15/6-6
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General information
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Wellbore history
GeneralWell 15/6-6 was drilled to appraise the north eastern flank of Alpha structure on the 15/6-3 Sleipner Vest Discovery in the North Sea. The primary target was a gas bearing Jurassic sandstone known as the Hugin Formation. It was drilled to provide needed structural control and to establish a gas/water contact.Operations and resultsAppraisal well 15/6-6 was spudded with the semi-submersible installation Glomar Biscay II on 1 April 1982 and drilled to TD at 3760 m in Late Triassic sediments of the Skagerrak Formation. The 36" hole had to be reamed several times due to ledging. This also occurred in the top of the 26" section. Forty-six bbl's (7.3 m3) of fluid were lost to the formation during cementing of the 13 3/8" casing. The mud weight in this section was 1.68 which is lower than the previous Sleipner wells. This and the fluid loss can possibly be related to an unconsolidated sand (Skade Formation) interval from 1185 to 1199 m. Minor hole problems were encountered in the 12 1/4" section. The drill string was temporarily stuck at 1627 m after making a connection. The well was drilled with seawater and gel.The well proved sands in the Utsira, Grid, Heimdal, and Sleipner Formations; all water bearing. The gas bearing Hugin Formation was encountered at 3563 m and had a gross thickness of 58 m. The gas/water contact was found at 3607 m, which gives a gross gas interval of 44 m. No oil shows were reported from the target reservoir or other sections in the well.Three cores were taken in the Middle Jurassic interval in the 8 1/2" section. Core 1 recovered 18.5 m sandstone from 3591 m to 3609.5 m. Core 2 recovered 16.0 m sandstone from 3609.5 m to 3622 m. Core 3 recovered 18.9 m Sandstone, shale and coal from 3625.5 m to 3644.5 m. No wire line fluid sample was taken.The well was permanently abandoned on 9 June 1982 as a gas appraisal well.TestingThe well was tested in the interval 3568 - 3578 m in the Hugin Formation where reservoir data indicated significant accumulations of gas and condensate. The test produced 835000 Sm3 gas and 278 Sm3 condensate /day through a 56/64" choke. The GOR (gas/condensate ratio) was 3003 Sm3/Sm3 and the condensate gravity was 47 dg API. The gas gravity was 0.762 (air = 1), the CO2 content was 5 % and the H2S content was 7.5 ppm. -
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]210.003760.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13591.03609.5[m ]23609.53625.5[m ]33625.53644.4[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]53.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory500.0[m]DC530.0[m]DC560.0[m]DC590.0[m]DC620.0[m]DC650.0[m]DC690.0[m]DC710.0[m]DC740.0[m]DC770.0[m]DC800.0[m]DC830.0[m]DC860.0[m]DC890.0[m]DC920.0[m]DC950.0[m]DC980.0[m]DC1010.0[m]DC1040.0[m]DC1070.0[m]DC1100.0[m]DC1130.0[m]DC1160.0[m]DC1190.0[m]DC1220.0[m]DC1250.0[m]DC1280.0[m]DC1310.0[m]DC1340.0[m]DC1370.0[m]DC1400.0[m]DC1430.0[m]DC1460.0[m]DC1490.0[m]DC1520.0[m]DC1550.0[m]DC1580.0[m]DC1610.0[m]DC1640.0[m]DC1670.0[m]DC1700.0[m]DC1730.0[m]DC1760.0[m]DC1790.0[m]DC1820.0[m]DC1850.0[m]DC1880.0[m]DC1910.0[m]DC1940.0[m]DC1970.0[m]DC2000.0[m]DC2030.0[m]DC2060.0[m]DC2090.0[m]DC2120.0[m]DC2150.0[m]DC2180.0[m]DC2210.0[m]DC2220.0[m]DC2230.0[m]DC2240.0[m]DC2250.0[m]DC2260.0[m]DC2270.0[m]DC2280.0[m]DC2290.0[m]DC2300.0[m]DC2310.0[m]DC2320.0[m]DC2330.0[m]DC2340.0[m]DC2350.0[m]DC2360.0[m]DC2370.0[m]DC2390.0[m]DC2400.0[m]DC2410.0[m]DC2420.0[m]DC2430.0[m]DC2440.0[m]DC2450.0[m]DC2460.0[m]DC2480.0[m]DC2500.0[m]DC2510.0[m]DC2540.0[m]DC2570.0[m]DC2600.0[m]DC2630.0[m]DC2660.0[m]DC2690.0[m]DC2720.0[m]DC2730.0[m]DC2740.0[m]DC2750.0[m]DC2760.0[m]DC2770.0[m]DC2780.0[m]DC2810.0[m]DC2840.0[m]DC2870.0[m]DC2900.0[m]DC2930.0[m]DC2960.0[m]DC2990.0[m]DC3020.0[m]DC3050.0[m]DC3080.0[m]DC3110.0[m]DC3140.0[m]DC3170.0[m]DC3200.0[m]DC3230.0[m]DC3260.0[m]DC3290.0[m]DC3320.0[m]DC3350.0[m]DC3380.0[m]DC3401.0[m]SWC3403.0[m]SWC3407.0[m]SWC3409.0[m]DC3410.0[m]SWC3427.0[m]SWC3436.5[m]SWC3451.0[m]DC3462.0[m]SWC3481.0[m]DC3482.0[m]SWC3492.0[m]SWC3495.0[m]SWC3499.0[m]SWC3511.0[m]DC3516.0[m]SWC3524.0[m]SWC3541.0[m]DC3543.0[m]SWC3548.0[m]SWC3554.5[m]SWC3556.0[m]SWC3558.0[m]SWC3562.0[m]SWC3571.0[m]DC3601.0[m]DC3631.0[m]DC3648.2[m]SWC3655.0[m]DC3659.2[m]SWC3661.0[m]DC3664.0[m]DC3691.0[m]DC3702.0[m]SWC3721.0[m]DC3740.0[m]SWC3751.0[m]DC -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13580710431141120219171971220522052260232923532647274027402778305032903354337733983398341835633563362136553655 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.78 -
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]pdf34.77 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03568357822.2Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02788350000.7930.7623003 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AC CBL24463630CALIPER160424CDL CNL GR27633754DIPLOG27733749DLL MLL35003750IEL BHC AC GR SP1903753TEMP1951174TEMP15002754TEMP35693716VSP18003748 -
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 typeCONDUCTOR30196.036197.00.00LOTSURF.COND.20447.026465.01.54LOTINTERM.13 3/81203.017 1/21218.01.67LOTINTERM.9 5/82778.012 1/42794.01.72LOTLINER73686.08 1/23760.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3801.0841.0waterbased7201.1040.0waterbased13601.1249.0waterbased24201.1651.0waterbased32901.3448.0waterbased34401.3447.0waterbased36101.3642.0waterbased36601.3447.0waterbased -
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]pdf0.23