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    "wlbNpdidWellbore" : 399,
    "wlbName" : "31/2-6",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-6 is located in a fault block\r\nnorth-east on the main Troll structure, approximately 8 km NNE of 31/2-3. The\r\nmain objective of the well was to test the north-eastern margin of the Troll\r\nstructure and to prove hydrocarbon communication between block 31/2 and 31/3.\r\nThe well location was picked to test the oil zone in a good sand reservoir. A\r\nsecond objective was to get reliable geologic tie to the seismic reflectors to\r\nallow for accurate lateral extrapolation of well data. Planned TD was 2500 m in\r\nTriassic sediments. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Reference Well for the Sele\r\nFormation.\u003c/p\u003e\r\n\r\n\u003cp\u003e \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 31/2-6 was spudded with\r\nthe semi-submersible installation Borgny Dolphin on and drilled to TD at 1760 m\r\nin the Late Jurassic Formation. The 9 5/8" casing collapsed at 771 m and\r\nwas cut and retrieved from 760 m. As a result of this, well 31/2-6 was not\r\ndeepened to the Triassic. The well was drilled with seawater gel down to 614 m\r\nand with KCl polymer mud from 614 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-6 proved a similar hydrocarbon\r\naccumulation in this northern fault block area to that of the main field\r\naccumulation tested by wells 31/2-1,2,3 and 4. The well encountered the\r\nSognefjord Formation at 1492 m. The Formation held a 79.4 m gross gas column\r\nunderlain by a 10.3 m oil column. The GOC at 1571.4 m and the OWC was at 1582.2\r\nm. Well 31/2-6 confirmed the overall interpretation of the flatspot as a direct\r\nhydrocarbon indicator. Oils shows were recorded on cores from 1504 m to 1601 m.\r\nIn addition, cuttings gave patchy shows in the interval from 1710 m to 1758 m.\r\nSidewall cores from this interval did not confirm shows in the latter interval.\u003c/p\u003e\r\n\r\n\u003cp\u003eCoring commenced at 1504.4 m and\r\nterminated at 1632.05 m, within the Sognefjord Formation. Thus 127.65 m of core\r\nwas cut from which 123.65 m (97%) was recovered. An RFT gas sample was taken at\r\n1518 m as a backup until samples could be obtained from the subs",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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