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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2026,
    "wlbName" : "34/7-21",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 34/7-21 was drilled the\r\nsouth-western part of block 34/7 on Tampen Spur, on the H-prospect northwest of\r\nthe Tordis Field. The main objective was to test the hydrocarbon prospectivity\r\nwithin the Late Jurassic (Viking Group) interval. The target was a Late\r\nJurassic sand wedge, truncated in the up-dip direction towards the east by the\r\nBase Cretaceous Unconformity. Sufficient amounts of reservoir sand were\r\nconditioned by erosion and re-sedimentation from the underlying Middle Jurassic\r\nBrent Group, which is progressively truncated up-dip in the same direction. The\r\nsecondary objective was to test the Paleocene in which an oil discovery had\r\nbeen made in well 34/7-18.\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 34/7-21 was spudded with the semi-submersible\r\ninstallation Treasure Saga on 19 October 1992 and drilled to TD at 3015 m in\r\nthe Early Jurassic Drake Formation. Tight and sticky formation was reported in\r\nthe 12 1/4" section, but no significant technical problems occurred in the\r\noperations. Based on the site survey, possible shallow gas was predicted at\r\n298, 548 and 612 m. The MWD confirmed a gas bearing sand at 541 m - 548 m. A\r\nflow check proved negative. The well was drilled with spud mud down to 1113 m\r\nand with KCl polymer mud from 1113 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eIn the Nordland, Hordaland, and Upper\r\nRogaland Groups, the well penetrated mainly clay/claystone with minor sand,\r\nexcept for the sandy Utsira Formation between 929-1040 m. At the base of the Rogaland\r\nGroup, the Lista Formation sandstone was encountered and proven dry, but with\r\nshows. In the Shetland and the condensed Cromer Knoll Group, claystone with\r\nlimestone beds and massive marls/limestones were penetrated, respectively. A\r\nhydrocarbon-bearing interval was proven in a sand in the Cromer Knoll at 2498-2501\r\nm. The top of the Late Jurassic reservoir was reached at 2508 m, which was 29 m\r\nshallower than prognosed. Within the Draupne Formation, two separate oil\r\nbearing sandstone i",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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