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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2552,
    "wlbName" : "30/9-18",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/9-18 is located on the Bjørgvin\r\nArch south of the Oseberg Sør Field and North of the 30/9-16 K Oseberg Sør\r\nDiscovery. This is in the Northern North Sea. The well was drilled to clarify\r\nthe Oseberg Sør development strategy. The primary objective was to establish\r\nthe extent of the high-permeability Tarbert reservoir found in well 30/9-16.\r\nSecondary objectives were to test the lower Brent Group, the Cook Formation,\r\nand the Statfjord Formation. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/9-18 was spudded with the semi-submersible\r\ninstallation Treasure Saga on 14 March 1995 and drilled to TD at 2994 m in the\r\nLate Jurassic Drake Formation. The 24" hole was drilled from 193 m MD to\r\n557 m MD. Shallow gas was predicted at 590 m MD. The 18 5/8" casing was\r\nset at 547 m MD. As the cement was displaced bubbles from the hole was observed\r\nindicating shallow gas. Displaced out the entire cement volume and filled the\r\nannulus with 1.3 sg mud. Mixed and pumped gas block cement around. The well was\r\ndrilled with spud mud down to 557 m and with KCl/polymer mud from 557 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eFormation tops in the Tertiary and\r\nJurassic sections came in slightly higher than prognosed. However, they were\r\nwithin the prognosed uncertainty range. The well penetrated the Brent Group\r\nreservoir zones and they were water bearing. Very weak oil shows were reported in\r\nthe interval 2640 to 2780 m in the Heather/Tarbert intervals during drilling.\r\nIntra Heather Sandstone and Tarbert Formation combined contained 127 m gross\r\nsand (67.5 m net). The Ness Formation was 195 m thick with 54.5 m net sand. The\r\nCook and Statfjord Formations were not drilled. RFT formation pressures gave\r\nthree distinct and separate water gradients, one covering the Intra Heather sandstone/Tarbert\r\nFormation and two separate gradients covering the Ness Fm. The three water\r\ngradients indicated that there was possibly no pressure communication between\r\nthe three zones. No cores were cut and no wire line",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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