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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 352,
    "wlbName" : "25/1-6",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 25/1-6 is located 12 km\r\nsouthwards of the 25/1-1 well and 6 km south of the Frigg Field boundary. The\r\nmain objective was a Paleocene seismic structure underlined by a strong\r\ndiscontinuous flat seismic event.\u003c/p\u003e\r\n\r\n\u003cp\u003eGeological correlations and geophysical\r\nstudies indicated a detritic sand body belonging to the Heimdal formation. The\r\nCod or Heimdal clay layer could be the closure of this structure.á The\r\nstructurally closed Frigg, Cod, and Danian Sands, and Late Cretaceous chalk\r\nwere secondary objectives. \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 25/6-1 was spudded with the\r\nsemi-submersible installation Pentagone 84 on 26 January 1978 after spending 10\r\ndays on the location waiting on weather. No significant problems were\r\nencountered during the drilling to TD at 2895 m in Late Cretaceous limestone.\r\nThe well was drilled with spud mud to 192 m, with CMC/Bentonite from 192 m to\r\n468 m, and with Lignosulfonate/Dextrid mud from 468 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe first interval of interest was the\r\nEocene Frigg Formation from 2107 m to 2150. This interval turned out to be\r\nshaly with thin sand layers up to 3 meter thick only. Some oil shows were\r\nrecorded in the sands. In the lower part of the Frigg Formation a core was\r\ntaken with four thin interbeds of sandstones medium to fine grained and weakly\r\ncemented. These sandstones were fluorescent (light yellow) and gave a\r\nfluorescent, light yellow extract. Massive Heimdal Formation sand was\r\nencountered from 2249 m to 2563 m. The unit has good reservoir characteristics\r\nwith translucent fine to coarse, subrounded to subangular, mostly well-sorted\r\nsand. The porosity of the sandy levels varies from 20 to 25% and net sand\r\nthickness is about 226 m. The unit was water bearing. No shows were encountered\r\nduring the drilling or on the lab. The lower part (2675 m to 2799 m) of the\r\nDanian sequence (Ty Formation) was composed of many intercalations of sandy\r\nlevels and shaly beds. The sandy intervals had poor porosit",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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