6507/11-3
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General information
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Wellbore history
GeneralWell 6507/11-3 was designed to test the Beta Fault compartment of the Midgard Discovery off shore Mid Norway. The Beta segment is a part of the Midgard horst. This horst is defined by NNV trending normal faults. It is separated from the other compartments by a ENE trending cross fault and exhibits true vertical closure at Base Cretaceous level. The primary target was reservoir rocks of the Middle Jurassic Fangst Group with the objective to establish the GWC within a good sand and to perform a DST in a formation not previously being tested (the Ile Formation). The location was chosen relatively high on the structure in case the hydrocarbon contact for Beta was different from what was seen in the Alpha and Gamma structures. The well should reach Triassic rocks or drill to 500 m below the coal reflector. The proposed depth was 3250 m. The pre-drill classification of the well was wildcat.The well is Type Well for the Ile and Not Formation of the Fangst Group.Operations and resultsWell 6507/11-3 was spudded with the semi-submersible installation Treasure Saga on 3 June 1985 and drilled to TD at 3250 m in the Triassic Grey Beds. While drilling the reservoir, mud weight had to be raised gradually to 1.6 g/cm3 due to high trip gas. Approximately 2 weeks were lost due to a work conflict. The well was drilled with spud mud down to 421 m, with gel mud from 421 m to 868 m, with gypsum/polymer mud from 868 m to 2615 m, and with gel mud from 2615 m to TD.The average background gas down to the 20" casing point was 0.4% to 0.8% with peaks at 505 m (3.43%), 540 m (1.08%), 576 m (1.76%) and 663 m (1.97%). Methane was the only gas component present. The well proved mainly claystones down to the Fangst Group. The Cainozoic with a total thickness of 1771 m overlies a 271 m Cretaceous sequence. Late Jurassic consisted of 14.5 m hot shale of the Spekk Formation and 39.5 m of silty claystones of the Melke Formation. The Fangst Group consisted of the Garn, Not, and Ile Formations as in the other wells in the area. The Garn and the Ile Formations had very good reservoir properties, while the Not Formation is a non-reservoir zone in between. Two mudstone SWC's at 2170 m and 2197 m in the Shetland Group had oil shows. The first oil shows below this depth were observed in the Melke Formation at 2393 m. The Fangst Group had gas above a thin oil zone. The GOC was encountered at 2514 m, and the OWC at 2525.5 m. There were no shows below OWC.Six cores were cut in the Fangst Group and another three cores were cut in the Tilje Formation. Six segregated fluid samples were taken on FMT; four at 2426.5 m, 2456 m, 2473.5 m, and 2512 m in the gas/condensate zone, and at two at 2516.3 m and at 2520 m in the oil zone.The well was permanently abandoned on 15 August 1985 as an oil/gas