{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 242,
    "wlbName" : "1/6-4",
    "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 1/6-4 was drilled in the southernmost\r\npart of the Breiflabb Basin in the North Sea. The objective was to evaluate a\r\nlarge low relief base Tertiary - Late Cretaceous structure with potential\r\nreservoirs both in the Danian - Late Cretaceous Chalk and in the Paleocene\r\nSands. The primary target was the Chalk (Ekofisk and Tor formations).\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 1/6-4 was spudded with the\r\nsemi-submersible installation Chris Chenery on 29 December 1975 and drilled to\r\nTD at 3810 m in the Late Cretaceous Tor Formation. The drilling of 1/6-4 was\r\nbeset with rig mechanical problems, most notably failures in the mooring system\r\ninduced by adverse North Sea weather. All in all 34 days (ca 33%) of the total\r\nrig time on the well was counted as down time. The well was drilled with bentonite/seawater\r\nspud mud down to 437 m and with lime/Drispac/seawater mud from 437 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop Rogaland Group, Balder Formation,\r\ncame in at 3110 m. A Paleocene sandstone, Andrew Formation was penetrated from\r\n3197 to 3253 m. Top Shetland Group, Ekofisk Formation, came in at 3374 m. The Balder\r\nFormation (Tuff marker) had some residual hydrocarbons up to 30%. This was\r\nsubstantiated by gas readings and some shows of fluorescence in ditch cuttings.\r\nThe underlying Andrew Formation sandstones were found 100% water-bearing. Both the\r\nDanian and Maastrichtian were fully water bearing based on petrophysical\r\nanalyses. This was in agreement with the lack of oil/gas shows while drilling\r\nin this section.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eNo cores were cut and no wire line fluid\r\nsamples were taken.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was permanently abandoned on 9\r\nApril 1978 as a dry well with shows.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp cla",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}