6406/12-1 S
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General information
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Wellbore history
GeneralWell 6406/12-1 S was designed to drill the Kappa Prospect, which is located west of the Vingleia fault complex and northwest of the Frøya High in the southeastern part of block 6406/12. Structurally the block is situated in the southern part of the Halten Terrace. The prospect was one of several prospective sequences in a Late Jurassic fan complex mapped in the area. The prospect was a stratigraphic trap with no structural closure. The primary objective of the well was to test the hydrocarbon potential of Late Jurassic sandstones in the Kappa prospect. Possible other sands in the Cretaceous or Late Jurassic were secondary targets. The well was also designed to test the geophysical and stratigraphic interpretation of the area and improve the geological, palaeontological and geochemical understanding. No shallow gas warnings were given for this well. Large boulders present in the glacial deposits in the area might cause drilling problems in the 36? and 26" hole section. The pore pressure estimates for the Late Jurassic were uncertain as one of the correlation wells (6406/8-1) penetrated highly over-pressured formations and had serious drilling problems. The other correlation well (6407/10-2) did not penetrate any highly over-pressured formation and had no such problems.Operations and resultsDue to shallow gas from site survey the well was moved 350 m away from target and drilled deviated. Wildcat well 6406/12-1 S was spudded with the semi-submersible rig Ross Rig 15 December 1990. A pilot hole was first drilled to 992 m where gas started to flow into the well bore. The well was killed with heavy mud and plugged. The well was re-spudded 2 January 1991. No major problems occurred while drilling the well after re-spudding. The pore pressure was 1.55 g/Cm3. and gas values were generally low and decreasing down hole. It was drilled to a total depth of 3965 m in the Middle Jurassic Melke Formation. The well was drilled with seawater and hi-vis pills down to 965 m and with Gyp/PAC mud from 965 m to TDNo significant sand development was seen in the Cretaceous section. Top reservoir (Rogn Formation) was encountered at 3600 m, which was 45 m lower than prognosed. It consisted of sandstone as prognosed, but proved to be water bearing. Shows were however observed on conventional and sidewall cores from the Rogn Formation. A total of 120 sidewall cores were attempted and 61 were recovered. A total of 3 conventional cores were cut in this well within the intervals 3603 m to3640 m in the Rogn Formation and 3816 m to 3818 m in the Melke Formation. An RFT fluid sample was taken at 3610 m. It contained water and mud filtrate. The well was permanently abandoned on 1 March 1991 at 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?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]970.003964.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13603.03630.3[m ]23630.33638.0[m ]33816.03817.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]36.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30415.036417.00.00LOTINTERM.20951.026955.01.72LOTINTERM.13 3/82532.017 1/22534.01.82LOTOPEN HOLE3965.012 1/43965.