30/8-2
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General information
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Wellbore history
GeneralWell 30/8-2 was drilled in the Viking Graben of the North Sea, about mid-way between the Hild and the Oseberg Sør Fields. The objective was to test the hydrocarbon potential of the Tertiary X1 prospect. The main target was a prognosed Heimdal Formation sand within the Lista Formation. Planned TD was at 2404 m in the uppermost Cretaceous.Operations and resultsWildcat well 30/8-2 was spudded with the semi-submersible installation West Vanguard on 15 December 1995 and drilled to TD at 2405 m in the Late Cretaceous Jorsalfare Formation. Indications of shallow gas was observed as low gamma and high resistivity in a thin sand layer at 386 m. No significant problems were encountered in the operations. The well was drilled with spud mud down to 1542 m and with KCl/polymer mud from 1542 m to TD.The prognosed Heimdal Formation was not present in the well but a sandstone rich interval assigned to the Hermod Formation was encountered. In the Hermod Formation, a total of 31 m net reservoir sand was calculated between 2075.5 m and 2137.5 m. A Petroleum Geochemistry Study of the reservoir interval indicated significant amounts of migrated hydrocarbons in the Hermod Formation. Traces of migrated hydrocarbons were detected also in thinner sands in the Balder and Våle Formations. The reservoir properties were excellent. An average porosity of approximately 30% has been calculated based on petrophysical evaluation. Permeabilities greater than 3500 mD are measured from core plugs. The hydrocarbon saturation is low and no evidence for moveable hydrocarbons was found in the log data. Fair to weak shows were recorded on cuttings from sandstones and limestone stringers from Top Balder Formation to TD, and good oil shows were recorded on sandstones in the cores.The interval 2129 m - 2152 m was cored (2 cores). The cores cover the lowermost part of the Hermod Formation, basal Sele Formation, and the upper part of the Lista Formation. An MDT fluid sampling at 2123.0 m recovered 9.7 l water/mud filtrate and some gas. No oil was recovered.The well was permanently abandoned on 14 January 1996 as a well with shows.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]1550.002405.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12129.02133.6[m ]22135.02151.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]21.3Cores 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 typeCONDUCTOR30181.036182.00.00LOTSURF.COND.13 3/81534.017 1/21542.00.00LOTOPEN HOLE2129.012 1/42129.00.00LOTOPEN HOLE2405.08 1/22405.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR16042392DLL MSFL DSI NGT D SP AMS15342399FMS LDL CNL GR CAL AMS15352403MDT GR AMS20192352VELOCITY8802400 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1216008008188189221110119614851757199919992055207621382149232023612361 -
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]pdf9.81 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1821.05water based8571.08water based13251.42water based15421.20water based15951.4224.0water based20691.4226.0water based21291.4225.0water based21511.4224.0water based24051.4223.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1580.0[m]DCSTRAT1604.0[m]SWCSTRAT1640.0[m]DCSTRAT1659.0[m]SWCSTRAT1680.0[m]DCSTRAT1690.0[m]DCSTRAT1710.0[m]DCSTRAT1720.0[m]DCSTRAT1750.0[m]DCSTRAT1770.0[m]DCSTRAT1810.0[m]DCSTRAT1823.0[m]SWCSTRAT1860.0[m]DCSTRAT1887.0[m]SWCSTRAT1910.0[m]DCSTRAT1930.0[m]SWCSTRAT1950.0[m]DCSTRAT1970.0[m]DCSTRAT2007.0[m]SWCSTRAT2019.0[m]SWCSTRAT2035.0[m]DCSTRAT2040.0[m]DCSTRAT2048.0[m]SWCSTRAT2055.0[m]DCSTRAT2063.0[m]SWCSTRAT2075.0[m]DCSTRAT2088.0[m]SWCSTRAT2105.0[m]DCSTRAT2110.0[m]DCSTRAT2115.0[m]DCSTRAT2120.0[m]DCSTRAT2125.0[m]DCSTRAT2131.0[m]CSTRAT2132.0[m]CSTRAT2136.0[m]CSTRAT2137.0[m]CSTRAT2140.0[m]CSTRAT2143.0[m]CSTRAT2144.0[m]CSTRAT2145.0[m]CSTRAT2146.0[m]CSTRAT2149.0[m]CSTRAT2151.0[m]CSTRAT2160.0[m]DCSTRAT2170.0[m]DCSTRAT2208.0[m]SWCSTRAT2225.0[m]DCSTRAT2240.0[m]DCSTRAT2255.0[m]DCSTRAT2270.0[m]DCSTRAT2285.0[m]DCSTRAT2290.0[m]DCSTRAT2295.0[m]DCSTRAT2300.0[m]DCSTRAT2315.0[m]DCSTRAT2338.0[m]SWCSTRAT2352.0[m]SWCSTRAT2357.0[m]SWCSTRAT2367.0[m]SWCSTRAT2382.0[m]SWCSTRAT2395.0[m]DCSTRAT2405.0[m]DCSTRAT