{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1669,
    "wlbName" : "31/5-4 S",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/5-4 S was drilled in a southern,\r\ndown flank compartment of the Troll West Gas province, 1000 m north west of\r\nwell 31/5-2. The Troll West Province is an easterly rotated fault block where\r\nthe southern part is approximately 10 x 15 km with a general dip of 1 to 2\r\ndegrees at reservoir level. The primary objective was to provide a penetration\r\nhole for a later test production in a horizontal side track hole in the 13 m\r\noil layer in the Sognefjord Formation. The test production should confirm the\r\noil production potential from the Troll West Gas Province; obtain dynamic data\r\nfrom a potential development type well and obtain static reservoir and\r\ngeological data to provide proper understanding of well behaviour. \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 31/5-4 S was spudded with the\r\nsemi-submersible installation Transocean 8 on 13 September 1990 and drilled to\r\nTD at 1909 m in the Middle Jurassic Fensfjord Formation. No shallow gas was\r\nencountered, as prognosed. The well was drilled vertical down to 1040 m from\r\nwhere angle was built up to 53 deg at 1571 m. Tight hole problems were\r\nexperienced at several depths, and at 1360 m the hole packed off and mud return\r\nwas temporary lost. The well was drilled with seawater and hi-vis pills down to\r\n940 m and with KCl/polymer polyacrylamide mud from 940 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Sognefjord Formation was penetrated from 1619 m (1535.4 m TVD RKB) to 1830 m\r\n(1660 m TVD RB). The formation was gas filled down to 1670 m (1535.4 m TVD RKB)\r\nand oil filled from there down to 1692.3 m (1567.2 m TVD RKB).\u003c/p\u003e\r\n\r\n\r\n\r\n\r\n\r\n\u003cp\u003eThe well bore was plugged back to 1496 m\r\nfor sidetracking. It was permanently abandoned on 10 October 1990 as a gas and\r\noil appraisal well.\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 test was performed\u003c/p\u003e\r\n\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}