6407/7-3
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General information
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Wellbore history
GeneralWell 6407/7-3 was drilled on the northern part of the A structure of the Njord Field. The main objectives of the well were to test the hydrocarbon potential of the Ile Formation, to test the hydrocarbon potential of the Tilje Formation above the oil down to level in the Tilje Formation in well 6407/7-1, and to obtain formation pressure data to indicate the relationship between the A-north and the A-east/A-central compartments.Operations and resultsWell 6407/7-3 was spudded with the semi-submersible installation Polar Pioneer on 3 March 1988 and drilled to TD at 3222 m in the Triassic Grey Beds. At 891 m, after setting of 30" casing, gas started to stream out of the casing. It was assumed that the gas came from the bottom of the hole, since there were no previous peaks on the MWD log. Three cement plugs were set in the interval 780 - 891 m, but the gas continued to stream. A plug was then set in the interval 510 - 570 m, and the gas stream decreased. The hole was drilled up again to 525 m, where 20" casing was set, originally not a part of the program. Two zones had shallow gas, 553 - 570 m and 652 - 685 m, which was in agreement with what was assumed in the site survey. Further drilling proceeded without any significant problems. The well was drilled with spud mud down to 536 m, with gel and seawater from 536 m to 1098 m, with Newdrill/KCl/PAC from 1098 m to 3048 m, and with Newdrill/PAC.Top Jurassic was encountered at 2795 with a 12 m thick Spekk Formation overlying the Middle Jurassic Not Formation. Top of the reservoir sections was encountered at 2851 m. Light oil was encountered in two differently pressured reservoir zones. The upper reservoir was the Ile Formation from 2851 to 2867 m with a net pay of 10.8 m. The lower reservoir was the Tilje Formation and into the Åre Formation. The oil bearing interval was from 2936.5 m and down to siltstones at 3068 m with a total net pay of 50.4 m. The Åre Formation (below 3014 m) was composed of siltstones, sandstones of low porosity and stringers of claystones. It constituted a minor part of the net pay.Shows were recorded in sandstones in the Nise, Kvitnos, and Lange Formations in the intervals 2062 - 2325 m and 2487 - 2872 m. Weak shows were recorded also below the oil bearing reservoirs down to 3205 m.Fourteen cores were cut in the well. Two were cut in the interval 2852 - 2893 m and the remaining from 2937 to 3103 m. While cutting the fourth core, there was an invasion of formation fluid into the hole due to a sudden increase in pore pressure. Heavy mud was circulated into the hole, and the well was brought under control. RFT pressures were recorded and a segregated sample was taken at 2855 m. It recovered ten litres of water, a small amount of gas, and no oil.The well was permanently abandoned on 18 May 1988 as an oil appraisal.TestingThree DST tests were performed in the well. DST 1 tested the interval 3046.8 - 3067.8 m and produced 16 Sm3 oil /day through a 25.4 mm choke. The oil density was 0.831 g/cm3. The down hole temperature in the test, measured at 3003.3 