323634603469361936193632363737183718373538153815390439233923 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.54 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.45 -
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].PDF64.73.PDF52.50 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1801.03DUMMY7301.6015.0GLYDRILL7371.8222.0GLYDRILL7481.6016.0GLYDRILL9051.8223.0GLYDRILL9501.8225.0GLYDRILL10271.20DUMMY13281.2412.0GLYDRILL18791.4518.0GLYDRILL21131.6026.0GLYDRILL21231.6024.0GLYDRILL21591.5819.0GLYDRILL24601.6024.0GLYDRILL24631.6121.0GLYDRILL25421.7550.0VERSAPRO25421.7850.0VERSAPRO28851.7550.0VERSAPRO34381.7851.0VERSAPRO34571.7850.0VERSAPRO35361.8153.0VERSAPRO37071.8248.0VERSAPRO37121.8248.0VERSAPRO37181.8926.0VERSAPRO38081.9131.0GLYDRILL38101.9126.0GLYDRILL38991.9128.0GLYDRILL39091.9132.0GLYDRILL39261.9129.0GLYDRILL39751.9130.0GLYDRILL40151.9128.0GLYDRILL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3807.0[m]SWCWESTLB3807.0[m]SWCWESTLB3813.0[m]SWCWESTLB3824.0[m]SWCWESTLB3925.0[m]SWCWESTLB