{
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  "links" : [
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      "title" : "The collection document"
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 235,
    "wlbName" : "31/4-7",
    "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 31/4-7 was drilled on the southernmost\r\npart of the Brage Horst, close to the junction between the Brage/Oseberg fault\r\nand the Troll Fault. The primary objective was to test the hydrocarbon\r\npotential and the internal stratigraphy on the Brage Horst compartment on the\r\nwestern flank of the Brage Field. Neighbouring well 31/4-2 to the north on the\r\nBrage Horst found live oil in two thin sandstones in the Brent Group, while\r\nwells 31/4-3, 4, and 5 on the main Brage structure on the Bjørgvin Arch had\r\nproved oil in the "Intra-Heather Sandstone Unit II" (Fensfjord\r\nFormation). The well was planned to be drilled 50 m into the Statfjord Group at\r\n2765 +/- 50 m.\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 31/4-7 was spudded with the\r\nsemi-submersible installation Vildkat Explorer on 26 July 1984 and drilled to\r\nTD at 2505 m in Late Triassic sediments of the Statfjord Group. No significant\r\nproblem was encountered in the operations. The well was drilled with gel/spud\r\nmud down to 1000 m, with KCl/polymer mud from 1000 m to 1816 m, and with a\r\nNaCl/polymer mud from 1816 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well encountered hydrocarbon bearing\r\nsandstones and siltstones in the Fensfjord Formation and in the Statfjord Group\r\nsandstones. The Fensfjord Formation was poorly developed with sandstones\r\ngrading to siltstones followed by siltstones. It was found gas bearing over the\r\ninterval 2026 - 2056 m with a calculated net pay of 8 m, an average porosity of\r\n20.5% and an average water saturation of 45%. The Statfjord Group came in at 2384\r\nm and was found oil bearing down to the OWC at 2406 m. It consisted of fine to\r\ncoarse sandstones. The net pay was calculated to be 12.5 m with a calculated\r\naverage porosity of 22.2% and an average water saturation of 42.3%. \u003c/span\u003e\u003c/p\u003e\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}