15/12-9 S
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General information
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Wellbore history
GeneralWell 15/12-9 S was drilled on the Varg Field in the North Sea. The Varg Field reservoir is in Upper Jurassic sandstones at a depth of approximately 2700 metres. The Varg Field is segmented and includes several isolated compartments with varying reservoir properties. The well was drilled from a location near to the Varg A and Petrojarl A production installations and targeted a southern compartment in the Varg structure. The objective for the well was to prove hydrocarbons in Late Oxfordian sandstone and to reduce the uncertainty in the reserve estimate for this part of the Varg Field.Operations and resultsAppraisal well 15/12-9 S was spudded with the semi-submersible installation Deepsea Bergen on 17 July 1992 and drilled to TD at 3848 m (3213 m TVD) in the Triassic Skagerrak Formation. The well was drilled deviated from 623 m with a sail angle of ca 56 ° and then vertical again from ca 2400 m TVD through the target reservoir to TD. The well was drilled with seawater down to 620 m, with KCl/polymer mud from 620 mto 3226 m, and with Ancotemp/bentonite mud from 3226 m to TD.The well penetrated top reservoir, the Oxfordian sandstones, at 3385 m (2750 m TVD). The reservoir was oil-bearing down to a well-defined OWC at 3501.5 m (2867.0 m TVD). Seven cores were cut with 100% recovery. Core 1 to 6 were cut in the interval 3689 m to 3555 m and core 7 was cut from 3649.5 m to 3668.0 m. The core to log depth shift was -2.45 m for core 7; for the other cores the core depth was equal to the logger’s depth. Two segregated FMT oil samples were taken at 3498 m. Oil shows continued down to 3545mThe well is classified an oil appraisal well. It was suspended on 8 October 1992 and was later re-classified to oil production well 15/12-A-11 on the Varg Field.TestingTwo drill stem tests were performed in the Oxfordian sandstones.DST 1 tested the water zone from 3545 m to 3552 m (2910 – 2917 m). The test produced water at a rate of 890 m3/day through a 48/64” choke.DST 2 tested the oil zone from 3385 m to 3443 m (2750 – 2809 m). The test produced on average 132200 Sm3 gas and 1520 Sm3 oil /day through a 40/64” choke. The GOR was 87 Sm3/Sm3, the oil density was 0.852 g/cm3 and the gas gravity was 0.751 (air = 1) with 1.5% CO2 and 4% H2S. Maximum flowing temperature was 124.6 °C. -
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]630.003815.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13389.03416.0[m ]23416.03443.6[m ]33443.63471.0[m ]43471.33499.0[m ]53499.13527.0[m ]63527.33555.0[m ]73652.03670.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]183.8Cores 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 