30/6-14
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General information
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Wellbore history
GeneralWell 30/6-14 was drilled on the Zeta structure on the Brage Horst, east of the main Oseberg Alpha structure and south of the Oseberg Beta structure. The primary objectives for the well were to find hydrocarbons in the Brent Group, and to find additional hydrocarbon accumulations within possible Early and Late Jurassic sandstone deposits. Planned TD of the well was ca 3100 m or 75 m into the Statfjord Formation.Operations and resultsWildcat well 30/6-14 was spudded with the semi-submersible installation Treasure Scout on 17 December 1983 and drilled to TD at 2900 m in the Early Jurassic Statfjord Group. No significant problems occurred in the operations. The well was drilled using water based mud. The well was drilled with spud mud down to 618 m, with KCl/polymer mud from 618 m to 1675 m,Top Brent Group was penetrated at 2650 m and top Drake Formation at 2589 with an Intra Drake Sand at 2605 to 2621 m. Both Brent and Drake were found water bearing. Hydrocarbons were encountered in the top of the Early Jurassic Statfjord Group from 2783.5 m down to a depth of 2789 m. RFT pressures indicated the free water level to be at 2790 m. No additional hydrocarbon bearing reservoirs were encountered. Apart from spots of cut fluorescence on claystones in the Drake Formation no oil shows were recorded outside of the Statfjord Group hydrocarbon bearing reservoir.Three cores were cut in the Jurassic sequence, one from 2561 to 2567.6 m in the Etive Formation, one from 2608 to 2621.2 m in the Drake Formation, and one from 2785 to 2800 m in the upper part of the Statfjord Group. No wire line fluid samples were taken.The well was permanently abandoned on 8 February 1984 as an oil discovery.TestingTwo DST's were performed in the oil zone in the Statfjord Formation.DST no 1 (2783 - 2787 m) produced no formation fluid to the surface, but 12.7 m3 /day of diesel cushion was produced through a 128/64" choke. Oil samples were recovered when reversing out the test tubing content. The oil gravity was 36 deg API. The bottom hole temperature was 103.3 deg C.DST no 1A was a re-perforation of the same interval as in DST no 1, with one additional meter (2783 - 2788 m). The purpose was to improve the poor results from DST no 1. Again only small amounts of oil were produced: 19.8 m3 diesel cushion /day through a 128/64" choke. No crude oil was produced to surface. Oil samples from reversing out the test tubing had a gravity of 38 deg API. The bottom hole temperature was 110 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]270.002900.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12566.12567.6[m ]22608.02621.2[m ]32785.02798.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]28.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDSTDST1A2783.002788.0029.01.1984 - 00:00YES -
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 typeCONDUCTOR30258.036260.00.00LOTSURF.COND.20601.026618.01.79LOTINTERM.13 3/81648.017 1/21675.01.74LOTINTERM.9 5/82885.012 1/42900.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02783278750.81.12783278850.8Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.01.1Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0130.8451.1200.835 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL2951640CBL VDL12952824CST24292075CST29052440DLL MSFL CAL GR26002900ISF SON6011647ISF SON618258ISF SON16492905LDT6011648LDT CNL16492905NGT22252905RFT24212851SHDT18002903VELOCITY3542905 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit17170685418571857192019522098212222522275227523342407243225602560258925892679269627342784278427992855 -
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]pdf1.96pdf9.59 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4951.1053.0WATER BASED13651.1250.0WATER BASED16501.1345.0WATER BASED17101.2545.0WATER BASED21951.2445.0WATER BASED22801.2554.0WATER BASED23601.2450.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2265.0[m]DCPETROSTR2270.0[m]DCPETROS2275.0[m]DCPETROS2280.0[m]DCPETROS2285.0[m]DCPETROS2290.0[m]DCPETROS2295.0[m]DCPETROS2300.0[m]DCPETROS2305.0[m]DCPETROS2310.0[m]DCPETROS2315.0[m]DCPETROS2320.0[m]DCPETROS2325.0[m]DCPETROS2330.0[m]DCPETROS2335.0[m]DCPETROS2340.0[m]DCPETROS2345.0[m]DCPETROS2350.0[m]DCPETROS2355.0[m]DCPETROS2360.0[m]DCPETROS2365.0[m]DCPETROS2370.0[m]DCPETROS2375.0[m]DCPETROS2380.0[m]DCPETROS2385.0[m]DCPETROS2395.0[m]DCPETROS2405.0[m]DCPETROS2415.0[m]DCPETROS