34/10-5
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General information
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Wellbore history
GeneralWell 34/10-5 was drilled in the western part of the Delta Closure in Block 34/10 in the Northern North Sea. The primary objective of well 34/10-5 was sandstones of Middle Jurassic age. Secondary objectives were sandstones of Early Jurassic age.Operations and resultsAppraisal well 34/10-5 was spudded with the semi-submersible installation Ross Rig on 18 October 1979 and drilled to TD at 2780 m in the Late Triassic Lunde Formation. Apart from lost circulation problems in the 12 1/4" section the drilling itself went quite smoothly. However, almost 21 days were lost due to bad weather conditions. The well was drilled with spud mud down to 518 m, with gel/lignosulphonate from 518 to 1775 m, with gel/lignite/lignosulphonate from 1775 m to 2210 m, and with gel/lignosulphonate from 2210 m to TD.The Brent Group was encountered at 1896 m and was oil bearing down to the OWC at ca 1972 m. Test results indicated the same fluid system as in the previous wells drilled on the structure.Oil shows were recorded from 1250 m and downwards more or less continuously on claystone, limestone and siltstone to top Brent level. No shows were recorded below OWC.Four cores were recovered in the interval from 1917 to 1974.7 m. One RFT fluid sample from the Brent Group recovered ca 0.5 l oil and 1 l of mud filtrate.The well was permanently abandoned on 2 January 1980 as an oil appraisal well.TestingThe Tarbert Formation was tested from perforations in the interval 1925 -1927 m. The zone produced ca 724 Sm3 oil and 59400 Sm3 gas /day. No water was produced. The GOR was 82 Sm3/Sm3 and the oil gravity was 29 deg API. The bottom hole maximum temperature was 74.5 deg C, measured at 1907 m. -
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]220.002780.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11910.71928.7[m ]21930.01934.2[m ]31949.21959.8[m ]41967.41974.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]39.4Cores 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 typeCONDUCTOR30225.036227.00.00LOTSURF.COND.20502.026518.01.59LOTINTERM.13 3/81598.017 1/21610.01.76LOTINTERM.9 5/81766.012 1/41775.01.98LOTLINER72209.08 1/22210.01.94LOTOPEN HOLE2780.062780.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01900190212.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.074Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0724594000.88282 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL GR4601766CBL VDL GR16112208DLL MSFL GR18672159FDC CNL GR CAL17652776FDC GR CAL5021770GEODIP18892001HDT17762160HDT22082777ISF SON GR SP1612775VELOCITY2962770 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1619169259451057109711201195121513901555155516131734173418571857185818961896197020352070213421482148224023812388256225622649273227642764 -
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]pdf0.06pdf1.06pdf11.76pdf0.91pdf3.82pdf0.24pdf0.57pdf0.47pdf0.26pdf0.98pdf1.04pdf0.81pdf0.69 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14751.25waterbased15401.32waterbased17051.55waterbased18851.75waterbased19431.78waterbased20901.77waterbased -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1859.0[m]DC1862.0[m]DC2156.0[m]DC2162.0[m]DC2189.0[m]DC2207.0[m]DC2213.0[m]DC2228.0[m]DC2276.0[m]DC2285.0[m]DC2294.0[m]DC2300.0[m]DC2357.0[m]DC -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1911.00[m ]1912.00[m ]1914.00[m ]1918.00[m ]1921.00[m ]1924.00[m ]1926.00[m ]1931.00[m ]1932.00[m ]1934.00[m ]1950.00[m ]1952.00[m ]1955.00[m ]1959.00[m ]