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    "wlbNpdidWellbore" : 2796,
    "wlbName" : "6407/1-4",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6407/1-4 was drilled primarily to\r\nappraise the 6407/1-3 Tyrihans Nord Discovery. The specific target was to\r\nencounter a free oil-water-contact in the Garn Formation. Secondary objective\r\nwas to gather information from the possibly oil bearing Campanian sandstone\r\ninterval (Nise Formation).\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 6407/1-4 was spudded with\r\nthe semi-submersible installation Byford Dolphin on 6 June 1996 and drilled to\r\nTD at 3805 m in the Middle Jurassic Not Formation. Due to a labour conflict the\r\nMWD services was not run in the top hole down to 810 m. In addition 183 hrs rig\r\ntime was lost during the strike. The well was drilled with seawater and\r\nprehydrated bentonite sweeps down to 816 m, from 816 m to 1810 m with ANCO 2000\r\nmud, and with oil based Ancovert mud from 1810 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe upper part of the Nise Formation was\r\ndominated by siltstone with abundant thin laminas of very fine sandstone and\r\nrare limestone stringers. From 2560 m the siltstone progressively grades to\r\nclaystone, becoming 100 % claystone at 2620 m. Top Garn reservoir came in 101 m\r\nthick at 3675 m, 18 m deep to prognosis, so rock-volume above proven OWC was\r\nreduced. The reservoir was more cemented than expected. Trace fluorescence and\r\ncrush cut was recorded in a single siltstone cutting sample from the Springar\r\nFormation at 2470 m, otherwise no shows were seen above the shales and\r\nclaystones of the Late Jurassic Spekk and Melke Formations. Gas on oil on water\r\nwas encountered in the Garn Formation reservoir. The gas/oil contact was at\r\n3681 m, while the oil/water contact was at 3705 m. No shows were recorded below\r\nthe OWC. One conventional core was cut from 2498 m to 2526 m in the Nise\r\nFormation. Two conventional cores were cut across both fluid contacts from\r\n3679.0 m to 3740.0 m in the Garn Formation, A FMT water sample was taken below\r\nthe OWC at 3709 m. Two segregated FMT samples were taken to collect gas (3679.2\r\nm) and oil (3691.2 m).\u003c/p\u003e\r\n\r\n\u003c",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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