30/4-1
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General information
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Wellbore history
GeneralWell 30/4-1 is located north of the Hild Discovery and west of the Oseberg Field. The main target was Middle Jurassic sandstones in a complex fault and dip-controlled closure. Secondary targets were Palaeogene sands (Balder and Sele Formations) and possible Late Jurassic sands, both in simple dip closures.Operations and resultsWildcat well 30/4-1 was spudded with the semi-submersible installation SEDCO 707 on 1 November 1978 and drilled to TD at 5454 m in the Early Jurassic Dunlin Group.The well penetrated a mainly argillaceous Palaeogene section. However, a distinct interval of interbedded thin argillaceous water-bearing sandstones (beds 1 - 3 m thick) with thicker mudstone intervals was drilled between 2116.5 and 2162.5. The net/gross ratio of this interval was about 0.2 (20%) and the sandstone porosities average around 30% (from Schlumberger logs). The well then penetrated a thick argillaceous Cretaceous and Late Jurassic interval. No Late Jurassic sandstones were developed. Water bearing, Middle Jurassic sandstones of the Brent Group were encountered at 5181.5 m. This target group was 218.2 m thick, had a net/gross ratio of about 0.66 (66%) and had sandstone porosities ranging from around 4-16% (from Schlumberger logs). Shows were recorded in limestones in the interval 2545 m to 2570 m, with weaker shows extending down to 2630 m. Weak shows were also noted in the interval 2900 m to 3000 m. Geochemical analyses of cuttings confirmed migrant "medium gravity oil" in the interval 2570 m to 2630 m. No conventional cores were cut. Wire line RFT samples were attempted but all failed.The well was permanently abandoned as dry on 14 May 1979.TestingNo drill stem test was performed -
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]290.005453.00 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4469.0[m]DCFUGRO4478.0[m]DCFUGRO4526.0[m]DCFUGRO4607.0[m]DCFUGRO4691.0[m]DCFUGRO4859.0[m]DCFUGRO5000.0[m]DCFUGRO5009.0[m]DCFUGRO5024.0[m]DCFUGRO5045.0[m]DCFUGRO5060.0[m]DCFUGRO5174.0[m]DCFUGRO -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit14556090292210501114164817001919191919692000226222623065352037613770392639263960403043874387448551825182521153205340535954005400 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.56 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf4.13pdf3.22pdf2.73pdf0.22 -
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]pdf14.20 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR49505180CBL VDL GR CCL1404047CBL VDL GR CCL1402500CBL VDL GR CCL37504048CST10752318CST24504062FDC CNL GR C19242275ISF BHC GR SP145957ISF BHC GR SP19302097ISF BHC GR SP22753554ISF BHC GR SP C10502340ISF BHC GR SP C35004064ISF BHC GR SP C40484534ISF BHC GR SP C44655029ISF BHC GR SP C49505182ISF BHC GR SP C49505180RFT35263607RFT 151870RFT 1-552205415WST4004062WST20165445 -
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 typeCONDUCTOR30282.036288.00.00LOTSURF.COND.18 5/81051.0261059.00.00LOTINTERM.13 3/82335.017 1/22345.00.00LOTINTERM.9 5/84048.012 1/44072.00.00LOTOPEN HOLE5454.08 3/85454.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1771.0535.0spud mud6661.0861.0seawater10581.0967.0seawater21001.2645.0seawater23451.2655.0seawater28621.5368.0seawater35831.7064.0seawater40721.7954.0seawater48191.9853.0seawater54542.0755.0seawater