1/3-8
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General information
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Wellbore history
GeneralWell 1/3-8 is located on the Hidra High in the North Sea. The primary objective was to test the Jurassic Upper Ula sand package within the Kamskjell prospect. The secondary objective was a sand package at the base of the Jurassic. Planned TD was tagging the Triassic or reaching 5085 meters TVD SS.Operations and resultsWildcat well 1/3-8 was spudded with the 3 legs jack-up installation Transocean Nordic on 12 December 1996 and drilled to TD at 5199 m in the Triassic Smith Bank Formation. Two major unscheduled events occurred in the 12 1/4" section. First, the mud line hanger failed. A total of 16 days was required to repair this before drilling could be resumed. Secondly, and more serious, a 3.5 bbl kick was taken at 4529 m while drilling a limestone interval in the Early Cretaceous Cromer Knoll Group. Based on the worst case scenario interpretation of the kick, there could be a large volume of hydrocarbons (estimated at up to 300 bbls) in the annulus between the kick and thief zones. For this reason it was decided to rig up flare booms to increase the rig safety should it become necessary to by-pass the MGS whilst circulating out the influx. The well was opened up, and the influx circulated out at 3.3 bpm. Initially returns were taken through the MGS. After pumping 1464 bbls returns were switched from the MGS to the boom. This decision was taken as gas levels in the pit room were rising, and the seal leg pressure was dropping steadily (from 11.5 to 6.4 psi) indicating the onset of possible blow-down. The flare lit immediately with the clear burn characteristic of condensate. A total of 420 bbls was flared before mud was at surface and the flare extinguished. A total of 15 days were spent stabilising the well to permit running casing and continue drilling the next section. The well was drilled with seawater down to 303 m, with pre-hydrated gel mud down to 1105 m, with KCl/polymer/glycol mud from 1105 m to 3445 m, and with Ancovert oil based mud from 3445 m to TD.The only live hydrocarbons found in the well was the condensate kick at 4529 m in the Cromer Knoll Group, believed to originate from a fracture in the Sola Formation limestone. The target Upper Ula Formation was not found in the well. Poorly developed and generally tight Basal Jurassic sands were encountered at 5005 m with a pooled thickness of ca 22 m. Poor oil shows were recorded in the interval 5007 to 5024 m in these sands. Thin sands were present also in the Triassic, but no shows were recorded in these.One core was cut in the interval 5024 to 5041 m with 15.07 m recovery. One FMT fluid sample was taken at 5006.3 m, recovering muddy water with 190000 ppm of chloride.The well was permanently abandoned on 27 May 1997 as a dry well with shows.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]320.005200.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom15024.05039.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]15.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4738.0[m]DCPETROSTR4837.0[m]DCPETROS4891.0[m]DCPETROS4990.0[m]DCPETROS5024.5[m]CPETROS5032.8[m]CPETROS -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1101902312731273137314432023278335233773377347839494379440244564456450245564685473347334742500550055086 -
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]pdf12.73 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBIL45154627CBIL HEXDIP49035188DPIL ZDEN CN GR33504528FMT45304894FMT50055172HDIL CAL MAC GR34354528HDIL MAC GR10983445HDIL MAC SL45154905HDIL MAC SL49035186HEXDIP45154905MULTI-ARM CAL102919MWD - GR RES3101105PRES GRAD104519RCOR49204928SWC49205181TEMP GR CCL1004524TEMP GR CCL10004515ZDEN CN GR24253445ZDEN CN GR45154905ZDEN CN GR49025198ZO VSP10854520ZO VSP43605190 -
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 typeCONDUCTOR30303.036310.00.00LOTPILOT HOLE310.09 7/81105.00.00LOTSURF.COND.201098.0261105.00.00LOTINTERM.143435.017 1/23445.00.00LOTINTERM.9 5/84515.012 1/24529.00.00LOTLINER7 5/84904.08 1/24910.00.00LOTOPEN HOLE5021.06 1/45021.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3100.905.0water based3512.1474.0oil based11051.5246.0water based15021.6244.0water based19591.6244.0water based24421.6645.0water based24511.6443.0water based24651.6446.0water based26221.6455.0water based29201.5328.0oil based30451.6449.0water based30651.6446.0water based31991.6441.0water based32001.6440.0water based32971.6435.0water based33661.6436.0water based34101.5335.0oil based34351.5529.0oil based34451.6436.0water based36871.5533.0oil based41041.5536.0oil based42421.5537.0oil based42902.1474.0oil based44011.6843.0oil based44631.8056.0oil based45001.8160.0oil based45291.7437.0oil based45311.0335.0oil based46542.0054.0oil based48662.0468.0oil based49052.0460.0oil based49602.1068.0oil based50532.1068.0oil based51792.1065.0oil based52012.1474.0oil based -
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