7120/9-2
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General information
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Wellbore history
GeneralWildcat well 7120/9-2 is located in The Hammerfest Basin, west of the Albatross discovery, later included in the Snøhvit Discovery. The structure comprised a dome like feature transected by a few major N-S, and E-W oriented faults. The 7120/9-2 well was drilled in a crestal position on this structure and planned total depth was 5500 m in rocks of Permian/Carboniferous age. The objective of well 7120/9-2 was to test Permian reservoirs confined by Permian Marker III (4810 m ±150 m), Permian Marker II (4745 m ±50 m), and Permian Marker I (4620 m ±150 m) for hydrocarbons.Operations and resultsWell 7120/9-2 was spudded with the semi-submersible rig Treasure Scout on18 April 1984 and drilled to a total depth of 5072 m in limestones, siltstones and cherts the Permian Røye Formation. The well was drilled with Bentonite and seawater to 381 m, with KCl/Polymer mud from 381 m to 1165 m, with Lignosulfonate /Polymer mud from 3900 m to 4270 m, and with Gel/Lignosulfonate mud from 4270 m to TD. A 17 1/2" pilot hole was drilled to 1165 m, before underreaming to 26" hole. The underreamer was lost in the hole and the well was sidetracked at 1070 m. While running the 20" casing, it parted but was recovered. Before drilling the 12 1/4" hole section two cement squeeze jobs were performed due to a low leak off test. Due to lost circulation the 9 5/8" casing was set at 4270 m. Before drilling the 8 3/8" hole section a cement squeeze job was performed due to a low leak off test. Due to lost circulation the 7" liner was set at 4791 m. Two cement squeeze jobs were performed. At 5072 m lost circulation problems occurred, the well was logged and plugged back and terminated earlier than prognosed.Some of the Jurassic sandstone intervals encountered between 1970 m and 2290 m were gas bearing, with structural closure at the point where the well bore penetrated the formation. The intervals were subdivided into three units. From 1970 m to 2048.5 m (Stø Formation) there was 62 m net sand, of which 5.75 m was net pay. Calculated average porosity in the net pay was 18 %, with and average SW of 26 %. Between 2048.5 m and 2156 m (Nordmela Formation) there was 13.38 m of net sand, 9.5 m of net pay with an average calculated porosity of 17.6 % and an Sw of 33.6 %. Between 2156 m at 2290 m (Tubåen Formation) there was 79.75 m of net sand, 1.0 m of net pay with a calculated average porosity of 20.5 % and an average Sw of 39 %. The net pay was generally associated with thin sand stringers. The Triassic sandstones were also gas bearing in the interval 2290 m - 2410 m in the upper part of the Fruholmen Formation, thus indicating the existence of a trap mechanism. Net sand amounted to 16.88 m in the interval, of which 1.75 m was net pay with an average calculated porosity of 18.14 % and an average Sw of 42 %.The Permian reservoir potential was not realised. Fractured limestones and dolomites with cherts and minor elastics were encountered as the prognosed Permian Marker III at 5050 