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    "wlbNpdidWellbore" : 1078,
    "wlbName" : "6507/7-9",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6507/7-9 was drilled in the Northern\r\npart of the Haltenbanken area, near the crest of the Heidrun Field structure,\r\nat the proposed site for the production platform. The well was a pilot hole for\r\nthe Heidrun Field production wells. It should evaluate the top 150 m of\r\nsediments below seabed as foundation for the Heidrun Production Platform, and\r\nit should drill to 850 m RKB to ensure that the section to be penetrated by the\r\nconductors and surface pipes for all production wells, is free of shallow gas.\r\nA site survey had detected five shallow gas anomalies at 505, 558, 609, 708,\r\nand 762 m.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 6507/7-9 was spudded with\r\nthe semi-submersible installation Treasure Hunter on 4 August 1987 and drilled\r\nto TD at 850 m in Pliocene sediments of the Naust Formation. No significant\r\nproblems were encountered during drilling. The well was drilled all through\r\nwith seawater and pre-hydrated bentonite and returns to the seabed. A sub-sea\r\ncamera was monitoring the wellhead area. \u003c/p\u003e\r\n\r\n\u003cp\u003eBoulders were encountered between 380 m\r\nand 400 m, but created no torquing problems while drilling. Wire line logs\r\nidentified sands at 600 to 612 m, at 695 to 698 m, and at 749 to 757 m. Gas\r\nbubbles were observed emanating from the wellhead while drilling the sand at\r\n600 - 612 m. The gas bubbles decreased after drilling the section and ceased\r\nwhile circulating seawater around to the seabed, indicating hydrostatic\r\npressure. The other sands produced no gas bubbles to surface, and none of the sands\r\nshowed any signs of high resistivity. It was concluded that shallow gas should\r\nnot be a problem in drilling future wells from the Heidrun Platform on this\r\nlocation, although shallow gas-filled sands in neighbouring locations could not\r\nbe excluded. \u003c/p\u003e\r\n\r\n\u003cp\u003eNo cores were cut and no wire line fluid\r\nsamples taken in this well.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 8\r\nAugust 1987 as a dry well\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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