6407/9-1
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General information
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Wellbore history
GeneralWildcat well 6407/9-1 was drilled in the Froan Basin offshore Mid Norway. The primary objective of the well was evaluation of possible reservoirs of Early to Middle Jurassic age. Secondary objectives were evaluation of deeper reservoirs of Early Jurassic to Upper Triassic age.The well is Type Well for the Rogn Formation. It is Reference well for the Viking Group and Spekk FormationOperations and resultsWildcat well 6407/9-1 was spudded with the semi-submersible installation Borgny Dolphin on 26 June 1984 and drilled to TD at 2500 m in the Late Triassic Red Beds. Due to high deviation in the 36" hole section, the well was re-spudded. Junk was fished out of the hole before and after performing a leak off test below the 20" casing shoe. Gas bubbles were observed around the BOP stack, the 20" casing was perforated and several cement squeeze jobs were performed. The 13 3/8" casing was run just below the 20" casing. Some technical problems occurred while drilling the 12 1/4" hole. Some tight spots occurred in the two lowermost hole sections. The bottom hole assembly got stuck at 2027 m, but was successfully freed. The well was drilled with seawater and bentonite down to 809 m and with KCl/Polymer mud from 809 m to TD.The well encountered a Late Jurassic intra-Spekk Formation sandstone unit which was previously unknown in the Haltenbanken area. It has later formally been named the Rogn Formation. It was oil filled from the top at 1621 m down to an OWC at 1660 m. Tests showed light oil with a low content of gas and condensate. The underlying reservoir sandstones of Middle/Early Jurassic to Late Triassic age were all water bearing, nor were oil shows reported in any other porous section in the well. Five cores were cut from the Late Jurassic into the Middle Jurassic. The three first were cut in the Rogn Formation while the two last recovered an underlying Spekk sequence and upper part of the Garn Formation. RFT oil and water samples were successfully recovered from 1635 m and 1703 m, respectively.The well was permanently abandoned on 7 September 1984 as an oil discovery.TestingOne production test was carried out the in the interval 1632 m to 1638 m in the Rogn Formation. A maximum flow rate of 1351 Sm3/day (8500 BOPD) through a 2" choke was sustained for two days. The GOR was 38 Sm2/Sm3 (211 scf/STB), oil gravity was 40 deg API, and separator gas gravity was 0.89 (air = 1). The CO2 content was 1%, no H2S was detected. Bottom hole temperature recorded during the test was 68.3 deg C (155 deg F). -
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]410.002500.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11631.01643.2[m ]21645.01661.4[m ]31663.01670.0[m ]41670.01673.9[m ]51674.01683.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]48.5Cores 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 availableDSTDST11638.001632.0029.08.1984 - 15:00YESDSTTEST11632.001638.0029.08.1984 - 15:00YES -
