15/6-12
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General information
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Wellbore history
GeneralWell 15/6-12 was drilled on the McHenry prospect on the south-western tip of the Gudrun Terrace in the south Viking Graben. The main objective was to test the Hugin Formation. The secondary objectives were to test the Sleipner andSkagerrak formations. The Hugin Formation was also the main reservoir in the Dagny/Ermintrude discovery wells. The deep oil-water-contact observed in the 15/5-7 well on Dagny (3897 m TVD SS) indicated a possible spill from the Dagny/Ermintrude structure towards McHenry.Operations and resultsWildcat well 15/6-12 was spudded with the semi-submersible installation on Transocean Leader on 22 December 2010 and drilled to TD at 3930 m in the Triassic Skagerrak Formation. Shallow gas was interpreted close to the well location and a 9 7/8" pilot hole was drilled from the 30" conductor shoe to 1060 m. No shallow gas was observed. Eighteen meter of drill string was lost in the hole prior to the logging job so loggers TD is 3914 m. Otherwise no significant problem occurred in the operations. The well was drilled with sea water and hi-vis pills down to 1104 m, with Performadrill WBM from 1104 m to 2768 m, and with Low-ECD XP-07 oil based mud from 2768 m to TD.The Hugin Formation was penetrated at 3798 m. It was only 12 m thick and held a 4 m thick oil filled sandstone. The Hugin sand was prognosed to be between 10 and 100 m thick. The pressure measured in the Hugin Formation indicated no communication with the Dagny/Ermintrude discoveries to the south of 15/6-12. Otherwise there were no hydrocarbon indications apart from a 2.5 m thick limestone stringer with top at 2975 m. This limestone showed a significant resistivity increase and a decrease in density and gave a gas peak of 4.2 %, but no fluorescence was described. The secondary targets, Sleipner Formation and Skagerrak Formation were water bearing.No cores were cut. An oil sample was collected with a MDT tool at 3806.0 m. The sample was estimated to be ca 11% contaminated with OBM.The well was permanently abandoned on 9 February 2011 as an oil discovery.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]1110.003930.00 -
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 availableDST1A-1B0.000.00OIL29.01.2011 - 00:00YESMDT0.003806.00OILYES -
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 typeCONDUCTOR30199.036203.00.00LOTSURF.COND.201092.0261104.02.00LOTINTERM.142754.017 1/22768.01.65LOTINTERM.9 5/83629.012 1/43632.02.02LOTOPEN HOLE3930.08 1/23930.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]AIT GPIT PPC MSIP PPC PEX33883914MDT38053896MSCT37853900MWD - ARCVRES PP2031100MWD - ARCVRES TELE PP PD STETH11003930PPC MSIP PPC GPIT TLD20603633VSI4 VSP10003910 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1397629991298171521912191224423102341255927512751278230813517352636293629366636693669378037983798381038763876 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured8001.4135.0Performadril9001.4136.0Performadril11001.2526.0Performadril13361.2529.0Performadril23621.3539.0Performadril24061.3736.0Performadril25251.3734.0Performadril26841.3742.0Performadril26961.3742.0Performadril27651.4719.0OBM-Low ECD27651.3736.0Performadril27651.3736.0Performadril34401.4523.0OBM-Low ECD36291.5625.0OBM-Low ECD36801.8938.0OBM-Low ECD37861.8943.0OBM-Low ECD38121.8947.0OBM-Low ECD-HTHP39301.7533.0OBM-Low ECD -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3669.0[m]DC3675.0[m]DC3681.0[m]DC3687.0[m]DC3693.0[m]DC3699.0[m]DC3705.0[m]DC3711.0[m]DC3717.0[m]DC3723.0[m]DC3729.0[m]DC3735.0[m]DC3741.0[m]DC3747.0[m]DC3753.0[m]DC3759.0[m]DC3762.0[m]DC3765.0[m]DC3768.0[m]DC3771.0[m]DC3774.0[m]DC3777.0[m]DC3780.0[m]DC3783.0[m]DC3785.0[m]SWC3786.0[m]DC3789.0[m]DC3792.0[m]DC3792.5[m]SWC3795.0[m]DC3798.0[m]DC3798.5[m]SWC3801.0[m]DC3804.0[m]DC3807.0[m]DC3810.0[m]DC3816.0[m]DC3822.0[m]DC3830.0[m]DC3834.0[m]DC3840.0[m]DC3846.0[m]DC3852.0[m]DC3860.0[m]DC3866.0[m]DC3873.0[m]DC3879.0[m]DC3885.0[m]DC3891.0[m]DC