{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 186,
    "wlbName" : "25/11-4",
    "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 25/11-4 was drilled ca 2.6 km south-south\r\nwest of the 25/11-1 Balder discovery well on the Utsira High in the North Sea.\r\nThe objective was to define the continuity of oil bearing sands of Early Eocene\r\nage that were present in 25/11-1 well.\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 25/11-4 was spudded with\r\nthe vessel Glomar Grand Isle on 15 October 1970 and drilled to TD at 1896 m in\r\nthe Early Paleocene Ekofisk Formation. Drilling operations were normal down to 963\r\nm and at that depth problems with the Hydril necessitated pulling the riser and\r\nupper part of the B.O.P. stack. While drilling at 1753 m weather conditions\r\nhampered drilling and it was necessary to again pull the riser and upper part\r\nof the stack. After losing several days due to weather conditions the well was\r\ncompleted, however, during the midst of the logging operations, storm warnings\r\nmade it necessary to shorten the program and the planned velocity survey was\r\nnot made. Initial drilling from the seafloor to 179 m was with sea water and\r\ngel. Below 179 to a depth of 948 m, the mud system consisted of seawater,\r\nSpersene XP-20 Salinex. From 948 m to TD fresh water Spersene XP-20 mud was\r\nused.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well penetrated the Utsira Formation\r\nand several Skade Formation sand units and then entered a ca 500 m thick\r\nsection of shales belonging to the lower Hordaland Group before top Balder\r\nformation was encountered at 1695 m. The Balder Formation (Early Eocene) proved\r\nalmost void of reservoirs. It was all silty shale except a 4 foot sand section\r\nbetween 1740 and 1742 m. This sand had a good oil stain, bright yellow\r\nfluorescence and a bright yellow cut. The only massive reservoir present was\r\nthe Paleocene Hermod Formation sand from 1792 to 1816 m. This sand had no\r\nhydrocarbon",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}