{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 403,
    "wlbName" : "31/4-5",
    "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\u003eAppraisal well 31/4-5 was drilled on the\r\n31/4-3 Discovery on the Bjørgvin Arch in the northern North Sea. The primary\r\nobjective was to test "Intra Heather Formation" sands on the "B\r\nstructure" in a crestal position, up dip from the discovery well 31/4-3.\u003c/span\u003e\u003cspan\r\nlang=EN-GB\u003e \u003c/span\u003e\u003cspan lang=EN-GB\u003eThe well was planned to delineate known\r\nhydrocarbons in the "Intra Heather Sand I" (Sognefjord Formation) and\r\nto test the prospect for additional up dip oil and gas reserves in the "Intra\r\nHeather Sand II" (Fensfjord Formation). The well was planned to enter the\r\n"Intra Heather Sand I" reservoir approximately 20 m below the OWC in\r\norder to provide evidence of the extent of the reservoir. The lower oil bearing\r\nzone ("Intra Heather Sand II") was prognosed approximately 20 m\r\nhigher than in well 31/4-3 and significant amounts of up dip oil were thought\r\nto exist. The Brent, Dunlin and Statfjord Groups were secondary objectives,\r\npossibly prospective in an up dip position.\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 31/4-5 was spudded with the\r\nsemi-submersible installation Nortrym on 27 May 1981 and drilled to TD at 2930\r\nm in the Triassic Hegre Group. The well was drilled without significant\r\nproblems. It was drilled with seawater and hi-vis pills down to 926 m, with KCl\r\nmud from 926 m to 1966 m, and with a lignosulphonate/XC polymer/Drispac mud\r\nfrom 1966 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well penetrated the Sognefjord\r\nFormation at 2070 m and the Fensfjord Formation at 2104 m. The Sognefjord\r\nFormation was 8.5 m thick and water bearing, but with good oil shows. The\r\nFensfjord Formation was hydrocarbon bearing with a net sand of 60 m and a net\r\npay of 37 m. The oil/water contact was not possible to define exact",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}