6507/5-1
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General information
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Wellbore history
GeneralThe purpose of the 6507/5-1 well was to test the Jurassic sandstones of the Donnatello prospect and potential Cretaceous sandstones. The prospect is located between the Norne and Heidrun fields, in the area of the Dønna Terrace in Nordland II, and about 200km off the coast of Helgeland in North Norway. The well was drilled to allow for future re-entry and re-completion as a producer.Operations and resultsWell 6507/5-1 was drilled with the semisubmersible rig Maersk Jutlander. Water based mud was used down to 1065, oil based mud from there to TD. The well was spudded on December 24th 1997, and TD was reached March 7th 1998. The well reached a TD of 4224 m MD in the Early Jurassic Åre formation. Gas condensate and oil were discovered in Jurassic sandstones of the Fangst and Båt groups, as well as additional oil discovered in sandstones of the Cretaceous Lange Formation. Six cores were cut in the Garn, Not, Ile, and Ror Formations from 3392.5 to 3542.7 m RKB. Another three cores were cut in the Ror, Tofte, Tilje, and Åre Formations from 3562 to 3698.6 m. Thirteen MDT samples containing variable proportions of gas, oil, and mud filtrate were taken in the Lange, Garn, Ile, and Tilje Formations while four MDT samples containing water were taken in the Åre Formation. Following the discovery, Donnatello was renamed Skarv and the well was suspended as an oil and gas discovery.TestingBefore testing the well was cleaned and displaced to a Calcium Chloride brine. Three separate cased hole drill stem tests were run. Two tests were conducted in the Jurassic and one in the Cretaceous Lange formation. DST1 in the Jurassic Tilje formation produced 628 m3 oil with 109,804 m3 of gas per day through a 15.87mm choke. DST2a in the Jurassic Garn formation produced 178m3 of oil with 741,460 m3 of gas per day through a 15.87mm choke. DST2b from the Jurassic Garn and Ile formations combined produced 148m3 of oil and 580,560m3 of gas per day through a 12.70mm choke. DST3 in the Cretaceous Lange formation produced 925m3 of oil and 222,155m3 of gas per day through a 14.28mm choke. -
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]1080.004223.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13392.53392.7[m ]23395.03422.1[m ]33422.13449.8[m ]43449.83470.9[m ]53470.93498.4[m ]63498.43542.7[m ]73562.03613.5[m ]83616.03645.6[m ]93645.03698.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]282.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1440.0[m]DCRRI1500.0[m]DCRRI1560.0[m]DCRRI1560.0[m]SWCRRI1590.0[m]DCRRI1620.0[m]DCRRI1650.0[m]DCRRI1680.0[m]DCRRI1710.0[m]DCRRI1740.0[m]DCRRI1770.0[m]DCRRI1800.0[m]DCRRI1820.0[m]DCRRI1830.0[m]DCRRI1860.0[m]DCRRI1880.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCRRI1939.0[m]DCRRI1966.0[m]DCRRI1987.0[m]DCRRI2002.0[m]DCRRI2020.0[m]DCRRI2032.0[m]DCRRI2050.0[m]DCRRI2062.0[m]DCRRI2068.0[m]DCRRI2076.0[m]DCRRI2086.0[m]DCRRI2101.0[m]DCRRI2125.0[m]DCRRI2137.0[m]DCRRI2149.0[m]DCRRI2167.0[m]DCRRI2182.0[m]DCRRI2194.0[m]DCRRI2209.0[m]DCRRI2233.0[m]DCRRI2257.0[m]DCRRI2266.0[m]DCRRI2281.0[m]DCRRI2299.0[m]DCRRI2311.0[m]DCRRI2326.0[m]DCRRI2344.0[m]DCRRI2359.0[m]DCRRI2374.0[m]DCRRI2380.0[m]DCRRI2404.0[m]DCRRI2416.0[m]DCRRI2434.0[m]DCRRI2446.0[m]DCRRI2464.0[m]DCRRI2476.0[m]DCRRI2497.0[m]DCRRI2509.0[m]DCRRI2527.0[m]DCRRI2539.0[m]DCRRI2557.0[m]DCRRI2569.0[m]DCRRI2587.0[m]DCRRI2599.0[m]DCRRI2614.0[m]DCRRI2626.0[m]DCRRI2644.0[m]DCRRI2659.0[m]DCRRI2674.0[m]DCRRI2689.0[m]DCRRI2704.0[m]DCRRI2715.8[m]SWCRRI2725.0[m]DCRRI2734.0[m]DCRRI2749.0[m]DCRRI2769.0[m]SWCRRI2779.0[m]DCRRI2794.0[m]DCRRI2809.