{
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "31",
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    "OBJECTID" : 31,
    "wlbNpdidWellbore" : 32,
    "wlbName" : "31/5-2",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/5-2 is a replacement well for well\r\n3/5-1 in the southern part of the Troll West Field. Well 31/5-1 was terminated\r\nat 860 m and junked due to an incident where the BOP and riser was lost. Due to\r\nthis, the rig left the location and went to Bergen for repairs. It returned to\r\nthe location five days later for drilling 31/5-2. The purpose of the well was to\r\ntest the reservoir qualities, the oil/gas columns, and the hydrocarbon/water\r\ncontact in the area. \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 31/5-2 was spudded with\r\nthe semi-submersible installation Treasure Saga on 5 October 1983 and was\r\ndrilled to TD at 2500 m in the Late Triassic Hegre Group. A total of 5 days\r\nwere lost on setting the 18 3/4" x 9 5/8" seal-assembly, otherwise no\r\nsignificant technical problems occurred in the operations. The well was drilled\r\nwith seawater and hi-vis pills down to 860 m and with KCl/polymer mud from 860\r\nm to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/5-2 penetrated top reservoir at\r\n1521 m. The interval 1521 - 1569 m was gas bearing with 30% porosity and 15%\r\nwater saturation. The interval from 1569 - 1582 m was oil bearing with 27%\r\nporosity and 30% water saturations. These intervals were the only hydrocarbon\r\nbearing intervals in the well. Between 1569 and 1582 m there were good shows in\r\nthe cores. They showed brown oil stain, golden-yellow fluorescence and instant\r\ncloudy, milky, white cut. There was strong hydrocarbon odour.\u003c/p\u003e\r\n\r\n\u003cp\u003eA total of six cores were taken in the\r\ninterval 1505.0 -1599.9 m, covering the basal 16 m of the Draupne Formation and\r\nthe upper 78 m of the Sognefjord Formation. The core recovery was 81%. FMT\r\nsegregated fluid samples were taken at 1563 m (gas), 1575 m (oil at 135 bar),\r\nand 1581 (oil at 90 bar).\u003c/p\u003e\r\n\r\n\u003cp\u003eAfter surveying, logging and sidewall\r\ncoring, the well was plugged back to 1902 m and suspended on 11 November 1984.\r\nThe well was to be re-entered at a later stage for testing.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo drill stem ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}