discoveryTestingThree drill stem tests were performed; one in the oil zone and two in the gas zone.DST 1 tested the oil zone from 2519.0 m to 2520.5 m. Rates were increased in steps up to 1500 Sm3/day to investigate gas coning behaviour. The GOR without gas coning was ca 140 Sm3/Sm3. Stock tank oil gravity was 0.8506 g/cm3.DST 2 tested the interval 2495.7 m to 2508.7 in the gas zone and flowed 564000 Sm3 gas/day through a 14.3 mm choke in the main flow. The gas/condensate ratio of the fluid was 6850 Sm3/Sm3.DST 3 tested the interval from 2413.0 m to 2419.5 m in the gas zone and flowed 584000 Sm3 gas/day through a 14.3 mm choke in the main flow. The gas/condensate ratio of the fluid was 7100 Sm3/Sm3. -
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]430.003250.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12428.02437.5[m ]22437.52456.0[m ]32456.02465.3[m ]42467.02494.5[m ]52494.52522.0[m ]62522.02536.8[m ]72636.02643.9[m ]82650.02660.2[m ]92668.52677.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]134.2Cores 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 availableDSTDST12519.002521.0001.08.1985 - 16:30YESDSTDST22495.002508.0005.08.1985 - 17:00YESDSTDST32412.502419.5010.08.1985 - 10:53YES -
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 typeCONDUCTOR30414.036449.00.00LOTSURF.COND.20849.026868.01.52LOTINTERM.13 3/81903.017 1/21918.01.83LOTINTERM.9 5/82600.012 1/42615.01.79LOTOPEN HOLE3250.08 1/23250.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02519252125.42.02496250931.83.02413242038.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.023.0008.00023.000902.024.00012.00020.000903.025.00010.00024.00090Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01490295000.8470.7201982.014800000.6903.017400000.670 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL7301902CBL VDL17002599CDL CNL GR19022615CDL CNL GR26593242COREGUN24282677CORGUN26352679DIFL LS BHC CDL CBL GR8491918DIFL LS BHC GR19022615DIFL LS BHC GR26593243DIPLOG19022609DIPLOG26593243DLL MLL GR23202610FMT24142536FMT24423226MWD - GR RES DIR4153246VSP17503250 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit31631613951754175419631963203820872087229022902347235823582373241224122457247225362536263028253193 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf3.57 -
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]pdf14.82 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4491.0547.025.0WATER BASED07.06.19857631.1750.029.0WATER BASED10.06.19858681.1843.033.0WATER BASED10.06.19858731.1514.025.0WATER BASED02.07.198513001.2016.020.0WATER BASED02.07.198515801.2318.022.0WATER BASED02.07.198519181.4067.019.0WATER BASED03.07.198519181.4060.018.0WATER BASED04.07.198519181.4012.018.0WATER BASED08.07.198519181.4067.019.0WATER BASED03.07.198519181.4060.018.0WATER BASED04.07.198519181.4012.018.0WATER BASED08.07.198519181.4065.025.0WATER BASED02.07.198521511.5325.019.0WATER BASED08.07.198523181.5337.023.0WATER