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    "wlbNpdidWellbore" : 105,
    "wlbName" : "31/6-5",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/6-5 was drilled in the southern\r\npart of the Troll East gas province, 30 m from well 31/6-4, which was junked\r\nfor technical reasons. The main purpose was to appraise and test possible oil\r\nand gas accumulations in sandstones of Late to Middle Jurassic age, and to give\r\nfurther information about lateral facies changes within the reservoir\r\nsandstones. \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 31/6-5 was spudded with\r\nthe semi-submersible installation Deepsea Bergen on 5 March 1984 and drilled to\r\nTD at 2082 m in the Early Jurassic Drake Formation. In the 26" hole lost\r\ncirculation occurred at 653 m, two cement plugs were set. Several wiper trips\r\nwere taken due to tight hole. After setting of the 20" casing, the BOP had\r\nto be repaired due to leaking during pressure testing. A drilling break\r\noccurred at 1476 m in the 12 1/4" hole. The well was drilled with the spud\r\nmud from the previous hole (31/6-4) treated with CMC-EHV down to 389 m, with\r\nseawater/gel mud from 389 m to 663 m, with KCl/polymer mud from 663 m to 1720\r\nm, and with seawater/gel/CMC mud from 1720 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eSandstone of Late to Middle Jurassic age\r\n(Sognefjord Formation) was encountered at 1518 m with a 52 m gas column and a 4\r\nm oil column. The gas/oil contact was at 1570 m and the oil/water contact at\r\n1574 m. Oil shows were recorded on sidewall cores on top Fensfjord Formation\r\nsandstone from 1722 m to 1726 m and on a sandstone SWC from 2010 m in the Ness\r\nFormation. Ten cores were cut from 1470 m to 1721 m in the Late to Middle Jurassic\r\nsequence (Heather Formation to Fensfjord Formation). One FMT fluid sample was\r\ntaken in the oil zone 1571.5 m. Geochemical analyses showed the oil to be\r\nbiodegraded.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 16\r\nMarch 1984 as a gas and oil appraisal.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Sognefjord Formation was tested\r\nthrough gravel pack from the interval 1558 m to 1568 m. The first test gave a\r\nnon-representative",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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