35/11-17
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General information
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Wellbore history
GeneralWell 35/11-17 was drilled to test the Fram West prospect on the Lomre Terrace in the northern North Sea. The primary objective was to test the hydrocarbon potential in the Middle Jurassic Brent Group. Secondary objective was to test the hydrocarbon potential in Middle Jurassic Fensfjord Formation. The Late Jurassic Sognefjord Formation was also expected to be present, but not considered as a significant target.Operations and resultsWildcat well 35/11-17 was spudded with the semi-submersible installation Songa Trym on 24 March 2014 and drilled to TD at 2889 m in the Cook Formation. No significant problem was encountered in the operations. The well was drilled with Seawater down to 622 m, with KCl/Polymer/Glycol mud from 622 m to 1190 m, with XP-07 oil based mud from 1190 m to 2052 m, and with KCl/polymer/glycol mud from 2052 m to TD.In well 35/11-17, hydrocarbons were encountered both in the overburden and in the reservoir. The first hydrocarbon were seen at 1590 to1602 m within the Lista Formation. There was a small increase in gas, increased resistivity, and poor oil shows masked by the oil based mud. Further down in the Shetland there were also two thin sand layers from 2025-2027 m MD with poor oil shows. In the Late Jurassic Sognefjord Formation three 4-7 meter thick calcite cemented sandstones with possible hydrocarbons were found.In the target reservoir sections, hydrocarbons were found at four levels. Gas in a gas down-to situation was found in the Fensfjord Formation from 2352.6 to 2363 m. The Fensfjord Formation also proved oil from 2374 m to an OWC at 2390 m. The Fensfjord reservoir seems to be depleted, and the pressure in the Fensfjord gas is higher than in the oil below, indicating that the shale between the upper gas and the lower oil is a pressure barrier. In the Brent Group, oil was present in the Etive Formation from 2712 m to an OWC at 2722.4 m. The Oseberg Formation had oil from 2773 m to an OWC at 2782.6 m. There were no indication of pressure depletion in the Brent reservoirs.Three cores were cut. Core #1 and #2 were cut from 2358 m in the Fensfjord Formation to 2412 m in the Heather Formation with 100 % recovery. Core #3 was cut from 2718 m in the Etive formation to 2772 m at the base of Rannoch Formation with 98% recovery. MDT fluid samples were taken at 2354 m (gas), 2376 m (oil), 2399 m (water), 2719 m (oil), 2741 m (water), and 2776 m (oil).The well was permanently abandoned on 1 May 2014 as an oil and 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]630.002888.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12358.02385.5[m ]22385.52412.7[m ]32718.02771.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]107.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableMDT2775.900.00OILYESMDT2718.900.00OILYESMDT2376.000.00OILYES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38270176676614551455150015551643167417781904190419742145214521842353240226772677271227442773283728372847 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR MDT GR20512289FMI MSIP13202889HRLA PEX HNGS GR20512889MDT GR23532776MSCT GR21452836MWD LWD - ARC TELE3821190MWD LWD - PDX5 ARCVRES8 TELE SAD11902052MWD LWD - RAB6 ARC6 TELE67520522889USIT CBL GR10352041VSP GR3392819 -
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 typeCONDUCTOR30431.636434.40.00SURF.COND.20614.726622.01.20FITINTERM.13 3/81183.317 1/21190.01.41FITLINER9 5/82050.912 1/42052.01.37FITOPEN HOLE2889.08 1/22889.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5701.2513.0KCl/Polymer/GEM5701.03Seawater5701.03Seawater6221.1420.0KCl/Polymer/GEM7951.1717.0KCl/Polymer/Glycol11721.3217.0XP-07 - Yellow11901.1620.0KCl/Polymer/GEM12651.3121.0XP-07 - Yellow14451.2016.0KCl/Polymer/GEM16501.3223.0XP-07 - Yellow18891.2017.0KCl/Polymer/GEM20521.1716.0KCl/Polymer/GEM20521.3219.0XP-07 - Yellow20731.2018.0KCl/Polymer/GEM24111.2118.0KCl/Polymer/GEM28881.2020.0KCl/Polymer/GEM