6201/11-1
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General information
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Wellbore history
GeneralWell 6201/11-1 was drilled on the Albert structure as the first well on the Norwegian side of the Nordfjord Horst. The best well for correlation is expected to be UK well 211/2-1 which was terminated in rocks of possibly Rhaetian age and was dry. The primary objective for the well was to test the hydrocarbon potential in Triassic sandstones in the A prospect. A secondary objective was to test the structural closure in the Lista/Sele Formation and to acquire geological information related to remaining prospects in the block.Operations and resultsWildcat well 6201/11-1 was spudded with the Semi-submersible installation Deepsea Bergen on 13 August 1987 and drilled to TD at 3850 m in the Early Triassic Teist Formation. A 12 1/4" pilot hole was drilled with returns to seabed from 30" casing shoe to 930 m. The well started flowing water. It was plugged back and cement was dressed to 650 m. Opened to 26" hole and sat 20" casing already at 641 m. Possible source of water flow was between 650 m to 719 m, but most likely a stronger source was below 719 m. The 17 1/2" hole was drilled to 1808 m where the well kicked due to rapid pore pressure increase near section TD. The well was plugged back and 13 3/8" casing set at 1735 m. At 3384 m there was a problem with hole stability and drilling was stopped. It was decided to set 7" liner. The well was drilled with seawater and bentonite down to 479 m, with gypsum/PAC polymer mud from 479 m to 2701 m, and with gel/lignosulfonate mud from 3384 m to TD.Oil shows appeared in limestones already in the Hordaland Group at 1325 m down to 1725 m. From 1725 m in the Hordaland Group to 1970 m in the Balder Formation oil shows was recorded on claystones. Below 2000 m oil shows were recorded in sandstones. Top reservoir came in as prognosed at 2678 m and was hydrocarbon bearing. There were good oil shows on cores down to 2881 m, and the logs show possible oil saturation down to the same depth. It was difficult to evaluate the logs due to a cemented reservoir. The porosity and permeability are low, and it was hard to take RFT-measurements. Two RFT segregated samples were taken, one sample at 2716 m and one at 3187 m. Nine cores were cut in the Lunde Formation, five in the interval 2701 m to 2785 m, and four from 2822 m to 2917.5 m. The well was permanently abandoned as an oil discovery on 6 November 1987.TestingThree drill stem tests were performed in the Lunde Formation. DST 1 was performed in the intervals 2818 m to 2832 m and 2839 m to 2852 m; DST 2 from 2746.5 m to 2771 m and DST 3 from 2713 m to 2717 m. DST 1 and 2 did not produce to the surface. DST 3 produced ca. 91 Sm3 oil and 72600 Sm3 gas per day through a 10.3 mm choke during the main flow. Oil density was 0.835 g/cm3 and gas gravity was 0.630 (air = 1). Due to a tightly cemented reservoir, the proven resources in this hole are relatively small. -
