30/6-2
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General information
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Wellbore history
GeneralWell 30/6-2 was drilled to appraise the 30/6-1 Oseberg discovery. Well 30/6-1 found gas in the Brent Group and water-filled reservoirs in the Dunlin and Statfjord groups. The primary objectives were to test the Dunlin and Statfjord sandstones in a structurally higher setting on the Oseberg Alpha structure. Secondary objective was appraisal of the Brent Group hydrocarbons.Operations and resultsAppraisal well 30/6-2 was spudded with the semi-submersible installation Deepsea Saga on 24 September 1979 and drilled to TD at 2890 m in the Triassic Hegre Group. Tight hole became a serious problem at 1313 m. This was cured with salt water and diesel addition. Five days were counted as non-productive due to bad weather and fishing for lost objects in hole. The well was drilled with spud mud down to 736 m, and with Chromium-Lignosulphonate/bentonite mud from 736 m to TD. After the diesel addition at 1313 m the mud contained 8% diesel. The diesel content became slowly diluted to 0.25% at TD.The Brent Group was penetrated from 2191 to 2237. It is 46 m thick and gas bearing. The hydrocarbon/water contact was not seen in the well. The underlying Dunlin and Statfjord groups were both water bearing. Oil shows were described on cuttings and 39% water saturation was calculated, from top Brent and all through the Shetland Group up to 2165 m. Further oil shows on cuttings and core were described at 1945 to 1955 m in the Balder Formation, on cores and cuttings in the Dunlin Group, and on the Statfjord core.A total of seven cores were recovered in the interval from 2202 to 2238.5 m in the Brent Group, 2435 m to 2437.5 m, and 2444.5 to 2454.5 m in the Dunlin Group, and 2571 to 2577 m in the top of the Statfjord Group. An RFT gas sample was taken at 2222.3 m.The well was permanently abandoned on 11 December as a gas/condensate appraisal well.TestingA drill stem test was performed from the interval 2212 to 2222 m.The test produced 722000 Sm3 gas and 212 Sm3 oil /day through a 1" choke. The GOR was 3400 Sm3/Sm3, the oil gravity was 59 °API, and the gas gravity was 0.66 (air = 1). Water, sand or H2S were not observed, but 0.3 - 0.6% CO2 was recorded. -
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]180.002890.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12202.02205.2[m ]22205.52209.3[m ]32210.02227.5[m ]42227.52237.8[m ]52435.02437.5[m ]62444.52452.3[m ]72571.02577.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]51.3Cores 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 typeLaboratory8100.0[ft]C8200.0[ft]DC8300.0[ft]DC8400.0[ft]DC8500.0[ft]DC8600.0[ft]DC8700.0[ft]DC8800.0[ft]DC10760.0[ft]DC10860.0[ft]DC10950.0[ft]DC11060.0[ft]DC11160.0[ft]DC11250.0[ft]DC11360.0[ft]DC11460.0[ft]DC11500.0[ft]DC11540.0[ft]DC11600.0[ft]DC11700.0[ft]DC11800.0[ft]DC11900.0[ft]DC12000.0[ft]DC12110.0[ft]DC12200.0[ft]DC12300.0[ft]DC12390.0[ft]DC12490.0[ft]DC12600.0[ft]DC12690.0[ft]DC12790.0[ft]DC -
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 availableDSTDST1A2212.002222.00CONDENSATE01.12.1979 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit131650863193519351990208221652191219122112237223724312445251325682808 -
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]pdf29.34 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02212222219.1Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01916460000.7400.6503397 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL GR2802378DLL MSFL GR17022885FDC CNL GR CAL17022886FDC GR CAL9001713HDT17022886ISF SON GR SP1252885VELOCITY6552880 -
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 typeCONDUCTOR30177.036178.50.00LOTSURF.COND.20901.026915.01.80LOTINTERM.13 3/81704.017 1/21715.01.74LOTINTERM.9 5/82389.012 1/42400.01.76LOTOPEN HOLE2890.08 1/22890.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4801.1044.0waterbased8801.0639.0waterbased9251.1050.0waterbased10851.1242.0waterbased13751.30waterbased15601.35waterbased17151.40waterbased19801.50waterbased24001.34waterbased24421.3553.0waterbased