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR7502532CST25653940CST26673940DIL LSS GR CAL415963DIL LSS GR CAL9512545LDL CNL GR23753813LDL GR415963LDL GR9512545LDL GR35923957MWD - DPR415883MWD - DPR4232547MWD - RGD25463965PI LSS GR CAL35923957PI LSS MSFL GR CAL23753813RFT GR36023627RFT GR36103610VSP-NI15503930VSP-WAW1550415VSP-WAW29603100 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit35235211671752175220472047213723232323285430953478347835773600360036253727 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.63 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.44 -
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]pdf36.07 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4920.00WATER BASED18.12.19905120.00WATER BASED18.12.19905941.5812.05.5WATER BASED27.02.19916250.00WATER BASED18.12.19909241.03WATER BASED07.01.19919651.03WATER BASED09.01.19919650.00WATER BASED09.01.19919651.0324.08.0WATER BASED14.01.19919650.0024.08.0WATER BASED14.01.19919651.0324.05.0WATER BASED14.01.19919650.00WATER BASED11.01.19919880.0019.06.5WATER BASED27.12.19909880.00WATER BASED28.12.19909880.0020.06.0WATER BASED02.01.19919880.0028.07.5WATER BASED02.01.19919880.0028.019.0WATER BASED21.12.19909880.0019.05.5WATER BASED27.12.19909880.0010.010.0WATER BASED27.12.19909880.0013.07.0WATER BASED28.12.19909880.0023.06.0WATER BASED02.01.19919880.0028.07.5WATER BASED02.01.19919880.0028.07.5WATER BASED02.01.199113211.2525.05.0WATER BASED15.01.199113561.2525.05.0WATER BASED15.01.199115161.3523.05.0WATER BASED17.01.199115791.3523.05.0WATER BASED17.01.199117811.4521.06.5WATER BASED18.01.199118151.5521.06.5WATER BASED18.01.199120151.6033.08.5WATER BASED21.01.199120261.6033.08.5WATER BASED21.01.199120931.6029.07.5WATER BASED21.01.199121561.6029.07.5WATER BASED21.01.199122001.6030.010.5WATER BASED25.01.199123171.5820.06.0WATER BASED26.02.199123301.6034.08.0WATER BASED21.01.199123301.6029.07.0WATER BASED21.01.199123391.6029.07.0WATER BASED21.01.199123391.6031.06.5WATER BASED22.01.199123391.6031.06.5WATER BASED25.01.199123391.6030.06.0WATER BASED24.01.199125241.6031.06.5WATER BASED22.01.199125251.6031.06.5WATER BASED22.01.199125431.6030.06.0WATER BASED24.01.199125461.5020.04.5WATER BASED28.01.199125461.6031.06.5WATER BASED25.01.199125461.6030.010.5WATER BASED25.01.199125461.6016.07.5WATER BASED28.01.199125461.6016.08.0WATER BASED28.01.199125461.6030.06.0WATER BASED24.01.199125461.5019.05.0WATER BASED30.01.199125461.5026.06.0WATER BASED13.02.199125461.5021.05.5WATER BASED31.01.199125461.5019.05.5WATER BASED04.02.199125461.5017.04.5WATER BASED30.01.199125461.5021.05.0WATER BASED04.02.199125461.5021.05.5WATER BASED05.02.199125461.5022.05.0WATER BASED07.02.199125461.5024.07.0WATER BASED14.02.199125461.5021.04.5WATER BASED15.02.199125461.5018.04.0WATER BASED04.02.199125461.5022.05.5WATER BASED07.02.199125461.5024.05.0WATER BASED11.02.199125491.5016.08.0WATER BASED28.01.199128271.5020.04.5WATER BASED28.01.199129181.5019.05.0WATER BASED30.01.199130001.5017.04.5WATER BASED30.01.199130491.5021.05.5WATER BASED31.01.199130531.5019.05.5WATER BASED04.02.199130741.5018.04.0WATER BASED04.02.199131541.5021.05.0WATER BASED04.02.199132521.5021.05.5WATER BASED05.02.199134191.5022.05.5WATER BASED07.02.199135021.5022.05.0WATER BASED07.02.199135041.5024.05.0WATER BASED11.02.199136271.5825.07.0WATER BASED21.02.199137601.5526.06.0WATER BASED13.02.199138161.5524.07.0WATER BASED14.02.199138181.5521.04.5WATER BASED15.02.199139651.5021.06.5WATER