24/9-14 S
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General information
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Wellbore history
GeneralWell 24/9-14 S was drilled on the Froskelår injectite sands in the Vana Sub-basin in the North Sea. The structure was first drilled by 24/9-3 in 1981 and oil was discovered in the Frigg Formation. These Frigg sands were later re-defined as injectites. The objective of wildcat well 24/9-14 S was to appraise petroleum and reservoir potential in these sands (Eocene Intra Hordaland group sandstones).Operations and resultsAppraisal well 24/9-14 S was spudded with the semi-submersible installation Scarabeo 8 on 19 January 2019 and drilled to TD at 2286 m in the Paleocene Sele Formation. Operations proceeded without significant problems. Oil and gas were discovered, and a coring and data acquisition side-track 24/9-14 ST2 was drilled after reaching TD in the main well. The side-track was drilled from kick-off at 1812 m (1657 m TVD) to its TD at 2145 m (1955 m TVD). The well was drilled with Seawater and sweeps down to 218 m, with KCl/Polymer/GEM mud from 218 to 1558 m, and with Innovert oil-based mud from 1558 m to TD. The side-track was drilled with Innovert oil-based mud from kick-off to its TD.With reference to the main bore: top of the injectite complex was encountered at 1887 m (1732 m TVD) with a main injectite sand in the lower half from 1936 to 1953 m (1781 to 1798 m TVD). There was gas with a gas-oil contact at ca 1763 m TVD and oil with a down-to contact at the base of the main injectite at 1798 m TVD. From pressure data the OWC is placed at 1838 m TVD. Further, pressure data indicate the same oil and water gradients in 24/9-14 S as in the 24/9-3 discovery well, only ca 2.5 bar depleted. This is consistent with production-depletion from the near-by Bøyla Field. Due to OBM-masking of shows on cuttings oil shows are described only in the hydrocarbon-bearing and cored sandstones in the side-track.Three cores were cut in the interval 1882 to 1964 m in the side-track. The recoveries were 21.1 m, 27.9 m, and 24 m for cores 1,2 and 3 respectively. MDT fluid samples were taken in the side-track at 1890.9 m (gas), 1917.2 m (gas), 1929.4 m (oil), 1935.7 m (oil), 1946.4 m (oil), and 1957.4 m (oil)The well was permanently abandoned on 22 February 2019 as an oil and gas appraisal well.TestingBefore P&A a Pressure and Temperature Gauge was installed in the technical side-track (24/9-14 ST2), to collect and transmit data via Electro Magnetic (EM) signal until approximately end of 2023. -
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]270.003132.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11882.01903.1[m ]21909.01935.9[m ]31937.01961.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]72.0Cores 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 typeCONDUCTOR30216.436218.60.00INTERM.13 3/81549.017 1/21558.01.59FITINTERM.9 5/81783.012 1/41789.01.49FITOPEN HOLE2145.08 1/22145.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]LWD - DIR152218LWD - DIR GR RES SON2181558LWD - DIR PWD GR RES SON DEN NEU15581789LWD - DIR PWD GR RES SON DEN NEU17892286LWD - NRM FP17892286T2 LWD - DIR GR RES PWD17831882T2 LWD - RES PWD19642145 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1541543337271012101210281441188719552061206121652250 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2191.50Water4151.20Water15581.27Oil15581.03Water15581.37Water16311.300.2Oil17891.30Oil17931.27Oil18741.30Oil18811.27Oil19211.10Brine19361.27Oil21451.30Oil22861.30Oil