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    "wlbNpdidWellbore" : 522,
    "wlbName" : "6407/6-2",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6407/6-2 was drilled on a structure\r\nin the western part of the block. The structure has two distinct highs, and the\r\ntarget for this well was on the northern high. The primary objective for the\r\nwell was to test possible hydrocarbon accumulation in sandstones of middle\r\nJurassic age (Fangst Group). Secondary objectives were seen in sands near base\r\nCretaceous (Cromer Knoll Group), in Early Jurassic sandstones (Tilje\r\nFormation), in sandstones within the Åre Formation, and in the Triassic Grey-\r\nand Red Beds. The top hole and Tertiary sections of this well were expected to\r\ncontain shallow gas, possibly at a depth of 570 m. Possibly, also swelling,\r\noverpressured Early Eocene Red/Brown claystone could be encountered. The\r\nprognosed depth was 4150 m, or rocks of Triassic 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\u003eWildcat well 6407/6-2 was spudded with\r\nthe semi-submersible installation West Vanguard on 4 October 1985. It was\r\nabandoned at a depth of 523 m due to a blow out. The blow out probably was\r\ncaused by gas from a shallow sand pocket at 505 m. Gas samples from the blow\r\nout were analysed and found to be gas generated by bacteria at shallow depths.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe 20" casing had not yet been set\r\nso the blow-out preventer (BOP) had not been installed when the incident\r\nhappened. At 20:50 hours in the evening an increase in the penetration rate\r\nfrom 40 to 700 m/hour was observed. Drilling was immediately stopped and the\r\nbit pulled out of hole. The hole was circulated for 35 minutes. A 3-m3 mud loss\r\nwas observed. After gas had been circulated out drilling of a 12 1/4"\r\npilot commenced from 508 m to 516 m. Here background gas again increased. After\r\nagain circulating out the gas drilling continued to 524 m where the drill\r\nstring was pulled out 15 m for a new stand connection. The well now started\r\nflowing uncontrolled and pumping of kill mud started. This did not stop the\r\nblow out. Gas flowed onto the deck of the rig and at 23:20 hours the gas\r\nexploded.",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}