{
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      "rel" : "collection",
      "type" : "application/geo+json",
      "title" : "The collection document"
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "86",
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    "wlbNpdidWellbore" : 88,
    "wlbName" : "31/2-9",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-9 was drilled northeast\r\nof the well 31/2-7 in the Troll West oil province in the Northern North Sea. The\r\nmain objectives were to establish the extent of a previously proven thick oil\r\ncolumn province in the Troll Field and to complete the well near the OWC in\r\norder to follow the development of water coning. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-9 was spudded with the semi-submersible\r\ninstallation Borgny Dolphin on 29 August 1982 and drilled to TD at 1770 m in the Late Jurassic Fensfjord Formation. Some problems\r\nwere encountered with the well head after running the 20" casing (2.5 days\r\nlost), and with the BOP after running the 13 3/8" casing (3.5 days lost). The\r\nwell was drilled with spud mud down to 460 m, with seawater and gel from 460 m\r\nto 816 m, with KCl/polymer mud from 816 m to 1509 m, and with seawater/Drispac\r\nmud from 1509 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-9 encountered a hydrocarbon bearing column of\r\n34.5 m in the Late Jurassic Sognefjord Formation. The reservoir was gas bearing\r\nfrom 1549 -1570 m (21 m gas column) and oil bearing down to 1583.5 m (13.5 m\r\noil column). This was a thinner oil column than expected. The gas reservoir\r\nconsisted of very fine to medium grained bioturbated sandstones with a high\r\nmica content. The sandstones were very silty and well sorted. Around 1570 m a\r\nchange in lithology to medium/ coarse grained sandstones with low mica content\r\nand less bioturbation was seen. In the lower part of the oil reservoir the mica\r\ncontent was slightly more than in the upper part and the sandstones were siltier.\r\nBelow the OWC shows (moderate to very weak direct fluorescence) were observed\r\non cores throughout the cored section down to 1628 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eFive fiberglass sleeved cores were taken in the 12\r\n1/4" section from 1554 to 1628 m. Four RFT runs were made and 5 samples\r\nwere obtained: at 1573 m (29 deg API oil), 1571 m (oil), 1565 m (gas), and two\r\nsamples at 1575 m (oil)\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently ab",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}