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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 478,
    "wlbName" : "30/9-5 S",
    "wlbHistory" : "\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eGeneral\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 30/9-5 S was drilled on the\r\n"J" prospect close to the western margin of the Horda Platform. The\r\nstructure is bounded by Jurassic strata dipping down into the north, east and south\r\nand by the main Horda Platform fault to the west. The primary objective was to\r\nprove hydrocarbon accumulation in the Etive Formation of the Brent Group.\r\nSecondary objectives were possible hydrocarbons in sandstones if present in the\r\nHeather-Drake- and Cook Formations.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eOperations and results\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWildcat well 30/9-5 S was spudded with\r\nthe semi-submersible installation Treasure Seeker on 27 May 1985 and drilled to\r\nTD at 2980 m (2963 m TVD) in the Triassic Hegre Group. Due to shallow gas\r\nindications on the site survey seismic the well location was moved approximately\r\n150 m. The well was then deviated from a kick off point at 1000 m to reach the\r\nplanned target. No significant problem was encountered in the operations. The\r\nwell was drilled with seawater and gel down to 910 m, with KCl/polymer mud from\r\n910 m to 1935 m, and with NaCl/polymer mud from 1935 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well encountered a gas bearing Cook\r\nFormation and minor amounts of gas in the Brent Group. No additional\r\nhydrocarbon bearing reservoirs were encountered by the well. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Brent Group (2236-2253 m, 2222-2239 m\r\nTVD) was found severely eroded in the well with poorly developed sands. The net\r\nsand distribution is limited to a thin layer at the top of the formation. The\r\nrest of the formation appears to be very silty. The gross thickness is 17 m\r\nwith a net pay of only 0.5 m. The average porosity is 20.2% and the water\r\nsaturation 58.2%. The Cook Formation (2447-2466 m, 2433-2452 m TVD) has\r\nmoderately good reservoir qualities in the upper p",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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