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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 377,
    "wlbName" : "30/4-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/4-1 is located north of the Hild\r\nDiscovery and west of the Oseberg Field. The main target was Middle Jurassic\r\nsandstones in a complex fault and dip-controlled closure. Secondary targets\r\nwere Palaeogene sands (Balder and Sele Formations) and possible Late Jurassic\r\nsands, both in simple dip closures. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 30/4-1 was spudded with the\r\nsemi-submersible installation SEDCO 707 on 1 November 1978 and drilled to TD at\r\n5454 m in the Early Jurassic Dunlin Group. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated a mainly argillaceous\r\nPalaeogene section. However, a distinct interval of interbedded thin\r\nargillaceous water-bearing sandstones (beds 1 - 3 m thick) with thicker\r\nmudstone intervals was drilled between 2116.5 and 2162.5. The net/gross ratio\r\nof this interval was about 0.2 (20%) and the sandstone porosities average\r\naround 30% (from Schlumberger logs). The well then penetrated a thick\r\nargillaceous Cretaceous and Late Jurassic interval. No Late Jurassic sandstones\r\nwere developed. Water bearing, Middle Jurassic sandstones of the Brent\r\nGroup were encountered at 5181.5 m. This target group was 218.2 m\r\nthick, had a net/gross ratio of about 0.66 (66%) and had sandstone porosities\r\nranging from around 4-16% (from Schlumberger logs). Shows were recorded in\r\nlimestones in the interval 2545 m to 2570 m, with weaker shows extending down\r\nto 2630 m. Weak shows were also noted in the interval 2900 m to 3000 m.\r\nGeochemical analyses of cuttings confirmed migrant "medium gravity oil"\r\nin the interval 2570 m to 2630 m. No conventional cores were cut. Wire line RFT\r\nsamples were attempted but all failed.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned as dry\r\non 14 May 1979.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo drill stem test was performed\u003c/p\u003e\r\n\r\n\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}