0[m]DCRRI2824.4[m]SWCRRI2839.0[m]DCRRI2854.0[m]DCRRI2865.0[m]SWCRRI2890.0[m]SWCRRI2899.0[m]DCRRI2914.0[m]DCRRI2929.0[m]DCRRI2949.0[m]SWCRRI2964.0[m]SWCRRI2974.0[m]DCRRI2992.5[m]SWCRRI3005.0[m]SWCRRI3021.5[m]SWCRRI3030.5[m]SWCRRI3044.0[m]SWCRRI3064.0[m]DCRRI3079.0[m]DCRRI3088.0[m]DCRRI3094.0[m]DCRRI3103.0[m]DCRRI3109.0[m]DCRRI3118.0[m]DCRRI3123.0[m]SWCRRI3146.5[m]SWCRRI3154.0[m]DCRRI3174.5[m]SWCRRI3192.0[m]SWCRRI3196.0[m]SWCRRI3198.5[m]SWCRRI3214.0[m]DCRRI3229.0[m]DCRRI3245.0[m]DCRRI3251.0[m]CRRI3268.0[m]CRRI3288.0[m]CRRI3300.0[m]CRRI3327.5[m]CRRI3338.0[m]CRRI3352.0[m]CRRI3360.0[m]CRRI3362.0[m]DCRRI3365.0[m]CRRI3368.0[m]DCRRI3370.0[m]CRRI3375.0[m]CRRI3384.0[m]DCRRI3392.0[m]DCRRI3395.7[m]CRRI3402.5[m]CRRI3417.8[m]CRRI3431.6[m]CRRI3433.1[m]CRRI3448.3[m]CRRI3456.3[m]CRRI3460.0[m]CRRI3465.0[m]CRRI3470.9[m]CRRI3473.0[m]CRRI3474.4[m]CRRI3477.0[m]CRRI3480.6[m]CRRI3482.9[m]CRRI3490.0[m]CRRI3500.3[m]CRRI3507.6[m]CRRI3515.1[m]CRRI3521.0[m]CRRI3523.4[m]CRRI3542.6[m]CRRI3567.5[m]CRRI3574.4[m]CRRI3575.2[m]CRRI3579.5[m]CRRI3585.1[m]CRRI3595.1[m]CRRI3601.7[m]CRRI3608.4[m]CRRI3617.9[m]CRRI3623.5[m]CRRI3633.6[m]CRRI3642.8[m]CRRI3647.8[m]CRRI3653.1[m]CRRI3655.6[m]CRRI3657.4[m]CRRI3673.7[m]CRRI3682.7[m]CRRI3690.8[m]CRRI3696.9[m]CRRI3707.0[m]DCRRI3716.0[m]DCRRI3724.0[m]CRRI3734.0[m]DCRRI3743.0[m]DCRRI3752.0[m]DCRRI3761.0[m]DCRRI3767.0[m]DCRRI3779.0[m]DCRRI3788.0[m]DCRRI3797.0[m]DCRRI3815.0[m]DCRRI3824.0[m]DCRRI3833.0[m]DCRRI3842.0[m]DCRRI3851.0[m]DCRRI3857.0[m]DCRRI3941.0[m]DCRRI3989.0[m]DCRRI3998.0[m]DCRRI4142.0[m]DCRRI4151.0[m]DCRRI4160.0[m]DCRRI4169.0[m]DCRRI4178.0[m]DCRRI4187.0[m]DCRRI4196.0[m]DCRRI -
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 availableDSTDST13607.003653.00OIL02.04.1998 - 07:35YESDSTDST23430.003442.00CONDENSATE13.04.1998 - 18:00YESDSTDST2A3494.003514.00CONDENSATE15.04.1998 - 21:30YESDSTDST32993.003001.00OIL26.04.1998 - 08:53YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit347347138118021802198719872032207620762523271627162718317831783194338033803434347635173517357735793688 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.69 -
Geochemical information
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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]pdf79.48 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03607365315.92.13430344215.92.23430351412.73.02993300114.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.08.00037.0002.119.00036.0002.222.0003.018.00042.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.06281090000.8570.7001752.11787410000.7590.67041642.21485800000.7670.67539263.09252220000.8290.670240 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT DSI GR10533221AIT DSI GR32004220CMR27703120CMR200033503800IPLT10533223IPLT32004225MDT13823091MDT33813873MDT34063770MDT35824182MSCT13823199MSCT27153031MSCT32514132MWD CDR GR RES350485MWD CDR GR RES4961063MWD CDR GR RES32394224MWD DIR442496MWD RAB GR RES10693236OBDT28043192UBI30953187UBI31263210UBI32284210USIT28903085USIT31003700W VSP18002300ZO VSP15802180ZO VSP21804130 -
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 typeCONDUCTOR30480.036496.00.00LOTSURF.COND.201053.0261065.01.67LOTINTERM.9 5/83199.012 1/43236.01.95LOTLINER73863.08 1/24224.00.00LOTOPEN HOLE4224.08 1/24224.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3501.60kill mud3501.20spud mud4421.60kill mud4421.00spud mud4961.60kill mud4961.00spud mud5711.00spud mud5711.50kill mud10531.50kill mud10531.00spud mud10651.50kill mud10651.30spud mud10651.00sea water10651.40oil based31991.40oil based32351.40oil based32361.50oil based32411.40oil based34721.40oil based35421.40oil based39321.40oil based40851.46oil based42241.46oil based -
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]pdf0.28