6507/2-2
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General information
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Wellbore history
GeneralThe Dønna Terrace forms a large down faulted block on the western margin of the Trøndelag Platform, situated between the Nordland Ridge and the Vøring Basin. The structure to be tested by 6507/2-2 is situated on the western edge of the Dønna Terrace. This structure was earlier tested by well 6507/2-1, which however left a considerable untested column up-dip from the well position. The main target of the well was the Jurassic reservoirs of Garn, Ile, and Tilje Formation. The secondary objectives were to test the prospectivity of the Cretaceous sands in the Lysing and Lange Formations or at least to obtain stratigraphic information from these formations.Operations and resultsWildcat well 6507/2-2 was spudded with the semi-submersible installation Polar Pioneer on 21 October 1991 and drilled to TD at 3958 m in Early Jurassic sediments of the Åre Formation. The well had 37% downtime due mainly to repeated occurrences of stuck drill pipe. Drilling went relatively smooth down to setting of the 9 5/8" casing shoe at 2760 m. After having cut two cores in the 8 1/2" section the well was shut in due to an influx at 3336 m. The well was killed with increased mud weight, but the pipe was found to be stuck. The pipe could not be freed and was cut at 3175 m. The well was then plugged back and sidetracked from 2989 m and drilled to 3326 m with minor problems. A 7" liner was run and set with shoe at 3324 m and the 6" section was then drilled to 3737 where parts of the bit sub was lost in the hole. This led to 20 days lost while attempting to recover the fish and sidetrack past the fish. Eventually the fish was partly recovered and drilling commenced to TD. The well was drilled with seawater and hi-vis pills down to 685 m and with a KCl/polymer mud from 685 m to TD.Oil shows were recorded on sandstone laminae in the interval 2208 ? 2750 m in the Shetland Group. The Cretaceous Lysing Formation was encountered at 2817.5 m, and the Lange Formation at 2831 m. A total of 23 m net sand was interpreted in the Cretaceous interval. Both Lysing and Lange Formation proved to be gas filled and the reservoirs were tested and exhibited fair to good production rates. Top Jurassic was encountered at 3380 m with a 292.5 m thick Melke Formation. Top Garn Formation came in at 3672.5 m. A total of 65.8 m net sand with an average porosity of 14.8% was penetrated in the Early and Middle Jurassic. The Jurassic sands were water filled, but weak to moderate shows were recorded on all cores from the Jurassic.Six cores were cut in the well. The two first were cut in the first hole from 2822 m to 2849.4 m in the Lysing and top Lange Formation and from 3278 m to 3296 m in the hydrocarbon-bearing Intra-Lange Formation sandstone. Cores 3 to 6 were cut in the sidetrack. Core 3 was cut over a second Intra-Lange sand from 3330 m to 3339.4 m; core 4 was cut