m, was 116 deg C.Two tests were planned from the interval 2990 - 3014 m. DST 2A produced 527 sm3 oil and 119389 Sm3 gas /day through a 50.8 mm choke. The GOR was 227 Sm3/Sm3, the oil density was 0.809 g/cm3, the gas gravity was 0.737 (air = 1) with 1% CO2 and less than 1 ppm H2S. The down hole temperature in the test, measured at 2889.1 m, was 113.7 deg C. DST 2B was not performed because the bottom hole pressure tool was lost during test 2A and the hole had to be killed.DST 3 tested the interval 2852.1 - 2867.9 m and produced 950 Sm3 oil and 396150 Sm3 gas /day through a 25.4 mm choke. The GOR was 417 Sm3/Sm3, the oil density was 0.808 g/cm3, the gas gravity was 0.745 (air = 1) with 2% CO2 and less than 1 ppm H2S. The down hole temperature in the test, measured at 2795.5 m, was 111.9 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]560.003222.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12852.02871.7[m ]22873.02892.5[m ]32937.02946.2[m ]42946.32952.9[m ]52953.02967.6[m ]62967.02984.4[m ]72984.43012.3[m ]83012.33025.5[m ]93025.53030.6[m ]103030.63043.4[m ]113043.53069.0[m ]123069.03070.4[m ]133071.03085.0[m ]143086.03100.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]201.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableDSTDST2A2990.003014.0008.05.1988 - 00:00YESDSTDST32852.002867.0011.05.1988 - 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 typeCONDUCTOR30440.036442.00.00LOTSURF.COND.20520.026536.01.37LOTINTERM.13 3/81098.017 1/21116.01.78LOTINTERM.9 5/82731.012 1/42750.01.75LOTLINER73218.08 1/23222.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03047306825.42.02990301450.83.02852286825.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0160.8312.05271190000.8090.7372273.09503960000.8080.745417 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AMS10202748AMS27363222CBL VDL GR4501095CBL VDL GR20752730CST GR12212730CST GR27553195CST GR27553180DIL BHC GR SP4001057DIL BHC GR SP10202748DIL SDT GR SP27363225DLL MSFL SGR27363222EVA SONIC29973210EVA SONIC30803120FMS AMS GR27403226LDL CNL CAL GR10202748LDL CNL NGS CAL27363222MWD - GR RES DIR3631116MWD - GR RES DIR27533221NGS27363222RFT GR28552880RFT GR28553144RFT GR28603004SHDT GR10992749VSP7002700VSP9003150 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3553551100115211521762176218252000200020272232256325632795279528072807285128672867293730143128 -
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]pdf10.13pdf4.68 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3941.03WATER BASED03.03.19884401.03WATER BASED04.03.19884421.03WATER BASED07.03.19884801.6118.05.0WATER BASED19.05.19884800.00WATER BASED20.05.19885101.08WATER BASED08.03.19885251.05WATER BASED09.03.19885251.05WATER BASED10.03.19885361.075.07.0WATER BASED11.03.19888111.145.07.0WATER BASED14.03.19888911.03WATER BASED07.03.198811161.146.011.0WATER BASED14.03.198811161.157.012.0WATER BASED14.03.198811161.145.09.0WATER BASED15.03.198811761.5312.07.0WATER BASED16.03.198816491.6015.09.0WATER BASED17.03.198821511.6018.09.0WATER BASED18.03.198822331.6017.08.0WATER BASED21.03.198824071.6018.014.0WATER BASED21.03.198824651.6015.013.0WATER BASED21.03.198825601.6016.013.0WATER BASED22.03.198826581.6018.08.0WATER