General information Attribute ValueWellbore name7131/4-1TypeEXPLORATIONPurposeWILDCATStatusP&APress releaseFactmaps in new windowMain areaBARENTS SEAWell name7131/4-1Seismic locationST9802 inline 1792 & x-line 6001Production licenceDrilling operatorStatoil ASA (old)Drill permit1094-LDrilling facilityDrilling days42Entered date02.04.2005Completed date13.05.2005Release date13.05.2007Publication date17.09.2007Purpose - plannedWILDCATReentryNOContentDRYDiscovery wellboreNOKelly bushing elevation [m]25.0Water depth [m]331.0Total depth (MD) [m RKB]1295.0Final vertical depth (TVD) [m RKB]1295.0Maximum inclination [°]0.5Bottom hole temperature [°C]45Oldest penetrated ageMIDDLE TRIASSICOldest penetrated formationKOBBE FMGeodetic datumED50NS degrees71° 41' 40.98'' NEW degrees31° 0' 40.96'' ENS UTM [m]7956245.69EW UTM [m]430296.12UTM zone36NPDID wellbore5093
Wellbore historyGeneralWildcat well is 7131/4-1 is located in the Finmark East area in the Barents Sea. It was completed as the most easterly positioned well in Norwegian waters. The objective was to prove hydrocarbons in the Fruholmen Formation of Norian age (the Garja 1 and Garja 2 sandstones) and in the Snadd Formation of Carnian age (the Guovca sandstone).Operations and resultsWell 7131/4-1 was spudded with the semi-submersible installation Eirik Raude on 2 April 2005 and drilled to TD at 1295 m in the Middle Triassic Kobbe Formation. Drilling went without significant incidents down to 811 m where the 13 3/8" casing was set. Then, on 12 April while moving the BOP to below rotary, a hydraulic supply line to the BOP trolley burst and approximately 1.6 m3 hydraulic oil was accidentally discharged to sea. This caused Statoil tosuspend the operation for a total of 432 hrs. The incident was investigated by the Norwegian authorities (Ptil and SFT) in addition to Statoil internally. After performing investigations, necessary authorization was obtained and the operation resumed. Further operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 806 m, and with Glydril (99% KCl/Pac/glycol) mud from 806 m to TD. No shallow gas was observed.Well 7131/4-1 penetrated rocks of Quaternary, Cretaceous, Jurassic, and Triassic age. No Tertiary sediments were present. The observed stratigraphy was close to the prognosis, except for the presence of Stø Formation sandstone, which was not expected to be present at the location. No hydrocarbons were proven in well 7131/4-1, but shows in the form of cut and residual fluorescence was observed in core no.1 in argillaceous sandstone/siltstone at: 919-920 m, 925 m, 929-930 m, and 937-938 m.One core was cut in the Garja 1 sandstone and one core was cut in the Guovca sandstone, as planned. MDT water samples were collected at 880.5 m, 1083 m, and at 1086.5 m in the Stø and Guovca sandstones. The samples were reported to be of very good qualityThe well was permanently abandoned on 13 May 2005 as a dry well.TestingNo drill stem test was performed.
Cuttings at the NPD
Cuttings at the NPDCuttings available for sampling?YES Cuttings at the NPDCutting sample, top depth [m]Cutting samples, bottom depth [m]814.001297.00
Cores at the NPD
Cores at the NPDCore sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom1915.0944.1[m ]21070.01117.9[m ] Cores at the NPDTotal core sample length [m]77.0 Cores at the NPDCores available for sampling?YES
LogsLog typeLog top depth [m]Log bottom depth [m]CST8181268MDT PRESS8801209MDT SAMPL8801083MWD LWD - DCP APX MPR413811MWD LWD - ONE TRAK8111070MWD LWD - ONE TRAK APX10701295PEX DSI GPIT7991293VSP3801280
Casing and leak–off tests
Casing and leak–off testsCasing typeCasing diam.
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30403.036407.00.00LOTSURF.COND.13 3/8799.017 1/2806.01.67LOTOPEN HOLE1295.08 1/21295.00.00LOT
Drilling mudDepth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4061.05SW / BENTONITE 18111.05SW / BENTONITE 112091.3318.0GLYDRIL 7412951.3318.0GLYDRIL 74
Thin sections at the NPD
Thin sections at the NPDDepthUnit1112.15[m ]1108.50[m ]1092.75[m ]1086.75[m ]1079.75[m ]1077.50[m ]1075.53[m ]1071.25[m ]932.50[m ]929.75[m ]924.15[m ]920.38[m ]915.40[m ]917.75[m ]937.20[m ]
Pressure plotsThe pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit. Pressure plotsDocument nameDocument formatDocument size [KB]0.18