m, but extensive clastic development and reservoir potential was not f unfilled. Permian Marker II (4956 m) was penetrated and consisted, as prognosed, of limestones and siltstones whilst Permian Marker I (4806 m), was identified as being of Triassic age (Top Havert Formation) and although it acted as a seismic reflector and was visible on some logs there was no lithological change across the marker horizon.Shows on sandstones, generally due to residual oil, were found from 1970 m to 2250 m and in the interval from 2343 m to 2400 m. Geochemical analyses indicate that the well enters the oil window (%Ro = 0.6) already at 1750 m and is post mature at ca 3600 m (%Ro = 1.3). Several zones of moderate to very rich source horizons (TOC up to 16% and hydrogen index up to 500 mg/g) were detected between ca 1700 m to ca 2600 m. One core was cut from 4962 m to 4964 m below the Permian Marker II horizon. Three segregated RFT samples were taken at 1995 m (mud filtrate and oil film), 2053 m (gas and mud filtrate), and at 2381 m (gas and mud filtrate). The well was permanently abandoned on 20 October 1984 as a gas appraisal for the Albatross Discovery.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]400.005072.00 -
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 typeCONDUCTOR30378.036381.00.00LOTSURF.COND.201152.0261170.01.82LOTINTERM.13 3/82672.017 1/22688.01.91LOTINTERM.9 5/84247.012 1/44270.01.96LOTLINER74782.08 1/24796.02.21LOTOPEN HOLE5072.065072.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL10504777CST11751758CST17802296CST22992687CST26963820CST26964266CST27364165CST29204263CST38314022CST42654785CST42674790CST43854770CST48045072DLL MSFL SP GR CAL19502400DLWD3814061HDT26714262HDT47794962HDT47795072ISF LSS GR SP3805071LDT CNL CAL GR3794962LDT CNL GR47795071LDT CNL GR SP42454790NGT26714262RFT19712285RFT20532053RFT23622396RFT27393097RFT31784248SHDT11522680SHDT42454789VSP16004791VSP CHKSHT10725072 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit31638038010721072109710971847187119061965197119712048215622902552396239624245480649564956 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.99 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf1.57 -
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]pdf20.13 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3811.04WATER BASED24.04.19846351.08WATER BASED24.04.19849081.10WATER BASED24.04.198410701.23WATER BASED06.05.198411061.22WATER BASED06.05.198411531.15WATER BASED24.04.198411651.22WATER BASED30.04.198411651.22WATER BASED30.04.198411651.22WATER BASED03.05.198411651.22WATER BASED04.05.198411651.22WATER BASED30.04.198411651.22WATER BASED30.04.198411651.22WATER BASED30.04.198411651.22WATER BASED03.05.198411651.22WATER BASED04.05.198411701.26WATER BASED10.05.198411701.26WATER BASED13.05.198411701.26WATER BASED14.05.198411701.25WATER BASED15.05.198411701.25WATER BASED17.05.198411701.25WATER BASED20.05.198411701.22WATER BASED07.05.198411701.24WATER BASED09.05.198411701.24WATER BASED09.05.198411701.26WATER BASED10.05.198411701.26WATER BASED13.05.198411701.26WATER BASED14.05.198411701.25WATER BASED15.05.198411701.25WATER BASED17.05.198411701.25WATER