{
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "21",
  "properties" : {
    "OBJECTID" : 21,
    "wlbNpdidWellbore" : 22,
    "wlbName" : "31/6-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe primary objectives of the wildcat\r\n31/6-1 was to test Late and Middle Jurassic sandstones on the main culmination\r\nof the Troll east structure in the western part of block 31/6. Secondary\r\nobjectives were Middle to Early Jurassic and Triassic sandstones and a possible\r\nsandstone reservoir of pre-Triassic age within a set of tilted fault blocks\r\nburied by Triassic strata. The Troll east structure is a large tilted fault\r\nblock containing Jurassic and older strata. The closure\u003c/p\u003e\r\n\r\n\u003cp\u003eat Sognefjord Formation level is\r\ndelineated by a flatspot covering most of the 31/6 block. The flatspot was\r\nexpected to be a gas/fluid contact evident on the seismic and penetrated by\r\nnine wells in the Troll West area to the NNW in block 31/2. Planned TD of the well\r\nwas 3800 m into rocks of pre-Triassic (? Devonian age).\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 31/6-1 was spudded with the\r\nsemi-submersible installation Nortrym on 15 July 1983 and drilled to TD at 4070\r\nm in pre-Devonian basement rock. Problems with getting logging tools past the\r\n30" casing shoe occurred due to gumbo problems. Further drilling went\r\nforth without major problems. The well was drilled with spud mud down to 425 m,\r\nwith seawater / prehydrated gel and hi-vis pills from 425 m to 749 m, and with\r\nKCl/polymer/PHPA mud from 749 m to TD \u003c/p\u003e\r\n\r\n\u003cp\u003eThe total net sand in the Viking Group\r\n(1352-1805 m) found to be 424.25 m giving a net/gross ratio of 0.94 m with an\r\naverage porosity of 27.5%. The Sognefjord Formation (1352-1488 m), the Heather\r\nFormation Unit B, (1488-1517.5 m) and the upper part of the Fensfjord Formation\r\nwere found gas bearing from 1352 to 1571 m where the gas/oil contact was found.\r\nBelow this a thin (3 m) oil zone was present with an oil/water contact at\r\napproximately 1574 m. The hydrocarbon-bearing reservoir consisted of very fine\r\nto fine grained sandstones, occasionally medium to coarse. They were generally\r\nfriable to loose with a few tight calcite cemented stringers. The",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}