typeLaboratory1350.0[m]DCGEOCH1370.0[m]DCGEOCH1390.0[m]DCGEOCH1410.0[m]DCGEOCH1430.0[m]DCGEOCH1450.0[m]DCGEOCH1470.0[m]DCGEOCH1490.0[m]DCGEOCH1510.0[m]DCGEOCH1530.0[m]DCGEOCH1550.0[m]DCGEOCH1570.0[m]DCGEOCH1590.0[m]DCGEOCH1610.0[m]DCGEOCH1630.0[m]DCGEOCH1650.0[m]DCGEOCH1670.0[m]DCGEOCH1690.0[m]DCGEOCH1710.0[m]DCGEOCH1730.0[m]DCGEOCH1750.0[m]DCGEOCH1770.0[m]DCGEOCH1790.0[m]DCGEOCH1810.0[m]DCGEOCH1830.0[m]DCGEOCH1850.0[m]DCGEOCH1870.0[m]DCGEOCH1890.0[m]DCGEOCH1910.0[m]DCGEOCH1930.0[m]DCGEOCH1950.0[m]DCGEOCH1970.0[m]DCGEOCH1990.0[m]DCGEOCH2010.0[m]DCGEOCH2030.0[m]DCGEOCH2050.0[m]DCGEOCH2070.0[m]DCGEOCH2090.0[m]DCGEOCH2110.0[m]DCGEOCH2130.0[m]DCGEOCH2150.0[m]DCGEOCH2170.0[m]DCGEOCH2190.0[m]DCGEOCH2210.0[m]DCGEOCH2230.0[m]DCGEOCH2250.0[m]DCGEOCH2270.0[m]DCGEOCH2290.0[m]DCGEOCH2310.0[m]DCGEOCH2330.0[m]DCGEOCH2350.0[m]DCGEOCH2370.0[m]DCGEOCH2390.0[m]DCGEOCH2410.0[m]DCGEOCH2430.0[m]DCGEOCH2450.0[m]DCGEOCH2470.0[m]DCGEOCH2490.0[m]DCGEOCH2510.0[m]DCGEOCH2530.0[m]DCGEOCH2550.0[m]DCGEOCH2570.0[m]DCGEOCH2590.0[m]DCGEOCH2610.0[m]DCGEOCH2630.0[m]DCGEOCH2650.0[m]DCGEOCH2670.0[m]DCGEOCH2690.0[m]DCGEOCH2710.0[m]DCGEOCH2730.0[m]DCGEOCH2750.0[m]DCGEOCH2770.0[m]DCGEOCH2790.0[m]DCGEOCH2810.0[m]DCGEOCH2830.0[m]DCGEOCH2850.0[m]DCGEOCH2870.0[m]DCGEOCH2890.0[m]DCGEOCH2910.0[m]DCGEOCH2930.0[m]DCGEOCH2950.0[m]DCGEOCH2970.0[m]DCGEOCH2990.0[m]DCGEOCH3010.0[m]DCGEOCH3030.0[m]DCGEOCH3050.0[m]DCGEOCH3070.0[m]DCGEOCH3080.0[m]DCGEOCH3327.0[m]DC3371.0[m]DC3391.6[m]C3391.6[m]C3399.2[m]CSTATOIL3438.1[m]C3447.6[m]C3454.3[m]CSTATOIL3459.6[m]C3462.5[m]CSTATOIL3478.8[m]CSTATOI3490.4[m]C3509.3[m]C3526.4[m]C3554.4[m]C3654.4[m]C3661.0[m]C3661.2[m]C3669.2[m]C3707.0[m]C -
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 availableDSTDST23385.000.00OIL28.09.1992 - 17:50YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1071083140029302930294530053082309130913187326032953304330433853385362036883688 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.26pdf3.89pdf0.92 -
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]pdf1.97pdf17.64 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03545019.02.03385020.6Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0002.0100.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.015200.8520.75187 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBIL HXDIP GR33503700CBL VDL CCL GR29253789CBL VDL GR13302191CBL VDL GR24503312CCL GR29303360CST GR33183833DIFL ACL ZDL CNL GR33063844DLL MLL GR33063676FMT GR34003673HXDIP GR33063848MWD1753848VSP15703730 -
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 typeCONDUCTOR30167.036167.00.00LOTINTERM.20599.026600.01.76LOTINTERM.13 3/82207.017 1/22210.01.91LOTINTERM.9 5/83313.012 1/43315.01.87LOTLINER5 1/23846.08 1/23848.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6201.03DUMMY6201.03WATER BASED6231.3934.0DUMMY9601.3940.0DUMMY13871.3946.0DUMMY16971.3946.0DUMMY22251.3936.0WATER BASED22281.3931.0WATER BASED23331.3336.0WATER BASED24471.3931.0WATER BASED26131.5032.0WATER BASED28951.5348.0WATER BASED30351.5337.0WATER BASED31691.5339.0WATER BASED32921.5337.0WATER BASED33261.5340.0WATER BASED33301.3316.0WATER BASED33331.3327.0WATER BASED33851.3329.0WATER BASED33891.3327.0WATER BASED34431.3328.0WATER BASED34711.3325.0WATER BASED35271.3328.0WATER BASED35551.3321.0WATER BASED36101.3325.0WATER BASED36551.3332.0WATER BASED36901.3336.0WATER BASED38481.3334.0WATER BASED -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3525.70[m ]3532.10[m ]3532.70[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]pdf0.22