{
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 78,
    "wlbName" : "31/2-8",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-8 was drilled in the northern\r\npart of block 31/2, some 3 km NW of the Troll Field boundary, to test a\r\ndownthrown Jurassic fault-block outside the Troll Field. The primary objective\r\nwas the Late Jurassic, shallow marine sands of the Viking Group, especially the\r\nSognefjord Formation. The Early Jurassic was secondary objective and would be\r\nevaluated by drilling into Triassic sediments. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 31/2-8 was spudded with the\r\nsemi-submersible installation Borgny Dolphin on 16 June 1982 and drilled to TD\r\nat 3375 m in the Triassic Hegre Group. A gas zone (confirmed by logs) between\r\n510 - 530 m did not cause any problems during drilling of the 14 3/4"\r\npilot hole. Maximum gas reading through this zone was 10 %. The hole was\r\ndrilled to 840 m and under-reamed to 26" without incident. The 17\r\n1/2" section was drilled first by an 8 1/2" pilot hole down to 1063 m\r\nto provide better control when drilling through a potential gas charged fault\r\nplane. No indications of gas were seen. 3 cores were taken in the 12 1/4"\r\nsection. Two washouts occurred when drilling the 8 1/2" hole below 3317 m.\r\nThe well was drilled with seawater gel down to 840 m, with KCl/polymer from 840\r\nm to 1745 m, with seawater and Drispac from 1745 m to 2743 m and wit\r\nDrispac/lignosulphonate from 2743 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eOnly 13 m of Shetland Group chalk was found on top of the Kimmerian unconformity at 1821 m. The Viking\r\nGroup contained a 15.5 m thick Draupne shale on top of a 680 m thick sequence\r\nof sandstone units interbedded in the Heather Formation. The Middle to Early\r\nJurassic was also well developed. Shows occurred sporadically in limestones,\r\nsiltstone, and claystones through the Early Tertiary and Late Cretaceous. When\r\nentering into the Late Jurassic reservoir sands at 1836.5 m (Sognefjord\r\nFormation) ditch gas readings went up to more than 4% from a background lower\r\nthan 1%, but without oil indications in the upp",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}