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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2059,
    "wlbName" : "31/5-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was drilled as part of the\r\nappraisal programme initiated for the southern part of the Troll West Gas\r\nprovince (TWGP-S). The objectives of the well were to provide geological,\r\ngeophysical and petrophysical data for evaluation of the potential for a group\r\nof oil producers in TWGP-S; and to provide data on the Fensfjord and Krossfjord\r\nFormations to improve aquifer modelling. The well was further planned for later\r\nre-entry, either for sidetracking and completion as a horizontal producer, or\r\nfor vertical recompletion for Sognefjord Formation reservoir monitoring.\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 31/5-5 was spudded with the\r\nsemi-submersible installation West Delta on 30 December 1992 and drilled to a\r\ntotal depth at 1930 m in the Middle Jurassic Krossfjord Formation. The well was\r\ndrilled with spud mud to 940 m and with KCl/brine from 940 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Sognefjord Formation was encountered\r\nfrom 1572 m to 1725 m, and was hydrocarbon bearing. Strong oil shows were\r\nrecorded from 1573 m to1587.5 m, weaker oil shows were recorded below this\r\ndepth down to 1650 m. The gas-oil contact was identified at 1573.5, and the\r\noil-water contact was identified at 1585.5 m. From FMT pressure tests a gas\r\ngradient of 0.152 g/cc, an oil gradient of 0.825 g/cc, and a water gradient of\r\n1.02 g/cc was defined. Twelve conventional cores were cut. The first ten were\r\nfrom 1555 m in the top of the Sognefjord Formation to1726 m, one meter into the\r\nFensfjord Formation. Cores 11 and 12 were cut from 1835 m in the Fensfjord\r\nFormation to 1888 m in the Krossfjord Formation. FMT fluid samples were taken\r\nat 1583 m (two samples, both contained oil and gas), 1576.5 m (oil and gas),\r\nand at 1571 m (gas). \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was temporarily plugged at 1450\r\nm and 450 m using two 9 5/8" Baker type N1 bridge plugs and suspended as\r\nan oil and gas appraisal well on 11 February 1993.\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"
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