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    "wlbNpdidWellbore" : 422,
    "wlbName" : "34/4-1",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 34/4-1 was drilled on the\r\nrotated fault block systems on the Tampen Spur area of the Northern North Sea. The\r\nobjective of the well was to test the stratigraphic sequence below the Base\r\nCretaceous Unconformity. The primary target was the Intra Triassic\r\n"Carnian Sandstone", which was known from two wells in block 33/12\r\nwhere it constitutes more than 100 m silty, argillaceous, partly calcareous\r\ncemented sandstone. The secondary targets were possible reworked Late Jurassic\r\nsandstones immediately below the Unconformity, and by possible sands associated\r\nwith stratigraphically undefined seismic reflectors between Base Cretaceous and\r\nCarnian level.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 34/4-1 was spudded with the\r\nsemi-submersible installation Byford Dolphin on 11 July 1979. The well was\r\nfirst drilled to 2961 m. When pulling out of hole to change bit it got stuck.\r\nThe bit could not be worked free and the drill string was eventually backed off\r\nand left in the hole. A sidetrack was made from 2484 m and drilled to final TD\r\nat 2916 m in the Triassic Teist Formation. The well was drilled with seawater\r\nand viscosity slugs down to 844 m, with Drispac/Unical/gypsum mud from 844 m to\r\n1988 m, and with Drispac/Unical mud from 1988 m to TD, including sidetrack. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated Tertiary, Cretaceous\r\nand Triassic rocks with a hiatus ranging from Late Triassic to Early Cretaceous\u003c/p\u003e\r\n\r\n\u003cp\u003eSecondary target for the well was\r\nreworked Late Jurassic sediments immediately below Base Cretaceous. Such\r\ndeposits were not established. The Triassic sandstones (Lunde Formation) were\r\nencountered at 2508 m and contained oil over a column of more than 100 m. No\r\ndefinite OWC was seen, but it could be estimated to be at 2618 m. Numerous\r\nshows on sandstone stringers were observed in the Cretaceous from ca 2025 m\r\n(top Kyrre Formation) and down to top of the Triassic reservoir. No shows were\r\nobserved below 2622 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eEleven cores were cut in",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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