from 3685 m to 3700 m in the Middle Jurassic Fangst Group, while core 5 and 6 were cut at 3770 m to 3778.5 m and at 3921 m to 3930 in sandstones of the Early Jurassic Båt Group. RFT fluid samples were taken at 3270.5 m (water and filtrate), 3280 m, 2825 m (water/filtrate and gas), and 3331.6 m (water/filtrate and gas).The well was permanently abandoned on 16 March 1992 as a gas condensate discovery.TestingTwo DST tests were performed in the Cretaceous.DST 1A from the interval 3285.4 m to 3294.4 m in an intra- Lange Formation sandstone flowed 676000 Sm3 gas and 107 Sm3 oil/condensate per day through a 25.4mm choke. The GOR was 4950 Sm3/Sm3, the condensate density was 0.796 g/cm3, the gas gravity (air =1) was 0.63, and the gas contained 0.65 % CO2 and 0.2 ppm H2S. The bottom hole temperature recorded in the test was 118.4 deg C.DST 2 from 2820 m to 2831 m in the Lysing Formation flowed 865000 Sm3 gas and 80 Sm3 oil/condensate per day through a 25.5 mm choke. The GOR was 10800 Sm3/Sm3, the condensate density was 0.787 g/cm3, the gas gravity (air =1) was 0.645, and the gas contained 0.7 % CO2 and 0.1 ppm H2S. The bottom hole temperature recorded in the test was 99.1 deg C. -
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]690.003957.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12822.02849.5[m ]23273.03295.8[m ]33330.03339.3[m ]43685.43700.4[m ]53770.03778.5[m ]63921.03929.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]91.4Cores 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 typeLaboratory1456.0[m]SWCHYDRO1530.0[m]DCSTRAT1560.0[m]DCSTRAT1590.0[m]DCSTRAT1600.0[m]SWCHYDRO1620.0[m]DCSTRAT1650.0[m]DCSTRAT1670.0[m]SWCHYDRO1680.0[m]DCSTRAT1700.0[m]SWCHYDRO1710.0[m]DCSTRAT1740.0[m]DCSTRAT1760.0[m]SWCHYDRO1770.0[m]DCSTRAT1780.0[m]DCSTRAT1790.0[m]DCSTRAT1800.0[m]DCSTRAT1810.0[m]DCSTRAT1820.0[m]DCSTRAT1830.0[m]DCSTRAT1851.0[m]SWCHYDRO1855.0[m]SWCHYDRO1860.0[m]DCSTRAT1890.0[m]DCSTRAT1899.0[m]SWCHYDRO1920.0[m]DCSTRAT1930.0[m]SWCHYDRO1940.0[m]SWCHYDRO1980.0[m]DCSTRAT1982.0[m]SWCHYDRO1992.0[m]SWCHYDRO2010.0[m]DCSTRAT2040.0[m]DCSTRAT2070.0[m]DCSTRAT2070.0[m]SWCHYDRO2100.0[m]DCSTRAT2130.0[m]DCSTRAT2140.0[m]SWCHYDRO2160.0[m]DCSTRAT2190.0[m]DCSTRAT2208.0[m]SWCHYDRO2220.0[m]DCSTRAT2235.0[m]DCSTRAT2260.0[m]DCSTRAT2280.0[m]SWCHYDRO2290.0[m]DCSTRAT2320.0[m]DCSTRAT2345.0[m]SWCHYDRO2350.0[m]DCSTRAT2380.0[m]DCSTRAT2424.0[m]SWCHYDRO2440.0[m]DCSTRAT2470.0[m]DCSTRAT2555.0[m]DCSTRAT2615.0[m]DCSTRAT2675.0[m]DCSTRAT2700.0[m]SWCHYDRO2725.0[m]DCSTRAT2750.0[m]DCSTRAT2765.0[m]SWCHYDRO2775.0[m]DCSTRAT2795.0[m]DCSTRAT2800.0[m]DCSTRAT2810.0[m]DCSTRAT2818.0[m]SWCHYDRO2820.0[m]DCSTRAT2822.2[m]COD2822.6[m]CSTRAT2822.7[m]DCSTRAT2823.1[m]COD2823.1[m]CSTRAT2823.6[m]CSTRAT2824.6[m]CSTRAT2827.0[m]CSTRAT2827.3[m]CSTRAT2828.5[m]CSTRAT2828.8[m]COD2829.2[m]CSTRAT2831.4[m]CSTRAT2832.0[m]CSTRAT2832.5[m]CSTRAT2832.9[m]CSTRAT2833.0[m]CSTRAT2833.1[m]CSTRAT2833.3[m]COD2834.8[m]CSTRAT2836.8[m]COD2836.9[m]CSTRAT2839.0[m]CSTRAT2840.0[m]DCSTRAT2840.4[m]CSTRAT2841.8[m]CSTRAT2844.0[m]CSTRAT2845.1[m]CSTRAT