16/1-34 S
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General information
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Wellbore history
GeneralWell 16/1-34 S is located on the Utsira High, north of the Edvard Grieg Field in the North Sea. It was drilled to appraise the oil-leg in the 16/1-6 S Heimdal Formation Verdandi discovery. Grid Formation injectite sandstones and expected clastic formations of Jurassic age (Garun lead) were secondary targets.Operations and resultsWildcat well 16/1-34 S was spudded with the semi-submersible installation Deepsea Stavanger on 7 July 2021 and drilled to TD at 2383 m (2125.7 m TVD) m in the Late Triassic Raude Formation. The well was drilled S-shaped with a vertical section down to 543 m, up to ca 40 deviation at most, then dropping to 21 deviation in the bottom section. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 543 m, with Rheguard Prime oil-based mud from 543 m to 2016 m and with Glydril Plus mud from 2016 m to TD.In the Heimdal Formation, wellbore 16/1-34 S encountered an oil column of approximately 7 m in good quality reservoir sandstone with a total thickness of 50 m. The oil-water contact was found at 2090.2 m (1850.5 m TVD). Fluid sampling showed good quality oil. However, pressure data in the following 16/1-34 A sidetrack encountered Heimdal in a different pressure segment to the Verdandi gas discovery and consequently the 16/1-34 S oil discovery is considered to represent a separate accumulation which is not in direct contact with the Verdandi gas accumulation. This is referred to as the Lillefix discovery. The Grid Member consists of two sandstone intervals. The upper sandstone is about 8 m thick and is filled with hydrocarbons. The fluid gradient in this sandstone could not be established. The lower sandstone is about 70 m thick and is water filled. No permeable sandstone layers were encountered in the Jurassic Garun lead. There were oil shows in the Grid and Heimdal formations, else no oil shows are described in the well.Three cores were cut in succession in the Heimdal Formation from 2085.5 to 2135.0 m with recoveries between 91.6 and 98.9 %. ORA fluid samples were taken at 2083.86 m (oil/water), 2089.35 m (oil/water), and 2090.88 m (water)The well was permanently abandoned on 31 July 2021 as an oil 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]550.002382.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12085.52095.1[m ]22096.02125.5[m ]32126.02134.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]48.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30209.036209.00.00INTERM.20537.024543.01.74FITINTERM.13 3/81526.0161531.01.99LOTLINER9 5/82015.012 1/42016.01.75LOTOPEN HOLE2364.08 1/22364.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ADT HRLA PEX HNGS20172083CMR NEXT ADT20172106FMIHD PPC MSIP GR20172084LWD - ARC9 TELE900209522LWD - PDOR RAB8 ARC8 SS8 TST82515262015LWD - PDORBIT ARC9 TELE900 SONS85381519LWD - PDORBIT DV6MT T675 SS520172375LWD - TELE900141194ORA20833095XPT ADT HRLA PEX HNGS20172114 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1421423557518059129121216161916931786198920012011208321352159217921792193222522252260226122612316 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1901.051.01.0Bentonite Spud Mud1911.3822.014.3KCL/Polymer mud5451.3522.06.2OBM6101.3932.06.5Rheguard Prime19021.4031.09.5OBM20161.4238.08.5OBM20201.3138.08.5Glydril20471.3835.08.5Rheguard Prime20861.3116.010.5Glydril Plus23841.3122.012.9Glydril Plus