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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1703,
    "wlbName" : "25/4-6 S",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/4-6 S was planned to prove the\r\nhydrocarbon potential in a structure located on the northern extension of the\r\nHeimdal Ridge. The structure is located in the NE corner of block 25/4, fairly\r\nclose to the Heimdal, Frøy and Frigg Fields. Four-ways closures were mapped on\r\nall levels from the "Near top Frigg sequence" marker to the Base\r\nVestland Group Marker. The structure above the Base Cretaceous Unconformity is\r\na fairly simple dome/mounded feature, while the Vestland Group and deeper\r\nsections consist of an antithetic tilted block. The objective of the well was\r\nto explore all closures down to at least Vestland Group level. The primary\r\ntarget was the Vestland Group; secondary targets were the Frigg and Heimdal\r\nFormations, while the Statfjord Formation was a third, optional target. Based\r\non data from surrounding wells, no abnormal pressure was expected. To achieve\r\nan optimal position in reaching the targets the well was planned deviated. \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 25/4-6 S was spudded with\r\nthe semi-submersible installation West Vanguard on 15 April 1991 and drilled to\r\nTD at 4170 m, 41 m into the Statfjord Formation. The well was drilled vertical\r\n(max 2 deg deviation) through the Frigg and Heimdal prospects down to 2424 m. From\r\nhere angle was built up to a maximum of 22.5 deg at 3025 m before it was\r\ndropped off again to 3 deg at final TD. The hole opener cone was lost at 266 m\r\nresulting in 8 days and 15 hours lost time before drilling could be resumed.\r\nThe FMT tool got stuck at 3836 m with fishing unsuccessful. Thus it was decided\r\nto set a cement plug on top of the tool and perform a sidetrack. The well was\r\ndrilled with seawater and viscous pills down to 197 m, with bentonite mud from\r\n197 m to 1220 m, with KCl/polymer mud from 1220 m to 2503 m, and with\r\nlignosulphonate mud from 2503 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Early Eocene Frigg reservoir was not\r\nfound, and the Palaeocene Heimdal reservoir was water bearing. Top Vestland",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}