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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2612,
    "wlbName" : "25/8-7",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration Well\r\n25/8-7 is located East North-East of the Jotun Field. The two main objectives\r\nfor drilling well 25/8-7 were to test the hydrocarbon potentials of the\r\nsandstones in the Lower Palaeocene Heimdal Formation (Krap prospect) and in the\r\nMiddle Jurassic Hugin Formation.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/8-7 was\r\nspudded with the semi-submersible installation "Dyvi Stena" on 21\r\nJuly 1995 and drilled to a total depth of 2380 m, 40 metres into the Early\r\nJurassic Amundsen Formation. The well was drilled with seawater and high\r\nviscous pills through the 36" and 17 1/2" hole sections down to 1070\r\nm. After setting the 13 3/8" casing the mud system was changed to a 1.27\r\nSG KCL/ polymer system with 3 - 4 % glycol added for drilling the 12 1/4"\r\nand 8 1/2" sections to final TD. No shallow gas or boulder beds were\r\nencountered in the uppermost well section.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated\r\nmainly clays and claystones in the Nordland, Hordaland and Rogaland groups.\r\nGrid Formation sands were encountered from 1293 m to 1348 m and 1484 m to 1504\r\nm. Minor thin distal remnants of the Heimdal Formation sands were encountered\r\nbetween 2050 and 2061.5 metres, however these proved water wet. Top Ty\r\nFormation was reached at 2157 m, consisting of clean sandstone divided by a thin\r\nshale bed. It continued down to top Shetland Group at 2209 metres. No\r\nhydrocarbons were found in the Ty Formation. The Shetland Group consisted\r\nmainly of chalk with the Cromer Knoll Group consisting of limestones\r\ninterbedded with claystones and marls. The Hugin Formation sandstones came in\r\nat 2318 m and were found to be water bearing. Traces of dark brown tarry dead\r\noil staining together with weak, dull yellow fluorescence and slight\r\npetroliferous odour was seen in the Heimdal Formation sands and claystones from\r\n2050 m to 2061.5 m. Similarly traces of dark brown tarry dead oil stained\r\ngrains were described at the top of the Hugin Formation at 2318 ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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