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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 471,
    "wlbName" : "7120/5-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 7120/5-1 was drilled west of\r\nthe Snøhvit Field on a separate structure, the Alpha structure in the\r\nHammerfest Basin. The main objective of the well was to test possible\r\nhydrocarbon accumulations in the Alpha structure of Middle to Lower Jurassic\r\nage. A secondary objective was to drill into rocks of upper Triassic age at a\r\nprognosed depth of 3047 m.\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 7120/5-1 was spudded by Smedvigs\r\nsemi-submersible rig West Vanguard 17 April 1985, and completed 6 June 1985.\r\nThe well was drilled with spud mud down to 885 m and with gypsum/polymer mud\r\nfrom 885 m to TD. Seventy-four meter below the 20" casing shoe, after the\r\nwell had penetrated a fault at 954 m, high background gas with heavy components\r\nwas encountered. The high background gas persisted throughout this section down\r\nto the 13 3/8" casing point at 1975 m. Drilling went on without any\r\nserious problems.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe lithology in the Tertiary and\r\nCretaceous comprises clay with scattered Lime-, Dolomite- and Siltstone layers.\r\nThe Jurassic Stø Formation was encountered at 2285 m represented by clayey\r\nsands, while the clean part of that formation came in at 2341 m. Nordmela\r\nFormation was found at 2427 m, and top of Triassic rocks, Fruholmen Formation,\r\ncame in at 2648 m. Both Stø- and Nordmela Formations were water bearing, but\r\nwith good oil shows. Geochemical analyses of extracts from this interval showed\r\na waxy oil. In a sandy zone between 2405 m to 2420 m high resistivity values\r\nwere encountered, but RFT tests and pressure measurements gave negative\r\nresults. Good source potentials were found in mudstones below ca 1900 m. Shales\r\nfrom 1900 m to 2230 m had TOC in the range 1 % - 3.5 %. A 20 m thick, very\r\norganic rich shale with 6 - 19 % TOC was encountered from 2251 m to 2271 m in\r\nthe Hekkingen Formation. Below this level to TD, frequent claystone interbeds\r\nhad TOC in the range 0.5 % - 5.5 % in cuttings (up to 13.42 % in a swc from\r\n2351.2 m). Th",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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