2/4-3
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General information
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Wellbore history
GeneralWell 2/4-3 (named 2/4-2X by operator Phillips) was drilled to appraise the 2/4-2 Ekofisk discovery in the southern Norwegian North Sea. The target was to test the Tertiary and the top of the Late Cretaceous.Operations and resultsWell 2/4-3 was spudded with the semi-submersible installation Ocean Viking on 27 January 1970 and drilled to TD at 3431 m in the Late Cretaceous Tor Formation. The well was planned vertical, but the deviation was significant. Maximum deviation was 1 deg at 618 m, 3 deg at 1077 m, 11.5 deg at 1316 m, 16.4 deg at 1605 m, 10 deg at 2167 m, 4 deg at 3002 m, and 1.7 deg at 3292 m. This indicates that TVD RKB is ca 30 m shallower than MD RKB at TD, but exact records are not available. The well was drilled with seawater and hi-vis mud down to 619 m, with CaCl2 / Dextrid (modified potato starch) from 619 m to 1695 m, and with lignosulphonate / seawater from 1695 m to TD. One - four percent diesel was added to the mud below 619 m.The Danian chalk (Ekofisk Formation) was encountered at 3090 m, and the Late Cretaceous chalk (Tor Formation) at 3253 m. The formations were tested hydrocarbon bearing from 3124 m to 3319 m.Eighteen conventional cores were cut in the well. Core 1was cut in the interval 1705 - 1717 m with only 0.6 m core recovered. Cores 2 - 13 were cut in the Danian chalk (Ekofisk Formation), while cores 14 - 18 were cut in the Maastrichtian chalk (Tor Formation). No fluid samples were taken on wire line.The well was permanently abandoned on 31 May 1970 as an oil appraisal.TestingTen drill stem tests were carried out through perforations in the 7" liner. DST 1 and 2 tested the intervals 3352 - 3362 m and 3331 - 3341 in the in the Tor Formation. They produced only water. DST 3 to 9 tested different zones in the interval from 3124 to 3319 m in the Ekofisk and Tor Formations. They produced gas and oil. The oils were in the range 33.2 to 36 deg API and the GOR varied from 182 to 243 Sm3/Sm3. DST 10 tested the interval 3016 - 3024 m in the Sele Formation. It flowed 2.4 Sm3 of water, and then died. Reservoir temperatures at mid perforation were reported to be: 134.4 deg C (at 3317.7 m) in DST 3, 133.6 deg C (at 3281.2 m) in DST 4, and 132.2 deg C (at 3238.5 m) in DST 5. -
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]627.903431.13 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom210220.010225.0[ft ]310226.010233.0[ft ]410235.010252.0[ft ]510250.010276.0[ft ]610276.010279.0[ft ]710279.010289.0[ft ]810294.010310.0[ft ]910314.010324.0[ft ]1010379.010388.0[ft ]1110385.010395.0[ft ]1210550.010573.0[ft ]1310665.010669.0[ft ]1410669.010679.0[ft ]1510679.010708.0[ft ]1610750.010769.0[ft ]1710870.010894.5[ft ]1810894.510949.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]84.4Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30131.036131.00.00LOTSURF.COND.20607.026619.00.00LOTINTERM.13 3/81629.017 1/21633.00.00LOTINTERM.9 5/93007.012 1/43018.00.00LOTLINER73389.08 1/23432.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.03354336325.42.03332334125.43.03317332019.04.03268329628.55.03235324419.06.0319532266.37.03195322619.08.0313931486.09.03124315425.410.03124322419.011.03015302325.4Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.07.30027.5004.05.028.0006.028.50046.0007.028.00033.0008.028.00046.0009.028.00020.00010.028.00038.00011.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.03.0323585810.8554.0328629670.8455.0172363370.8536.0166357990.8487.06091298120.8548.0186393370.8479.0326792400.84910.05951329250.85911.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL29473379CDM6103429CDS14022012DIR6073430FDC16293429GR98607GRN29423372IES6073429LL-730083429MLL-C30083429SGR6071629SGR-C16293426SNP30083429VDL29883384VELOCITY6073426AA30083425 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit9817302960296029692976300530233076309030903253 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.43 -
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]pdf11.81pdf9.41pdf0.12pdf1.18pdf55.84pdf1.40pdf29.21pdf29.53pdf1.19pdf1.24pdf32.20pdf27.19pdf19.24 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6191.03seawater11531.70cacl/broxin16321.71seaw/broxin23201.71seaw/broxin30181.71seaw/broxin32251.71seaw/broxin -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory10668.0[ft]COD -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit10679.00[ft ]10685.00[ft ]10759.00[ft ]149.00[m ]150.00[m ]151.00[m ]156.00[m ]157.00[m ]160.00[m ]161.00[m ]162.00[m ]165.00[m ]170.00[m ]