{
  "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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      "title" : "This document as text/html"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "493",
  "properties" : {
    "OBJECTID" : 493,
    "wlbNpdidWellbore" : 502,
    "wlbName" : "31/2-4 R",
    "wlbHistory" : "\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 31/2-4 is located some 10 km NNW of\r\nthe discovery well 31/2-1 in a separate fault compartment near the crest of the\r\nJurassic gas accumulation. This crestal area appeared also to coincide with the\r\nculminations of all deeper horizons that could be mapped. The well had two main\r\nobjectives. The first was to appraise the Jurassic gas accumulation in the\r\n31/2-1 Troll Discovery in a location with nearly maximum gross hydrocarbon\r\ncolumn. The well should test lateral variations in this reservoir. The second\r\nmajor objective was to explore deeper Triassic/Palaeozoic Formations. The well\r\nwould test possible hydrocarbon accumulations under the Late Jurassic Troll\r\nreservoir, explore possible pre-Jurassic source rocks, and provide geological\r\nages for deep horizons and thus improve the regional geological setting. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTD of the well was proposed to be 5000 m\r\nbelow sea level or in Palaeozoic formations whatever came first. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 31/2-4 was originally drilled with\r\nBorgny Dolphin down to 815 m in 1980. The well was however suspended on 13\r\nSeptember 1980 due to a blow out on 34/10-10, where Borgny Dolphin's services\r\nwere immediately required.\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\u003eWell 31/2-4 was re-entered (31/2-4 R)\r\nwith the semi-submersible installation Borgny Dolphin on 9 October 1980 and\r\ndrilled to TD at 5035 m in Early Triassic sediments of the Hegre Group. The\r\nwell bore deviation did not exceed 4 deg and at 4693 m, the deepest survey\r\npoint reported, there was only 2 m difference between drilled and true vertical\r\ndepth. The top hole down to 815 m had previously been drilled with seawater and\r\nhi-vis pills. From 815 m to 1280 m the well was drilled with KC/polymer mud,\r\nfrom 1280 m to 1951 m it was drilled wi",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}