{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 325,
    "wlbName" : "15/9-4",
    "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 15/9-4 was drilled on in the southeastern\r\npart of the Sleipner Vest area in the Viking Graben of the North Sea. Previously\r\nfour wells had been drilled on the Sleipner Alpha structure in the north. Two\r\nof these showed significant gas-condensate accumulations (15/6-3 and 15/9-1) in\r\nthe middle Jurassic while in the western part of the Alpha structure the sand\r\nhad shaled out (15/9-3). In the northeast, the sand was penetrated below the\r\nhydrocarbon/water contact (15/6-5). The first well drilled on the Beta prospect\r\n(15/9-2) showed a significant gas-condensate column in the middle Jurassic\r\nsand. The primary objective for well 15/9-4 was to test possible hydrocarbons\r\nin Middle Jurassic sandstones in the southeast extending Delta structure. \u00A0\u00A0\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\u003eWell 15/9-4 was spudded with the semi-submersible\r\ninstallation Ross Rig on 4 April 1979 and drilled to TD at 3716 m in the\r\nTriassic Skagerrak Formation. Very few problems were encountered during\r\ndrilling of this well, with the exception of lost circulation in the 26"\r\ninterval. This problem was solved by pumping cement into the formation. The\r\nmain problem arose only after drilling the 8 1/2” interval. The 7" liner\r\nwas run and cemented sucessfully. When pressure was applied in order to test\r\nthe liner lap, the 9 5/8" casing burst. The well was drilled with spud mud\r\ndown to 415 m and with gel/lignosulphonate mud from 402 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop of the Middle Jurassic Vestland\r\nGroup, Hugin Formation was penetrated at 3441 m. The section contained\r\nsandstones with good reservoir properties interbedded with some thin shale\r\nbeds. The sandstones were hydrocarbon bearing with a gas-water contact at ca\r\n3570 m, 7 m into the Sleipner Formation. Weak oil shows were described\r\nt",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}