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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1046,
    "wlbName" : "26/4-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 26/4-1 was the\r\nfirst well drilled in the Stord Basin. The well was designed to test a\r\nPaleocene mound, and sandstones of Jurassic age within a footwall closure. The\r\nPaleocene sandstone was prognosed to come in at 2268 m. Another primary\r\nobjective was to gain information on reservoir quality and hydrocarbon source.\r\nA secondary target was the Sleipner Formation prognosed at 2783 m. Prognosed TD\r\nwas 3500 m MSL.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 26/4-1\r\nwas spudded with Wi1h. Wilhelmsen semi-submersible installation Treasure Scout\r\non 8 may 1987 and completed 17 July 1987 at a depth of 3690 m in Triassic Hegre\r\nGroup. Drilling proceeded without significant problems, except for several\r\noccurrences of lost circulation due to increasing formation pressure in\r\nTertiary rocks. The well was drilled with seawater and bentonite down to 236 m,\r\nwith seawater / bentonite /PAC from 236 m to 723 m, with KCl / Polymer mud from\r\n723 m to 2680 m, and with seawater / polymer from 2680 to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Paleocene Mound\r\n(Ty Formation sand) came in at 2246 m. Pressure measurements taken 7 m into the\r\nmounds displayed normal pressure conditions, and the sandstone proved to be\r\nwater bearing. The Jurassic Draupne Formation came in at 2637 m with a total\r\nthickness of 88 m. An extremely radioactive layer was found between 2688 and\r\n2693 m. The Sleipner Formation sandstone came in at 2820 m. Top Statfjord\r\nFormation came in at 3308 m. Sands in Jurassic (Hugin and Statfjord Formations)\r\ndisplayed a very slow white cut fluorescence and traces of oil on cores, but\r\nwere otherwise found dry. Post well geochemical analyses revealed very good\r\nsource rock intervals in the Draupne Formation (oil prone) and the Statfjord\r\nFormation (oil and gas prone). Draupne shale and Sleipner coal are immature\r\nwith Vitrinite reflectance around 0.5 %Ro, while the Statfjord coals may be\r\nmarginally mature with Vitrinite reflectance around 0.6 %Ro and Tmax\r\napproaching 450 °C.\u003c/p\u003e\r\n\r\n\u003cp\u003eFour",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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