34/6-2 S
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General information
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Wellbore history
GeneralWell 34/6-2 S was drilled on the Garantiana prospect on the northern continuation of the Visund structure on Tampen Spur in the North Sea. The primary objectives were Early Jurassic sandstones in the Cook Formation and Statfjord Group. Secondary objectives were the Triassic Lunde Formation and sandstones in the Middle Jurassic Brent Group.Operations and resultsWell 34/6-2 S was spudded with the semi-submersible installation Borgland Dolphin on 6 August 2012 and drilled to TD at 4335 m (4081 m TVD). No significant problem was encountered in the operations. The well path was vertical down to 2900 m, and then deviated with a maximum deviation of 47° at 3880 m. The well was drilled with seawater and bentonite mud down to 1480 m, with Aqua-Drill mud from 1480 m to 2047 m, with Carbo-Sea NABM mud from 2047 m to 3948 m, and with Magmateq NABM mud from 3948 m to TD.No Brent Group sandstones were encountered in the well, only shales and siltstones of the Rannoch Formation. The Cook Formation primary target was encountered at 3654 m (3566 m TVD), top Statfjord Group at 4055 m (3871 m TVD), and top secondary target Lunde Formation at 4252 m (4017 m TVD). An oil-down-to situation was encountered at 3777 m in the Cook Formation, with a hydrocarbon column of 123 m (105 m vertical), a net/gross of 66 % and an average effective porosity and water saturation of 19 %, respectively. The Statfjord Group and Lunde Formation were water wet.Apart for shows in the Cook Formation weak oil shows were recorded at 3785 to 3795 m and 3978 to 4030 m in the Amundsen Formation, and at 4195 to 4245 m in the Statfjord Formation. No shows were reported above top Cook Formation.One 54 m core barrel was cut in the Cook Formation from 3663 m to 3717.33 m with 100 % core recovery. RCI oil samples were recovered at 3705.2 m, 3746 m, and 3768.5 m within the Cook Formation reservoir.The well was plugged back for sidetracking on 5 November 2012. It is classified as an oil discovery.TestingA drill stem test was performed from the interval 3677.2 to 3750.2 m. The test produced 670 Sm3 oil and 16500 Sm3 gas /day through a 28/64” choke. The GOR was 33 Sm3/Sm3 and the oil density was 0.871 g/cm3. The gas contained 10 ppm H2S and 7% CO2. -
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]1500.004335.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13663.03717.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]54.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableMDT0.000.00WATERNO -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit4171268132118491849187218802022203520352273320834493449353635363566356636543777378240554055409542524252 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03677375011.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0670 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]7 PACKER36393639CBL VDL SBT33063948DSL CN ZDL MREX FLEX CAL3993926DSL HDIL XMACF EIMG33104238DSL HDIL XMACF GEOEX CAL33723939GR GCI36573856GR RCI36543746GR RCI40424042GR RCI41434148GR SBT27003420GR VSP23703930MWD - DIR4771485MWD - DIR GR RES4712076MWD - DIR GR RES ECD31523160MWD - DIR GR RES FPT34323948MWD - DIR GR RES SDN FPT39484335MWD - DIR GR RES SON20763432MWD - GR RES20003948 -
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 typeCONDUCTOR30471.036473.00.00SURF.COND.201480.0261485.01.53LOTPILOT HOLE1491.09 7/81491.00.00LOTINTERM.13 3/82047.017 1/22076.01.70LOTINTERM.9 5/83425.012 1/43432.01.94LOTLINER73948.08 1/23948.02.24FITOPEN HOLE4335.064335.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured20761.4117000.0KCl/Polymer-Glycol21061.6240000.0NABM25771.6234000.0NABM32001.8260000.0NABM34321.6437000.0NABM35671.7439000.0NABM36631.7639000.0NABM37801.8254000.0NABM38001.8547000.0NABM39171.8438000.0NABM39481.8751000.0NABM39771.8548000.0NABM42131.9047000.0NABM43351.9042000.0NABM -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3675.87[m ]3678.66[m ]3679.95[m ]3685.87[m ]3687.98[m ]3696.53[m ]3716.12[m ]