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    "wlbNpdidWellbore" : 1717,
    "wlbName" : "30/9-12",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well 30/9-12 is located on the\r\nsouthern part of the Alpha and Gamma structure in the Oseberg Sør area, some 4\r\nkm south of well 30/9-2, and approximately 100 m to the south of the licence\r\nboundary PL 079/104. The main target of the well was to appraise the southern\r\nextension of the Oseberg field, i.e. to improve the seismic mapping of the\r\nAlpha South/Gamma structural complex; to improve stratigraphical mapping and\r\ncontrol of the hydrocarbon bearing Brent Group in the area; to test an\r\noil/water contact in relation to the Oseberg Field and the C-structure; and to\r\ntest communication relations in the Oseberg Field.\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 30/9-12 was spudded with\r\nthe semi-submersible installation Vildkat Explorer on the 7 April 1991 and\r\ndrilled to TD at 2994 m in the Cook Formation of the Dunlin Group. The well was\r\ndrilled with spud mud to 1016 m and with KCl polymer mud from 1016 m to TD.\r\nShallow gas predicted at 184 m proved to be the base of a boulder zone, probably\r\na glacially eroded horizon.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well proved a column of 10.3 m of\r\nmoveable hydrocarbons oil in the Tarbert Formation with an oil down-to contact\r\nat 2674.5 m, However, as no oil/water contact was established, uncertainty\r\nremained as to the amount of hydrocarbon resources within the southern part of\r\nthe Alpha South structure. A total of 70.4 m of net sand was calculated for the\r\nBrent sequence, with an average porosity of 21.5% and calculated average Sw of\r\n26.1% in the Tarbert Formation.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe pressure data obtained from the well\r\nindicated a significant depletion caused by production from Oseberg B.\u003c/p\u003e\r\n\r\n\u003cp\u003eGood oil shows were recorded on cuttings\r\nfrom limestone stringers in the interval 2325 m to 2554 m in the Cretaceous and\r\non sandstones (conventional and sidewall cores) in the interval 2658 m to 2673\r\nm in the Tarbert Formation. A total of 10 conventional cores were cut, one in\r\nthe Heather Formation and nine through the entire Brent sequ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}