{
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    "wlbNpdidWellbore" : 252,
    "wlbName" : "2/4-8",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 2/4-8 was drilled on the crest of\r\nthe Tor Discovery structure in the southern Norwegian North Sea. The principal\r\nobjective was to confirm the thick Danian-Cretaceous productive section present\r\nin the Amoco 2/5-1 well and to provide a means of evaluating the maximum\r\nanticipated productive section in the Tor Discovery. Jurassic sandstone was\r\nalso defined as principal objective, while secondary prospects could exist in\r\nPaleocene sands. Prognosed top Jurassic was at 3691 m (12110 ft) with planned\r\nTD at 4572 m (15000 ft). \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 2/4-8 was spudded with the\r\njack-up installation Zapata Explorer on 25 November 1971. The original spud\r\nlocation was 56 deg 38' 15.6'' N, 03 deg 18' 48'' E. This hole was drilled to\r\n570 m at which point the well kicked and bridged off. The drill pipe became\r\nstuck at 486 m and the hole was abandoned with the top of fish at 323 m. The\r\nrig was moved 120 meters east where the well was re-spudded and drilled to\r\nfinal TD at 4078 m in the Permian Zechstein Group. The well was drilled with\r\nseawater and hi-vis mud down to 488 m, with drill aid / DAP (di-ammonium\r\nphosphate) mud from 488 m to 1623 m, with drill aid / gypsum mud from 1623 m to\r\n2211 m, with drill aid from 2211 m to 2984 m, with a lignosulphonate mud from\r\n2984 m to 3810 m, and with Drispac / salt saturated mud from 3810 m to TD.\r\nBelow 488 m 2 -6 % diesel was added to the mud.\u003c/p\u003e\r\n\r\n\u003cp\u003eAt 2946 m the well penetrated a 3 m fine\r\ngrained Paleocene sand with a calcite matrix. This sandstone exhibited a dull\r\nyellow fluorescence and a slow cut. Danian chalk was encountered at 2985 m and\r\nLate Cretaceous chalk was encountered at 3086 m. Gas and oil was tested from\r\nthe Danian - Late Cretaceous chalk. Continuous zones of oil shows were observed\r\non all cores down to 3203 m, below this depth shows were scattered.\u003c/p\u003e\r\n\r\n\u003cp\u003eTwenty cores with a total recovery of 176\r\nm core were cut in the interval 2985 to 3242 m in Danian and Late Cretaceous\r",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}