34/10-19
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General information
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Wellbore history
GeneralWell 34/10-19 was drilled to investigate the southern section of the Gullfaks Phase II area. The primary objective was to penetrate the Cook sandstone above the oil water contact at 2118 m seen in well 34/10-9, and to improve the understanding of the reserve distribution in this part of the Gullfaks field. Secondary objective was the Statfjord sandstone.Operations and resultsAppraisal well 34/10-19 was spudded with the semi-submersible installation Ross Isle on 5 October 1983 and drilled to TD at 2218 m in the Triassic Hegre Formation. Shallow gas was encountered in a sand at 332 to 338 m. A 16" liner was required to stop gas flow between 20" and 30" casings. Several drilling breaks occurred in the 12 1/4" hole and lost circulation occurred in the 8 1/2" hole. The well was drilled with gel/seawater down to 8978 m, with gel/seawater/hi-vis pills from 978 m to 1494 m, and with gel/lignosulphonate/lignite mud from 1494 m to TD.The upper sandstone part of the Cook formation (unit C3 and C2) was missing missing due to faulting and erosion. The lower Cook C1 unit was penetrated at 1779 m. This unit consists of dominantly claystones and it was water bearing. The sandstones of the Statfjord Formation were water bearing. Trace shows were recorded in the Hordaland Group on claystones from 960 m to 120 m and on claystone and on limestone from 1340 m to 1470 m. Trace to fair shows on siltstone, claystone and minor sandstones were recorded intermittently below 1470 m and down to 1861 m. No trace of hydrocarbons was seen below this depth.Three cores were cut; one in the interval from 1763 in the Cromer Knoll Group to 1781.3 m in the Cook Formation, and two in the interval 1847 to 1874.8 m in the Jurassic Dunlin Group. No wire line fluid samples were taken.The well was permanently abandoned on 6 December 1983 as a dry well.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]300.002218.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11763.01780.7[m ]21847.01855.7[m ]31856.51874.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]44.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2159309351470147015321660177617791830184020052188 -
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]pdf1.33PDF30.23pdf0.55pdf1.21pdf11.66 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR CCL2151690HDT14811700ISF BHC GR16881846ISF BHC MSFL GR14811700ISF LSS MSFL GR2142216LDL CNL GR2882217MSFL CNL GR16871874RFT17772185RFT18461863SHDT16802216TEMP225953VELOCITY2152216 -
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 typeCONDUCTOR30288.036289.50.00LOTSURF.COND.20969.026978.01.56LOTLINER161073.019 3/41073.01.59LOTINTERM.13 3/81483.017 1/21494.01.86LOTINTERM.9 5/81689.012 1/41700.02.06LOTOPEN HOLE2218.08 1/22218.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3101.0653.0waterbased5501.1044.0waterbased10501.1042.0waterbased13701.3046.0waterbased16401.7749.0waterbased19401.8558.0waterbased -
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]pdf0.21