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    "wlbName" : "31/5-3",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/5-3 was drilled in the southern\r\npart of the Troll West Field. The main objectives were to appraise and test the\r\nreservoir qualities and the lithology of the Late Jurassic Sognefjord\r\nFormation. \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 31/5-3 was spudded with the\r\nsemi-submersible installation Treasure Saga on 10 April 1984 and drilled to TD\r\nat 2250 m in the Late Jurassic Drake Formation. At 1426 m circulation was lost,\r\nand 450 bbls mud was lost to formation before the well was stabilized. The well\r\nwas drilled with spud mud down to 950 m, with KCl/polymer mud from 950 m to\r\n1497 m, and with a Pro-wate/NaCl-brine/pro-salt mud from 1497 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well proved the existence of a\r\nstratigraphy ranging from Lower Jurassic to Quarternary. The Tertiary and\r\nQuaternary sections were mainly composed of claystones, with a minor sand\r\ndeveloped in Pleistocene at the base of the Nordland Group. The Jurassic was\r\ncomposed of sandstone and siltstones in the Viking and Brent Groups, and mainly\r\nclaystone with an interbedded sandstone layer in the Dunlin Group. One major\r\nunconformity was found between Early Portlandian and Maastrichtian. Four other\r\nunconformities were also observed in the well, from Aalenian to Bathonian, from\r\nEarly Kimmeridgian to Early Portlandian, from Late Oligocene to Pliocene, and\r\none intra-Oligocene.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Sognefjord Formation was hydrocarbon\r\nbearing with a 39.5 m hydrocarbon column, of which 17.5 m was gas and 22 m was\r\noil. Top reservoir was found at 1555 m, the GOC was at 1572.5 m, and the OWC at\r\n1594.5 m. Oil shows persisted further down, but decreased from 1595 m and\r\ndisappeared below 1622 m. No other interval in the well was hydrocarbon\r\nbearing.\u003c/p\u003e\r\n\r\n\u003cp\u003eThree cores were cut from 1550 m to\r\n1622.5 m in the Late Jurassic Sognefjord Formation. FMT gas samples were taken\r\nat 1557 m and 1567. Three more FMT fluid samples were taken in the oil zone at\r\n1577 m, 1591 m, and at 1592 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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