{
  "type" : "Feature",
  "links" : [
    {
      "href" : "https://factmaps.sodir.no/api/rest/services/Factmaps/FactMapsWGS84/OGCFeatureServer/collections/254/items?f=application%2fjson",
      "rel" : "collection",
      "type" : "application/geo+json",
      "title" : "The collection document"
    },
    {
      "href" : "https://factmaps.sodir.no/api/rest/services/Factmaps/FactMapsWGS84/OGCFeatureServer/collections/254/items/381?f=json",
      "rel" : "self",
      "type" : "application/geo+json",
      "title" : "This document as JSON"
    },
    {
      "href" : "https://factmaps.sodir.no/api/rest/services/Factmaps/FactMapsWGS84/OGCFeatureServer/collections/254/items/381?f=text/html",
      "rel" : "alternate",
      "type" : "text/html",
      "title" : "This document as text/html"
    },
    {
      "href" : "https://factmaps.sodir.no/api/rest/services/Factmaps/FactMapsWGS84/OGCFeatureServer/collections/254/items/381?f=application/geo+json",
      "rel" : "alternate",
      "type" : "application/geo+json",
      "title" : "This document as application/geo+json"
    }
  ],
  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "381",
  "properties" : {
    "OBJECTID" : 381,
    "wlbNpdidWellbore" : 386,
    "wlbName" : "30/7-3",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/7-3 was drilled in the Fensal\r\nsub-basin south-southeast of the Hild Discovery and north of the Odin\r\nDiscovery.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe main objective of the well was to\r\ntest a mapped seismic anomaly below the "Ml" marker, prognosed to be\r\na possible porous carbonate development at Cenomanian level. The location of\r\nthe well gave a test of the anomaly on the western edge, according to the\r\nseismic mapping. Secondary objectives were possible Early Cretaceous\r\nsand/limestone pinch-outs and Late Jurassic sands.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well 30/7-3 was spudded with the\r\nsemi-submersible installation Polyglomar Driller on 6 August 1976 and drilled\r\nto TD at 4044 m in the Early Cretaceous (Albian - Aptian) Cromer Knoll Group.\r\nWhen drilling the 12" hole at 3001 m, a leak was discovered in the\r\nwellhead. A groove was cut in the sealing area between the wellhead and the\r\ncollet connector. A wellhead extension was run in the damaged wellhead with\r\nfour o-rings as seal towards the original wellhead. The drilling was continued\r\nand 9 5/8"casing was set at 3782 m. While drilling 8-3/8" hole at\r\n4044 m circulation was lost. When the mud weight was reduced in an attempt to\r\nre-establish circulation the well started to flow. A barite plug was set at\r\nbottom, and this finally stabilized the well. The well was drilled with\r\nfreshwater gel to 700 m and with lignosulphonate mud from 700 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eA comparison of the results from the\r\nseismic velocity survey and the seismic interpretations identify the interval\r\nbetween 3795 m and 3918 m as the target seismic anomaly. In this interval a\r\nsequence of limestone, marlstone and shale was found. The limestone is composed\r\nof mainly calcite with recognisable coccoliths. In the lower part minor\r\nterrigenous components of quartz sand and silt, and mica flakes were\r\nencountered. In places the limestone became very argillaceous grading to\r\nmarlstone and shale. No visible porosity or any hydrocarbon s",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}