2849.0[m]CSTRAT2849.4[m]CSTRAT2860.0[m]DCSTRAT2870.0[m]DCSTRAT2880.0[m]DCSTRAT2890.0[m]DCSTRAT2900.0[m]DCSTRAT2901.0[m]SWCHYDRO2910.0[m]DCSTRAT2920.0[m]SWCHYDRO2930.0[m]DCSTRAT2950.0[m]SWCHYDRO2960.0[m]DCSTRAT2970.0[m]SWCHYDRO2980.0[m]DCSTRAT3000.0[m]DCSTRAT3020.0[m]DCSTRAT3025.0[m]SWCHYDRO3030.0[m]DCSTRAT3040.0[m]DCSTRAT3050.0[m]DCSTRAT3060.0[m]DCSTRAT3070.0[m]DCSTRAT3075.0[m]SWCHYDRO3080.0[m]DCSTRAT3110.0[m]DCSTRAT3122.0[m]SWCHYDRO3130.0[m]DCSTRAT3140.0[m]DCSTRAT3150.0[m]DCSTRAT3160.0[m]DCSTRAT3163.0[m]SWCHYDRO3170.0[m]DCSTRAT3173.0[m]SWCHYDRO3180.0[m]DCSTRAT3190.0[m]DCSTRAT3194.0[m]SWCHYDRO3210.0[m]DCSTRAT3225.0[m]DCSTRAT3240.0[m]DCSTRAT3251.0[m]SWCHYDR03255.0[m]DCSTRAT3260.0[m]DCSTRAT3265.0[m]SWCHYDRO3270.0[m]SWCHYDRO3270.0[m]DCSTRAT3273.0[m]DCSTRAT3274.0[m]CSTRAT3275.0[m]SWCHYDRO3275.0[m]CSTRAT3277.0[m]CSTRAT3279.0[m]CSTRAT3286.9[m]CSTRAT3287.0[m]CSTRAT3288.0[m]CHYDRO3294.3[m]CSTRAT3294.7[m]CSTRAT3295.0[m]SWCHYDRO3295.0[m]SWCHYDRO3300.0[m]DCSTRAT3305.0[m]DCSTRAT3307.0[m]DCSTRAT3310.0[m]DCSTRAT3320.0[m]DCSTRAT3325.0[m]SWCHYDRO3326.0[m]DCSTRAT3327.0[m]DCSTRAT3329.9[m]SWCHYDRO3330.1[m]CSTRAT3335.0[m]CSTRAT3335.0[m]DCSTRAT3338.6[m]CSTRAT3345.0[m]DCSTRAT3350.0[m]DCSTRAT3355.0[m]DCSTRAT3360.0[m]DCSTRAT3365.0[m]DCSTRAT3367.3[m]SWCHYDRO3370.0[m]DCSTRAT3373.0[m]SWCHYDRO3375.0[m]DCSTRAT3380.0[m]DCSTRAT3383.2[m]SWCHYDRO3385.0[m]DCSTRAT3395.0[m]DCSTRAT3400.0[m]DCSTRAT3405.0[m]DCSTRAT3410.0[m]DCSTRAT3415.0[m]DCSTRAT3420.0[m]DCSTRAT3425.0[m]DCSTRAT3430.0[m]DCSTRAT3435.0[m]DCSTRAT3440.0[m]DCSTRAT3445.0[m]DCSTRAT3450.0[m]DCSTRAT3455.0[m]DCSTRAT3460.0[m]DCSTRAT3465.0[m]DCSTRAT3470.0[m]DCSTRAT3475.0[m]DCSTRAT3480.0[m]DCSTRAT3485.0[m]DCSTRAT3490.0[m]DCSTRAT3495.0[m]DCSTRAT3500.0[m]DCSTRAT3508.4[m]SWCHYDRO3510.0[m]DCSTRAT3517.0[m]DCSTRAT3530.0[m]DCSTRAT3540.0[m]DCSTRAT3545.0[m]DCSTRAT3550.0[m]DCSTRAT3555.0[m]DCSTRAT3560.0[m]DCSTRAT3570.0[m]DCSTRAT3580.0[m]DCSTRAT3590.0[m]DCSTRAT3600.0[m]DCSTRAT3610.0[m]DCSTRAT3612.2[m]SWCHYDRO3620.0[m]DCSTRAT3630.0[m]DCSTRAT3640.0[m]DCSTRAT3650.0[m]DCSTRAT3660.0[m]DCSTRAT3665.0[m]DCSTRAT3670.0[m]DCSTRAT3680.0[m]DCSTRAT3685.0[m]DCSTRAT3685.7[m]CSTRAT3700.0[m]DCSTRAT3700.4[m]CSTRAT3705.0[m]DCSTRAT3710.0[m]DCSTRAT3715.0[m]DCSTRAT3720.0[m]DCSTRAT3725.0[m]DCSTRAT3730.0[m]DCSTRAT3735.0[m]DCSTRAT3737.0[m]DCSTRAT3740.0[m]DCSTRAT3743.2[m]SWCHYDRO3745.0[m]DCSTRAT3750.0[m]DCSTRAT3760.0[m]DCSTRAT3770.0[m]DCSTRAT3772.8[m]CSTRAT3774.8[m]CSTRAT3778.4[m]CSTRAT3780.0[m]DCSTRAT3784.0[m]SWCHYDRO3784.0[m]SWCHYDRO3785.0[m]DCSTRAT3790.0[m]DCSTRAT3795.0[m]DCSTRAT3800.0[m]DCSTRAT3810.0[m]DCSTRAT3820.0[m]DCSTRAT3830.0[m]DCSTRAT3842.0[m]DCSTRAT3851.0[m]SWCHYDRO3852.0[m]DCSTRAT3862.0[m]DCSTRAT3872.0[m]DCSTRAT3882.0[m]DCSTRAT3892.0[m]DCSTRAT3902.0[m]DCSTRAT3912.0[m]DCSTRAT3920.0[m]DCSTRAT3922.0[m]CSTRAT3923.6[m]CSTRAT3925.0[m]CSTRAT3928.5[m]CSTRAT3929.0[m]CSTRAT3929.4[m]CSTRAT3932.0[m]DCSTRAT3940.0[m]DCSTRAT3950.0[m]DCSTRAT3957.0[m]DCSTRAT -
