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    "wlbNpdidWellbore" : 398,
    "wlbName" : "31/2-1",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-1 is the Troll West gas and oil\r\nDiscovery well. The purpose of the well was to establish the basic stratigraphy\r\nin the area, and to evaluate the prospectivity of the Jurassic sequence. The\r\nstructure is formed by a tilted Jurassic fault block on the Sogn Spur High\r\nbetween the North Viking Graben and the Horda Basin. A migration path from the\r\nViking Graben kitchen area is provided by monoclinal fault blocks. The most\r\ndominant characteristic of the structure was the presence of a\r\n"flatspot", which was believed to be associated with a present\r\nhydrocarbon/water contact. Sealing of the potential Jurassic reservoir is\r\nprovided by Cretaceous and Paleocene Claystones, overlying the reservoir\r\nsandstones.\u003c/p\u003e\r\n\r\n\u003cp\u003e \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Type Well for the Johansen,\r\nKrossfjord, Fensfjord, and the Sognefjord Formations, and Reference Well for\r\nthe Amundsen, Cook, and Drake Formations.\u003c/p\u003e\r\n\r\n\u003cp\u003e \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 31/2-1 was spudded with the\r\nsemi-submersible installation Borgny Dolphin on 17 July 1979 and drilled to TD\r\nat 2433 m in the Late Triassic Hegre Group. Severe problems with setting the\r\n30" casing led to abandoning of the first hole and re-spudding on 24 July,\r\n50 m to the south of the original spud position. The well was drilled with gel\r\npolymer down to 793 m, and with gypsum/lignosulphonate mud from 793 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well 31/2-1 proved the existence of a\r\nLate - Middle Jurassic gas bearing reservoir sequence in the Flathead A\r\nstructure (block 31/2). A gross commercial gas column of 134.5 metres with top\r\nat 1439.5 m was encountered in good-moderate quality coastal - shallow marine\r\nsands. Good oil shows with oil bleeding from cores were encountered from 1567 m\r\nto 1597 m, below the gas. It is possible that both a gas-oil contact and an\r\noil-water contact occur in this zone, however, data available suggested tight\r\nformation. From the pressure data the plausible interpretation is t",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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