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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2690,
    "wlbName" : "25/8-8 A",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/8-8 S was\r\ndrilled to test the Paleocene Heimdal Formation sandstones (Tau Prospect)\r\nlocated southeast of the Jotun Field and north east of the Balder Field on the\r\neast margin of the South Viking Graben. The well was planned with flexibility\r\nto be sidetracked into two other reservoir segments from the same 13 3/8"\r\ncasing. The well proved oil in the target and two sidetracks were drilled. Well\r\n25/8-8 A was the first sidetrack and the objective was to appraise the discovery\r\nin the primary well and to evaluate the sand quality in the eastern segment of\r\nthe Tau Structure. Well 25/8-8 B was the second sidetrack and the objective was\r\nto appraise and evaluate resource potential in the western segment of the\r\n25/8-8 S Discovery and to confirm oil-water and possibly gas-oil contacts.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well\r\n25/8-8 S was spudded with the semi-submersible installation "Vildkat\r\nExplorer" on 22 August 1995 and drilled deviated to TD at 2592 m (2343.7 m\r\nTVD SS) in the Late Jurassic Draupne Formation. The well was drilled to 1058 m\r\nwith seawater and high viscosity gel pills. From 1058 m to TD the well was\r\ndrilled using an oil-based mud, "Safemul". MWD-GR-Res was used during\r\ndrilling. MWD-resistivity failed at 872 m and the hole was drilled to 1058 m\r\nwithout resistivity log. No shallow gas was observed. The 13 3/8" casing\r\nwas set at 1046.5 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eWhen the second run\r\nwith the MDT was done, the MDT cable became stuck. The cable broke at the\r\ncasing shoe, leaving the tool and about 1000 m of cable in the hole. A fishing\r\njob was performed to get the tool and cable out. The fishing job was successful\r\nand the rest of the logging program was completed.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe target Heimdal\r\nFormation was penetrated at 2236 m and was found hydrocarbon bearing. A GOC is\r\nindicated within the interval 2244.9-2252.0 m (2057.0-2063.0 m TVD SS) based on\r\nELAN log analysis, pressure analysis and geochemical analyses. Av",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}