7/7-3
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General information
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Wellbore history
Well 7/7-3 is located ca 5 km east of the UK border on the Jæren High in the North Sea. It was drilled to appraise the Late Jurassic discovery in well 7/7-2 and was designed to test seismic interpretations, reservoir thickness and properties, pressure regime, and volume of recoverable oil. The well was planned as a future injector, but since the reservoir only indicated traces of hydrocarbons it was permanently plugged.Operations and resultsWell 7/7-3 was spudded with the semi-submersible installation Deepsea Bergen on 20 April 1993 and drilled to TD at 3584 m in the Late Permian Zechstein Group. The well took 17 days more than planned to drill, mainly due to a 8,5 days downtime related to BOP repair and loss of circulation at end of 12 1/4" section. The well was drilled with seawater and hi-vis pills down to 918 m, and with ANCO 2000 mud from 918 m to 2677 m. From 2677 m to 3354 m the mud was gradually displaced to an ANCOTHERM/Bentonite system. The ANCOTHERM/Bentonite system was used from 3354 m to TD.The 7/7-3 well penetrated the Ula Formation at 3490.5 m. The siltstone and the uppermost 2 metres of the sandstone showed only weak shows and the following logging and evaluation confirmed that the sandstone did not contain any moveable hydrocarbons.Three cores were cut from 3486 m to 3516 m, from base Farsund Formation, through the Ula Formation and into the Triassic Group. Two segregated FMT fluid samples were taken at the same depth, 3497.3 m. All fluid chambers proved to contain mud filtrate and water and did not contain any hydrocarbons.The well was permanently abandoned on 4 July 1993 as dry with shows.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]930.003584.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13486.03489.3[m ]23489.33490.0[m ]33491.03516.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]29.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30164.536165.00.00LOTINTERM.20903.526905.02.00LOTINTERM.13 3/82661.017 1/22663.01.95LOTINTERM.9 5/83339.012 1/43340.02.04LOTOPEN HOLE3584.08 1/23584.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]ACL GR26613351CBL VDL GR21002661CBL VDL GR25753340COREGUN22682667COREGUN32253335COREGUN33543540DIFL ACL MLL GR CAL33403587DIFL ACL ZDL CNL GR CAL26613351DIFL ACL ZDL GR CAL9032677DIPS GR33403578FMT CHT GR34963505FMT CHT GR34970MWD - GR RES DIR1723584VSP5103547ZDL CNL GR33403587 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit106122225892589262827582796280828212821294930813264326432743281329134133413344034913491350735073567 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.46 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.19 -
