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    "wlbNpdidWellbore" : 1770,
    "wlbName" : "30/9-12 A",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 30/9-12 A was designed as a\r\nsidetrack from well 30/9-12 on the Alpha South structure on the southern\r\nextension of the Oseberg Field. Well 30/9-12 proved a 10 m column of oil in the\r\nTarbert Formation, but as no oil/water contact was established there remained\r\nuncertainty as to the amount of hydrocarbon resources within the southern part\r\nof the Alpha South structure. The objectives of well 30/9-12A were to sidetrack\r\napproximately 700 m down dip south-eastwards in order to establish the water\r\npressure and oil/water contact in the Tarbert Formation in the area as well as\r\nto verify the structural mapping and geological model of the area. No drilling\r\nhazards were anticipated. \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 A was with kicked\r\noff with the semi-submersible rig Vildkat Explorer on 9 May 1991. Kick-off\r\npoint was at 1033 m, below the 13 3/8" casing shoe in well 30/9-12. The\r\nwell bore was drilled to a total depth of 3061 m (2927 m TVD RKB) in the Drake\r\nFormation of the Dunlin Group. It was drilled with KCl polymer mud from\r\nkick-off to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well encountered an unexpected\r\nHeather Formation sandstone development that proved to be hydrocarbon bearing.\r\nA total of 2.63 m net pay sand was calculated, with an average porosity of 23.3%\r\nand average water saturation of\u003c/p\u003e\r\n\r\n\u003cp\u003e31.4%. Sandstones of the Brent Group were\r\npenetrated below the regional oil/water contact and were found to be totally\r\nwater bearing. A total of six conventional cores were cut in this well in the\r\ninterval 2874 m to 2919 m in the Tarbert and Ness Formations. A total of 30\r\nsidewall cores were attempted and 28 were recovered. Drilling went on without\r\nany significant problems to TD. Oil was recovered from RFT samples taken at\r\n2776.3 m and 2776.6 m. Geochemical analyses showed the Heather oil in 30/9-12 A\r\ncorrelate very well with Tarbert oils from 30/9-12 and 30/9-10, indicating a\r\ncommon source and identical maturity.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was suspen",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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