6610/7-2
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General information
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Wellbore history
GeneralWildcat well 6610/7-2 is located on the Trøndelag Platform outside Mid Norway. The primary objective of the well was to test the hydrocarbon potential of Early Jurassic and Late Triassic sandstones. Secondary objectives were to gather information about the stratigraphy and hydrocarbon potential down to approximately 4200 m.Operations and resultsWildcat well 6610/7-2 was spudded with the semi-submersible installation West Vanguard on 28 August 1983 and drilled to TD at 4215 m in the Triassic Grey Beds. Drilling operations were problematic and took 119 days more than programmed. Excessive reaming of tight spots had to be done during drilling of the 22" hole section. In all the four first hole sections a pilot hole was drilled before underreaming. Nineteen kg junk was recovered from the hole after drilling out of the 13 3/8" casing shoe. Several problems with stuck pipe occurred below 3000 m. At 3526 m the pipe was stuck and was backed off at 3315 m. A cement plug was set from 3292 to 3148 m and the hole was sidetracked from 3212 m. Severe problems with tight hole, was experienced down to 3361 m. The well was drilled with seawater and spud mud down to 701 m, with gypsum/lignosulphonate mud from 701 m to 2160 m. Due to expected salt beds below 2500 m the well was drilled with oil based mud from 2160 m to TD. The oil base used was a Norol product, "hvitolje", a low-aromatic mineral oil C13 - C20 distillate.The well encountered several sandstone bodies, the first interpreted as the Egga Informal Unit in Paleocene. Earliest Cretaceous - Late Jurassic were not present in the well. At 1487 m the Early Jurassic Båt Group was encountered with massive and porous sandstone sequence. The Triassic interval 3473 - 4218 m also had some clean sandstone, especially in the upper part. Electrical logs and RFT pressure tests, however, proved all potential reservoirs to be water bearing. Organic geochemical analyses showed that the units with the best source rock properties in this well are the shales and coals of the Early Jurassic Tilje and Åre Formations, which can be classified as rich type II/III source rocks with potential for gas and oil. However, shales in the upper 100 m of the Triassic Grey Beds also have fair to rich contents of organic matter classified as type III kerogen with some potential for gas. The well is immature down to approximately 2300 m, reaches peak oil generation maturity (0.8% Ro) at around 2900 m, while base oil window is considered at around TD in the well. Hence, the Early Jurassic coals and shales are immature in the well position. Free hydrocarbons thought to be due to migration are detected only in a siltstone sample from 1504 m in the Tilje Formation.Two cores were cut, one in the Early Jurassic sequence and one in the Grey beds close to TD. No fluid sample was taken. The sample available at the NPD is a sample of the base oil used in the drilling mud.The well was permanently abandoned on 14 March 1984 as a dry hole.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]320.004212.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11498.01507.0[m ]24180.04195.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]24.0Cores 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 availableMUD0.000.00BASE OILYES -
