2/1-2
Export: PDF
-
General information
-
Wellbore history
GeneralWell 2/1-2 is located on the Sørvestlandet High, ca 6 km northwest of the Gyda Field in The North Sea. The objective was to test possible Late Jurassic sands within a salt-induced structural high.The well is Reference Well for the Mandal and Ula Formations.Operations and resultsWildcat well 2/1-2 was spudded with the semi-submersible installation Nordskald on 14 December 1977 and drilled to TD at 3555 m, 15 m into Late Permian Zechstein anhydrite. The well was drilled with seawater and gel down to 174 m, with Lime Drispac from 174 m to 3135 m, and with Lignosulphonate from 3551 m to TD.Fifty-two meter of Maureen Formation was encountered at 2692 m, directly overlying the Tor Formation at 2743.5 m. The Cromer Knoll Group came in at 3121.5 m, and top Jurassic shales (Mandal Formation), at 3299 m. The Mandal Formation was seen as a potentially excellent source rock for major oil, but was marginally mature on-structure. The well penetrated water-bearing Late Jurassic sandstone (Ula Formation) at a depth of 3316 m. The sandstone was 30.5 m thick and had porosities of less than 10% and permeabilities less than 1 md. The well then penetrated 37.5 m of argillaceous Middle Jurassic sandstone and 156 m of interbedded Triassic sandstones and siltstones with occasional mudstones. No shows were observed in the well while drilling.One full hole core was cut within the Ula Formation sandstone from 3318 to 3336 m. No wire line fluid samples were taken.The well was permanently abandoned on 26 February 1978 as a dry well.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]180.003551.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13318.03336.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]18.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3314.0[m]DC3318.0[m]CAPT3318.9[m]CAPT3319.8[m]CAPT3320.7[m]CAPT3321.6[m]CAPT3322.5[m]CAPT3323.0[m]DC3323.4[m]CAPT3324.3[m]CAPT3325.2[m]CAPT3326.1[m]CAPT3327.0[m]CAPT3327.9[m]CAPT3328.8[m]CAPT3329.7[m]CAPT3330.6[m]CAPT3331.5[m]CAPT3332.0[m]DC3332.4[m]CAPT3333.3[m]CAPT3334.2[m]CAPT3335.1[m]CAPT3336.0[m]CAPT3344.0[m]DC3362.0[m]DC -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit941624252425242581260326922744274430153122312232993299331633163347338433843540 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.53 -
Geochemical information
-
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf13.56 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CDM31323285CDM AP31513274CDM PP31463274FDC CNL24453555ISF SONIC903555TEMP14132350 -
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 typeCONDUCTOR30169.036174.00.00LOTSURF.COND.20557.026562.00.00LOTINTERM.13 3/82226.017 1/22231.00.00LOTINTERM.9 5/83138.012 1/43140.00.00LOTOPEN HOLE3551.08 1/23551.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1740.00sea water3100.00spud mud7741.4043.0waterbased13031.4143.0waterbased21041.5052.0waterbased24821.4949.0waterbased26721.4849.0waterbased28531.5250.0waterbased32771.4952.0waterbased35501.5648.0waterbased -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3331.60[m ] -
Pressure plots
Pressure plots The 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 plots Document nameDocument formatDocument size [MB]PDF0.22