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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1523,
    "wlbName" : "35/11-4",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 35/11-4 was designed to drill at a\r\nsite located in block 35/11 which is situated on the eastern flank of the\r\nViking Graben and northwest of the Horda Platform. The regional structural\r\ngenerally trends north-south, with some north-northeast components. Planned TD\r\nwas 3317 m, which was prognosed to be near top Triassic. The primary objective\r\nfor 35/11-4 was the Middle Jurassic Brent Group. Reservoirs were expected in\r\nthe Tarbert, Ness, Etive and Oseberg formations. Secondary targets were\r\npossible sand development of Sognefjord Formation sand in the Late Jurassic as\r\nwell as Paleocene sand mounds.\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 35/11-4 was spudded with the\r\ndynamically positioned semi-submersible installation Yatzy on 18 August 1990\r\nand drilled to TD at 3127 m in the Early Jurassic Statfjord Formation. Yatzy\r\nwas the first dynamically positioned drilling unit used offshore Norway and\r\n35/11-4 was the rig's first well. This implied significant rig time spent on\r\ntesting and down time due to failure of first-time equipment. At a depth of\r\n2072 m one decided to sidetrack the well from 1700 m in order obtain cores from\r\nthe hydrocarbon bearing zones of the Sognefjord formation. This led to a\r\nmaximum deviation of 5.7 deg at 1765 m. The well was drilled with seawater and\r\nviscous pills down to 1009 m and with KCl/polymer mud from 1009 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe Lower Eocene consisted of a\r\ncontinuous argillaceous sequence and no reservoir rocks were penetrated. At\r\n1647 m good reservoir quality sandstones were found in the Paleocene Lista\r\nFormation but they were not hydrocarbon bearing. Poor shows were observed in\r\nlimestones of the Cretaceous Shetland Group. A total of four\r\nhydrocarbon-bearing zones were discovered in the Jurassic: in the Sognefjord\r\nFormation in the original hole and in the Sognefjord, Fensfjord Formations and\r\nBrent Group in the sidetrack hole. Mud log shows were recorded in most of the\r\nsandstone intervals from 1984 meters to",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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