{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 395,
    "wlbName" : "30/10-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/10-5 was drilled on the northern\r\ntip of the Frigg Field. Its main purpose was to explore a deep-seated closure\r\nat Middle Jurassic level. This structure was targeted already in the 30/10-1\r\nand 30/10-4 wells, but it was not reached because well 30/10-1 was terminated in the Late\r\nCretaceous due to high-pressure problems and well 30/10-4 became junked in the Miocene due to an unrecoverable fish. \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 30/10-5 was spudded with\r\nthe semi-submersible steel installation Neptune 7 on 25 August 1974 and drilled\r\nto TD at 5185 m in the Late Triassic Hegre Group. Reaming of the 12 1/4"\r\nhole to17 1/2" for setting the 13 3/8" casing was delayed due to\r\nseveral twist-offs, junk in hole, pod trouble and weather. After setting the13\r\n3/8" casing drilling was resumed. At 2943 m, lost circulation was\r\nencountered, however; after setting a cement plug, drilling was continued\r\nwithout difficulties. Drilling from the sea floor to 747 m was with seawater\r\nand gel. Below 747 m a fresh-water Spersene XP 20 (lignosulphonate) mud system\r\nwas used.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Oligocene section consisted entirely\r\nof siltstone and clay. The Eocene, section contained a sandstone reservoir\r\n(Frigg Formation, first informally termed "Frigg Clastic Tongue")\r\nfrom 1964 m to 2150 m. Good gas shows were present from 1965 m to 1974 m and\r\ngood oil shows from 1974 m to 1978 m. Below 1978 m the section was water wet.\r\nThe Rogaland Group contained 159 m of potential sandstone reservoirs but no shows\r\nwere encountered. The Danian consisted of silty limestone and dark grey shale.\r\nThe Late Cretaceous consisted primarily of interbeds of tight micritic\r\nlimestone, marl and shale. Numerous gas shows were noted in limestone stringers\r\nin the uppermost part of this section. The limestone section between 2917 m and\r\n2943 m was sandy and contained some gas. A second zone between 3628 m and 3534\r\nm also contained some gas. Log analysis indicated",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}