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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1026,
    "wlbName" : "31/4-9",
    "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 31/4-9 was drilled as an appraisal\r\nwell on the Brage Field on the Bjørgvin Arch in the North Sea. The main\r\nobjective was to establish the OWC and confirm reservoir trends, hydrocarbon\r\ncolumn and reserve potential in the east flank of the structure. TD was\r\nprognosed at 2500 m, 70 m into the Dunlin Group.\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0 \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 31/4-9 was spudded with\r\nthe semi-submersible installation Polar Pioneer on 23 January 1987 and drilled\r\nto TD at 2480 m in the Early Jurassic Drake Formation. No significant problem\r\nwas encountered in the operations. The well was drilled with spud mud down to\r\n974 m, with KCl/polymer mud from 974 m to 2027 m, and with NaCl/CaCO3/polymer\r\nmud from 2027 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Fensfjord reservoir came in at 2168.5\r\nm and consisted mainly of fine to medium grained sandstones grading into and\r\ninterbedded with siltstones. The Fensfjord Formation was oil bearing down to\r\nthe oil-water contact at 2172 m. The Brent sandstone was found to be water\r\nbearing. Oil shows were described in the cored sections from 2103.5 m in the Draupne\r\nFormation down to 2222 m in the Fensfjord Formation.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eAn attempt to take two cores in the Tertiary\r\nclaystones failed. Eight cores were cut with good recovery in the interval 2103\r\nto 2222 m in the Heather and Fensfjord formations. RFT oil samples were taken\r\nat 2171.5 m topmost in the Fensfjord Formation\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was permanently abandoned on 7\r\nMarch 1987 as an oil appraisal well.\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\u003eTwo drill stem tests were performed ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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