6407/1-4
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General information
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Wellbore history
GeneralWell 6407/1-4 was drilled primarily to appraise the 6407/1-3 Tyrihans Nord Discovery. The specific target was to encounter a free oil-water-contact in the Garn Formation. Secondary objective was to gather information from the possibly oil bearing Campanian sandstone interval (Nise Formation).Operations and resultsAppraisal well 6407/1-4 was spudded with the semi-submersible installation Byford Dolphin on 6 June 1996 and drilled to TD at 3805 m in the Middle Jurassic Not Formation. Due to a labour conflict the MWD services was not run in the top hole down to 810 m. In addition 183 hrs rig time was lost during the strike. The well was drilled with seawater and prehydrated bentonite sweeps down to 816 m, from 816 m to 1810 m with ANCO 2000 mud, and with oil based Ancovert mud from 1810 m to TD.The upper part of the Nise Formation was dominated by siltstone with abundant thin laminas of very fine sandstone and rare limestone stringers. From 2560 m the siltstone progressively grades to claystone, becoming 100 % claystone at 2620 m. Top Garn reservoir came in 101 m thick at 3675 m, 18 m deep to prognosis, so rock-volume above proven OWC was reduced. The reservoir was more cemented than expected. Trace fluorescence and crush cut was recorded in a single siltstone cutting sample from the Springar Formation at 2470 m, otherwise no shows were seen above the shales and claystones of the Late Jurassic Spekk and Melke Formations. Gas on oil on water was encountered in the Garn Formation reservoir. The gas/oil contact was at 3681 m, while the oil/water contact was at 3705 m. No shows were recorded below the OWC. One conventional core was cut from 2498 m to 2526 m in the Nise Formation. Two conventional cores were cut across both fluid contacts from 3679.0 m to 3740.0 m in the Garn Formation, A FMT water sample was taken below the OWC at 3709 m. Two segregated FMT samples were taken to collect gas (3679.2 m) and oil (3691.2 m).The well was permanently abandoned on 23 August 1996 as an oil and gas appraisal well.TestingOne drill stem test was performed from 3687 m to 3693 m in the oil zone in the Garn Formation. The test produced at the end of the multirate period 29505 Sm3 gas and 243.9 Sm3 oil /day. The GOR was 120 Sm3/Sm3 and the oil density was 0.86 g/cm3. -
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]830.003805.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12498.02526.0[m ]23679.03706.6[m ]33706.63739.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]88.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTDST10.000.00OIL03.08.1996 - 00:00YES -
