6506/12-3
Export: PDF
-
General information
-
Wellbore history
GeneralWildcat well 6506/12-3 is a replacement well for 6506/12-2, which was abandoned at 955 m due to technical problems. The new well was designed to test the hydrocarbon potential of the Beta structure in the southeast part of theblock. The main object was Middle Jurassic sandstones, secondary targets were possible Cretaceous sands, Early Jurassic sandstones and sandstones within the Coal Beds.Operations and resultsWell 6506/12-3 was spudded with the semi-submersible installation Ross Isle, 47 m from the junked well 6506/12-2. It was spudded on 2 March 1985 and drilled to TD at 4360 m in the Early Jurassic Tilje Formation (formerly called the Aldra Formation). No significant technical problems occurred during the operations. From 0600 hours on 15 June, during the testing phase, the rig was on strike for 13 days. The well was drilled with seawater/gel down to 955 m, with gypsum/lignosulphonate mud from 955 m to 3831 m, and with gel/lignosulphonate mud from 3831 m to TD. The shallow gas present at 572 m in 6506/12-2 was not encountered in 6506/12-3.Top Middle Jurassic Garn Formation (formerly Tomma Formation) came in at 3822 m, 80 m above the prognosis. The Early Jurassic Tilje Formation sandstone (Aldra Formation) came in at 4147 m. Hydrocarbons were encountered both in the Middle and the Early Jurassic sandstones, with a hydrocarbon/water contact at 4216 m in the Tilje Formation. Late Cretaceous Lysing sandstones at the top of the Cromer Knoll Group (Finnvær Group) was also hydrocarbon bearing. A total of 242 m of hydrocarbon bearing sands was proven. Shows were only recorded in association with the hydrocarbon bearing sections.A total of 289 m core was recovered in 15 cores from the Garn, Not, Ile, Ror, and Tilje Formations between 3836 and 4269 m. Six RFT runs were completed in the Early - Middle Jurassic section in well 6506/12-3. A total of 47 pressure tests gave reliable results. In addition, segregated fluid samples were collected at 3863 m, 4231 m, 4308.1 m, and 4310.9 m.The well was permanently abandoned on 17 July as an oil/condensate/gas discovery.TestingSix DST tests were performed:DST 1 at 4222 - 4241 m in the Tilje Formation flowed 742 Sm3 light oil and 373300 Sm3 gas /day through a 22.2 mm choke. The GOR was 503 Sm3/Sm3, the oil density was 0.802 g/cm3 and the gas gravity was 0.847 (air = 1). The DST temperature was 150 deg C.DST 2 at 4165 - 4170 m in the Tilje Formation flowed 53.8 Sm3 light oil and 66800 Sm3 gas /day through a 25.4 mm choke. The GOR was 1241 Sm3/Sm3, the oil density was 0.820 g/cm3 and the gas gravity was 0.907 (air = 1). The DST temperature was 143.8 deg C.DST 3 at 3960 - 3980 m in the Ile Formation flowed 328.9 Sm3 condensate and 453100 Sm3 gas /day through a 31.8 mm choke. The GOR was 1378 Sm3/Sm3, the oil density was 0.787 g/cm3 and the gas gravity was 0.745 (air = 1). The DST temperature was 143.4 deg C.DST 4 at 3880 - 3890 m in the Garn Formation flowed 777.3 Sm3 light oil and 396500 Sm3 gas /day through a 23.8 mm choke. The GOR was 510 Sm3/Sm3, the oil density was 0.820 g/cm3 and the gas gravity was 0.764 (air = 1). The DST temperature was 141.8 deg C.DST 5 at 3822 - 3836 m in the topmost Garn Formation flowed 156.2 Sm3 oil and 37600 Sm3 gas /day through a 12.7 mm choke. The GOR was 241 Sm3/Sm3, the oil density was 0.830 g/cm3 and the gas gravity was 0.787 (air = 1). The DST temperature was 141 deg C.DST 6 at 3162 - 3173 m in the Lysing Formation flowed 582.7 Sm3 light oil, 712.2 m3 water, and 109600 Sm3 gas /day through a 19.1 mm choke. The GOR was 188 Sm3/Sm3, the oil density was 0.807 g/cm3 and the gas gravity was 0.780 (air = 1). This was the only test with water production. -
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]950.004360.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13836.03845.5[m ]23845.53855.0[m ]33855.03864.2[m ]43864.23882.6[m ]53884.03911.2[m ]63911.23926.0[m ]73949.03977.0[m ]83977.04003.0[m ]94004.04017.9[m ]104116.04144.0[m ]114144.04170.0[m ]124170.04197.5[m ]134197.54221.5[m ]144221.54249.5[m ]154249.54268.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]308.5Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 availableDSTDST14222.004241.0021.05.1985 - 23:20YESDSTDST24143.004148.0028.05.1985 - 00:30YESDSTDST33960.003980.0004.06.1985 - 01:30YESDSTDST43880.003890.0010.06.1985 - 00:00YESDSTDST53822.003836.0003.07.1985 - 10:10YESDSTDST63162.003173.0008.07.1985 - 16:40YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit32332313881982198222142214227823363146314631733709370937213822382239083947399739974147 -
Geochemical information
-
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]pdf23.72pdf2.73 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.04222424125.42.04165417025.43.03960398025.44.03881389028.65.0382238369.56.03162317332.06.13162317315.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.083.0001202.010.0001203.07.0001184.09.0001215.07.00023.0001206.014.00040.0006.1128.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.08203720000.8100.8034542.054680000.8200.90712643.02974450000.7950.75515004.07904160000.8200.7655265.0100290000.8300.7972906.092280000.7850.7973046.1329570000.8140.797173 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CCL GR3472236CBL VDL CCL GR23903797CBL VDL CCL GR36594287CEQL36594298CST22813824CST40784351DIL LSS GR38104359DLL MSFL GR SP38094357ISF LSS MS SP GR9403830LDL CNL NGT GR22364362LDL GR9402249MWD - GR RES DIR9404358NGS22364362RFT GR38403961RFT GR38633863RFT GR38654335RFT GR39614208RFT GR43024306RFT GR43094343SHDT GR22364362VELOCITY6004350 -
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 typeCONDUCTOR30404.036404.00.00LOTSURF.COND.20940.026955.01.65LOTINTERM.13 3/82240.017 1/22280.01.87LOTINTERM.9 5/83809.012 1/43831.01.83LOTLINER74359.08 1/24360.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured20431.2511.07.5WATERBASED19.03.198520431.2511.07.5WATER BASED19.03.198521311.4012.07.0WATER BASED19.03.198521311.4012.07.0WATERBASED19.03.198522061.4817.010.0WATERBASED19.03.198522061.4817.010.0WATER BASED19.03.198522501.5717.010.0WATERBASED19.03.198522501.5717.010.0WATER BASED19.03.198532901.65240.07.0WATERBASED02.04.198532901.65240.07.0WATER BASED02.04.198537111.7021.06.2WATER BASED10.04.198537111.7021.06.2WATERBASED10.04.198538221.20WATER BASED17.04.198538301.7324.0WATERBASED15.04.198538301.7324.0WATER BASED15.04.198543601.1210.09.0WATER BASED07.05.1985 -
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]pdf0.24