35/10-7 S
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General information
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Wellbore history
GeneralWell 35/10-7 S was drilled to test the Toppand prospect on the Lomre Terrace in the North Sea. The primary objective was to Prove commercial hydrocarbons in the Etive and Oseberg formations (Brent Group) and Cook Formation(Dunlin Group).Operations and resultsWildcat well 35/10-7 S was spudded with the semi-submersible installation West Hercules on 2 November 2021 and drilled to TD at 3594 m (3540,6 m TVD) in the Early Jurassic Amundsen Formation. The well was drilled S-shaped, vertically through the target reservoirs section. In the 17 1/2" section a leak in the BSR was discovered. The BOP was pulled for repairs. This caused 5.5 days NPT. Otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 781 , with Glydril mud from 781 m to 1742 m, and with Exploradrill oil-based mud from 1742 m to TD.Well 35/10-7 S found hydrocarbons in the Ness and Etive formations. The Oseberg and Cook Formations were dry. A hydrocarbon-down-to contact was found in the Etive Formation at 3374 m (3320 m TVD). PVT analyses show that the hydrocarbon fluids are in a near-critical state and that there is a gas-condensate phase over an oil leg. A mean gas-oil-contact (GOC) of 3294 m (3241 m TVD) has been estimated. In addition to shows in the hydrocarbon-bearing formations there were shows (petroleum odour, direct and cut fluorescence) in the interval 3405 to 3467 m in the Oseberg Formation.Two cores were cut in succession from 3323 m to 3469 m in the Ness, Etive, Rannoch, Oseberg, and Drake formations. MDT fluid samples were taken at 3260.4 m in the Ness Formation (oil), 3320.2 m in the Etive Formation (oil), and 32400 m in the Oseberg Formation (water).The well was permanently abandoned on 11 December 2021 as a near-critical oil and condensate 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]790.003594.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13323.03414.0[m ]23414.03467.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]144.4Cores 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 typeINTERM.20771.326781.01.35FITINTERM.13 3/81734.317 1/21742.01.62LOTLINER9 5/83128.012 1/43129.01.91LOTOPEN HOLE3595.58 1/23595.50.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT CMR32253595MSIP NGI00MWD - GR RES DEN NEU SON FPWD PW7841710MWD - GR RES DEN NEU SON FPWD PW17423129MWD - GR RES DEN NEU SON PWD404765MWD - GR RES PWD404784MWD - GR RES PWD7841742MWD - GR RES PWD34693594NGI MSIP31283595PEX HNGS NEXT XPT AIT31283595VSI410393594 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38338582790617611761182218571960215021502274276328302830286528682877287730143248324832603343337433983464346434893545 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5391.6012.014.5Spud Mud6031.309.013.5Spud Mud7411.1520.015.0Glydril8831.1817.012.5Glydril9011.1616.011.0Glydril9231.2018.012.5Glydril10351.1618.09.0Glydril13851.2017.013.0Glydril14821.1716.012.5Glydril16751.3527.09.0Exploradrill17101.1716.011.0Glydril17411.2619.04.0Exploradrill17421.2019.012.5Glydril18721.2219.08.0Exploradrill20611.2521.08.5Exploradrill23521.3226.011.0Exploradrill26801.3326.012.0Exploradrill29241.3525.010.0Exploradrill32081.5729.09.0Exploradrill35941.5834.08.5Exploradrill