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 typeCONDUCTOR30371.036373.00.00LOTSURF.COND.20810.026813.01.35LOTINTERM.13 3/81802.017 1/21804.01.78LOTINTERM.9 5/83670.012 1/43674.01.50LOTLINER73805.08 1/23805.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03693368712.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.03.00015.100136Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0244295050.8600.690121 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DEL2 HDIL MAC CAL DSL CHT14003677DSL2 ZDL CN GR36703805HDIL MAC DSL GR CHT36703805HEXDIP GR CHT18003677HEXDIP GR CHT36703807MAC GR CHT18003677MWD - DPR28101806MWD - DPR2A18062485MWD - DPR2A28453668RCI GR CHT36673765RCORE GR CHT24613623VSP GR9503655VSP GR35653800ZDL CN DSL CHT18003677 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit31131114441878187822202220228423472347247927803116311631543547357135713595367536753776 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.38 -
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]pdf20.47 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8601.0716.0ANCO 200018101.3018.0ANCO 200020401.6357.0ANCO VERT21901.6357.0ANCO VERT24981.7252.0ANCO VERT25261.7250.0ANCO VERT36751.7254.0ANCO VERT37061.2021.0ANCO VERT38051.2025.0ANCO VERT -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1860.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCRRI1930.0[m]DCRRI1950.0[m]DCRRI1960.0[m]DCRRI1980.0[m]DCRRI1990.0[m]DCRRI2010.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2050.0[m]DCRRI2070.0[m]DCRRI2080.0[m]DCRRI2100.0[m]DCRRI2110.0[m]DCRRI2130.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2170.0[m]DCRRI2190.0[m]DCRRI2200.0[m]DCRRI2220.0[m]DCRRI2230.0[m]DCRRI2250.0[m]DCRRI2260.0[m]DCRRI2280.0[m]DCRRI2290.0[m]DCRRI2310.0[m]DCRRI2320.0[m]DCRRI2340.0[m]DCRRI2350.0[m]DCRRI2370.0[m]DCRRI2380.0[m]DCRRI2400.0[m]DCRRI2410.0[m]DCRRI2430.0[m]DCRRI2440.0[m]DCRRI2460.0[m]DCRRI2461.0[m]SWCWESTL2470.0[m]DCRRI2470.5[m]SWCWESTL2490.0[m]DCRRI2498.2[m]DCWESTL2503.7[m]CWESTL2508.8[m]CWESTL2513.8[m]CWESTL2519.7[m]CWESTL2525.8[m]CWESTL2539.0[m]SWCWESTL2540.0[m]DCRRI2550.0[m]DCRRI2570.0[m]DCRRI2580.0[m]DCRRI2600.0[m]DCRRI2610.0[m]DCRRI2630.0[m]DCRRI2640.0[m]DCRRI2660.0[m]DCRRI2670.0[m]DCRRI2690.0[m]DCRRI2700.0[m]DCRRI2720.0[m]SWCWESTL2720.0[m]DCRRI2730.0[m]DCRRI2750.0[m]DCRRI2760.0[m]DCRRI2780.0[m]DCRRI2800.0[m]DCRRI2820.0[m]DCRRI2830.0[m]DCRRI2850.0[m]DCRRI2860.0[m]DCRRI2880.0[m]DCRRI2890.0[m]DCRRI2910.0[m]DCRRI2920.0[m]DCRRI2940.0[m]DCRRI2948.0[m]SWCWESTL2950.0[m]DCRRI2970.0[m]DCRRI3120.0[m]DCRRI3122.5[m]SWCWESTL3135.0[m]SWCWESTL3140.0[m]DCRRI3150.0[m]DCRRI3160.0[m]SWCWESTL3170.0[m]DCRRI3180.0[m]DCRRI3186.0[m]SWCWESTL3200.0[m]DCRRI3210.0[m]DCRRI3230.0[m]DCRRI3240.0[m]DCRRI3260.0[m]DCRRI3270.0[m]DCRRI3290.0[m]DCRRI3300.0[m]DCRRI3317.0[m]SWCWESTL3320.0[m]DCRRI3330.0[m]DCRRI3350.0[m]DCRRI3356.0[m]SWCWESTL3356.0[m]SWCRRI3360.0[m]DCRRI3380.0[m]DCRRI3390.0[m]DCRRI3406.5[m]SWCWESTL3410.0[m]SWCWESTL3410.0[m]DCRRI3420.0[m]DCRRI3440.0[m]DCRRI3450.0[m]DCRRI3452.0[m]SWCWESTL3470.0[m]DCRRI3480.0[m]DCRRI3482.5[m]SWCWESTL3492.5[m]SWCWESTL3500.0[m]DCRRI3531.0[m]DCRRI3540.0[m]DCRRI3546.0[m]DCRRI3549.5[m]SWCWESTL3552.0[m]DCRRI3558.0[m]DCRRI3564.0[m]DCRRI3576.0[m]DCRRI3582.0[m]SWCWESTL3582.0[m]DCRRI3587.0[m]SWCWESTL3588.0[m]DCRRI3594.0[m]DCRRI3600.0[m]DCRRI3604.0[m]SWCWESTL3606.0[m]DCRRI3608.0[m]SWCWESTL3612.0[m]DCRRI3618.0[m]DCRRI3622.5[m]SWCWESTL3624.0[m]DCRRI3630.0[m]DCRRI3636.0[m]DCRRI3642.0[m]DCRRI3648.0[m]DCRRI3654.0[m]DCRRI3660.0[m]DCRRI3666.0[m]DCRRI3672.0[m]DCRRI3676.0[m]DCRRI3680.4[m]CRRI3685.4[m]CRRI3688.9[m]CRRI3696.8[m]CRRI3701.2[m]CRRI3704.1[m]CRRI3704.6[m]CRRI3707.6[m]CRRI3713.8[m]CRRI3717.9[m]CRRI3725.6[m]CRRI3730.6[m]CRRI3734.4[m]CRRI