{
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      "title" : "The collection document"
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "821",
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    "wlbNpdidWellbore" : 1986,
    "wlbName" : "25/8-4",
    "wlbHistory" : "\r\n\r\n\r\n\r\n\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 25/8-4 was drilled o the Utsira\r\nHigh, in the vicinity of the Balder Field area in the North Sea. The main\r\nobjective was to test the hydrocarbon potential of the Paleocene sand in the\r\nHedila structure, a seismic mounded structure within the prospect area. The\r\nlocation of the well was chosen in an area were thick sands were expected to be\r\nfound in a high structural position. Additional targets were additional younger\r\nsand development in the Lista and Sele Formation.\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\u003eWildcat well 25/8-4 was spudded with the\r\nsemi-submersible installation Vildkat Explorer on 25 July 1992 and drilled to\r\nTD at 1891 m in the Late Cretaceous Hod Formation. No significant problems were\r\nencountered during operations. The well was drilled with spud mud down to 241 m\r\nand with polymer mud from 241 m to TD. No shallow gas was observed.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Lista Formation was encountered at\r\n1710 m. A sequence of thin Heimdal Formation injection sands was recognised in\r\nthe Lista Formation in the interval down to 1780 m where a 50 m thick massive Heimdal\r\nFormation was encountered. In total these injection sands made up 5.9 m net\r\nsand, which was all hydrocarbon bearing. Average porosity in this net was 32.0%\r\nwith an average Sw of 10%. The main Heimdal Formation was found mainly water\r\nwet, with only a 1.5 m oil column from the top and down to an OWC at 1781.5 m\r\n(1756.5 m TVD MSL). Average porosity in the main Heimdal Formation was 33.9%. Oil\r\nshows in the Paleocene sandstones started to appear in top Balder Formation at\r\n1670 m and ended in the OWC in the Heimdal sandstone at 1782 m. In addition, poor\r\nshows were observed on limestone over the interval 1841 m - 1852 m in the\r\nEkofisk Formation.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003e",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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