34/2-2 R
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General information
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Wellbore history
GeneralExploration well 34/2-2 is located a northwestern part of the Tampen Spur area. It was intended to be the first well to test the reflections below the Base Cretaceous (Kimmeridgian) Unconformity on a seismically defined, northerly trending west-northwest dipping fault block. The well was located near the apex of the structure at the Base Cretaceous level, but down-dip with respect to deeper stratigraphy. Primary targets were the Middle Jurassic Brent Formation and the Early Jurassic/Triassic Statfjord Formation. Secondary targets were possible Early Tertiary and Late Jurassic sandstones. Planned TD was 4300 m Sub Sea.Operations and resultsWell 34/2-2 R was spudded with the semi-submersible installation Sedco 703 on 12 December after the first entry 34/2-2 had been abandoned for technical reasons. The well was drilled to TD at 4074 m in the Late Triassic Statfjord Formation, Raude Member. Bad weather conditions during wintertime delayed the drilling progress on many occasions. While drilling the 36" hole section some problems were encountered due to boulder beds. An abnormally high wave hit the rig on 16 January, damaging the living quarters. The rig had to be shut down for repairs for eleven days. Otherwise, drilling of the sedimentary sequence below the 30" casing to TD did not cause major problems. The well was drilled with spud mud/hi-vis pills down to 499 m, with CMC and bentonite from 499 m to 810 m, and with lignosulphonate mud from 810 m to TD.The Brent Formation was not developed in the well and the reservoir conditions in the Statfjord Formations were found to be poorer than expected. No indications of hydrocarbon accumulations were seen. Trace shows were recorded in the Cretaceous in sandstone stringers from 2405 m to 2700 m, in siltstones from 2903 m to 3000 m, and in sandstones from 3200 m to 3282.5 m. From 3282.5 m to 3297.5 m there was a good show in a limestone bed. No oil shows were reported from the Jurassic sequences. The Late Jurassic Draupne Formation was not found in this well and organic geochemical analyses did not reveal any sequence with significant source potential throughout the well. The analyses did however confirm some intervals with migrant hydrocarbons in the Cretaceous. One conventional core was cut in the interval 3665 m to 3677 m in the Cook Formation. No fluid sample was taken.The well was permanently abandoned as a dry well with weak shows on 8 May 1981.TestingNo drill stem test was performed. -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13665.03675.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]10.2Cores 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 typeCONDUCTOR30491.536499.00.00LOTSURF.COND.20800.026810.01.51LOTINTERM.13 3/82014.017 1/22023.01.74LOTINTERM.9 5/83190.012 1/43200.01.94LOTOPEN HOLE4074.08 1/24074.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR CCL4002000CBL VDL GR CCL10003167CBL VDL GR CCL11203193DLL MSFL CAL GR31904070DLL MSFL CAL GR SP23003201FDC CNL CAL GR20144070HDT CAL20143200HDT CAL31903840ISF LSS GR SP3744070VSP3863313 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit412133014171587160418641864190719851985219329703111314732033203334533703375337833783460352035203619368337053840384038653957 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.62 -
Geochemical information
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Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8311.07water based13751.2246.015.0water based18031.2848.021.0water based20231.3747.022.0water based30561.5546.029.0water based34181.5550.025.0water based38381.5551.031.0water based40401.6352.031.0water based