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  "LayerName" : "Wellbore - History",
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    "wlbName" : "33/5-1",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe objective of the well, located on the\r\nMakrell horst on the northern margin of the East Shetland Basin, was to test\r\ntwo possible sandstone reservoirs of Triassic and Permo-Triassic age\r\nrespectively. The first of these reservoirs was prognosed to be an Early\r\nTriassic massive sandstone reservoir. Correlation with the U.K. well 211/13-1\r\nindicated that this sandstone could be divided into two main sequences both\r\nwith increasing silt and clay content in the lower parts. These sands were\r\nthought to be deposited in a braided alluvial system. The second was prognosed\r\nto be Permo-Triassic fluvial sandstone similar to the higher reservoir but\r\nseparated from it by lacustrine or lagoonal shales, marls and limestones. The\r\nwell was planned to reach total depth below a seismic marker at approximately\r\n3825 m. \u003c/p\u003e\r\n\r\n\u003cp\u003eWell 33/5-1 is reference well for the\r\nTriassic Teist and Lomvi Formations.\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 33/5-1 was spudded with the\r\nsemi-submersible installation Treasure Seeker on 19 July 1979 and drilled to TD\r\nat 3829 m in the Early Triassic Teist Formation, interpreted to be close to the\r\nseismic "A" marker. A gas leakage from a shallow gas zone at 480 m to\r\n490 m between the 20" and 30" casing was observed sporadically\r\nthroughout drilling of the well. The leakage was stopped when the gas zone were\r\nsqueezed off with cement during abandonment of the well. An 18 1/2" hole\r\nwas first drilled to 1516 m. When pulling out of the hole the string got stuck\r\nat 1226 m and the well was sidetracked from 1019 m to 1071 m. Logs are from the\r\nsidetrack. Further drilling went without significant problems. The well was\r\ndrilled with seawater/bentonite/CMC down to 1540 m. Diesel and lubricants were\r\nadded to the mud when attempting to free the stuck pipe. A\r\nlignosulfonite/lignite mud was used from 1540 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eA sequence of interbedded limestones of\r\nEarly Tertiary to Late Cretaceous age (Late/Middle Paleoc",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}