35/11-13
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General information
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Wellbore history
GeneralWell 35/11-13 is an exploration well in PL 090B on the Astero prospect, which is located north of the Fram West field. The primary objectives were to test the presence and type of hydrocarbons in the Oxfordian Turbidite sands of the Astero prospect. The chosen location was designed to test the Astero prospect within structural closure and stratigraphic trap, close to the top of the structure, in an area where there was good HC indication with thick reservoir sand thickness, leaving acceptable up dip volumes.Operations and resultsWell 35/11-13 was spudded with the semi-submersible installation Deepsea Trym on 18 March 2005 and drilled to TD at 3296 m in sediments of the Late Jurassic Heather Formation. The well was drilled without significant technical problems or delays. The mud used was spud mud down to 701 m and "Aquadrill" glycol mud from 701 m to TD.Water wet Paleocene sandstones were penetrated at 1697 - 1752 m (Heimdal Formation) and at 1842 - 1923 m (Ty Formation). The well encountered a 111 m thick Draupne Formation at 2902 m. The Heather Formation was encountered at 3013 m with Intra-Heather Oxfordian turbiditic sandstones from 3096 m to 3206 m. The sandstones were hydrocarbon bearing and from MDT pressure test results, a gas oil contact was inferred at 3098 m and an oil water contact (FWL) at 3137 m.Two cores were cut in the interval 3100 to 3142 m in the Oxfordian turbidites. They cores comprised mainly sandstones with occasional thin siltstones. MDT fluid samples were taken at four levels across the reservoir: 3097.0 m (gas and 0.789 g/cm3 oil), 3107.0 m (0.848 g/cm3 Oil), 3128.0 m (Oil), and 3157.5 m (Water).The well was permanently abandoned on 28 May 2005 as an oil and gas discovery.TestingA Drill Stem Test was undertaken at 3111.5 to 3130 m in the oil-bearing zone of the Oxfordian sands. A fixed choke size of 32/64" was selected for the main flow period achieving average flow rates of 500 m3/day oil and 78000 m3/day of gas (a total of 2.7 m3 produced water was recorded). A maximum of 2.5 ppm H2S and 6 % CO2 was measured during this period. The oil gravity at 15 deg C was 36 deg API and the GOR was 160 Sm3/Sm3. The formation temperature at mid perforation was determined to 118 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]710.003292.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom13100.03114.4[m ]23115.03134.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]33.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory3104.4[m]CGEOSTRAT3105.3[m]CGEOSTR3106.8[m]CGEOSTR3109.5[m]CGEOSTR3115.2[m]CGEOSTR3125.8[m]CGEOSTR3127.5[m]CGEOSTR3132.8[m]CGEOSTR3133.7[m]CGEOSTR -
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 availableDSTTEST 10.000.00OIL12.05.2005 - 17:15YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit38776315411541155315981697175217691842192319381938208825652626264626712671270029022902301330963206 -
Geochemical information
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Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT GR30973205MDT GR30973157MSCT GR29603151MWD LWD - DIR ECD386476MWD LWD - DIR GR RES ECD4763291SP DSI HRLA PEX ECS29253268VSP GR16113290 -
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 typeCONDUCTOR30471.036474.00.00LOTSURF.COND.20695.026701.01.47LOTINTERM.13 3/81751.017 1/21757.01.64LOTINTERM.9 5/82924.012 1/42932.01.70LOTLINER73290.08 1/23291.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4411.05WATER BASED4741.50WATER BASED7011.2013.0WATER BASED9231.2012.0WATER BASED15001.3011.0WATER BASED17571.3417.0WATER BASED17811.3016.0WATER BASED25551.3015.0WATER BASED26901.3011.0WATER BASED28141.3014.0WATER BASED29321.3016.0WATER BASED31001.3015.0WATER BASED31421.3017.0WATER BASED32901.10WATER BASED32911.3018.0WATER BASED -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit3133.00[m ]3123.76[m ]3111.43[m ]3103.50[m ] -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.22