BASED20.05.198411791.25WATER BASED20.05.198413501.25WATER BASED22.05.198414291.26WATER BASED23.05.198415451.26WATER BASED24.05.198416371.26WATER BASED25.05.198416791.25WATER BASED28.05.198418391.25WATER BASED28.05.198418991.25WATER BASED29.05.198423121.25WATER BASED05.06.198423391.2518.016.0WATER BASED05.06.198423391.25WATER BASED05.06.198423391.2518.016.0WATER BASED05.06.198423841.2519.015.0WATER BASED05.06.198423971.2519.015.0WATER BASED05.06.198424671.2520.015.0WATER BASED05.06.198424671.5517.08.0WATER BASED17.10.198424671.5517.07.0WATER BASED18.10.198424671.5517.08.0WATER BASED17.10.198424671.5517.07.0WATER BASED18.10.198424771.2551.015.0WATER BASED05.06.198425341.2522.0WATER BASED05.06.198425381.2522.014.0WATER BASED14.06.198425901.25WATER BASED14.06.198426111.2520.014.0WATER BASED15.06.198426411.25WATER BASED17.06.198426701.25WATER BASED17.06.198426881.25WATER BASED18.06.198426881.2523.0WATER BASED20.06.198426881.25WATER BASED22.06.198426881.2521.015.0WATER BASED22.06.198426881.2518.09.5WATER BASED26.06.198426881.25WATER BASED17.06.198426881.25WATER BASED18.06.198426881.2523.0WATER BASED20.06.198426881.25WATER BASED22.06.198426881.2521.015.0WATER BASED22.06.198426881.2518.09.5WATER BASED26.06.198426911.2517.08.0WATER BASED26.06.198426941.2517.08.0WATER BASED26.06.198427101.2518.010.5WATER BASED26.06.198427971.2522.011.5WATER BASED27.06.198428651.2526.012.0WATER BASED28.06.198429281.2524.010.5WATER BASED29.06.198429901.2522.010.5WATER BASED02.07.198430061.2521.110.5WATER BASED02.07.198430281.2518.012.0WATER BASED03.07.198430991.2522.011.0WATER BASED03.07.198431761.2524.014.0WATER BASED04.07.198432631.2525.010.5WATER BASED06.07.198432961.2525.013.0WATER BASED06.07.198433111.2524.015.0WATER BASED06.07.198433721.2525.014.0WATER BASED06.07.198434211.2526.015.0WATER BASED06.07.198434741.2523.014.0WATER BASED10.07.198435151.2521.013.5WATER BASED11.07.198435341.2522.113.0WATER BASED12.07.198435611.2523.013.5WATER BASED16.07.198436111.2522.014.0WATER BASED16.07.198436661.2519.012.0WATER BASED16.07.198437161.2518.011.5WATER BASED16.07.198437261.2517.011.0WATER BASED18.07.198437841.2515.011.0WATER BASED18.07.198438451.3219.012.5WATER BASED19.07.198439031.3923.012.5WATER BASED20.07.198439671.4424.012.5WATER BASED24.07.198440201.5025.010.0WATER BASED24.07.198440611.5024.011.0WATER BASED24.07.198440951.5018.010.0WATER BASED25.07.198441451.5623.011.0WATER BASED26.07.198441981.5624.010.0WATER BASED30.07.198442541.6528.011.0WATER BASED30.07.198442541.5018.08.0WATER BASED30.07.198442541.5018.08.0WATER BASED30.07.198442611.55WATER BASED30.07.198442611.5522.08.0WATER BASED30.07.198442611.55WATER BASED30.07.198442671.5523.010.0WATER BASED01.08.198442671.5524.011.0WATER BASED01.08.198442671.5524.010.0WATER BASED03.08.198442671.5524.011.0WATER BASED01.08.198442671.5524.010.0WATER BASED03.08.198442701.5517.0WATER BASED06.08.198442701.5516.07.0WATER BASED06.08.198442701.5518.09.0WATER BASED06.08.198442701.5515.07.0WATER BASED07.08.198442701.5516.07.0WATER BASED08.08.198442701.5515.08.0WATER BASED09.08.198442701.5519.06.5WATER BASED13.08.198442701.5518.06.5WATER BASED13.08.198442701.5521.08.0WATER