{
  "type" : "Feature",
  "links" : [
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      "rel" : "collection",
      "type" : "application/geo+json",
      "title" : "The collection document"
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    {
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      "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" : "455",
  "properties" : {
    "OBJECTID" : 455,
    "wlbNpdidWellbore" : 463,
    "wlbName" : "25/1-7",
    "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 25/1-7 was drilled on the main Frigg\r\nstructure close to the UK border. The Frigg Field was discovered by well 25/1-1\r\nin 1971. Production from the field started in 1977. Well 25/1-7 was designed to\r\nmonitor the remaining producible gas accumulation in the Frigg Field, and to\r\ndetermine the Frigg Formation heterogeneity north of the producing platforms\r\nincluding the integrity and nature of the barrier between the Frigg sands and\r\nthe Cod aquifer (Hermod Formation). The main objectives were to observe changes\r\nin gas/oil and oil/water contacts as the Frigg Field is produced, and to core\r\nthe whole Frigg and Balder Formations. The prognosed depth was 2700 m.\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\u003eAppraisal well 25/1-7 was spudded with\r\nthe semi-submersible installation Byford Dolphin on 8 March 1985 and drilled to\r\nTD at 2719 m in the Late Cretaceous Jorsalfare Formation. Drilling proceeded\r\nwithout significant problems. The well was drilled water based.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Frigg Formation came in at 1919 m, 34\r\nm deeper than prognosed. The Frigg Formation in this well consist of an upper\r\npart down to 1977 m with fine grained shale interbedded with sand layers; a massive\r\nfine to very fine sand, occasionally micaceous and glauconitic, slightly shaly down\r\nto 2044 m; and a basal part consisting of sand and sandstone (calcareous),\r\noccasionally micaceous, with shale and silt layers down to 2180 m. The oil/water\r\nand gas/oil contacts were in the upper part and were difficult to define from\r\nthe logs due to the shale. The following contacts were however defined for\r\nlater reference: base of deepest gas at 1964.5 m (1938.7 m MSL), top of highest\r\noil at 1965.8 m (1940 m MSL), and top of highest water at 1976.5 m (1950.7 m\r\nMSL). Residual oil was seen down to 1999.5 m.\u003c/span\u003e\u003c/p",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}