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]680.003850.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12701.02712.3[m ]22729.02739.3[m ]32740.02765.7[m ]42767.52777.5[m ]52779.52785.0[m ]62822.02835.1[m ]72836.02846.0[m ]82853.52881.3[m ]92881.52918.6[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]150.6Cores 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 availableDSTTEST32712.602716.7030.10.1987 - 12:30YES -
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 typeCONDUCTOR30479.036481.00.00LOTSURF.COND.20641.026930.01.35LOTINTERM.13 3/81735.017 1/21808.01.60LOTINTERM.9 5/82599.012 1/42620.01.84LOTLINER73383.08 1/23384.02.30LOTOPEN HOLE3850.063850.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]3.02713271710.3Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]3.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]3.091720000.8350.630798 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR6133383CST GR17532626CST GR26552968CST GR34043822DIL BHC GR4043382DLL MSFL GR26003847LDL CNL GR4042618LDL CNL GR31013383LDL CNL GR33833849LDL CNL SGR26003072MWD - GR RES DIR4042695MWD - GR RES DIR27392814MWD - GR RES DIR29043382RFT GR26812725RFT GR26813229RFT GR27152805SHDT GR26003849TEMP4042300VSP5003380 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit404126112921776177618322031203121702678267835323628 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.64 -
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]pdf25.20 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3271.06WATER BASED18.05.19875501.305000.0WATER BASED19.08.19876501.306200.0WATER BASED20.08.19876501.15WATER BASED24.08.19876501.059999.0WATER BASED21.08.19876501.05100.0WATER BASED24.08.19876751.157500.05.6WATER BASED24.08.19877801.156100.05.1WATER BASED25.08.19879301.307000.0WATER BASED18.08.198714261.206900.05.5WATER BASED26.08.198716981.247500.05.6WATER BASED27.08.198717501.357000.07.5WATER BASED31.08.198717501.357000.05.5WATER BASED03.09.198717531.456600.04.5WATER BASED03.09.198717941.356800.06.3WATER BASED28.08.198718081.352800.06.3WATER BASED31.08.198718081.352300.34.0WATER BASED31.08.198718081.486400.07.5WATER BASED09.09.198718081.512200.04.5WATER BASED09.09.198718081.514900.05.0WATER BASED09.09.198718361.457200.05.5WATER BASED04.09.198721661.453000.06.3WATER BASED09.09.198724391.482800.06.8WATER BASED09.09.198726201.515000.05.5WATER BASED10.09.198726201.515000.04.5WATER BASED11.09.198726201.706000.06.5WATER BASED14.09.198726821.705500.06.0WATER BASED14.09.198726881.7090.04.5WATER BASED28.09.198726881.7036.04.5WATER BASED24.09.198726881.7034.05.0WATER BASED20.10.198726881.7038.04.0WATER BASED02.10.198726891.0768.04.5WATER BASED19.10.198726891.7034.05.0WATER BASED21.10.198726891.7031.04.5WATER BASED22.10.198726891.7035.06.0WATER BASED26.10.198726891.7030.05.0WATER BASED26.10.198726891.7030.05.0WATER BASED27.10.198726891.7032.05.5WATER BASED28.10.198726891.7030.010.0WATER BASED29.10.198726891.7029.08.0WATER BASED30.10.198726891.7032.05.5WATER BASED02.11.198726891.7032.05.0WATER