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    "wlbNpdidWellbore" : 1340,
    "wlbName" : "6507/8-4",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6507/8-4 was designed to drill the\r\nHeidrun North Structure, a horst block northeast of the Heidrun Field situated\r\nin the transition zone between the Nordland Ridge to the north and the Halten\r\nTerrace to the southwest. The primary objective of the well was to test\r\nsandstones of Early Jurassic age. The well would also test the geophysical and\r\nstructural interpretation and improve the paleontological, geological and\r\ngeochemical understanding of the area.\u003c/p\u003e\r\n\r\n\u003cp\u003eShallow gas warning was given at 608 m,\r\n745 m and 686 m, the last one classified as a medium/ high risk anomaly. Problems\r\nwith gumbo clay and sloughing shale had been experienced in the Eocene /\r\nPaleocene sections in the Haltenbanken area.\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 6507/8-4 was spudded with\r\nthe semi-submersible installation Deepsea Bergen on 14 June 1990 and drilled to TD at 2560 m in the Triassic Grey Beds. Apart from some tight hole spots,\r\ndrilling proceeded without significant problems. The well was drilled with\r\nseawater and hi-vis sweeps down to 654 m, with seawater and CMC EHV mud from\r\n654 m to 1555 m, with gypsum/polymer mud from 1555 m to 2100 m, and with\r\ngel/ligno mud from 2100 m to TD. Shallow gas was encountered at 596 m and at 686\r\nm. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe only shows reported above the target\r\nreservoir were on claystones at 2102 m and at 2104 m. Top reservoir (Åre\r\nFormation) was encountered directly underlying Late Cretaceous sediments at\r\n2124 m. The hiatus was from the Early Jurassic, Sinemurian to the Late\r\nCretaceous, Santonian. The well proved gas and oil in the Åre formation. The\r\nGOC was set at 2142 m and the OWC at 2251.5 m. Shows continued down to 2290 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eA total of 170.25 m core was recovered in\r\neleven cores, all from the Åre Formation in the interval 2128 to 2318 m. Twenty-five\r\nsidewall cores were attempted and 22 were recovered. An FMT fluid sample was\r\ntaken at 2158.5 m. It contained only 500 cc mud filtrate due to plugging. Another\r\nsample wa",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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