30/11-10 A
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General information
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Wellbore history
GeneralWell 30/11-10 A was drilled as a geological sidetrack to 30/11-10 in order to appraise the Krafla discovery made by well 30/11-8 S in 2011. Krafla is located south of and close to the Krafla North discovery made by the 30/11-10 well, on the edge of the Horda Platform towards the Viking Graben. The primary objective was to reduce uncertainty in oil-in-place in Krafla and to verify communication with Krafla North. Secondary objective was to obtain high-quality fluid samples from Krafla Tarbert Formation.Operations and resultsWildcat well 30/11-10 A was kicked off from 2001 m in 30/11-10 on 28 December 2014. It was drilled with the semi-submersible installation Transocean Leader to TD at 3948 m (3696 m TVD) m in the Middle Jurassic Ness Formation. On 10 January 2015, at 3777 m in the 8 1/2" section, drilling was discontinued for 12 days due to damaged top drive and bad weather. Otherwise, no significant problem was encountered in the operations. The well was drilled with XP-07 oil based mud from kick-off to TD.Top Brent Group, Tarbert Formation was penetrated at 3610 m (3359.2 m TVD). Hydrocarbons were proven in the Tarbert Formation from 3654 m (3403 m TVD) with a main oil bearing sandstone between 3717 to 3731 m (3466 to 3480 m TVD). Pressure points and logs indicate an OWC around 3753 m (3502 m TVD). Shows were described in Tarbert and Ness formations.No cores were cut in the well. Pressures in Tarbert Formation are close to those seen in 30/11-10 Krafla North, but variable pressure measurements in Krafla North did not provide reliable gradients so communication within Tarbert between Krafla and Krafla North cannot be concluded. Pressures within the Ness Formation does not support communication between Krafla and Krafla North. MDT fluid samples were taken at 3655.5 m (oil), 3660.4 m (water), 3683.5 m (oil), 3693.5 m (oil), 3719.1 m (oil), 3764.3 m (water).The well was permanently abandoned on 13 February 2015 as an oil 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]2010.003948.00 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3547.0[m]DCPETROSTR3559.0[m]DCPETROS3571.0[m]DCPETROS3583.0[m]DCPETROS3595.0[m]DCPETROS3604.0[m]DCPETROS3607.0[m]DCPETROS3610.0[m]DCPETROS3613.0[m]DCPETROS3616.0[m]DCPETROS3619.0[m]DCPETROS3622.0[m]DCPETROS3625.0[m]DCPETROS3631.0[m]DCPETROS3640.0[m]DCPETROS3649.0[m]DCPETROS3658.0[m]DCPETROS3664.0[m]DCPETROS3676.0[m]DCPETROS3682.0[m]DCPETROS3694.0[m]DCPETROS3700.0[m]DCPETROS3709.0[m]DCPETROS3730.0[m]DCPETROS3736.0[m]DCPETROS3745.0[m]DCPETROS3751.0[m]DCPETROS3769.0[m]DCPETROS3781.0[m]DCPETROS3793.0[m]DCPETROS3805.0[m]DCPETROS3814.0[m]DCPETROS3820.0[m]DCPETROS3826.0[m]DCPETROS3832.0[m]DCPETROS3844.0[m]DCPETROS3853.0[m]DCPETROS3862.0[m]DCPETROS3868.0[m]DCPETROS3883.0[m]DCPETROS3895.0[m]DCPETROS3907.0[m]DCPETROS3919.0[m]DCPETROS3928.0[m]DCPETROS3940.0[m]DCPETROS3949.0[m]DCPETROS -
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 availableMDT3693.500.00OILYESMDT3683.500.00OILYESMDT3719.000.00OILYES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2001219421942259228223172392258226442644302434823539361036103858 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT PEX HNGS34953955CMR RCS GR34293955MDT36553719MDT36603764MDT37193719MDT MINIDST36833683MWD - ARCVIS6 TELE35323948MWD - ARCVIS8 XCEED TELE20073532MWD - GWD TELE20012001NGI SS28653955XL ROCK36543760 -
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 typeCONDUCTOR30178.436184.00.00SURF.COND.20798.226807.01.35FITPILOT HOLE1652.012 1/41652.00.00LINER9 5/83529.012 1/43532.00.003535.03535.02.15FITOPEN HOLE3948.08 1/23948.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured26541.3520.0OBM-Low ECD32711.3520.0OBM-Low ECD33231.3015.0OBM-Low ECD33231.4631.0OBM-Low ECD33311.3519.0OBM-Low ECD33901.4629.0OBM-Low ECD33901.3520.0OBM-Low ECD34781.4629.0OBM-Low ECD34891.3521.0OBM-Low ECD35321.3923.0OBM-Low ECD35321.3923.0OBM-Low ECD35321.3519.0OBM-Low ECD36891.3721.0OBM-Low ECD37701.4022.0OBM-Low ECD38811.4531.0OBM-Low ECD39491.4625.0OBM-Low ECD