{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "396",
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    "wlbNpdidWellbore" : 401,
    "wlbName" : "31/4-2",
    "wlbHistory" : "\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 31/4-2 is a replacement for junk\r\nwell 31/4-1. The well is located on the Brage Horst between the Oseberg and\r\nTroll Fields in the Northern North Sea. The primary objective was Middle\r\nJurassic sandstones of the Brent Formation. A "flat-spot" was seen on\r\nthe seismic sections and tentatively interpreted to represent a gas fluid\r\ncontact in these sandstones. A secondary objective was sandstones in the Early\r\nJurassic Statfjord Formation. Sandstone intervals of upper Early Jurassic age\r\n(Dunlin Formation) and of Triassic age (Hegre Group), were also expected to be\r\npenetrated, but were not considered to be prospective. The well was planned to\r\nbe drilled to a depth of 2930 m RKB (+/- 90 m), ca 100 m into the Triassic.\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 31/4-2 was spudded with the\r\nsemi-submersible installation Norskald on 26 September 1979 and drilled to TD\r\nat 2900 m in the Triassic Lunde Formation. There were some problems with\r\nkeeping position and anchor movements in rough weather, but otherwise\r\noperations went forth without significant problems. The well was drilled with Seawater\r\nand pre-hydrated bentonite down to 990 m, with Seawater/Drispac/pre-hydrated\r\nbentonite from 990 m to 1712 m, and with seawater/prehydrated\r\nbentonite/ligcon/Unical mud from 1712 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eGood oil shows were recorded on sidewall\r\ncores from thin sandstone stringers at 2061 to 2069 m in the upper part of the\r\nShetland Group. The well penetrated top Draupne Formation at 2146 m and top\r\nHeather Formation at 2171 m. The Heather Formation contained a 49 m thick very\r\nfine to silty water-bearing sandstone interval from 2190 to 2239 m. The well\r\npenetrated two hydrocarbon bearing sandstone intervals at 2325 to 2329 m and\r\n2344.5 to 2354 m within a 29 m thick Mi",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}