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 availableDSTTEST1A3294.003285.00CONDENSATE16.02.1992 - 23:00YESDSTTEST22831.002820.0002.03.1992 - 03:57YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit407407139716801680185018501941198728182818283133803380367336733698370337203720374637703810 -
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]pdf20.03 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03285329425.42.02820283125.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01076760000.7900.63063172.0808650000.7800.6401081 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR CCC19002597CST19402097CST21152591CST26103249DLL MSFL GR SP21002602ISF BHC MSFL GR SP4743250LDT CNL GR10263250MWD4743262RFT22052574SHDT GR10263250TEMP5002025TEMP9982551VSP4743250 -
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 typeCONDUCTOR30491.036491.00.00LOTINTERM.18 5/8671.024685.01.48LOTINTERM.13 3/81399.017 1/21414.01.72LOTINTERM.9 5/82761.012 1/42777.02.02LOTINTERM.73324.08 1/23958.02.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4071.00WATER BASED4301.6116.0WATER BASED4911.0518.0WATER BASED5051.0518.0WATER BASED6851.0518.0WATER BASED10511.2617.0WATER BASED12381.6012.0WATER BASED12591.2613.0WATER BASED14141.2614.0WATER BASED16001.3014.0WATER BASED19591.5120.0WATER BASED21001.5518.0WATER BASED23551.5525.0WATER BASED24491.5524.0WATER BASED25171.5725.0WATER BASED25681.7013.0WATER BASED25681.7015.0WATER BASED27271.5723.0WATER BASED27751.6028.0WATER BASED27771.6028.0WATER BASED27831.5022.0WATER BASED28211.5019.0WATER BASED28431.5020.0WATER BASED28631.5020.0WATER BASED29001.7022.0WATER BASED29241.5019.0WATER BASED29871.5019.0WATER BASED29891.7023.0WATER BASED30131.5017.0WATER BASED30451.5017.0WATER BASED30841.7025.0WATER BASED31121.7026.0WATER BASED31541.7024.0WATER BASED31561.5015.0WATER BASED31611.7024.0WATER BASED31751.7022.0WATER BASED31881.7025.0WATER BASED32121.8626.0WATER BASED32571.7028.0WATER BASED32651.5016.0WATER BASED32741.8627.0WATER BASED32831.6213.0WATER BASED32961.5016.0WATER BASED33071.8627.0WATER BASED33261.7024.0WATER BASED33301.7520.0WATER BASED33361.7025.0WATER BASED34481.7520.0WATER BASED35701.7523.0WATER BASED36261.8631.0WATER BASED36381.7524.0WATER BASED36701.8628.0WATER BASED36781.7523.0WATER BASED36841.8630.0WATER BASED36851.8627.0WATER BASED36961.8627.0WATER BASED37001.8628.0WATER BASED37021.8629.0WATER BASED37051.8631.0WATER BASED37101.8631.0WATER BASED37121.8629.0WATER BASED37211.8630.0WATER BASED37361.8631.0WATER BASED37371.8627.0WATER BASED37391.8632.0WATER BASED37411.8630.0WATER BASED37511.8630.0WATER BASED37701.8631.0WATER BASED37961.8631.0WATER BASED39101.8631.0WATER BASED39581.8628.0WATER BASED39581.8633.0WATER BASED -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2824.25[m ]2825.00[m ]2826.25[m ]2828.05[m ]2831.25[m ]3281.00[m ]3282.50[m ]3284.00[m ]3286.50[m ]3287.75[m ]3291.75[m ]3335.50[m ]3337.25[m ]3337.50[m ]3687.50[m ]3690.00[m ]3691.65[m ]3692.45[m ]3694.22[m ]3695.50[m ]3698.50[m ]3698.75[m ]3771.25[m ]3777.00[m ]3275.25[m ]3281.01[m ]3285.50[m ]3286.75[m ]3293.00[m ]3295.00[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]pdf0.28