BASED13.08.198442701.5521.08.0WATER BASED14.08.198442701.5522.08.5WATER BASED15.08.198442701.5516.07.0WATER BASED06.08.198442701.5516.07.0WATER BASED08.08.198442701.5521.08.0WATER BASED13.08.198442701.5521.08.5WATER BASED13.08.198442701.5522.010.0WATER BASED06.08.198442701.5517.0WATER BASED06.08.198442701.5518.09.0WATER BASED06.08.198442701.5515.07.0WATER BASED07.08.198442701.5515.08.0WATER BASED09.08.198442701.5521.08.5WATER BASED13.08.198442701.5519.06.5WATER BASED13.08.198442701.5518.06.5WATER BASED13.08.198442701.5521.08.0WATER BASED14.08.198442701.5522.08.5WATER BASED15.08.198442731.5520.06.0WATER BASED21.08.198442731.5518.06.0WATER BASED21.08.198442731.5518.06.0WATER BASED21.08.198442921.5719.0WATER BASED21.08.198443181.5718.06.0WATER BASED21.08.198444241.6018.06.0WATER BASED21.08.198444991.6019.06.0WATER BASED23.08.198444991.6020.06.5WATER BASED22.08.198444991.6019.06.0WATER BASED23.08.198445801.6821.06.0WATER BASED24.08.198446921.7021.07.0WATER BASED27.08.198447031.7622.07.0WATER BASED27.08.198447421.8225.06.5WATER BASED27.08.198447791.8529.07.5WATER BASED28.08.198447912.0034.09.0WATER BASED29.08.198447912.0035.07.0WATER BASED30.08.198447912.0030.05.0WATER BASED31.08.198447912.00WATER BASED04.09.198447912.0030.04.0WATER BASED10.09.198447912.004.526.0WATER BASED11.09.198447912.0029.04.5WATER BASED06.09.198447912.0035.07.0WATER BASED30.08.198447912.0030.05.0WATER BASED31.08.198447912.00WATER BASED04.09.198447912.0029.04.5WATER BASED06.09.198447912.0030.04.0WATER BASED10.09.198447912.004.526.0WATER BASED11.09.198447962.0027.04.0WATER BASED13.09.198447972.0027.04.0WATER BASED13.09.198447982.0026.04.0WATER BASED14.09.198448002.0024.03.5WATER BASED16.09.198448002.0024.03.0WATER BASED16.09.198448002.0024.03.0WATER BASED16.09.198448202.0024.03.0WATER BASED16.09.198448402.0024.04.0WATER BASED17.09.198448612.0027.06.0WATER BASED18.09.198448902.0027.05.5WATER BASED19.09.198448902.0029.04.0WATER BASED20.09.198448902.0029.04.0WATER BASED20.09.198449492.0026.05.0WATER BASED23.09.198449622.0030.04.0WATER BASED23.09.198449642.0025.04.0WATER BASED25.09.198449641.9824.03.0WATER BASED26.09.198449641.9826.03.0WATER BASED27.09.198449641.9826.03.0WATER BASED01.10.198449641.9526.03.0WATER BASED25.09.198449641.9526.03.0WATER BASED25.09.198449641.9824.03.0WATER BASED26.09.198449641.9826.03.0WATER BASED27.09.198449641.9826.03.0WATER BASED01.10.198449652.0228.03.0WATER BASED01.10.198449712.0226.03.0WATER BASED01.10.198449712.0228.03.0WATER BASED01.10.198449712.0228.03.0WATER BASED01.10.198449982.0228.03.0WATER BASED02.10.198450242.0228.03.0WATER BASED04.10.198450242.0224.03.0WATER BASED07.10.198450242.0228.03.0WATER BASED04.10.198450242.0224.03.0WATER BASED07.10.198450242.0228.03.0WATER BASED03.10.198450242.0228.03.0WATER BASED07.10.198450242.0228.03.0WATER BASED07.10.198450352.0226.03.5WATER BASED07.10.198450472.0224.03.0WATER BASED08.10.198450712.0221.03.0WATER BASED09.10.198450712.0423.03.0WATER BASED10.10.198450712.0424.03.0WATER BASED11.10.198450712.0420.02.5WATER BASED14.10.198450712.0424.03.0WATER BASED11.10.198450712.0420.02.5WATER BASED14.10.198450712.0423.03.0WATER BASED10.10.198450722.0420.03.0WATER