30/6-19
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General information
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Wellbore history
GeneralWell 30/6-19 was drilled on the Beta Saddle prospect between the Veslefrikk field and the 30/6-5 Oseberg East (Beta South) discovery. The objectives of the well were to prove hydrocarbons in the Brent Group, the Cook Formation, and the Statfjord Group. Planned TD was ca 3400 m or ca 100 m into the Statfjord Formation.Operations and resultsWell 30/6-19 was spudded with the semi-submersible installation Polar Pioneer on 9 April 1986 and drilled to TD at 3301 m in the Early Jurassic Statfjord Group, Eirikson Formation. Drilling proceeded without significant problems down to 1589 m where the string got stuck and the well was sidetracked at 1179 m. At 3117 m the string got stuck and a cement plug was set at 2847 m. The well was sidetracked again at 2822 m and drilled to TD.The Brent Group (2857 - 2989 m) contained oil down to the OWC at 2956.5 m (Free water level from RFT). Net pay in the oil zone is 58.1 m with an average porosity of 18.8% and an average water saturation of 48.3%. No additional hydrocarbon reservoirs were encountered by the well and only occasional weak shows were seen on sandstone stringers in the Drake Formation and single grains in the Statfjord Group. RFT pressures showed the Cook Formation to be overpressured and the Statfjord Group to be underpressured relative to the Brent Group. This assumes same water density as in the Brent Group water zone.Four conventional cores were cut in the Brent reservoir from 2858 - 2970 m. Core depths are ca 1.5 m shallower than logger's depth. RFT pressure recordings were performed throughout the Brent Group and in the Cook and Statfjord Formations. Segregated RFT samples were taken in the final sidetrack in the Ness Formation (2869 m; water and a little oil), the Etive Formation (2909 m; oil), and in the Oseberg Formation (2954.8 m water and a little oil).The well was suspended 21 June 1986 for further testing at a later time. It is classified as an oil and gas discovery.TestingThree drill stem tests were performed.DST 1 tested the interval 2945-2954.0 in the Lower Oseberg Formation. It produced 564 Sm3 oil and 26000 Sm3 gas through a 40/64" choke. GOR was 46 Sm3/Sm3. Oil density was 0.864 g/cm3 and associated gas was 0.85 (air = 1) with 5% CO2 and 3.5 ppm H2S. Bottom hole temperature in the test was 124 deg C.DST 2 tested the interval 2907 - 2932.3 m in the Upper Oseberg, Rannoch and Etive Formations. It produced 797 Sm3 oil and 34000 Sm3 gas through a 36/64" choke. GOR was 43 Sm3/Sm3. Oil density was 0.833 g/cm3 and associated gas was 0.78 (air = 1) with 5% CO2 and 4 ppm H2S. Bottom hole temperature in the test was 122 deg C.DST 3 tested the interval 2876-2884 m in the Ness Formation. It produced 668 Sm3 oil and 25000 Sm3 gas through a 52/64" choke. GOR was 50 Sm3/Sm3. Oil density was 0.831 g/cm3 and associated gas was 0.86 (air = 1) with 4.5% CO2 and 5 ppm H2S. Bottom hole temperature in the test was 123 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]620.003300.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12858.02886.0[m ]22886.02913.7[m ]32914.02942.0[m ]42942.02954.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]95.7Cores 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 availableDSTDST12945.002954.00OIL06.06.1986 - 00:00YESDSTDST22907.002932.30OIL11.06.1986 - 00:00YESDSTDST32876.002784.0015.06.1986 - 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 typeSURF.COND.20602.026729.01.39LOTINTERM.13 3/81495.017 1/21589.01.76LOTINTERM.9 5/82790.012 1/42804.01.68LOTLINER73273.08 1/23301.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02945295415.92.02907293214.33.02876288420.6Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0564260000.8610.850462.0797340000.8330.780523.0668250000.8310.86050 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL CET3351493CBL VDL CET13273004CST22152795CST22422751CST28123299DIL LSS GR SP5503302DLL MSFL LSS GR27903065LDL CNL NGT CAL GR6023302RFT28582926RFT28583283SHDT14933302 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit183722891194119412032206522172247254925722572267728572857286629052915292029892989310331593198325532553275 -
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]pdf15.95 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2671.03WATER BASED09.04.19865631.0510.08.0WATER BASED10.04.19866141.159.027.0WATER BASED13.04.19866141.0514.031.0WATER BASED13.04.19866141.0516.041.0WATER BASED13.04.19866141.0915.09.0WATER BASED14.04.19866191.0915.09.0WATER BASED15.04.19867291.0912.09.0WATER BASED16.04.198611531.1520.012.0WATER BASED20.04.198612021.1320.011.0WATER BASED21.04.198612711.1121.015.0WATER BASED17.04.198613591.1522.013.0WATER BASED22.04.198615391.2527.016.0WATER BASED23.04.198615391.2527.016.0WATER BASED24.04.198615391.4027.020.0WATER BASED27.04.198615891.1120.013.0WATER BASED20.04.198617181.4023.015.0WATER BASED27.04.198620731.4025.015.0WATER BASED27.04.198622301.4021.014.0WATER BASED29.04.198623881.4017.08.0WATER BASED29.04.198624531.4021.011.0WATER BASED01.05.198624961.4017.08.0WATER BASED01.05.198625901.4019.010.0WATER BASED04.05.198626811.4017.09.0WATER BASED04.05.198628001.2215.08.0WATER BASED20.05.198628031.4015.09.0WATER BASED04.05.198628031.4014.08.0WATER BASED05.05.198628041.4018.09.0WATER BASED06.05.198628041.4018.08.0WATER BASED08.05.198628041.4018.09.0WATER BASED08.05.198628401.2110.06.0WATER BASED11.05.198628461.2521.08.0WATER BASED21.05.198628861.219.05.0WATER BASED11.05.198629001.1914.08.0WATER BASED15.06.198629001.1914.08.0WATER BASED16.06.198629001.1914.08.0WATER-BASED17.06.198629001.1913.07.0WATER-BASED18.06.198629001.1913.07.0WATER-BASED19.06.198629001.1922.013.0WATER-BASED22.06.198629141.2116.08.0WATER BASED11.05.198629391.1812.05.0WATER BASED10.06.198629391.1812.05.0WATER BASED11.06.198629391.1912.05.0WATER BASED12.06.198629391.1918.08.0WATER BASED09.06.198629391.1914.08.0WATER BASED15.06.198629631.2213.08.0WATER BASED12.05.198629761.2523.011.0WATER BASED25.05.198630001.2520.08.0WATER BASED25.05.198630021.2111.07.0WATER BASED13.05.198630381.2114.08.0WATER BASED14.05.198630431.1918.08.0WATER BASED05.06.198630431.1916.07.0WATER BASED01.06.198630431.1914.06.0WATER BASED02.06.198630431.1913.06.0WATER BASED03.06.198630431.1918.08.0WATER BASED04.06.198630431.1918.08.0WATER BASED08.06.198630881.2214.09.0WATER BASED15.05.198631101.2519.08.0WATER BASED25.05.198631171.2120.010.0WATER BASED19.05.198631171.2217.09.0WATER BASED19.05.198631171.2216.09.0WATER BASED19.05.198631171.2214.07.0WATER BASED19.05.198631611.2518.08.0WATER BASED26.05.198632641.2518.08.0WATER BASED27.05.198633011.2520.010.0WATER BASED28.05.198633011.2520.010.0WATER BASED29.05.198633011.1916.08.0WATER BASED01.06.1986