30/7-8
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General information
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Wellbore history
GeneralWell 30/7-8 was drilled in the Norwegian part of the Shetland Basin. The primary objective was to test the hydrocarbon potential in the Middle Jurassic Brent group, which had previously proved gas and condensate bearing in wells 30/4-2 and 30/7-6. The Early Jurassic Cook Formation and Statfjord Group were secondary targets. The planned TD was 4600 m in the Triassic Red Beds.Operations and resultsAppraisal well 30/7-8 was spudded with the semi-submersible installation Treasure Seeker on 19 November 1980 and drilled to 4287 m in the Middle Jurassic Brent Group . The drill pipe became differentially stuck at 4069 m. After unsuccessful fishing, the well was suspended with top of the fish at 4058 m, and 4287 m became official TD for the well. The well was drilled with seawater and hi-vis pills down to 215 m, with water based "lost circulation mud" from 215 m to 962 m, with gypsum/lignosulphonate mud from 962 m to 2648 m, with a bentonite/lignosulfonate/lignite mud type from 2648 m to TD.Frequent traces of oil shows were described in many intervals from 1820 m and down to well TD. Most of the shows occurred in limestone stringers and were rated poor. The primary target Middle Jurassic (Bathonian-Bajocian) Brent Group reservoir was encountered at 4066 m. The shows in the Brent Group sandstones were rated good.Five cores were cut in the well. One was cut in the Draupne Formation from 3888.5 m, while the other four were cut in the Brent Group reservoir section from 4082.3 m to 4129.3 m. No fluid sample was taken.The well was suspended on 4 April 1980 as a gas/condensate appraisal well.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]220.004813.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13888.53898.4[m ]24082.34096.0[m ]34100.84107.6[m ]44111.04125.7[m ]54126.04128.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]48.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1250.0[m]DCGEOCH1280.0[m]DCGEOCH1310.0[m]DCGEOCH1340.0[m]DCGEOCH1370.0[m]DCGEOCH1400.0[m]DCGEOCH1430.0[m]DCGEOCH1460.0[m]DCGEOCH1490.0[m]DCGEOCH1520.0[m]DCGEOCH1550.0[m]DCGEOCH1580.0[m]DCGEOCH1610.0[m]DCGEOCH1640.0[m]DCGEOCH1670.0[m]DCGEOCH1700.0[m]DCGEOCH1730.0[m]DCGEOCH1760.0[m]DCGEOCH1790.0[m]DCGEOCH1820.0[m]DCGEOCH1850.0[m]DCGEOCH1880.0[m]DCGEOCH1910.0[m]DCGEOCH1940.0[m]DCGEOCH1970.0[m]DCGEOCH2000.0[m]DCGEOCH2030.0[m]DCGEOCH2060.0[m]DCGEOCH2090.0[m]DCGEOCH2120.0[m]DCGEOCH2150.0[m]DCGEOCH2180.0[m]DCGEOCH2210.0[m]DCGEOCH2240.0[m]DCGEOCH2270.0[m]DCGEOCH2300.0[m]DCGEOCH2330.0[m]DCGEOCH2340.0[m]DCGEOCH2350.0[m]DCGEOCH2980.0[m]DCIKU2990.0[m]DCIKU3160.0[m]DCIKU3170.0[m]DCIKU3315.0[m]DCIKU3365.0[m]DCIKU3385.0[m]DCIKU3405.0[m]DCIKU3425.0[m]DCIKU3445.0[m]DCIKU3465.0[m]DCIKU3485.0[m]DCIKU3490.0[m]DCIKU