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  "LayerName" : "Wellbore - History",
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    "wlbName" : "7120/7-3",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 7120/7-3 is located on the\r\nRingvassøy-Loppa Fault Complex west of the Hammerfest Basin and the Snøhvit\r\nField. The primary objective of the well was to test possible hydrocarbon\r\naccumulations in sandstones of Middle to Lower Jurassic age. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was spudded with the\r\nsemi-submersible rig West Vanguard on 18 March 1984 and drilled to TD at 3062 m\r\nin the Early Jurassic Nordmela Formation. The well was drilled with seawater\r\nand bentonite down to 331 m, with lignosulfonate/gypsum/polymer mud from 331 m\r\nto 715 m, with gypsum/polymer mud from 715 m to 1720 m, with polymer mud from\r\n1720 m to 2625 m, and with lignite/polymer mud from 2625 m to TD. The 36"\r\nhole had to be reamed before setting of the 30" casing. During cementing\r\nof 20" casing returns were lost. Technical problems occurred when testing\r\nthe BOP stack before drilling out of the 20" casing shoe, and after the 13\r\n3/8" casing job. Mud problems occurred when drilling out of the 20"\r\ncasing shoe due to cement contamination. Because of tilted wellhead two\r\nattempts to run in the casing was needed. When running in an 8 1/2" bit to\r\nperform leak off test below the 9 5/8" casing shoe, problems occurred\r\ngetting the bit through wearbushing in wellhead. After this 4 kg junk was\r\nrecovered from the hole. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated Tertiary, Cretaceous,\r\nand Jurassic sediments. Lithology down to 2759 m (Base Cretaceous) was\r\ndominantly claystone with stringers of sandstone/siltstone/Limestone/Dolomite.\r\nThe Late Jurassic Hekkingen Formation from 2759 m to 2889 m consisted of shale\r\nwith stringers of siltstone and limestone and traces of sand. Pyrite was seen\r\nin trace amounts in the upper part and was abundant in the lower part of the\r\nsequence. From 2889 m to TD, in the Middle to Early Jurassic, the lithology was\r\nsandstone with shale interbeds. Trace to faint shows were recorded in claystone\r\ncuttings below 1200 m. Good show",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}