{
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      "title" : "The collection document"
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      "type" : "application/geo+json",
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "366",
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    "wlbNpdidWellbore" : 371,
    "wlbName" : "25/11-11",
    "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 25/11-11 was drilled to appraise the\r\nBalder Field on the Utsira High in the North Sea. The objective was to\r\nestablish the presence of an accumulation of oil sand in the western part of\r\nthe Balder Field,\u003c/span\u003e\u003cspan lang=EN-GB\u003e \u003c/span\u003e\u003cspan lang=EN-GB\u003eand evaluate\r\nthe geologic concept of sand-shale distribution and reservoir quality. The top\r\nof the reservoir was anticipated to be at 1708 m MSL.\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 25/11-11 was spudded with the\r\nsemi-submersible installation Glomar Biscay II on 18 February 1981 and drilled\r\nto TD at 1960 m in the Danian age chalk of the Ekofisk Formation. The well was\r\ndrilled with seawater and gel/lignosulphonate.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eOne main oil sand of Paleocene age (Heimdal\r\nFormation) was encountered at 1754 m (1729 m TVD MSL). It was 141.5 m thick and\r\nwas oil-bearing in the upper 29 m down to an OWC at 1783 m (1758 m TVD MSL).\r\nThis OWC was in agreement with the general field OWC in the area. Average\r\nporosity in the oil sand was 32.6%. Shows of hydrocarbons were also present in a\r\n16 m thick Intra Balder Formation Sandstone with top at 1698 m, and in thin\r\nsand stringers within the Sele Formation.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eNo cores were cut and no wire line fluid\r\nsamples were taken.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was permanently abandoned on 18\r\nMarch as an oil appraisal.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eTesting\u003c/span\u003e\u003c/b\u003e\u003cspan lang=EN-GB\u003e \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eNo drill stem test was performed.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}