{
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      "rel" : "collection",
      "type" : "application/geo+json",
      "title" : "The collection document"
    },
    {
      "href" : "https://factmaps.sodir.no/api/rest/services/Factmaps/FactMapsWGS84/OGCFeatureServer/collections/254/items/395?f=json",
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "395",
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    "wlbNpdidWellbore" : 400,
    "wlbName" : "31/4-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/4-1 is located on the Brage Horst\r\nbetween the Oseberg and Troll Fields in the Northern North Sea. The primary\r\nobjective was Middle Jurassic sandstones of the Brent Formation. A "flat-spot"\r\nwas seen on the seismic sections and tentatively interpreted to represent a gas\r\nfluid contact in these sandstones. A secondary objective was sandstones in the Early\r\nJurassic Statfjord Formation. Sandstone intervals of upper Early Jurassic age\r\n(Dunlin Formation) and of Triassic age (Hegre Group), were also expected to be\r\npenetrated, but were not considered to be prospective. The well was planned to\r\nbe drilled to a depth of 2930 m RKB (+/- 90 m), 100 m into the Triassic.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/4-1 was spudded with the semi-submersible\r\ninstallation Norskald on 9 September 1979 and drilled to TD at 1000 m in Late\r\nOligocene - Miocene sediments of the Hordaland Group. \u003c/p\u003e\r\n\r\n\u003cp\u003eNone of the objectives were tested due to\r\ntechnical problems; the well was plugged and abandoned due to lack of cement support\r\naround the 30" casing, experienced when landing the 20" casing. No\r\ncores were cut and no wire line fluid samples were taken.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 25 September 1979 as a junk well. The rig was moved over 100 - 150 m in a direction 213\r\ndegree N to spud replacement well 31/4-2.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo drill stem test was performed.\u003c/p\u003e\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}