BASED14.10.198450722.0422.03.0WATER BASED15.10.198450722.0420.03.0WATER BASED14.10.198450722.0422.03.0WATER BASED15.10.198450722.0420.03.0WATER BASED14.10.1984 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory520.0[m]DC550.0[m]DC580.0[m]DC600.0[m]DC630.0[m]DC660.0[m]DC690.0[m]DC720.0[m]DC760.0[m]DC790.0[m]DC820.0[m]DC850.0[m]DC880.0[m]DC910.0[m]DC955.0[m]DC985.0[m]DC1005.0[m]DC1035.0[m]DC1065.0[m]DC1095.0[m]DC1180.0[m]DCOD1220.0[m]DCOD1260.0[m]DCOD1300.0[m]DCOD1320.0[m]DCOD1340.0[m]DCOD1400.0[m]DCOD1420.0[m]DCOD1500.0[m]DCOD1540.0[m]DCOD1580.0[m]DCOD1620.0[m]DCOD1660.0[m]DCOD1680.0[m]DCOD1740.0[m]DCOD1800.0[m]DCOD1860.0[m]DCOD1920.0[m]DCOD1980.0[m]DCOD2020.0[m]DCOD2080.0[m]DCOD2120.0[m]DCOD2160.0[m]DCOD2200.0[m]DCOD2220.0[m]DCOD2240.0[m]DCOD2242.0[m]SWCOD2257.0[m]SWCOD2277.0[m]SWCOD2280.0[m]DCOD2293.0[m]SWCOD2296.0[m]SWCOD2300.0[m]DCOD2303.0[m]SWCOD2310.0[m]SWCOD2314.5[m]SWCOD2320.0[m]DCOD2327.0[m]SWCOD2335.0[m]SWCOD2340.0[m]DCOD2360.0[m]DCOD2364.0[m]SWCOD2380.0[m]DCOD2385.0[m]SWCOD2400.0[m]DCOD2420.0[m]DCOD2446.5[m]SWCOD2460.0[m]DCOD2475.0[m]SWCOD2497.0[m]SWCOD2500.0[m]DCOD2525.0[m]SWCOD2540.0[m]DCOD2547.0[m]SWCOD2560.0[m]DCOD2580.0[m]SWCOD2580.0[m]DCOD2600.0[m]DCOD2604.0[m]SWCOD2620.0[m]DCOD2628.0[m]SWCOD2650.0[m]SWCOD2660.0[m]DCOD2700.0[m]DCOD2734.0[m]SWCOD2740.0[m]DCOD2780.0[m]DCOD2803.0[m]SWCOD2820.0[m]DCOD2832.0[m]SWCOD2856.0[m]SWCOD2860.0[m]DCOD2887.0[m]SWCOD2900.0[m]DCOD2935.0[m]SWCOD2940.0[m]DCOD2980.0[m]DCOD2996.0[m]SWCOD3020.0[m]DCOD3034.0[m]SWCOD3060.0[m]DCOD3062.0[m]SWCOD3092.0[m]SWCOD3120.0[m]DCOD3126.0[m]SWCOD3160.0[m]DCOD3177.0[m]SWCOD3200.0[m]DCOD3201.0[m]SWCOD3236.0[m]SWCOD3240.0[m]DCOD3280.0[m]DCOD3297.0[m]SWCOD3300.0[m]DCOD3320.0[m]DCOD3322.0[m]SWCOD3327.0[m]SWCOD3354.0[m]SWCOD3360.0[m]DCOD3377.0[m]SWCOD3400.0[m]DCOD3408.0[m]SWCOD3436.0[m]SWCOD3440.0[m]DCOD3460.0[m]DCOD3466.0[m]SWCOD3480.0[m]DCOD3490.0[m]SWCOD3511.0[m]SWCOD3522.0[m]DCOD3540.0[m]DCOD3542.0[m]SWCOD3562.0[m]SWCOD3580.0[m]DCOD3596.0[m]SWCOD3600.0[m]DCOD3624.0[m]SWCOD3640.0[m]DCOD3659.0[m]SWCOD3680.0[m]DCOD3686.0[m]SWCOD3720.0[m]DCOD3724.0[m]SWCOD3760.0[m]DCOD3775.0[m]SWCOD3800.0[m]DCOD3814.0[m]SWCOD3840.0[m]DCOD3859.0[m]SWCOD3880.0[m]DCOD3885.0[m]SWCOD3920.0[m]SWCOD3943.0[m]SWCOD3960.0[m]DCOD3960.0[m]DCOD3962.0[m]SWCOD3976.0[m]SWCOD4000.0[m]DCOD4002.0[m]SWCOD4022.0[m]SWCOD4040.0[m]DCOD4046.5[m]SWCOD4075.0[m]SWCOD4080.0[m]DCOD4103.0[m]SWCOD4120.0[m]DCOD4122.0[m]SWCOD4138.0[m]SWCOD4160.0[m]DCOD4173.0[m]SWCOD4200.0[m]DCOD4204.0[m]SWCOD4232.0[m]SWCOD4254.0[m]SWCOD4260.0[m]DCOD4294.0[m]SWCOD4307.5[m]SWCOD4318.0[m]SWCOD4320.0[m]DCOD4325.0[m]SWCOD4330.0[m]SWCOD4370.0[m]SWCOD4380.0[m]DCOD4400.0[m]DCOD4420.0[m]DCOD4440.0[m]DCOD4460.0[m]DCOD4480.0[m]DCOD4485.0[m]SWCOD4505.0[m]SWCOD4520.0[m]DCOD4538.0[m]SWCOD4560.0[m]SWCOD4587.0[m]SWCOD4600.0[m]DCOD4630.0[m]SWCOD4640.0[m]DCOD4642.0[m]SWCOD4680.0[m]DCOD4699.0[m]SWCOD4720.0[m]DCOD4732.5[m]SWCOD4760.0[m]DCOD4770.0[m]SWCOD4800.0[m]DCOD4808.0[m]SWCOD4820.0[m]DCOD4840.0[m]DCOD4849.1[m]SWCOD4860.0[m]DCOD4887.1[m]SWCOD4900.0[m]DCOD4920.0[m]DCOD4934.1[m]SWCOD4940.0[m]DCOD4960.0[m]DCOD4995.0[m]SWCOD5000.0[m]DCOD5008.0[m]SWCOD5020.0[m]DCOD5040.0[m]DCOD5047.5[m]SWCOD5060.0[m]DCOD5065.0[m]SWCOD