6305/8-1
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General information
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Wellbore history
GeneralWell 6305/8-1 was a joint appraisal well on the Ormen Lange discovery between licences 208, 209 and 250. It was committed to test the reservoir potential of the Tertiary sequence in licence 250. The main target was a sand ("Egga Member") in the Tang Formation. The exploration objectives of the well were to appraise the 6305/5-1 Ormen Lange gas discovery, to test the hydrocarbon potential, type of hydrocarbons and seal in a secondary target Miocene Channel feature, and to improve biostratigraphic control in the area. In addition, the well was designed to provide a variety of information required for development planning of the Ormen Lange discovery.Operations and resultsAppraisal well was spudded with the semi-submersible installation Scarabeo 5 on 13 July 2000 and drilled to a total depth of 3175 m in the Late Cretaceous (Campanian & Late Santonian) Nise Formation. No problems were experienced drilling through the ooze sequence. The well was drilled with bentonite spud mud down to 942 m. A water based mud type based on NaCl brine with glycol additives was used from 942 m to TD. No potential reservoir sandstone was encountered in the Miocene channel sequence, penetrated at 1653 m. The Egga reservoir sandstone was penetrated approximately 20 m higher than prognosed at 2898 m. A gas column of approximately 20 m was penetrated in the well. Below the gas was a thin 2-5 m oil leg, which was not prognosed. The oil was confirmed by MDT sampling, and geochemical analyses indicated that the oil is sourced from a comparatively immature source rock. The gas/oil/water contact was found at 2921.5 m. The upper part of the Egga Member, from 2900 m to 2935 m, was a loose sand interbedded with thin claystone beds. The lower part of the Egga reservoir unit consisted of a more massive sand sequence down to approx. 2950 m. The Jorsalfare Formation consists of interbedded sands and mudstones. Good quality water, oil and gas samples were collected in the reservoir. The entire reservoir in the well was cored: Five cores were cut through the Våle (Egga Member) and Jorsalfare Formation sandstones from 2895 m to 2989 m. Core recovery was excellent (92 %- 100 %). Several MDT samples containing oil and gas were recovered from sampling points at 2923.5 m, 2922 m, 2919.6 m, 2914 m and 2908.2 m. MDT water samples were recovered from sampling points 2980.5 m, 2945 m and 2942.6 m. The well was plugged and abandoned as an oil and gas appraisal well on 8 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]1560.003175.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12895.02914.5[m ]22915.52943.3[m ]32943.32958.9[m ]42959.12980.3[m ]52981.02987.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]90.7Cores 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 availableMDTMDT-12942.000.00WATER12.08.2000 - 00:00YESMDT2922.000.00OIL29.08.2000 - 00:00YES -
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 typeCONDUCTOR30941.036942.00.00LOTINTERM.201544.0261550.01.40LOTINTERM.9 5/82852.012 1/42860.01.66LOTOPEN HOLE3175.08 1/23175.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR ECS HNGS28802926CMR-20029003022DSI17503172FMI HRLA HNGS28523156MDT29083010MSCT GR15621820MSCT GR28603030MWD - GR RES SON DIR9153053PEX HALS TLD HGNS28523170PWX DSI8621848VSP9001770VSP20403170 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit8628621590174517452508250825962898297629763132 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.33 -
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].pdf2.18.pdf1.03 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8671.30WATER BASED8901.30WATER BASED9421.50WATER BASED9421.30WATER BASED28951.3016.0WATER BASED29431.3016.0WATER BASED29811.3019.0WATER BASED29821.3018.0WATER BASED29891.3018.0WATER BASED30131.3019.0WATER BASED31751.3023.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1562.5[m]SWCRRI1585.0[m]DCRRI1595.0[m]DCRRI1605.0[m]SWCRRI1633.0[m]SWCRRI1655.0[m]SWCRRI1665.0[m]SWCRRI1712.0[m]SWCRRI1735.0[m]DCRRI1750.0[m]DCRRI1782.5[m]SWCRRI1800.0[m]SWCRRI1820.0[m]SWCRRI1850.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1910.0[m]DCRRI1930.0[m]DCRRI1950.0[m]DCRRI1970.0[m]DCRRI1990.0[m]DCRRI2010.0[m]DCRRI2030.0[m]DCRRI2050.0[m]DCRRI2070.0[m]DCRRI2090.0[m]DCRRI2110.0[m]DCRRI2130.0[m]DCRRI2150.0[m]DCRRI2170.0[m]DCRRI2190.0[m]DCRRI2210.0[m]DCRRI2230.0[m]DCRRI2250.0[m]DCRRI2270.0[m]DCRRI2290.0[m]DCRRI2310.0[m]DCRRI2330.0[m]DCRRI2350.0[m]DCRRI2370.0[m]DCRRI2390.0[m]DCRRI2420.0[m]DCRRI2440.0[m]DCRRI2460.0[m]DCRRI2480.0[m]DCRRI2520.0[m]DCRRI2540.0[m]DCRRI2560.0[m]DCRRI2580.0[m]DCRRI2600.0[m]DCRRI2620.0[m]DCRRI2640.0[m]DCRRI2660.0[m]DCRRI2680.0[m]DCRRI2700.0[m]DCRRI2720.0[m]DCRRI2740.0[m]DCRRI2760.0[m]DCRRI2780.0[m]DCRRI2800.0[m]DCRRI2820.0[m]DCRRI2840.0[m]DCRRI2850.0[m]DCRRI2857.0[m]DCRRI2860.0[m]SWCRRI2862.0[m]DCRRI2871.0[m]DCRRI2877.0[m]DCRRI2880.0[m]DCRRI2883.0[m]DCRRI2886.0[m]DCRRI2889.0[m]DCRRI2895.0[m]DCRRI2895.1[m]CRRI2895.9[m]CRRI2896.8[m]CRRI2897.6[m]CRRI2899.1[m]CRRI2900.1[m]CRRI2901.2[m]CRRI2903.2[m]CRRI2903.9[m]CRRI2905.6[m]CRRI2908.7[m]CRRI2909.1[m]CRRI2910.9[m]CRRI2911.5[m]CRRI2912.5[m]CRRI2915.8[m]CRRI2916.9[m]CRRI2918.7[m]CRRI2920.4[m]CRRI2920.7[m]CRRI2921.8[m]CRRI2924.4[m]CRRI2930.9[m]CRRI2935.7[m]CRRI2949.7[m]CRRI2950.0[m]CRRI2951.2[m]CRRI2952.5[m]CRRI2955.4[m]CRRI2956.5[m]CRRI2958.8[m]CRRI2959.0[m]CRRI2959.6[m]CRRI2960.0[m]CRRI2961.0[m]CRRI2961.5[m]CRRI2962.0[m]CRRI2965.6[m]CRRI2967.0[m]CRRI2971.0[m]CRRI2972.7[m]CRRI2974.6[m]CRRI2978.3[m]CRRI2981.1[m]CRRI2982.0[m]DCRRI2983.8[m]CRRI2985.0[m]DCRRI2987.4[m]CRRI2991.0[m]DCRRI2997.0[m]DCRRI3000.0[m]DCRRI3003.0[m]DCRRI3006.0[m]DCRRI3009.0[m]DCRRI3012.0[m]DCRRI3015.0[m]DCRRI3051.0[m]DCRRI3072.0[m]DCRRI3090.0[m]DCRRI3111.0[m]DCRRI3132.0[m]DCRRI3150.0[m]DCRRI3165.0[m]DCRRI3168.0[m]DCRRI3171.0[m]DCRRI3175.0[m]DCRRI -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2927.82[m ]2985.46[m ]