{
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "823",
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    "wlbNpdidWellbore" : 1988,
    "wlbName" : "31/2-18",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe purpose of well 31/2-18 was to appraise the structure\r\nand oil bearing potential of a fault block in the northern part of the Troll\r\nWest Gas province (TWGP). The objectives for drilling well 31/2-18 were to\r\nevaluate the structure for future development of oil producing wells in the\r\nTWGP-North area, and to determine the degree of development required to\r\nefficiently develop the oil reservoir in the TWGP-North area. Well 31/2-18A was\r\ndrilled as a pre-planned sidetrack to Well 31/2-18 in order to evaluate the\r\nhydrocarbon potential of the Krossfjord Formation. The primary objective of the\r\nsidetrack was to evaluate a seismic anomaly, or "flat spot" which had\r\nbeen identified in the Krossfjord Formation. The location of the anomaly was situated\r\n240 m to the northeast in an up thrown block, adjacent to the original well.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 31/2-18 was spudded with\r\nthe semi-submersible installation "Treasure Saga" on 15 September\r\n1992, and drilled to a total depth of 1711 m in the Middle Jurassic Fensfjord\r\nFormation. The well was drilled with seawater and hi-vis pills down to 940 m\r\nand with KCl/Polymer mud from 940 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003ePalaeocene sand was encountered below\r\nbase Våle Formation, from 1519.9 m to 1528.8 m. This sand is in direct contact\r\nwith the underlying Late Jurassic Sognefjord Formation, which was encountered\r\nover the interval 1528.8 m - 1642.7 m. Gas was proven all through these sands\r\nfrom top of the Palaeocene sand down to 1571.2 m in the Sognefjord Formation. A\r\nthin oil leg was identified, with an oil-water contact at 1582.0 m. Sixteen\r\ngood RFT pressure measurements, including segregated samples at 1575 m and 1582\r\nm, were taken in one run over the interval 1522 m & 1689.5 m. The interval\r\nfrom 1498 m to 1678.5 m (Lower Rogaland Group including the Palaeocene sand,\r\nSognefjord Formation, and Heather Formation) was cored in twelve cores with 86\r\n100 % recovery. \u003c/p\u003e\r\n\r\n\u003cp\u003eAfter running wire line lo",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}