{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 356,
    "wlbName" : "25/2-4",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/2-4 was drilled in the north west\r\ncorner of block 25/2. It lies on the eastern flank of the Viking basin in the\r\nViking Graben and to the east of the Frigg Field and Frigg Kitchen. The main\r\ntargets was the Jurassic with a mapped seismic structure of 30 ms vertical\r\nclosure and 30 square km acreage spreading on the Shell block 30/11. Well\r\n25/2-4 was located on the west flank near the top of the structure. Agreement\r\nwith Shell management was signed for a bottom hole contribution with obligation\r\nfor the operator to reach the Triassic red shales or to set TD at 3360 m. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Reference Well for the Drake\r\nFormation.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 25/2-4 was spudded with\r\nthe semi-submersible installation Neptune 7 on 14 may 1975 and drilled to TD at\r\n4384 m in the Triassic Smith Bank Formation. The well was drilled water based\r\nwith salt/gel/Flosal/seawater down to 733 m and with FCL/LC mud from 733 m to\r\nTD. At 3375 m the well kicked due to an under balanced hydrostatic mud\r\npressure.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well penetrated Danian, Paleocene and\r\nEoceneá sandstone sequences (Frigg Formation, Intra Balder Formation\r\nSandstones, Hermod and Ty formations). All these sands were water wet without\r\nshows. In the Late Cretaceous limestones were found fairly well developed\r\noverlying a thick shaly and marly sequence with some more limestone levels,\r\nparticularly in the Campanian and Turonian. The latter limestones contained\r\nsignificant shows, but a production test proved tight formation. The Kimmerian\r\nunconformity was penetrated at 3632 m with 8 m Draupne shale. In the Jurassic\r\ntwo reservoir sandstone sequences were encountered: the Vestland Group and the\r\nStatfjord Formation. The Vestland sequence was first interpreted as oil and gas\r\nbearing from 3640 m to 3708 m (Hugin Formation) with a probable gas/oil\r\ncontact 3660 m and an oil/water contact between 3704 m to 3708 m. Net pay in\r\nthe 25/2-4 Hugin reservoir was estimated around 40 m w",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}