BASED02.11.198726891.7028.04.0WATER BASED02.11.198726891.7034.05.0WATER BASED23.10.198726891.7034.05.0WATER BASED26.10.198726891.7067.04.5WATER BASED28.09.198726891.7093.05.0WATER BASED28.09.198726891.7038.05.0WATER BASED29.09.198726891.7038.05.0WATER BASED30.09.198726891.7039.05.0WATER BASED01.10.198726891.7032.05.5WATER BASED16.09.198726891.7034.04.5WATER BASED18.09.198726891.7033.04.0WATER BASED18.09.198726891.703500.03.8WATER BASED21.09.198726891.709100.04.2WATER BASED21.09.198726891.704700.07.2WATER BASED21.09.198726891.704100.04.2WATER BASED22.09.198726891.704000.03.8WATER BASED23.09.198726891.7036.05.0WATER BASED25.09.198727371.7024.04.0WATER BASED14.09.198727671.7031.03.0WATER BASED16.09.198732801.7063.04.5WATER BASED19.10.198733841.512300.03.0WATER BASED05.10.198733841.704900.07.2WATER BASED05.10.198733871.5155.03.0WATER BASED05.10.198734481.5123.04.5WATER BASED06.10.198734481.5157.04.5WATER BASED07.10.198734541.5124.05.5WATER BASED08.10.198734541.5125.04.0WATER BASED09.10.198734541.5128.04.0WATER BASED14.10.198734541.5128.06.0WATER BASED16.10.1987 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1820.0[m]DCSTAT.1831.0[m]SWCSTAT.1850.0[m]DCSTAT.1860.0[m]DCSTAT.1867.0[m]SWCSTAT.1892.5[m]SWCSTAT.1918.2[m]SWCSTAT.1940.0[m]DCSTAT.1970.0[m]DCSTAT.2010.0[m]DCSTAT.2028.5[m]SWCSTAT.2044.0[m]SWCSTAT.2061.0[m]SWCSTAT.2080.0[m]DCSTAT.2100.0[m]DCSTAT.2130.0[m]DCSTAT.2154.0[m]SWCSTAT.2170.0[m]DCSTAT.2210.0[m]DCSTAT.2230.0[m]DCSTAT.2240.0[m]DCSTAT.2252.0[m]SWCSTAT.2280.0[m]DCSTAT.2300.0[m]DCSTAT.2310.0[m]DCSTAT.2330.0[m]DCSTAT.2340.0[m]DCSTAT.2360.0[m]DCSTAT.2370.0[m]DCSTAT.2390.0[m]DCSTAT.2400.0[m]DCSTAT.2420.0[m]DCSTAT.2430.0[m]DCSTAT.2433.0[m]SWCSTAT.2450.0[m]DCSTAT.2460.0[m]DCSTAT.2527.0[m]SWCSTAT.2540.0[m]DCSTAT.2550.0[m]DCSTAT.2570.0[m]DCSTAT.2600.0[m]DCSTAT.2616.0[m]SWCSTAT.2630.0[m]DCSTAT.2640.0[m]DCSTAT.2655.0[m]SWCSTAT.2665.0[m]SWCSTAT.2675.0[m]SWCSTAT.2680.0[m]DCSTAT.2690.0[m]DCSTAT.2700.0[m]DCSTAT.2701.9[m]CSTAT.2702.5[m]CSTAT.2705.5[m]CSTAT.2709.6[m]CSTAT.2711.8[m]CSTAT.2712.2[m]CSTAT.2730.5[m]CSTAT.2736.8[m]CSTAT.2739.3[m]CSTAT.2747.0[m]CSTAT.2772.4[m]CSTAT.2793.0[m]SWCSTAT.2800.0[m]SWCSTAT.2812.0[m]SWCSTAT.2950.0[m]DCSTAT.2968.0[m]SWCSTAT.2980.0[m]DCSTAT.3010.0[m]DCSTAT.3040.0[m]DCSTAT.3070.0[m]DCSTAT.3100.0[m]DCSTAT.3130.0[m]DCSTAT.3249.0[m]DCSTAT.3264.0[m]DCSTAT.3279.0[m]DCSTAT.3294.0[m]DCSTAT.3310.0[m]DCSTAT.3324.0[m]DCSTAT.3340.0[m]DCSTAT.3370.0[m]DCSTAT.3384.0[m]DCSTAT.3480.0[m]SWCSTAT.3495.0[m]DCSTAT.3555.0[m]DCSTAT.3585.0[m]DCSTAT.3600.0[m]DCSTAT.3615.0[m]DCSTAT.3630.0[m]DCSTAT.3645.0[m]DCSTAT.3660.0[m]DCSTAT.3675.0[m]DCSTAT.3690.0[m]DCSTAT.3705.0[m]DCSTAT.3720.0[m]SWCSTAT.3750.0[m]SWCSTAT.3750.0[m]DCSTAT.3765.0[m]DCSTAT.3795.0[m]DCSTAT.3840.0[m]DCSTAT. -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2731.00[m ]2733.70[m ]2749.40[m ]2751.10[m ]2752.80[m ]2754.70[m ]2760.60[m ]2768.70[m ]2822.80[m ]2824.70[m ]2828.70[m ]2830.70[m ]2729.60[m ]2832.60[m ]2841.80[m ]2845.60[m ]2857.90[m ]2862.50[m ]2867.50[m ]2879.90[m ]2914.70[m ]2889.90[m ]