30/9-15
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General information
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Wellbore history
GeneralWell 30/9-15 is located in the Eastern part of Block 30/9 on the Oseberg Sør Field. The primary objectives of the well were to test the hydrocarbon potential of the Brent Group, Cook, and the Statfjord Formations on the J-north compartment with respect to commercial volumes and future relinquishment decisions. It was not possible to locate a vertical well on the J-north compartment which could test all three reservoir levels in an optimal position. Priority was therefore given to the Brent reservoir, and the well location was chosen in order to prove hydrocarbons in the Brent Group, leaving a minimum of untested hydrocarbon potential in the lower Ness reservoir up dip of the well. Secondary objectives were to penetrate the Cook and Statfjord Formations shallower than the water up to (WUT) top Statfjord in well 30/9-5 (2564 m MSL).Operations and resultsWildcat well 30/9-15 was spudded with the semisubmersible installation "West Vanguard" on 7 December 1993 and was drilled to a& total depth of 2764 m in the Early Jurassic Statfjord Formation. The well was drilled with sea water and hi-vis pills down to top of 12 1/4" section at 936 m, and with ANCO 2000 mud with glycols from 936 to TD. The Brent Group was encountered at 2249 m and was proven to be oil bearing in the lower Ness Formation, with an ODT at 2348.5 m. The ORE (Oseberg/Rannoch/Etive) Formations contained residual oil. The Cook Formation was proven water bearing though moderate to weak shows were recorded from sidewall cores taken over the interval 2465.5 - 2475.5 m. The Statfjord Formation was proven water bearing. Three conventional cores were recovered from the intervals 2240 m to 2250 m (Hardråde, Åsgard, and Ness Formations), 2256m to 2281 m (Ness, ORE, and Drake Formations), and 2283 m to 2306 m (Drake Formation). A wire line MDT sample of acceptable quality was recovered from 2249.9 m in the oil zone in the Ness Formation. The well was plugged back and permanently abandoned as an oil discovery on 5 January 1994.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]949.452764.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12240.02249.6[m ]22256.02280.6[m ]32283.52305.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]56.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30217.036218.00.00LOTINTERM.13 5/8929.017 1/2936.00.00LOTINTERM.9 5/82201.012 1/42215.00.00LOTOPEN HOLE2764.08 1/22764.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST GR22482688DIL SDT/LSS SP GR217934DLL LDL CNL SDL SP AMS GR9272187DLL MSFL LDL CNL NGT AMS22012326DLL MSFL SDL SP AMS GR22012760LDL CNL FMS AMS GR22012755MDT AMS22492263MDT AMS GR22212738MWD RGD - YGR RES DIR1272764VSP9802752 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit128657718842101410281177119419011901196420092151215621562242224222492249226522762276246124892616 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.47 -
