{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 154,
    "wlbName" : "1/3-1",
    "wlbHistory" : "\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eGeneral\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 1/3-1 was drilled on the crest of a\r\nsalt-induced anticline on the Hidra High in the North Sea. The purpose of the\r\nwell was to investigate Tertiary and Mesozoic sequences down to top salt.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well is Type Well for the Våle, Hidra,\r\nHod, and Tor Formations, and Reference Well for the Vidar, Ekofisk and Blodøks Formations.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eOperations and results\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 1/3-1 was spudded with the four leg\r\njack-up installation Orion on 6 July 1968 and drilled to TD at 4877 m in the\r\nPermian Zechstein Group. From the deviation survey it is seen that the well\r\nstarts to deviate significantly at 4037 m (8 deg deviation), and at TD the\r\ndeviation is 18 deg. This will correspond to a TVD RKB that is ca 25 m less\r\nthan MD RKB.\u003c/span\u003e\u003cspan lang=EN-GB\u003eSeveral drilling\r\nproblems occurred during the drilling operations of well 1/3-1. While drilling\r\nthe 17 1/2" hole for the 20" casing, circulation losses started at\r\n220 m (720') and became total at 238 m (781'). While drilling on with sea\r\nwater, without returns, the pipe stuck. The lost circulation zone eventually\r\nhad to be sealed off with a cement plug. In the Tertiary plastic clays the\r\nproblems included tight hole conditions, bit balling, and difficulties in\r\nlowering the logging tools. The mud weight had to be raised from 10.8 ppg to 13.6\r\nppg to stabilize the hole. At 4131 m (13554') the bit twisted off, but was\r\nretrieved on the second fishing run. A hydrocarbon bearing zone was encountered\r\nat 4567 m (14984'). The mud became gas cut. At 4592 m (15064') the degasser was\r\noverloaded and the circulation lost, probably higher in the hole. A cement plug\r\nwas needed to combat the lost circulation problems. It was then decided to set\r\na 7" casing. Circulation was lost while running the casing, which had ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}