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    "wlbNpdidWellbore" : 439,
    "wlbName" : "31/2-15",
    "wlbHistory" : "\r\n\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-15 was drilled in the northern\r\npart of the Troll West oil and gas province to evaluate reservoir quality and\r\ndevelopment in the northern part of the Troll West accumulation, and to\r\nestablish fluid contacts in an undrilled fault compartment. \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 31/2-15 was spudded with\r\nthe semi-submersible installation Borgny Dolphin on 10 September 1984 and\r\ndrilled to TD at 1677 m in the Middle Jurassic Fensfjord Formation. No major\r\nproblems were encountered in the operations. The well was drilled with seawater\r\nand hi-vis pills down to 810 m, with KCl/polymer mud from 810 m to 1460 m, and\r\nwith chalk mud (calcium chloride/calcium carbonate) from 1460 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop reservoir was encountered at 1482 m\r\nas prognosed, but the age of the upper part was found to be of\u00A0 Paleocene and\r\nnot Late Jurassic age. The expected Sognefjord Formation came in at 1515 m. The\r\nwell thus correlate with the situation in well 31/2-18 and 31/2-18 A. Both the\r\nPaleocene sand and the Sognefjord Formation sand were gas filled, and the gas\r\ncontinued down to a low permeable micaceous gas/oil transition zone at 1561 m\r\nto 1567 m. Testing and sampling proved no mobile oil down to at least 1567 m,\r\nand the free oil level was concluded to be very close to the Field-GOC at 1572\r\nm (1547 m SS). The OWC was unambiguously placed at 1583 m, in a highly\r\npermeable sand. No shows were recorded above 1482 m or below 1583 m. From\r\npetrophysical analysis there were indications of gas saturation in poor quality\r\nformation within a 10 m interval below top Fensfjord. However an RFT sample\r\nfrom his interval contained no oil, only gas and brine.\u003c/p\u003e\r\n\r\n\u003cp\u003eTwelve cores were cut from 1486 m to 1595\r\nm from the lower Paleocene, the Late Jurassic and Sognefjord Formation, and\r\ninto the Heather Formation. A total of 4 RFT samples were taken. Of these 2\r\ninitial failed because of tight formation and seal failure while brine and gas\r\nwere recovered from the sam",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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