{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 366,
    "wlbName" : "25/11-5",
    "wlbHistory" : "\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 25/11-5 was drilled ca 4 km north\r\nwest of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The\r\nwell was designed to evaluate a sand build up and/or structural closure at the\r\nMiddle Paleocene horizon top. The location was mapped structurally high to the\r\nadjacent wells 25/11-1, 25/11-2, 25/10-1, and 25/10-3.\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 25/11-5 was spudded with the\r\ndrillship Drillmaster on 3 April 1974 and drilled to TD at 2164 m in Triassic red-grey\r\nclays, and grey-green shale. Sloughing shale was the only drilling problem and\r\nthis was overcome by converting the Drispac mud system to a ligno-gel seawater\r\nmud system. The well was drilled with Drispac from approximately 1000 to 1400\r\nm, and with lignosulphonate/gel/seawater from ca 1400 m to TD.\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 a Skade Formation sand and then entered a ca 700 m thick section of shales\r\nbelonging to the lower Hordaland Group before top Balder formation was\r\nencountered at 1661 m. Significant oil bearing sands in the interval from 1714 to\r\n1771 m were confirmed by sidewall cores and Schlumberger electric logs. The\r\nlower part of this interval tested oil at good rates. Additional shows in traces\r\nof sand in cuttings at 1838 - 1847 m were believed to be sloughings from the\r\noil sand above. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eOne conventional core was cut from 1723.3\r\nto 1725.5 m. Six attempts at FIT's were attempted with one successful at 1744.1\r\nm. This test recovered 0.33 Sm3 gas, 4.5 l oil, 2.3 l filtrate and 0.8 l mud.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was permanently abandoned on 8\r\nMay1974 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\u003c",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}