BASED19.02.199139651.5826.06.5WATER BASED20.02.199139651.5824.06.5WATER BASED22.02.199139651.5824.06.5WATER BASED26.02.199139651.5824.06.5WATER BASED26.02.1991 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1460.0[m]DCSTRAT1480.0[m]DCSTRAT1500.0[m]DCSTRAT1510.0[m]DCSTRAT1530.0[m]DCSTRAT1540.0[m]DCSTRAT1560.0[m]DCSTRAT1570.0[m]DCSTRAT1580.0[m]DCSTRAT1600.0[m]DCSTRAT1620.0[m]DCSTRAT1630.0[m]DCSTRAT1650.0[m]DCSTRAT1660.0[m]DCSTRAT1670.0[m]DCSTRAT1690.0[m]DCSTRAT1700.0[m]DCSTRAT1720.0[m]DCSTRAT1740.0[m]DCSTRAT1750.0[m]DCSTRAT1770.0[m]DCSTRAT1790.0[m]DCSTRAT1800.0[m]DCSTRAT1820.0[m]DCSTRAT1830.0[m]DCSTRAT1850.0[m]DCSTRAT1860.0[m]DCSTRAT1870.0[m]DCSTRAT1880.0[m]DCSTRAT1890.0[m]DCSTRAT1900.0[m]DCSTRAT1910.0[m]DCSTRAT1930.0[m]DCSTRAT1950.0[m]DCSTRAT1960.0[m]DCSTRAT1980.0[m]DCSTRAT2000.0[m]DCSTRAT2010.0[m]DCSTRAT2030.0[m]DCSTRAT2040.0[m]DCSTRAT2050.0[m]DCSTRAT2060.0[m]DCSTRAT2070.0[m]DCSTRAT2080.0[m]DCSTRAT2100.0[m]DCSTRAT2120.0[m]DCSTRAT2140.0[m]DCSTRAT2160.0[m]DCSTRAT2170.0[m]DCSTRAT2190.0[m]DCSTRAT2210.0[m]DCSTRAT2220.0[m]DCSTRAT2240.0[m]DCSTRAT2250.0[m]DCSTRAT2270.0[m]DCSTRAT2280.0[m]DCSTRAT2300.0[m]DCSTRAT2320.0[m]DCSTRAT2330.0[m]DCSTRAT2340.0[m]DCSTRAT2360.0[m]DCSTRAT2380.0[m]DCSTRAT2400.0[m]DCSTRAT2410.0[m]DCSTRAT2430.0[m]DCSTRAT2440.0[m]DCSTRAT2460.0[m]DCSTRAT2480.0[m]DCSTRAT2490.0[m]DCSTRAT2500.0[m]DCSTRAT2520.0[m]DCSTRAT2530.0[m]DCSTRAT2550.0[m]DCSTRAT2565.0[m]SWCSTATO2580.0[m]DCSTRAT2590.0[m]DCSTRAT2610.0[m]DCSTRAT2620.0[m]DCSTRAT2640.0[m]DCSTRAT2650.0[m]DCSTRAT2670.0[m]SWCSTATO2680.0[m]DCSTRAT2694.0[m]SWCSTATO2719.0[m]SWCSTATO2730.0[m]DCSTRAT2750.0[m]DCSTRAT2760.0[m]DCSTRAT2780.0[m]DCSTRAT2790.0[m]DCSTRAT2815.0[m]SWCSTATO2830.0[m]SWCSTATO2840.0[m]DCSTRAT2861.5[m]SWCSTATO2890.0[m]DCSTRAT2910.0[m]DCSTRAT2930.0[m]DCSTRAT2950.0[m]DCSTRAT2960.0[m]DCSTRAT2980.0[m]DCSTRAT3000.0[m]DCSTRAT3020.0[m]DCSTRAT3035.0[m]SWCSTATO3039.0[m]SWCSTATO3050.0[m]DCSTRAT3070.0[m]DCSTRAT3080.0[m]DCSTRAT3100.0[m]DCSTRAT3120.0[m]DCSTRAT3140.0[m]SWCSTATO3150.0[m]SWCSTATO3165.0[m]SWCSTATO3180.0[m]DCSTRAT3200.0[m]DCSTRAT3210.0[m]DCSTRAT3230.0[m]DCSTRAT3240.0[m]DCSTRAT3260.0[m]DCSTRAT3270.0[m]DCSTRAT3290.0[m]DCSTRAT3306.0[m]DCSTRAT3318.0[m]DCSTRAT3330.0[m]DCSTRAT3345.0[m]DCSTRAT3360.0[m]DCSTRAT3387.0[m]SWCSTATO3397.0[m]SWCSTATO3415.0[m]SWCSTATO3432.0[m]DCSTRAT3441.0[m]DCSTRAT3450.0[m]DCSTRAT3465.0[m]SWCSTATO3480.0[m]SWCSTATO3490.0[m]SWCSTATO3510.0[m]SWCSTATO3531.0[m]DCSTRAT3543.0[m]DCSTRAT3550.0[m]SWCSTATO3561.0[m]DCSTRAT3561.0[m]SWCSTATO3589.5[m]SWCSTATO3596.0[m]SWCSTATO3607.6[m]CSTATO3615.3[m]CSTATO3625.6[m]CSTATO3629.4[m]CSTATO3632.2[m]CSTATO3634.6[m]CSTATO3636.0[m]CSTATO3636.6[m]CSTATO3637.7[m]CSTATO3643.8[m]SWCSTATO3648.0[m]SWCSTATO3656.0[m]SWCSTATO3665.0[m]SWCSTATO3675.0[m]SWCSTATO3682.0[m]SWCSTATO3687.0[m]SWCSTATO3694.0[m]SWCSTATO3703.0[m]SWCSTATO3714.0[m]SWCSTATO3721.0[m]SWCSTATO3721.0[m]DCSTRAT3727.0[m]SWCSTATO3736.0[m]SWCSTATO3736.0[m]DCSTRAT3741.0[m]SWCSTATO3745.0[m]SWCSTATO3751.4[m]SWCSTATO3756.0[m]SWCSTATO3760.0[m]SWCSTATO3766.0[m]DCSTRAT3779.0[m]SWCSTATO3790.0[m]CSTATO3790.0[m]DCSTRAT3802.0[m]CSTATO3807.0[m]DCSTRAT3811.0[m]SWCSTATO3816.0[m]CSTATO3816.5[m]CSTATO3817.0[m]CSTATO3825.0[m]DCOD3841.0[m]DCSTRAT3850.0[m]DCSTRAT3859.0[m]DCSTRAT3872.0[m]SWCSTATO3875.0[m]DCOD3878.0[m]SWCSTATO3886.0[m]DCSTRAT3896.6[m]SWCSTATO3907.3[m]SWCSTATO3914.0[m]SWCSTATO3923.0[m]SWCSTATO3925.0[m]DCOD3930.0[m]SWCSTATO3937.0[m]SWCSTATO3952.0[m]DCSTRAT3965.0[m]DCSTATO3965.0[m]DCOD