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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1351,
    "wlbName" : "2/8-12 S",
    "wlbHistory" : "\r\n\r\n\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 2/8-12 S was drilled on the eastern\r\nflank of the Middle and Late Jurassic "Mode" salt feature in a\r\nlocation ca 12 km north of the Valhall Field. The well was planned deviated to\r\navoid the Ekofisk-Emden gas pipeline. The objective of the well was to test the\r\nreservoir and possible hydrocarbon potential in the Late and Middle Jurassic\r\nsands in the deepest part of the Central Trough, determine the source rock\r\npotential and maturation as well as the Jurassic stratigraphy, and determine\r\nthe Late Cretaceous/Tertiary stratigraphy of the chalk section.\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 2/8-12 S was spudded with\r\nStena Equipment semi- submersible installation Dyvi Stena on 7 November 1988\r\nand drilled to TD at a total depth of 5300 m in the Triassic Group. The\r\nwell was drilled with seawater down to 904 m, with seawater/PAC/PHPA from 904 m\r\nto 3360 m, with seawater/Low Lime fro 3360 m to 4024 m, and with\r\nfreshwater/Hoestadrill mud from 4024 m to TD. Shallow gas was encountered in sands\r\naround 930 meters. The well was stabilised with heavy mud, and there was no\r\ndamage or injuries. \u003c/p\u003e\r\n\r\n\u003cp\u003eA major normal fault cuts through the\r\nchalk section and caused major problems with lost circulation. Later\r\nbiostratigraphic analyses showed that most of the Hod Formation was faulted out\r\nin the well. The lower Cretaceous section was thicker than expected due to a\r\n241 m of unexpected Early Cretaceous limestone/dolomite (Tuxen Formation). The\r\nLate Jurassic shales of the Tyne Group was encountered at 4000 m and proved to\r\nbe 1191 m thick, which also was thicker than expected. It consisted of the\r\nMandal (42 m), Farsund (165 m) and Haugesund (985 m) Formations. The lithology\r\nof the group was generally silty claystone/shale with dolomite/limestone\r\nstringers. Organic geochemical analyses of cuttings proved very good source\r\nrock potential throughout the whole Group, with the better potential found in\r\nthe Mandal and Farsund Formations. Top of the",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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