{
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  "LayerName" : "Wellbore - History",
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    "wlbName" : "1/3-4",
    "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\u003eWildcat well 1/3-4 was drilled on the\r\nnorthern part of the Hidra High in the North Sea. The objective was to test the\r\nhydrocarbon potential of the Danian and late Cretaceous Chalk, on a domal structure\r\ninduced by halokinesis.\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 1/3-4 was spudded with the\r\nsemi-submersible installation Dyvi Alpha on 15 February 1983 and drilled to TD\r\nat 3198 m in the Late Permian Zechstein Group. While drilling through Middle\r\nMiocene claystones, the average background gas increased rapidly from 5% to 80%\r\nbetween 1580 m and 1595 m and, at this depth, the mud weight had to be\r\nincreased gradually from 1.37 to 1.50 - 1.53 to lower the gas content. Furthermore,\r\nto stop the gas leakage and to isolate the weak zone, it was decided to set the\r\n13 3/8" casing. Logs were run (ISF/BHC and LDT/CNL) and the casing was set\r\nwith shoe at 1557 m. While circulating after the logging a gain of 1 m3 with\r\ngas and more than 100 litres of oil occurred. To stabilize the well, 2 cement\r\nplugs and 4 barite plugs were set, in order to stop the gas leaking from the\r\nformation. In total, twenty days were spent on circulating, logging (ISF/BHC\r\nand LDT/CNL), setting the 13 3/8" casing, and plugging before drilling of\r\nthe 12 1/4" section commenced. While drilling the 12 1/4" hole, the\r\nbackground gas varied between 32 and 84% down to 1695 m where the mud-weight\r\nwas raised to 1.60. The background gas then decreased between 10 and 25% and\r\ndrilling continued normally. Logs performed at the end of the 12 1/4"\r\nphase and covering the zone of interest are strongly affected by large cavings\r\nand by barite squeezed into the formation. Side wall core recovery was very\r\npoor from the caved zone. The well was drilled water based.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe first ev",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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