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]pdf10.55 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1701.03DUMMY22.04.19936511.03DUMMY23.04.19939201.03DUMMY26.04.19939201.03DUMMY26.04.19939201.2017.06.5DUMMY26.04.19939201.03DUMMY27.04.19939401.5046.08.0WATER BASED07.05.199313501.5051.011.5WATER BASED10.05.199316651.5051.010.5WATER BASED10.05.199318501.6047.09.5WATER BASED10.05.199318501.6051.011.5WATER BASED11.05.199319821.6047.09.5WATER BASED10.05.199321801.6051.011.5WATER BASED11.05.199326771.6540.07.5WATER BASED18.05.199326771.6537.07.0WATER BASED18.05.199326771.6539.07.0WATER BASED18.05.199326771.6538.07.0WATER BASED18.05.199326771.6540.07.0WATER BASED19.05.199326771.6044.09.0WATER BASED18.05.199326771.6537.07.0WATER BASED24.05.199326941.6536.07.5WATER BASED24.05.199327891.6544.07.5WATER BASED24.05.199328361.6552.09.0WATER BASED24.05.199328941.6546.09.0WATER BASED24.05.199329301.6549.08.5WATER BASED25.05.199330051.8567.010.5WATER BASED02.06.199330291.6547.07.0WATER BASED27.05.199330541.8550.07.0WATER BASED02.06.199330941.7353.08.0WATER BASED28.05.199331161.7354.09.0WATER BASED28.05.199332371.7958.010.5WATER BASED02.06.199333541.8251.07.0WATER BASED03.06.199333541.8241.04.5WATER BASED03.06.199333541.8256.07.5WATER BASED07.06.199333541.8251.07.5WATER BASED07.06.199333541.8241.04.0WATER BASED07.06.199333541.8240.04.0WATER BASED08.06.199333541.8235.04.0WATER BASED09.06.199333541.8241.04.0WATER BASED14.06.199333541.8226.03.5WATER BASED14.06.199333541.8252.07.0DUMMY15.06.199333541.8252.06.0DUMMY15.06.199333551.8559.012.0WATER BASED02.06.199333571.8246.07.0DUMMY15.06.199333771.8747.07.5DUMMY15.06.199334351.9248.08.0DUMMY16.06.199334861.9242.07.5DUMMY17.06.199334891.9236.07.5DUMMY21.06.199335041.9233.07.0DUMMY22.06.199335181.9229.06.5DUMMY22.06.199335841.9529.08.5DUMMY22.06.199335841.9232.07.5DUMMY22.06.1993 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1500.0[m]DCMILL1520.0[m]DCMILL1540.0[m]DCMILL1560.0[m]DCMILL1580.0[m]DCMILL1600.0[m]DCMILL1620.0[m]DCMILL1640.0[m]DCMILL1660.0[m]DCMILL1680.0[m]DCMILL1700.0[m]DCMILL1720.0[m]DCMILL1740.0[m]DCMILL1760.0[m]DCMILL1780.0[m]DCMILL1800.0[m]DCMILL1820.0[m]DCMILL1840.0[m]DCMILL1860.0[m]DCMILL1880.0[m]DCMILL1900.0[m]DCMILL1920.0[m]DCMILL1940.0[m]DCMILL1960.0[m]DCMILL1980.0[m]DCMILL2000.0[m]DCMILL2020.0[m]DCMILL2040.0[m]DCMILL2055.0[m]DCMILL2070.0[m]DCMILL2090.0[m]DCMILL2110.0[m]DCMILL2140.0[m]DCMILL2150.0[m]DCMILL2170.0[m]DCMILL2190.0[m]DCMILL2205.0[m]DCMILL2220.0[m]DCMILL2235.0[m]DCMILL2250.0[m]DCMILL2268.0[m]SWCSTATO2280.0[m]SWCSTATO2295.0[m]DCMILL2310.0[m]DCMILL2325.0[m]DCMILL2340.0[m]DCMILL2355.0[m]DCMILL2370.0[m]DCMILL2385.0[m]DCMILL2400.0[m]DCMILL2415.0[m]DCMILL2430.0[m]DCMILL2445.0[m]DCMILL2460.0[m]DCMILL2475.0[m]DCMILL2490.0[m]DCMILL2505.0[m]DCMILL2520.0[m]DCMILL2535.0[m]DCMILL2550.0[m]DCMILL2565.0[m]DCMILL2580.0[m]DCMILL2591.0[m]SWCSTATO2601.0[m]SWCSTATO2615.0[m]DCMILL2630.0[m]DCMILL2646.0[m]SWCSTATO2660.0[m]DCMILL2675.0[m]DCMILL2690.0[m]DCMILL2705.0[m]DCMILL2720.0[m]DCMILL2735.0[m]DCMILL2750.0[m]DCMILL2765.0[m]DCMILL2780.0[m]DCMILL2795.0[m]DCMILL2800.0[m]DCMILL2805.0[m]DCMILL2810.0[m]DCMILL3286.0[m]SWCSTATO3301.0[m]SWCSTATO3335.0[m]SWCSTATO3350.0[m]DCMILL3370.0[m]DCMILL3385.0[m]DCMILL3400.0[m]DCMILL3412.0[m]DCMILL3413.0[m]SWCSTATO3424.0[m]DCMILL3433.0[m]DCMILL3442.0[m]DCMILL3456.5[m]SWCSTATO3459.0[m]SWCSTATO3466.0[m]SWCSTATO3471.0[m]SWCSTATO3479.5[m]SWCSTATO3481.5[m]SWCSTATO3486.1[m]CSTATO3486.2[m]CSTATO3486.3[m]CSTATO3488.0[m]SWCSTATO3489.5[m]CSTATO3495.6[m]CSTATO3498.1[m]CSTATO3553.0[m]DCMILL3571.0[m]DCMILL3584.0[m]DCMILL