3495.0[m]DCIKU3500.0[m]SWCIKU3505.0[m]DCIKU3520.0[m]DCIKU3525.0[m]SWCIKU3534.0[m]SWCIKU3540.0[m]DCIKU3543.0[m]SWCIKU3560.0[m]DCIKU3567.0[m]SWCIKU3570.0[m]DCIKU3573.0[m]DCIKU3576.0[m]SWCIKU3586.0[m]SWCIKU3592.0[m]SWCIKU3597.0[m]SWCIKU3600.0[m]DCIKU3603.8[m]SWCIKU3616.0[m]SWCIKU3617.0[m]SWCIKU3620.0[m]DCIKU3634.0[m]SWCIKU3640.0[m]DCIKU3647.8[m]SWCIKU3659.0[m]SWCIKU3660.0[m]DCIKU3667.0[m]SWCIKU3670.0[m]DCIKU3670.0[m]SWCIKU3676.0[m]SWCIKU3678.0[m]DCIKU3679.0[m]SWCIKU3680.0[m]DCIKU3692.0[m]DCIKU3695.0[m]SWCIKU3697.0[m]SWCIKU3698.0[m]DCIKU3705.0[m]DCIKU3705.0[m]SWCIKU3708.0[m]DCIKU3710.0[m]SWCIKU3715.0[m]SWCIKU3718.0[m]DCIKU3718.0[m]SWCIKU3728.0[m]SWCIKU3728.0[m]DCIKU3734.0[m]SWCIKU3741.0[m]DCIKU3741.0[m]SWCIKU3763.0[m]DCIKU3783.0[m]DCIKU3795.0[m]SWCIKU3800.0[m]SWCIKU3800.0[m]DCIKU3805.0[m]DCIKU3808.0[m]DCIKU3810.0[m]DCIKU3813.8[m]DCIKU3815.0[m]DCIKU3820.0[m]DCIKU3825.0[m]DCIKU3830.0[m]DCIKU3830.0[m]SWCIKU3835.0[m]DCIKU3838.5[m]SWCIKU3840.0[m]DCIKU3841.0[m]SWCIKU3845.5[m]SWCIKU3862.0[m]SWCIKU3863.0[m]DCIKU3870.0[m]SWCIKU3875.0[m]SWCIKU3888.8[m]CIKU3889.4[m]CIKU3891.8[m]CIKU3892.0[m]CSNEA3893.5[m]CIKU3896.2[m]CIKU3897.3[m]CIKU3915.0[m]SWCIKU3920.0[m]DCIKU3940.0[m]DCIKU3940.0[m]SWCIKU3946.0[m]SWCIKU3960.0[m]DCIKU3960.0[m]SWCIKU3980.0[m]DCIKU3994.0[m]SWCIKU3999.0[m]SWCIKU4000.0[m]DCIKU4000.0[m]SWCIKU4015.0[m]SWCIKU4020.0[m]DCIKU4035.0[m]SWCIKU4040.0[m]DCIKU4055.0[m]DCIKU4063.0[m]DCIKU4068.0[m]DCIKU4082.3[m]CIKU4087.5[m]CIKU4096.0[m]CIKU4105.6[m]CIKU4111.3[m]CSNEA4112.0[m]CSNEA4114.9[m]CSNEA4115.2[m]CIKU4118.6[m]CSNEA4121.4[m]CIKU4123.0[m]DCIKU4123.3[m]CSNEA4127.9[m]CIKU4143.0[m]DCIKU4163.0[m]DCIKU4175.0[m]DCIKU4188.0[m]DCIKU4208.0[m]DCIKU4228.0[m]DCIKU4250.0[m]DCIKU4268.0[m]DCIKU4275.0[m]DCIKU4285.0[m]DCIKU -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit128442970178219271927195220202090227523283799380738074066 -
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]pdf3.26pdf28.57pdf28.57 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST9604052CYBERDIP26334049DIR37214189FDC CNL9604170HDT26334049ISF SON2154187ISF SON FDC CNL9612646MWD TELECO36293736RFT40674068TEMP1253726VELOCITY9704050 -
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 typeCONDUCTOR30215.036215.00.00LOTSURF.COND.20962.0261011.01.52LOTINTERM.13 3/82633.017 1/22648.01.83LOTINTERM.8 5/83726.012 1/43741.02.08LOTOPEN HOLE4287.08 3/84287.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9521.40Waterbased10171.08Waterbased15721.12Waterbased23461.26Waterbased26481.40Waterbased26541.51Waterbased32051.63Waterbased35761.40Waterbased36111.69Waterbased36762.03Waterbased37411.76Waterbased38072.03Waterbased38881.96Waterbased40382.04Waterbased40821.99Waterbased40942.09Waterbased45892.04Waterbased48122.04Waterbased -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit4067.50[m ]4079.15[m ]4064.50[m ] -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.18