7216/11-1 S
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General information
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Wellbore history
GeneralThe objective for well 7216/11-1 S was to test the hydrocarbon potential of the A-structure in PL221. Three target horizons were defined in the Palaeogene Lower Torsk Formation (Sotbakken Group). The primary objective was to test the hydrocarbon potential of the A1 prospect, defined as a closure along the flanks of the "A1" horst block at Early Eocene & Late Palaeocene level. The secondary and tertiary objectives were to test the reservoir and hydrocarbon potential of the "A2" and "A3" prospects in the horst block further to the west. The well was originally planned as a straight vertical well east of the horst. The volumes that would be left up dip were, however, considerable. Early in the planning stage the licence therefore decided to drill the well as a deviated borehole.Operations and resultsExploration well 7216/11-1 S was spudded with the semi-submersible installation "Transocean Arctic" on 24 July 2000 and drilled deviated to TD at 4239 m (3733.2 m TVD) in Late Palaeocene sediments of the Torsk Formation. The well was drilled water based with bentonite mud down to 1004 m, and with the "GLYDRIL" mud system from 1004 m to TD. A total of 30 m gross reservoir sequence of excellent quality turbidite sandstone was penetrated in the Late Palaeocene A1 Structure. The reservoirs of the prognosed A2 and A3 prospects were not developed. No HC was encountered in the A1 Formations. No shows were observed while drilling the well. No shows were recorded at well site. After core no 1 was brought onshore and slabbed a bright blue yellow fluorescence was observed in the interval 2991 - 2991.5 m. Neither oil stain nor petroleum odour was observed on the cores. The cuttings gas log indicated an increase in wetness through the claystones above the A1 reservoir, with a maximum wetness in the top of A1. The MWD logs indicated, however, that this sequence was water bearing. Two conventional cores were cut in the Torsk Formation: Core 1 recovered claystone / sandstone from 2988.0 m - 2996.4 m, while core 2 recovered claystone / shale from 4230.0 m & 4238.0 m. One MDT (Modular formation Dynamics Tester) was carried out, but fluid samples were not taken. Due to an obstruction in hole at 2806 m MD, neither logging on wire, TLC or CST was performed in the 8 1/2" section. Thus, only MWD / LWD logs exist from this section. No fluid contacts or fluid gradients was identified from the log and pressure data. A thin gas bearing sand was however observed from density/neutron log at 2012 m. The well was permanently abandoned as a dry well on 14 September 2000.TestingNo drill stem test was performed -
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]1010.004230.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12988.02996.4[m ]24230.04238.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]16.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30507.036507.01.46LOTSURF.COND.20999.0261000.01.58LOTINTERM.13 3/81390.017 1/21437.01.58LOTINTERM.9 5/82750.012 1/42758.01.72LOTOPEN HOLE4239.08 1/24239.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST - TLC14402686CST - WIRELINE25702750MDT14351586MWD MPR - GR RES DIR3864239MWD ORD/CNN - SON DENS POR27584239PEX DSI SP9992752SWC13902750VSP11002750 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38523972397 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.67 -