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]pdf10.08 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1281.03WATER BASED2181.20WATER BASED2451.05WATER BASED6231.03WATER BASED9001.4528.0WATER BASED9361.3936.0WATER BASED11431.3936.0WATER BASED19051.4534.0WATER BASED21711.4527.0WATER BASED22151.4527.0WATER BASED22401.2019.0WATER BASED22801.2019.0WATER BASED22831.2018.0WATER BASED23061.2015.0WATER BASED23301.2020.0WATER BASED24481.2015.0WATER BASED27141.2020.0WATER BASED27641.2020.0WATER BASED -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory949.4[m]DCSTRAT959.4[m]DCSTRAT969.4[m]DCSTRAT979.4[m]DCSTRAT989.4[m]DCSTRAT999.4[m]DCSTRAT1009.4[m]DCSTRAT1039.4[m]DCSTRAT1069.4[m]DCSTRAT1099.4[m]DCSTRAT1129.4[m]DCSTRAT1159.4[m]DCSTRAT1189.4[m]DCSTRAT1219.4[m]DCSTRAT1249.4[m]DCSTRAT1279.4[m]DCSTRAT1309.4[m]DCSTRAT1339.4[m]DCSTRAT1369.4[m]DCSTRAT1399.4[m]DCSTRAT1429.4[m]DCSTRAT1459.4[m]DCSTRAT1489.4[m]DCSTRAT1519.4[m]DCSTRAT1550.0[m]DCSTRAT1560.0[m]DCSTRAT1570.0[m]DCSTRAT1580.0[m]DCSTRAT1590.0[m]DCSTRAT1600.0[m]DCSTRAT1610.0[m]DCSTRAT1640.0[m]DCSTRAT1660.0[m]DCSTRAT1670.0[m]DCSTRAT1680.0[m]DCSTRAT1690.0[m]DCSTRAT1700.0[m]DCSTRAT1730.0[m]DCSTRAT1740.0[m]DCSTRAT1750.0[m]DCSTRAT1760.0[m]DCSTRAT1790.0[m]DCSTRAT1820.0[m]DCSTRAT1830.0[m]DCSTRAT1840.0[m]DCSTRAT1850.0[m]DCSTRAT1860.0[m]DCSTRAT1870.0[m]DCSTRAT1880.0[m]DCSTRAT1890.0[m]DCSTRAT1900.0[m]DCSTRAT1910.0[m]DCSTRAT1920.0[m]DCSTRAT1930.0[m]DCSTRAT1940.0[m]DCSTRAT1950.0[m]DCSTRAT1960.0[m]DCSTRAT1965.0[m]DCSTRAT1970.0[m]DCSTRAT1980.0[m]DCSTRAT1985.0[m]DCSTRAT1990.0[m]DCSTRAT1995.0[m]DCSTRAT2000.0[m]DCSTRAT2010.0[m]DCSTRAT2015.0[m]DCSTRAT2020.0[m]DCSTRAT2030.0[m]DCSTRAT2040.0[m]DCSTRAT2050.0[m]DCSTRAT2055.0[m]DCSTRAT2060.0[m]DCSTRAT2070.0[m]DCSTRAT2080.0[m]DCSTRAT2090.0[m]DCSTRAT2100.0[m]DCSTRAT2110.0[m]DCSTRAT2120.0[m]DCSTRAT2130.0[m]DCSTRAT2140.0[m]DCSTRAT2150.0[m]DCSTRAT2155.0[m]DCSTRAT2160.0[m]DCSTRAT2170.0[m]DCSTRAT2180.0[m]DCSTRAT2185.0[m]DCSTRAT2190.0[m]DCSTRAT2195.0[m]DCSTRAT2202.0[m]DCSTRAT2215.0[m]DCSTRAT2220.0[m]DCSTRAT2230.0[m]DCSTRAT2240.0[m]DCSTRAT2312.0[m]DCSTRAT2320.0[m]DCSTRAT2335.0[m]DCSTRAT2340.0[m]DCSTRAT2345.0[m]DCSTRAT2350.0[m]DCSTRAT2365.0[m]DCSTRAT2370.0[m]DCSTRAT2375.0[m]DCSTRAT2380.0[m]DCSTRAT2395.0[m]DCSTRAT2410.0[m]DCSTRAT2415.0[m]DCSTRAT2425.0[m]DCSTRAT2440.0[m]DCSTRAT2457.0[m]DCSTRAT2460.0[m]DCSTRAT2465.0[m]DCSTRAT2470.0[m]DCSTRAT2485.0[m]DCSTRAT2500.0[m]DCSTRAT2515.0[m]DCSTRAT2530.0[m]DCSTRAT2545.0[m]DCSTRAT2560.0[m]DCSTRAT2575.0[m]DCSTRAT2590.0[m]DCSTRAT2600.0[m]DCSTRAT2605.0[m]DCSTRAT2620.0[m]DCSTRAT2632.0[m]DCSTRAT2650.0[m]DCSTRAT2665.0[m]DCSTRAT2682.0[m]DCSTRAT2695.0[m]DCSTRAT2710.0[m]DCSTRAT2725.0[m]DCSTRAT2740.0[m]DCSTRAT2757.0[m]DCSTRAT2764.0[m]DCSTRAT