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 typeCONDUCTOR30321.036321.00.00LOTSURF.COND.20701.026715.01.53LOTINTERM.161450.0221465.01.78LOTINTERM.13 3/82143.017 1/22160.01.76LOTINTERM.9 5/83471.012 1/43486.02.00LOTOPEN HOLE4215.08 1/24215.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT7011464BGT7011464BGT14492159BGT14492162CBL VDL GR2591449CBL VDL GR9082143CBL VDL GR17553470CNT GR21403290CST7121460CST14701752CST17532159CST21522667CST26743478CST35054205CST35054088DLL MSFL GR SP34724215HDT GR7011466HDT GR34734217ISF SONIC MSFL SP CAL GR14492177ISF SONIC SFL SP CAL GR320713ISF SONIC SP CAL7011465ISF SONIC SP GR21774216LDL CNL CAL GR3201466LDL CNL CAL NGS14494217RFT GR14902125RFT GR35144199SHDT GR14492178TDT GR23003290VELOCITY3604210 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2572579939931039103911261166119712621262145514551487148715331726 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.91 -
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]pdf57.53pdf1.58pdf0.26pdf2.15pdf92.78pdf7.86pdf47.94pdf1.36pdf38.97 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3001.079.0WATER BASED7001.109.018.0WATER BASED7301.12WATER BASED11101.17WATER BASED11351.25WATER BASED11751.31WATER BASED12251.3217.019.0WATER BASED13001.43WATER BASED14001.4319.019.0WATER BASED14651.4012.011.0WATER BASED22601.1418.018.0WATER BASED22951.1920.015.0WATER BASED23851.1321.016.0WATER BASED25301.2022.020.0WATER BASED27951.2121.019.0WATER BASED28451.2224.020.0WATER BASED28701.2030.016.0WATER BASED28901.1919.017.0WATER BASED29201.1819.014.0WATER BASED30001.1922.014.0WATER BASED31401.2021.010.0WATER BASED32401.2117.022.0WATER BASED33551.3023.015.0WATER BASED34501.3528.017.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory712.0[m]SWCIKU712.0[m]SWCOD760.0[m]SWCOD806.0[m]SWCOD806.0[m]SWCIKU888.0[m]SWCOD888.0[m]SWCIKU938.0[m]SWCIKU938.0[m]SWCOD986.0[m]SWCOD986.0[m]SWCIKU990.0[m]DCDONG1002.0[m]SWCIKU1002.0[m]SWCOD1010.0[m]DCDONG1030.0[m]DCDONG1031.5[m]SWCIKU1047.0[m]SWCIKU1050.0[m]DCDONG1070.0[m]DCDONG1090.0[m]DCDONG1110.0[m]DCDONG1129.0[m]SWCIKU1130.0[m]DCDONG1150.0[m]DCDONG1170.0[m]DCDONG1190.0[m]DCDONG1206.0[m]SWCIKU1209.0[m]DCDONG1230.0[m]DCDONG1251.0[m]DCDONG1255.0[m]SWCIKU1263.0[m]DCDONG1270.0[m]SWCIKU1305.0[m]SWCIKU1344.0[m]SWCIKU1400.0[m]SWCIKU1435.0[m]SWCOD1435.0[m]SWCIKU1460.0[m]SWCIKU1470.0[m]SWCIKU1479.0[m]SWCOD1482.0[m]SWCOD1485.0[m]SWCIKU1521.5[m]SWCIKU1539.0[m]DCOD1560.0[m]DCOD1579.0[m]DCOD1593.0[m]DCOD1629.0[m]DCOD1629.3[m]SWCIKU1635.3[m]SWCIKU1654.5[m]SWCIKU1668.0[m]DCOD1678.0[m]SWCIKU1705.0[m]SWCIKU1707.0[m]DCOD1723.5[m]SWCIKU1746.0[m]DCOD1785.0[m]DCOD1806.0[m]DCOD1851.0[m]DCOD1910.0[m]SWCIKU1911.0[m]DCOD1938.0[m]DCOD1971.0[m]DCOD1998.0[m]DCOD2028.0[m]DCOD2061.0[m]DCOD2078.0[m]SWCIKU2091.0[m]DCOD2122.0[m]DCOD2151.0[m]DCOD2159.0[m]SWCIKU2167.0[m]SWCOD2171.0[m]DCOD2175.0[m]SWCOD2189.0[m]SWCOD2208.0[m]DCOD2223.0[m]SWCIKU2226.0[m]DCOD2244.0[m]DCOD2252.0[m]SWCOD2274.0[m]DCOD2334.0[m]DCOD2355.0[m]SWCOD2364.0[m]DCOD2377.5[m]SWCOD2392.0[m]SWCIKU2394.0[m]DCOD2430.0[m]DCOD2440.0[m]SWCIKU2440.0[m]DCDONG2446.5[m]DCOD2454.0[m]DCOD2484.0[m]DCOD2497.0[m]SWCOD2514.0[m]DCOD2541.5[m]SWCIKU2544.0[m]DCOD2574.0[m]DCOD2589.5[m]SWCIKU2604.0[m]DCOD2634.0[m]DCOD2637.0[m]SWCIKU2664.0[m]DCOD2694.0[m]DCOD2724.0[m]DCOD2749.5[m]SWCOD2784.0[m]DCOD2844.0[m]DCOD2874.0[m]DCOD2904.0[m]DCOD2994.0[m]DCOD3024.0[m]DCOD3054.0[m]DCOD3084.0[m]DCOD3114.0[m]DCOD3144.0[m]DCOD3150.0[m]SWCOD3174.0[m]DCOD3201.0[m]SWCOD3204.0[m]DCOD3221.0[m]SWCOD3234.0[m]DCOD3242.0[m]SWCOD3261.0[m]DCOD3264.0[m]DCOD3284.0[m]DCOD3294.0[m]DCOD3324.0[m]DCOD3338.0[m]SWCOD3354.0[m]DCOD3376.0[m]SWCOD3384.0[m]DCOD3414.0[m]DCOD3444.0[m]DCOD3453.5[m]SWCOD3474.0[m]DCOD3478.5[m]SWCOD3534.0[m]DCOD3564.0[m]DCOD3587.0[m]SWCOD3636.0[m]DCOD3663.0[m]DCOD3693.0[m]DCOD3717.0[m]DCOD3753.0[m]DCOD3774.0[m]DCOD3801.0[m]DCOD3840.0[m]DCOD3864.0[m]DCOD3877.0[m]SWCOD3894.0[m]DCOD3924.0[m]DCOD3951.0[m]DCOD3966.0[m]SWCIKU3984.0[m]DCOD4014.0[m]DCOD4044.0[m]DCOD4074.0[m]DCOD4104.0[m]DCOD4120.5[m]SWCOD4134.0[m]DCOD4164.0[m]DCOD4194.0[m]DCOD