{
  "type" : "Feature",
  "links" : [
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      "rel" : "collection",
      "type" : "application/geo+json",
      "title" : "The collection document"
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      "rel" : "self",
      "type" : "application/geo+json",
      "title" : "This document as JSON"
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      "type" : "text/html",
      "title" : "This document as text/html"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "468",
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    "OBJECTID" : 468,
    "wlbNpdidWellbore" : 476,
    "wlbName" : "34/10-23",
    "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 34/10-23 was drilled on the Gullfaks\r\nGamma structure, south-southeast of the Gullfaks Sør Field in the Northern\r\nNorth Sea. The objectives were to prove a significant hydrocarbon accumulation,\r\nwith the Brent Group as the primary target and the Early Jurassic as secondary target.\r\nThe first well on the structure, well 34/10-20, had the same targets as\r\n34/10-23, but was terminated in the Early Cretaceous due to technical problems.\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 34/10-23 was spudded with\r\nthe semi-submersible installation Dyvi Delta on 6 May 1985 and drilled to TD at\r\n4764 m into Sinemurian /possibly Rhaetian age sediments of the Statfjord\r\nFormation. The well took 28 days more than prognosed to drill. The main part of\r\nthe extra time came in the 8 1/2" section, where among many other things,\r\nthe BOP stack was pulled for inspection and repairs. A flow occurred at 4080 m just\r\nabove top Brent Group, and approximately three days were used to bring the well\r\nunder control. At 4409 m (4406.5 m TVD RKB) the deviation exceeded 5 deg. The\r\nlast survey, at 4514 m (4510.8 m TVD RKB) m showed 9.1 deg deviation. If this\r\ndeviation is extrapolated the vertical depth at TD is 4756.2, ca 8 m short of\r\nmeasured depth. The well was drilled with seawater and hi-vis pills down to\r\n1252 m, with gypsum/lignosulphonate mud from 1252 to 3118 m, and with\r\ngypsum/lignosulphonate/lignite mud from 3118 m to 4525 m. At 4509 m the pipe\r\nstuck, and imco-spot/pipelax pills with 3% diesel were placed to free it. The\r\nfinal section from 4525 m to TD was drilled with a\r\ngel/lignosulphonate/lignite/Anco Resin mud system. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe pore pressure increased through the\r\nentire Cretaceous section and reached a maximum of 1.96 g/cc at the top of the\r\nBrent Group. Gas bearin",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}