2/4-6
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General information
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Wellbore history
GeneralWell 2/4-6 (named 2/4-5X by operator Phillips) was drilled on a structure ca six km west off the Ekofisk discovery. The objective of the well was to test the Danian and Late Cretaceous limestone, which had proved oil productive in the other wells drilled within the block 2/4.Operations and resultsWildcat well 2/4-6 was spudded with the semi-submersible installation Neptune 7 on 28 August 1970 and drilled to TD at 3411 m in the Late Cretaceous Tor Formation. The well was drilled with sweater and hi-vis mud down to 585 m, with seawater/drill aid mud from 585 m to 3107 m, and with seawater lignosulphonate mud from 3107 m to TD.The well penetrated a thick, nearly complete Tertiary succession consisting mostly of shales and claystones. A ca 50 m thick sandy sequence with gas shows was encountered at 2956 m in the uppermost Paleocene. Danian Limestone (Ekofisk Formation) was penetrated at 3110 m and Late Cretaceous limestone (Tor Formation) was encountered at 3270 m. A rich condensate and gas was tested from these formationsFive conventional cores were cut between 3120.5 and 3223.4 m in the Ekofisk Formation. No wire line fluid samples were taken.The well was permanently abandoned on 10 December 1970 as a gas and condensate discoveryTestingFive drill stem tests through perforations of the 7" liner were carried out. The following results are maximum flow after acidization:DST 1 tested the zone 3370 - 3374 m in the Tor Formation. It produced only water at a rate of 13 m3 /day. Bottom hole temperature (BHT) in the test was reported to be 136.7 deg C.DST 2 tested the intervals 3271 - 3286 m and 3295 - 3310 m in the Tor Formation. This test flowed 568 Sm3 oil /day on a 1" choke. Oil gravity was 42.8 deg API and the GOR was 452 Sm3/Sm3. The BHT was reported to be 133.9 deg C.DST 3 tested the interval 3243 - 3246 m in the lower Ekofisk Formation. It produced only water at a rate of 23 m3/day.DST 4 tested the interval 3194 - 3216 m in the Ekofisk Formation. It flowed 609 Sm3 oil /day on a 1" choke. The oil gravity was 41.3 deg API and the GOR was 364 Sm3/Sm3. The BHT was reported to be 130 deg C.
DST 5 tested the interval 3124 - 3152 m in the Ekofisk Formation. It flowed 748 Sm3 oil /day on a 1" choke. The oil gravity was 44.6 deg API and the GOR was 539 Sm3/Sm3. The BHT was reported to be 129.4 deg 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]1292.353410.71 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom110234.010265.0[ft ]210289.010319.0[ft ]310319.010349.0[ft ]410349.010409.0[ft ]510514.010564.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]61.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit93176829582958296629713091311031103270 -
Geochemical information
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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]pdf3.11pdf3.11pdf15.33pdf7.99pdf5.66pdf6.56pdf5.72pdf0.74pdf11.79 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03370337525.42.03271331025.43.03243324625.44.03195321625.45.03125315225.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01362.03.04.01305.048.00045.00045.000129Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.05682567360.8124523.04.06092216760.8193645.07474025390.804539 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR5793387CBL15243389DLL31023389FDC31023389GR91579GR30953391HDT31013389IES5793390ML MLL31023390SNP31033390VELOCITY5793387 -
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 typeCONDUCTOR30130.036130.00.00LOTSURF.COND.20578.026580.00.00LOTINTERM.13 3/81599.017 1/21600.00.00LOTINTERM.9 5/83099.012 1/43100.00.00LOTLINER73396.08 1/23396.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1300.99seawater5851.71seawa/aid10141.71seawa/aid16821.71seawa/aid31071.73seawa/aid32661.72seawa/aid