34/8-16 S
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General information
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Wellbore history
GeneralWell 34/8-16 S was drilled to test the Tarvos and Iapetus East prospects, East of the Visund Field on Tampen Spur in the North Sea. Primary objective was to prove economical accumulation of gas and/or condensate in the Tarvos Lomvi Prospect (Lomvi Formation), and to encounter the gas-water contact. Secondary objective was to explore possible additional volumes in Iapetus East prospect (Brent and/or Statfjord) and Tarvos Lunde prospect (Lunde Formation).Operations and resultsWildcat well 34/8-16 S was spudded with the semi-submersible installation Songa Trym on 28 September 2015 and drilled to TD at 3875 m (3830 m TVD) m in the Late Triassic Teist Formation. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 465 m , with Glydril mud from 465 to 1441 m, and with XP-07 oil-based mud from 1441 m to TD.Top of the upper target, the Iapetus prospect, was penetrated at 3115.5 m (3101.6 m TVD) and proved to be of Late Triassic age, Lunde Formation. This reservoir contained oil and gas-condensate down to a free-water level at ca 3205 m (3188 m TVD). Pressure data proved several pressure regimes within the hydrocarbon-bearing interval, with oil on top. The stratigraphically deeper Tarvos prospects were both water-filled. Oil shows, described with direct and cut fluorescence were described in sandstones in the intervals 3175 to 3270 m, 3312 to 3322 m, 3343 to 3408 m, and 3442 to 3469 m.Two cores were cut in the well. Core 1 was cut from 3173 to 3227 m with 98.9% recovery in the Lunde Formation. Core 2 was cut from 3542 to 3596 m with 99.6% recovery in the Lomvi Formation. MDT fluid samples were taken at 3117.9 m (Oil), 3133.5 m (gas), 3152.6 m (gas), and 3182.4 m (gas).The well was permanently abandoned on 15 November 2015 as a as an oil/condensate/gas 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]1450.003875.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13173.03226.4[m ]23542.03595.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]107.2Cores 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 typeCONDUCTOR30465.836465.80.00SURF.COND.201431.5261441.01.60FITINTERM.9 5/82953.012 1/42963.01.82FIT3875.08 1/23875.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT LT PEX HNGS29513878MDT CMR GR31063841MDT GR31173207MWD LWD - GR RES PRES DI4653875QGEO MSIP GR24553878XLROCK GR30143842ZO VSP GR4323865 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit403100710691361162618241824186318991983310931093116311634373610 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4051.3514.0SW/Polymer4651.6019.0Kill fluid4881.4016.0EMS 44006001.339.0EMS 44006001.409.0EMS 440010941.6015.0Kill Fluid- SW/Polymer17401.4122.0EMS 440026881.4925.0EMS 440028141.5121.0EMS 440028141.6537.0EMS 440028301.5026.0EMS 440028301.4327.0EMS 440029631.5529.0EMS 440029631.5027.0EMS 440030141.6545.0EMS 440030201.6031.0EMS 440031721.6232.0EMS 440034841.6233.0EMS 440036331.6336.0EMS 440036331.6233.0EMS 440037571.6338.0EMS 440038751.6542.0EMS 440038751.6341.0EMS 4400