BASED24.03.198827111.6018.09.0WATER BASED24.03.198827451.6118.05.0WATER BASED19.05.198827501.6014.06.0WATER BASED25.03.198827501.6017.09.0WATER BASED28.03.198827501.6018.010.0WATER BASED28.03.198827501.6010.05.0WATER BASED28.03.198827531.5912.013.0WATER BASED29.03.198828411.4618.05.0WATER BASED05.04.198828731.4619.05.0WATER BASED06.04.198828981.4616.05.0WATER BASED06.04.198829221.6015.05.0WATER BASED16.05.198829221.6015.06.0WATER BASED16.05.198829221.6118.05.0WATER BASED16.05.198829371.4620.06.0WATER BASED06.04.198829471.4620.06.0WATER BASED06.04.198829651.5222.06.0WATER BASED06.04.198829841.5222.06.0WATER BASED06.04.198830181.5222.06.0WATER BASED06.04.198830301.5222.06.0WATER BASED07.04.198830411.6022.04.0WATER BASED02.05.198830411.6021.04.0WATER BASED03.05.198830411.6018.06.0WATER BASED05.05.198830411.6016.05.0WATER BASED06.05.198830411.6016.06.0WATER BASED09.05.198830411.6019.06.0WATER BASED13.05.198830411.6021.06.0WATER BASED10.05.198830411.6018.06.0WATER BASED04.05.198830411.6018.06.0WATER BASED09.05.198830481.5219.04.0WATER BASED08.04.198830711.5221.05.0WATER BASED11.04.198831021.5222.05.0WATER BASED11.04.198831621.5223.06.0WATER BASED11.04.198832221.5222.05.0WATER BASED12.04.198832221.5219.05.0WATER BASED14.04.198832221.5224.05.0WATER BASED15.04.198832221.5227.04.0WATER BASED19.04.198832221.5223.06.0WATER BASED19.04.198832221.5229.05.0WATER BASED19.04.198832221.5624.05.0WATER BASED20.04.198832221.5621.06.0WATER BASED22.04.198832221.6023.07.0WATER BASED22.04.198832221.6024.05.0WATER BASED27.04.198832221.6023.05.0WATER BASED27.04.198832221.6025.05.0WATER BASED27.04.198832221.6023.04.0WATER BASED27.04.198832221.6023.04.0WATER BASED29.04.198832221.6022.05.0WATER BASED02.05.198832221.5219.05.0WATER BASED13.04.198832221.5225.04.0WATER BASED19.04.198832221.6023.04.0WATER BASED02.05.1988 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1221.5[m]SWCHYDRO1292.0[m]SWCHYDRO1410.3[m]SWCHYDRO1558.3[m]SWCHYDRO1681.5[m]SWCHYDRO1729.0[m]SWCHYDRO1769.5[m]SWCHYDRO1814.8[m]SWCHYDRO1868.0[m]SWCHYDRO1900.0[m]SWCHYDRO1947.5[m]SWCHYDRO1999.6[m]SWCHYDRO2016.8[m]SWCHYDRO2078.8[m]SWCHYDRO2134.3[m]SWCHYDRO2184.5[m]SWCHYDRO2225.0[m]SWCHYDRO2267.2[m]SWCHYDRO2309.2[m]SWCHYDRO2350.5[m]SWCHYDRO2390.5[m]SWCHYDRO2449.0[m]SWCHYDRO2628.5[m]SWCHYDRO2673.0[m]SWCHYDRO2702.2[m]SWCHYDRO2730.0[m]SWCHYDRO2755.0[m]SWCHYDRO2765.0[m]SWCHYDRO2782.0[m]SWCHYDRO2790.0[m]SWCHYDRO2796.0[m]SWCHYDRO2797.0[m]SWCHYDRO2800.0[m]SWCHYDRO2805.0[m]SWCHYDRO2815.0[m]SWCHYDRO2823.0[m]SWCHYDRO2833.0[m]SWCHYDRO2837.5[m]SWCHYDRO2840.0[m]SWCHYDRO2845.0[m]SWCHYDRO2850.0[m]SWCHYDRO2852.5[m]CHYDRO2856.0[m]CHYDRO2856.8[m]CHYDRO2861.5[m]CHYDRO2868.0[m]CHYDRO2873.3[m]CHYDRO2876.0[m]CHYDRO2881.2[m]CHYDRO2887.0[m]CHYDRO2887.0[m]CHYDRO2890.0[m]CHYDRO2892.5[m]CHYDRO2915.0[m]SWCHYDRO2925.0[m]SWCHYDRO2933.0[m]SWCHYDRO2939.0[m]CHYDRO2944.0[m]CHYDRO2949.0[m]CHYDRO2953.0[m]CHYDRO2959.0[m]CHYDRO2969.2[m]CHYDRO2976.0[m]CHYDRO2984.4[m]CHYDRO2985.4[m]CHYDRO2990.0[m]CHYDRO2995.6[m]CHYDRO3010.9[m]CHYDRO3013.0[m]CHYDRO3030.6[m]CHYDRO3032.9[m]CHYDRO3035.0[m]CHYDRO3039.8[m]CHYDRO3047.4[m]CHYDRO3052.3[m]CHYDRO3064.4[m]CHYDRO3072.8[m]CHYDRO3084.7[m]CHYDRO3094.7[m]CHYDRO3108.0[m]SWCHYDRO3135.0[m]SWCHYDRO3155.0[m]SWCHYDRO3168.5[m]SWCHYDRO3180.0[m]SWCHYDRO3195.5[m]SWCHYDRO