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].pdf1.71.PDF8.38 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4501.3813.0WATER BASED6851.4623.0WATER BASED10041.03WATER BASED10121.30WATER BASED10941.3015.0WATER BASED13371.3816.0WATER BASED13901.3916.0WATER BASED13950.0016.0WATER BASED14371.3816.0WATER BASED16501.3914.0WATER BASED18411.4618.0WATER BASED18881.4623.0WATER BASED21951.4617.0WATER BASED24001.4618.0WATER BASED26181.4620.0WATER BASED26961.5525.0WATER BASED27581.4622.0WATER BASED27931.3013.0WATER BASED29410.0014.0WATER BASED29881.3014.0WATER BASED30110.0014.0WATER BASED31701.3115.0WATER BASED32731.4617.0WATER BASED35111.5219.0WATER BASED36041.5223.0WATER BASED38611.5224.0WATER BASED40411.5225.0WATER BASED41831.5224.0WATER BASED42301.5527.0WATER BASED42391.5525.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1450.0[m]SWCOD1550.0[m]SWCOD1640.0[m]SWCOD1700.0[m]SWCOD1760.0[m]SWCOD1820.0[m]SWCOD1880.0[m]SWCOD1940.0[m]SWCOD2000.0[m]SWCOD2000.0[m]DCOD2010.0[m]DCOD2020.0[m]DCOD2030.0[m]DCOD2040.0[m]DCOD2050.0[m]DCOD2060.0[m]DCOD2070.0[m]DCOD2080.0[m]DCOD2090.0[m]DCOD2090.0[m]SWCOD2100.0[m]DCOD2110.0[m]DCOD2120.0[m]DCOD2130.0[m]DCOD2140.0[m]DCOD2150.0[m]SWCOD2150.0[m]DCOD2160.0[m]DCOD2170.0[m]DCOD2180.0[m]SWCOD2180.0[m]DCOD2190.0[m]DCOD2200.0[m]DCOD2205.0[m]DCOD2210.0[m]DCOD2215.0[m]DCOD2220.0[m]DCOD2225.0[m]DCOD2230.0[m]DCOD2235.0[m]DCOD2240.0[m]SWCOD2240.0[m]DCOD2245.0[m]DCOD2250.0[m]DCOD2255.0[m]DCOD2255.0[m]DCOD2260.0[m]DCOD2265.0[m]DCOD2270.0[m]DCOD2275.0[m]DCOD2280.0[m]DCOD2285.0[m]DCOD2290.0[m]DCOD2295.0[m]DCOD2300.0[m]SWCOD2300.0[m]DCOD2305.0[m]DCOD2310.0[m]DCOD2315.0[m]DCOD2320.0[m]SWCOD2320.0[m]DCOD2325.0[m]DCOD2330.0[m]SWCOD2330.0[m]DCOD2335.0[m]DCOD2340.0[m]DCOD2345.0[m]DCOD2350.0[m]DCOD2355.0[m]DCOD2360.0[m]SWCOD2360.0[m]DCOD2365.0[m]DCOD2370.0[m]DCOD2375.0[m]DCOD2380.0[m]SWCOD2380.0[m]DCOD2385.0[m]DCOD2390.0[m]SWCOD2390.0[m]DCOD2395.0[m]DCOD2400.0[m]DCOD2402.0[m]SWCOD2405.0[m]DCOD2410.0[m]DCOD2415.0[m]DCOD2420.0[m]SWCOD2420.0[m]DCOD2425.0[m]DCOD2430.0[m]DCOD2435.0[m]DCOD2440.0[m]DCOD2445.0[m]DCOD2450.0[m]DCOD2455.0[m]DCOD2460.0[m]DCOD2465.0[m]DCOD2470.0[m]DCOD2475.0[m]DCOD2480.0[m]SWCOD2480.0[m]DCOD2485.0[m]DCOD2490.0[m]DCOD2495.0[m]DCOD2500.0[m]DCOD2505.0[m]DCOD2510.0[m]SWCOD2510.0[m]DCOD2515.0[m]DCOD2520.0[m]DCOD2525.0[m]DCOD2530.0[m]DCOD2535.0[m]DCOD2540.0[m]DCOD2545.0[m]DCOD2550.0[m]SWCOD2550.0[m]DCOD2555.0[m]DCOD2560.0[m]DCOD2565.0[m]DCOD2570.0[m]DCOD2575.0[m]DCOD2580.0[m]DCOD2585.0[m]DCOD2590.0[m]DCOD2595.0[m]DCOD2600.0[m]SWCOD2600.0[m]DCOD2605.0[m]DCOD2610.0[m]DCOD2615.0[m]DCOD2620.0[m]DCOD2625.0[m]DCOD2630.0[m]DCOD2635.0[m]DCOD2640.0[m]DCOD2645.0[m]DCOD2650.0[m]DCOD2655.0[m]DCOD2660.0[m]SWCOD2660.0[m]DCOD2660.0[m]DCOD2665.0[m]DCOD2670.0[m]DCOD2675.0[m]DCOD2680.0[m]DCOD2685.0[m]DCOD2690.0[m]SWCOD2690.0[m]DCOD2695.0[m]DCOD2700.0[m]DCOD2750.0[m]SWCOD -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2988.03[m ]2989.03[m ]2991.50[m ]2992.75[m ]2993.02[m ]