BASED08.07.198524021.6036.017.0WATER BASED11.07.198525451.3058.010.0WATER BASED29.07.198526231.2617.010.0WATER BASED22.07.198526441.2117.010.0WATER BASED22.07.198526801.2017.010.0WATER BASED22.07.1985 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1910.0[m]DCSTRAT1920.0[m]SWCSTRAT1930.0[m]DCSTRAT1950.0[m]DCSTRAT1965.0[m]SWCSTRAT1974.0[m]SWCSTRAT1980.0[m]DCSTRAT2003.0[m]SWCSTRAT2010.0[m]DCSTRAT2022.0[m]SWCSTRAT2026.0[m]SWCSTRAT2050.0[m]DCSTRAT2060.0[m]SWCSTRAT2070.0[m]DCSTRAT2083.0[m]SWCSTRAT2086.0[m]SWCSTRAT2091.0[m]SWCSTRAT2109.0[m]SWCSTRAT2120.0[m]DCSTRAT2130.0[m]SWCSTRAT2143.0[m]SWCSTRAT2150.0[m]DCSTRAT2160.0[m]DCSTRAT2170.0[m]SWCSTRAT2180.0[m]DCSTRAT2190.0[m]DCSTRAT2197.0[m]SWCSTRAT2210.0[m]DCSTRAT2220.0[m]DCSTRAT2227.0[m]SWCSTRAT2240.0[m]DCSTRAT2251.0[m]SWCSTRAT2260.0[m]DCSTRAT2267.0[m]SWCSTRAT2280.0[m]DCSTRAT2285.0[m]SWCSTRAT2289.0[m]SWCSTRAT2295.0[m]DCSTRAT2295.0[m]SWCSTRAT2310.0[m]DCSTRAT2320.0[m]DCSTRAT2331.0[m]SWCSTRAT2340.0[m]DCSTRAT2359.0[m]SWCSTRAT2366.5[m]SWCSTRAT2372.0[m]SWCSTRAT2383.0[m]SWCSTRAT2393.5[m]SWCSTRAT2404.0[m]SWCSTRAT2413.0[m]SWCSTRAT2420.0[m]SWCSTRAT2439.6[m]CSTRAT2457.0[m]CSTRAT2465.0[m]CSTRAT2467.0[m]CSTRAT2475.0[m]CSTRAT2481.7[m]CSTRAT2491.1[m]CSTRAT2499.0[m]CSTRAT2508.4[m]CSTRAT2517.5[m]CSTRAT2530.0[m]CSTRAT2536.7[m]CSTRAT2539.0[m]DCSTRAT2546.0[m]SWCSTRAT2551.0[m]DCSTRAT2559.5[m]SWCSTRAT2569.0[m]DCSTRAT2579.0[m]SWCSTRAT2588.0[m]SWCSTRAT2600.0[m]SWCSTRAT2611.0[m]DCSTRAT2620.0[m]DCSTRAT2631.5[m]SWCSTRAT2634.0[m]CSTRAT2642.8[m]CSTRAT2645.0[m]SWCSTRAT2653.9[m]CSTRAT2669.0[m]CSTRAT2676.7[m]CSTRAT2677.5[m]SWCSTRAT2682.5[m]SWCSTRAT2686.0[m]DCSTRAT2695.0[m]DCSTRAT2701.0[m]DCSTRAT2707.0[m]DCSTRAT2718.0[m]SWCSTRAT2727.5[m]SWCSTRAT2734.0[m]DCSTRAT2747.0[m]SWCSTRAT2749.0[m]DCSTRAT2758.0[m]DCSTRAT2761.0[m]SWCSTRAT2773.0[m]DCSTRAT2779.0[m]DCSTRAT2785.0[m]DCSTRAT2790.7[m]SWCSTRAT2800.0[m]DCSTRAT2803.0[m]SWCSTRAT2815.0[m]DCSTRAT2818.3[m]SWCSTRAT2821.0[m]DCSTRAT2825.5[m]SWCSTRAT2830.0[m]SWCSTRAT2842.0[m]DCSTRAT2848.0[m]DCSTRAT2854.0[m]DCSTRAT2863.0[m]DCSTRAT2869.0[m]DCSTRAT2878.0[m]DCSTRAT2884.0[m]DCSTRAT2887.0[m]SWCSTRAT2899.0[m]DCSTRAT2906.5[m]SWCSTRAT2913.0[m]SWCSTRAT2916.0[m]SWCSTRAT2919.6[m]SWCSTRAT2924.5[m]SWCSTRAT2929.7[m]SWCSTRAT2938.0[m]DCSTRAT2943.9[m]SWCSTRAT2953.0[m]DCSTRAT2957.6[m]SWCSTRAT2968.0[m]DCSTRAT2973.2[m]SWCSTRAT2980.0[m]DCSTRAT2989.0[m]DCSTRAT2998.4[m]SWCSTRAT3001.0[m]DCSTRAT3010.0[m]DCSTRAT3016.0[m]DCSTRAT3022.0[m]DCSTRAT3031.0[m]DCSTRAT3034.0[m]SWCSTRAT3041.7[m]SWCSTRAT3052.0[m]DCSTRAT3058.0[m]DCSTRAT3064.0[m]DCSTRAT3072.0[m]SWCSTRAT3079.0[m]DCSTRAT3085.0[m]DCSTRAT3091.0[m]SWCSTRAT3100.0[m]DCSTRAT3106.0[m]DCSTRAT3114.5[m]SWCSTRAT3121.0[m]DCSTRAT3127.0[m]DCSTRAT3136.0[m]DCSTRAT3139.0[m]SWCSTRAT3142.0[m]SWCSTRAT3148.0[m]DCSTRAT3157.0[m]DCSTRAT3165.2[m]SWCSTRAT3169.0[m]DCSTRAT3178.0[m]DCSTRAT3182.0[m]SWCSTRAT3189.5[m]SWCSTRAT3196.5[m]SWCSTRAT3203.5[m]SWCSTRAT3213.0[m]SWCSTRAT3220.0[m]DCSTRAT3223.0[m]SWCSTRAT3232.0[m]DCSTRAT3241.0[m]DCSTRAT3247.0[m]DCSTRAT3250.0[m]DCSTRAT