16/2-20 S
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General information
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Wellbore history
GeneralWell 16/2-20 S was drilled on the Torvastad prospect north of the Johan Sverdrup Field on the Utsira High in the North Sea. The primary objective was to investigate the Jurassic - Early Cretaceous sequence with respect to reservoir facies, hydrocarbons, free water level, pressure communication with the Johan Sverdrup Field, and seismic interpretations and depth conversion.Operations and resultsWildcat well 16/2-20 S was spudded with the semi-submersible installation Island Innovator on 30 September 2013 and drilled to TD at 2150 m (2098 m TVD) m, 36 m into granitic basement. A 9 7/8" pilot hole was drilled fromseabed to 720 m RKB to check for shallow gas. No shallow gas was observed. The well was drilled deviated due to a ridge on the seafloor that could cause instability for the wellhead and BOP. The well path is vertical down to ca 730 m, deviated with a sail angel of ca 23 ° from 730 to 1900 m, and vertical from 1900 m to TD. The well was drilled with seawater and hi-vis sweeps down to 720 m and with Aquadril mud from 720 m to TD.An unusual, 21 m thick age-equivalent to the Draupne Formation (Volgian to Ryazanian age) was encountered at 2006.3 m (1954.6 m TVD). It consists of a condensed section at base, a thin shale section, and a 16.6 m thick spiculitic sandstone/siltstone on top. The porosity of these sediments is relatively high, but permeability is very low. Underlying this sequence, at 2027 m (1975.5 m TVD) the well penetrated a 10 m sequence of sandstones belonging to the Statfjord Group, a 77 m sequence of sandstones, limestone and mudstones belonging to the Skagerrak Formation and a 20 m thick Smith Bank Formation resting on the granitic basement. Good oil shows were described in the Statfjord Group.A total of 52.5 m core was recovered in four cores from the interval 2001 to 2055 m. The core to log depth shifts are -2.34 m, -2.12 m, -1.3 m, and -1.3 m for cores 1 to 4, respectively. RCX fluid samples were taken at 2012.5 m (water), 2026.7 m (one sample with water and one with water and a fraction of oil), and at 2031.3 m (water).The well was permanently abandoned on 21 November 2013 as a dry 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]730.002150.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12001.02027.8[m ]22028.02039.8[m ]32040.02044.6[m ]42045.02054.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]52.5Cores 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 typeCONDUCTOR30219.036223.00.00SURF.COND.20713.026720.01.61FITPILOT HOLE720.09 7/8720.00.00INTERM.9 5/81948.012 1/41954.01.73LOTOPEN HOLE2150.08 1/22150.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DSL CN ZDL RTEX MLL19462146DSL IFX RCX15001500DSL IFX RCX S10721072DSL IFX S20122031DSL MAXCORE19582063DSL MREX FLEX19462141DSL PCORE20572115DSL RCX20092115DSL VSP6302130DSL XMAC ORIT STAR UXPL19462137MWD - OTK18951999MWD - OTK APX120708MWD - OTK APX CCN ORD19142147MWD - SDTK CCN ORD ZTK6831954RCX690690 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit140783858952952106911301284153617181718173717841887190019001924193919391978198520062006202720272038203820952114 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured7001.3515.0Water Based12841.3520.0Water Based17801.4025.0Water Based20281.1613.0Water Based20501.1916.0Water Based21501.1618.0Water Based