25/4-7
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General information
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Wellbore history
GeneralThe Kneler well 25/4-7 was designed as an exploratory test of an irregular 4-way closure midway between the Kameleon structure (discovered by well 24/6-2 in 1998), and the Gekko structure (discovered by well 25/4-3 in 1974), which found a thin hydrocarbon column. The primary reservoir target was the Paleocene Heimdal formation. Well 25/4-7 was designed to provide local structural control to reduce uncertainty in field size and also provide stratigraphic control, particularly the position and character of a shale horizon at the base of the Upper Heimdal reservoir.Operations and resultsExploration well 25/4-7 was spudded with the semi-submersible installation Deepsea Bergen on 21 March 2003 and drilled to TD at 2286 m in the Paleocene Heimdal Formation. The well was drilled without significant problems. A number of attempts to get wire line tools to TD failed due to hole obstructions. Hole opening of the 12 1/4" section to 8 1/2" was performed in several steps. Between hole opening operations logging was attempted with variable success. Logs were finally acquired down to 2242 m. The well was drilled with seawater down to 1317 m and with Carbosea oil based mud from 1317 m to TD.The Heimdal Formation was encountered at 2084.5 m and from logs, MDT sampling, and shows on cores and cuttings it was oil bearing down to the OWC at 2132.5 m. The Heimdal Formation at this location consists of an upper, heterolithicdominated sequence down to 2105.5 m and more massive sandstone below that depth.A total of 53 m of core (97.7 % recovery) was cut in two cores in the interval from 2104 m to 2157 m in the Heimdal formation. MDT fluid samples were taken at 2086.4 m (oil), 2110.0 m (oil), and at 2144.7 m (water).The well was suspended as an oil discovery on 17 April 2003TestingNo 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]1320.002286.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12104.02129.8[m ]22130.02156.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]52.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableMDT2110.000.00OIL14.04.2003 - 04:35YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1423687271216132018951895200520392085 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.20 -
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].pdf24.81.pdf0.62 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT GR20852157PEX DSI AIT2022025PEX DSI AIT13061373PEX DSI AIT19702235VSI GR7502191 -
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 typeCONDUCTOR30202.036204.00.00LOTSURF.COND.13 3/81308.017 1/21317.01.50LOTOPEN HOLE2286.08 1/22286.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured12001.0116.0SEAWATER13171.2025.0SPUD MUD13341.2018.0OIL (REGULAR)19801.3322.0OIL (REGULAR)22121.2518.0OIL (REGULAR)22861.2519.0OIL (REGULAR) -
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