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 typeCONDUCTOR30383.036395.00.00LOTSURF.COND.20799.026811.01.39LOTINTERM.13 3/8830.017 1/2840.01.42LOTINTERM.9 5/81616.012 1/41630.01.64LOTLINER72484.08 1/22500.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.01632163848.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.068Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01351513380.8200.89038 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DLL MSFL GR16121800HDT16122485ISF LSS GR273807ISF LSS GR8271597ISF LSS GR15971611ISF LSS GR16132487LDL CNL GR382809LDL CNL GR8301611LDL CNL NGT16132489RFT15992373SWS8402500VELOCITY6752485 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2732737628258251340134013771533153315631563158315911591162116701673167317461783178318391900196820732357 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.49 -
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]pdf11.09pdf1.23pdf26.94pdf2.94pdf0.44pdf4.20pdf1.09pdf1.14pdf0.33pdf0.33 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8111.03WATER BASED06.07.19848181.0219.026.0WATER BASED10.07.19848181.03WATER BASED11.07.19848181.03WATER BASED12.07.19848181.03WATER BASED16.07.19848181.03WATER BASED11.07.19848181.03WATER BASED12.07.19848181.03WATER BASED13.07.19848181.03WATER BASED16.07.19848181.03WATER BASED13.07.19848401.1115.017.0WATER BASED16.07.19848401.1115.017.0WATER BASED16.07.19848401.1018.020.0WATER BASED16.07.19849801.2517.018.0WATER BASED17.07.198413601.3020.020.0WATER BASED18.07.198415601.3120.017.0WATER BASED20.07.198416301.3323.021.0WATER BASED23.07.198416301.3124.020.0WATER BASED25.07.198416301.3422.019.0WATER BASED27.07.198416301.3523.022.0WATER BASED20.07.198416301.3523.022.0WATER BASED23.07.198416301.3324.023.0WATER BASED23.07.198416301.3323.021.0WATER BASED23.07.198416301.3322.019.0WATER BASED24.07.198416301.3124.020.0WATER BASED25.07.198416301.3420.018.0WATER BASED26.07.198416301.3422.019.0WATER BASED27.07.198416301.3523.022.0WATER BASED23.07.198416301.3324.023.0WATER BASED23.07.198416301.3322.019.0WATER BASED24.07.198416301.3420.018.0WATER BASED26.07.198416321.12WATER BASED21.08.198416321.12WATER BASED23.08.198416321.12WATER BASED27.08.198416321.12WATER BASED28.08.198416321.12WATER BASED30.08.198416321.12WATER BASED03.09.198416321.12WATER BASED23.08.198416321.12WATER BASED27.08.198416321.12WATER BASED28.08.198416321.12WATER BASED30.08.198416321.12WATER BASED31.08.198416321.12WATER BASED03.09.198416321.12WATER BASED31.08.198417471.3321.020.0WATER BASED30.07.198418311.3321.020.0WATER BASED30.07.198419561.3321.018.0WATER BASED30.07.198420691.3321.020.0WATER BASED30.07.198421251.3323.021.0WATER BASED01.08.198422561.3322.021.0WATER BASED01.08.198423671.3422.022.0WATER BASED03.08.198424651.3320.022.0WATER BASED06.08.198425001.3320.021.0WATER BASED06.08.198425001.3321.020.0WATER BASED07.08.198425001.3325.020.0WATER BASED08.08.198425001.3320.021.0WATER BASED06.08.198425001.3321.020.0WATER BASED07.08.198425001.3325.020.0WATER BASED08.08.198425001.3320.021.0WATER BASED06.08.1984 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory750.0[m]DCOD760.0[m]DCOD770.0[m]DCOD780.0[m]DCOD790.0[m]DCOD820.0[m]DCOD830.0[m]DCOD840.0[m]DCOD850.0[m]DCOD1666.8[m]C1670.0[m]C1671.7[m]C1674.3[m]C1675.0[m]C1676.3[m]C1756.0[m]DCOD1762.0[m]DCOD1777.0[m]DCOD1792.0[m]DCOD1807.0[m]DCOD1822.0[m]DCOD1837.0[m]DCOD1852.0[m]DCOD1867.0[m]DCOD1882.0[m]DCOD1897.0[m]DCOD1912.0[m]DCOD1927.0[m]DCOD1942.0[m]DCOD1957.0[m]DCOD1972.0[m]DCOD1987.0[m]DCOD2002.0[m]DCOD2017.0[m]DCOD2032.0[m]DCOD2047.0[m]DCOD2062.0[m]DCOD2077.0[m]DCOD2092.0[m]DCOD2107.0[m]DCOD2122.0[m]DCOD2137.0[m]DCOD2152.0[m]DCOD2167.0[m]DCOD2182.0[m]DCOD2197.0[m]DCOD2212.0[m]DCOD2227.0[m]DCOD2242.0[m]DCOD2257.0[m]DCOD2272.0[m]DCOD2287.0[m]DCOD2305.0[m]DCOD2320.0[m]DCOD2335.0[m]DCOD2350.0[m]DCOD2362.0[m]DCOD2377.0[m]DCOD2395.0[m]DCOD2410.0[m]DCOD2425.0[m]DCOD2440.0[m]DCOD2455.0[m]DCOD2470.0[m]DCOD