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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 402,
    "wlbName" : "31/4-3",
    "wlbHistory" : "\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eGeneral\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 31/4-3 was drilled on the Bjørgvin\r\nArch in the North Sea, east of the Oseberg main field. Near-by well 31/4-2 on\r\nthe southern part of the Brage Horst had recently found live oil and gas in\r\nsmall quantities in the Brent Group. The primary objectives were sandstones\r\nwithin the Early Jurassic Dunlin and Statfjord Formation. They were thought to\r\nbe separate reservoirs with different hydrocarbon/water contacts. A secondary\r\nobjective was to penetrate a deep seismic marker assumed to be a Paleozoic\r\nunconformity. Accumulation of hydrocarbons in Early Triassic and pre-Triassic\r\nsandstones were considered possible if adequate seal and source rocks were\r\npresent. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eOperations and results\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWildcat well 31/4-3 was spudded with the\r\nsemi-submersible installation Treasure Seeker on 24 December 1979 and drilled\r\nto TD at 4981 m in rocks of Triassic/Permian age. The well was drilled with\r\nseawater and hi-vis sweeps down to 906 m, with XP-20/Spersene/Drispac mud from\r\n906 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTwo separate hydrocarbon-bearing\r\nsandstone intervals were encountered in the Late Jurassic Heather Formation. The\r\nOxfordian to Kimmeridgian "Intra Heather Sand I" from 2018 m to 2082\r\nm had gas down to a gas/oil contact at ca 2035 m and oil down-to 2048 m. The\r\nsection below 2048 had silty to shaley sand with 82% water saturation. The OWC\r\ncould be somewhere in this section between 2048 and 2054 m. The Callovian "Intra\r\nHeather Sand II" (Fensfjord Formation) from 2136 to 2246 m had oil (57.7%\r\naverage water saturation) down to a possible OWC at 2172. This section was a\r\nsilty/shaley sand and the net pay was 24 m. Below this the well penetrated 45 m\r\nof Middle Jurassic Brent Group sandstones, a 291 m thick Dunlin Group with sandstone\r\nin the Cook Formationa",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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