2/5-12
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General information
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Wellbore history
GeneralWell 2/5-12 is located ca 15 km northeast of the TOR field on the Steinbit Terrace in the Central Graben. The objective of drilling well 2/5-12 was to test the hydrocarbon potential of the Upper Jurassic section within a four-way dip closure. A thick wedge of Jurassic deposits was identifiable from seismic. Mapping suggested the reason for the thickened section was due to an influx of sand from the shelf to the northeast. The primary target horizons were the R 1 and R 2 units within the Upper Jurassic Farsund Formation. These were thought to be lateral equivalents of the Gyda Sandstone seen in wells 2/2-1 and 2/2-4. The reservoir was thought to be sealed by Upper Jurassic shales. The four-way dip closure was formed during the Late Cretaceous to Palaeocene by inversion of a Jurassic fault. Subsequently it was covered by Palaeocene and younger post-rift sag sediments. The structure onlaps Late Cretaceous shales and chalks.Operations and resultsWildcat well was spudded with the jack-up installation Transocean Nordic on 24 November 2001 and drilled to TD in the Late Jurassic Farsund Formation. The well was drilled with seawater and gel sweeps down to 954 m, with KCl/Glycol mud from 954 m to 2381 m, and with XP07 oil based mud from 2381 m to TD. The well proceeded generally as planned without any really major problems. Data acquisition went according to plan with the exception of the 17.5" wire line logging run, which had to be dropped due to severe well bore stability problems.All the easily identifiable lithostratigraphic tops and log markers came in deeper than prognosed by circa 60 m. The prognosed sandstone reservoirs in R1 and R2 were absent. Shows were recorded in claystones of the Mandal and Farsund Formations. Pore pressures in the Tertiary were higher than prognosed, but were as prognosed in the Cretaceous and in line with expectations in the Jurassic. Drilling terminated 71 m above planned TD when the kick margin was lost. No cores were cut and no fluid samples were taken. At this point the whole of the R1 unit and the better part of the R2 unit had been drilled fulfilling the well objectives. The well was permanently abandoned on 22 February 2002 as a dry 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]180.002400.00 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3689.0[m]DCGEOLAB3692.0[m]DCGEOLAB3695.0[m]DCGEOLAB3698.0[m]DCGEOLAB3701.0[m]DCGEOLAB3704.0[m]DCGEOLAB3713.0[m]DCGEOLAB3719.0[m]DCGEOLAB3725.0[m]DCGEOLAB3740.0[m]DCGEOLAB3743.0[m]DCGEOLAB3746.0[m]DCGEOLAB3752.0[m]DCGEOLAB3755.0[m]DCGEOLAB3758.0[m]DCGEOLAB3761.0[m]DCGEOLAB3764.0[m]DCGEOLAB3770.0[m]DCGEOLAB3773.0[m]DCGEOLAB3776.0[m]DCGEOLAB3779.0[m]DCGEOLAB3782.0[m]DCGEOLAB3788.0[m]DCGEOLAB3791.0[m]DCGEOLAB3794.0[m]DCGEOLAB3797.0[m]DCGEOLAB3800.0[m]DCGEOLAB3806.0[m]DCGEOLAB3809.0[m]DCGEOLAB3812.0[m]DCGEOLAB3816.0[m]DCGEOLAB3819.0[m]DCGEOLAB3824.0[m]DCGEOLAB3827.0[m]DCGEOLAB3830.0[m]DCGEOLAB3833.0[m]DCGEOLAB3836.0[m]DCGEOLAB3839.0[m]DCGEOLAB3842.0[m]DCGEOLAB3845.0[m]DCGEOLAB3851.0[m]DCGEOLAB3854.0[m]DCGEOLAB3857.0[m]DCGEOLAB3860.0[m]DCGEOLAB3863.0[m]DCGEOLAB3866.0[m]DCGEOLAB3869.0[m]DCGEOLAB3872.0[m]DCGEOLAB3875.0[m]DCGEOLAB3878.0[m]DCGEOLAB3881.0[m]DCGEOLAB3884.0[m]DCGEOLAB3887.0[m]DCGEOLAB3890.0[m]DCGEOLAB3893.0[m]DCGEOLAB3899.0[m]DCGEOLAB3902.0[m]DCGEOLAB3905.0[m]DCGEOLAB3908.0[m]DCGEOLAB3911.0[m]DCGEOLAB3914.0[m]DCGEOLAB3917.0[m]DCGEOLAB3920.0[m]DCGEOLAB3923.0[m]DCGEOLAB3926.0[m]DCGEOLAB3929.0[m]DCGEOLAB3932.0[m]DCGEOLAB3935.0[m]DCGEOLAB3938.0[m]DCGEOLAB3941.0[m]DCGEOLAB3944.0[m]DCGEOLAB3950.0[m]DCGEOLAB3953.0[m]DCGEOLAB3956.0[m]DCGEOLAB3959.0[m]DCGEOLAB3962.0[m]DCGEOLAB3965.0[m]DCGEOLAB3968.0[m]DCGEOLAB3971.0[m]DCGEOLAB3974.0[m]DCGEOLAB3977.0[m]DCGEOLAB3980.0[m]DCGEOLAB3983.0[m]DCGEOLAB3986.0[m]DCGEOLAB3989.0[m]DCGEOLAB3992.0[m]DCGEOLAB3995.0[m]DCGEOLAB3998.0[m]DCGEOLAB4001.0[m]DCGEOLAB4004.0[m]DCGEOLAB4007.0[m]DCGEOLAB4010.0[m]DCGEOLAB4013.0[m]DCGEOLAB4016.0[m]DCGEOLAB4019.0[m]DCGEOLAB4022.0[m]DCGEOLAB4025.0[m]DCGEOLAB4031.0[m]DCGEOLAB4034.0[m]DCGEOLAB4037.0[m]DCGEOLAB4040.0[m]DCGEOLAB4043.0[m]DCGEOLAB4046.0[m]DCGEOLAB4052.0[m]DCGEOLAB4055.0[m]DCGEOLAB4058.0[m]DCGEOLAB4061.0[m]DCGEOLAB4064.0[m]DCGEOLAB4067.0[m]DCGEOLAB4073.0[m]DCGEOLAB4076.0[m]DCGEOLAB4079.0[m]DCGEOLAB4082.0[m]DCGEOLAB4085.0[m]DCGEOLAB4088.0[m]DCGEOLAB4091.0[m]DCGEOLAB4094.0[m]DCGEOLAB4097.0[m]DCGEOLAB4100.0[m]DCGEOLAB4106.0[m]DCGEOLAB4112.0[m]DCGEOLAB4115.0[m]DCGEOLAB4118.0[m]DCGEOLAB4121.0[m]DCGEOLAB4124.0[m]DCGEOLAB4127.0[m]DCGEOLAB4130.0[m]DCGEOLAB4133.0[m]DCGEOLAB4136.0[m]DCGEOLAB4139.0[m]DCGEOLAB4142.0[m]DCGEOLAB4144.0[m]DCGEOLAB4151.0[m]DCGEOLAB4153.5[m]DCGEOLAB -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9820925126532733847557068717372941294129622986306630873091309530953216352736913691370037003703 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.47 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf7.15 -
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].pdf8.55.pdf29.33 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]GR ZO-VSP16433728MFC GR113560MWD - DIR97174MWD - DIR174970MWD - DIR DGR EWR41741014MWD - DIR DGR EWR4 BAT PWD DDR37304153MWD - DIR DGR EWR4 PWD9703565MWD - DIR DGR EWR4 PWD DDS35653730TTRM GR ZDEN CN MAC18762757TTRM GR ZDEN CN MAC26013727 -
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 typeCONDUCTOR32170.036170.00.00LOTINTERM.18 5/8954.026960.01.80LOTINTERM.13 3/82381.017 1/22383.01.71LOTPROD.9 5/83720.012 1/43725.02.10LOTOPEN HOLE4153.08 1/24153.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1731.034.0SPUD MUD9691.2025.0KCL/GLYCOL13000.1420.0KCL/GLYCOL18390.1722.0KCL/GLYCOL21530.1923.0KCL/GLYCOL23580.1924.0KCL/GLYCOL24000.2034.0KCL/GLYCOL32181.7329.0XP07 POBM36371.7324.0XP07 POBM37301.7123.0XP07 POBM38421.8633.0XP07 POBM40051.9037.0XP07 POBM41451.9745.0XP07 POBM41532.0050.0XP07 POBM41531.04SEAWATER