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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 13,
    "wlbName" : "7117/9-2",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 7117/9-2 is located on\r\nthe Senja Ridge west of the Tromsø Basin. The primary objective of wildcat\r\n7117/9-2 was to test sandstone or limestone reservoirs of Early Cretaceous age\r\nin a well-defined offset bounded structure within the Senja Ridge (the Lom\r\nstructure). An alternative model suggested that the primary objective was\r\nsandstones of Middle Jurassic age and the secondary objectives were sandstone\r\nreservoirs of Triassic age or older. The well was planned to be drilled to a\r\ntotal depth of 5000 m and serve as the deep commitment well on the block.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003e7117/9-2 was spudded with the\r\nsemi-submersible installation Treasure Scout on 7 May 1983 and drilled to a\r\ntotal depth of 5000 m in Early Cretaceous (?Aptian) clay stone. Nineteen rig\r\ndays were lost due to strike, otherwise no major problems occurred during\r\ndrilling of this well. The well was drilled with seawater and hi-vis pills down\r\nto 358 m. with seawater and bentonite from 358 m to 915 m, and with gypsum /\r\npolymer from 915 m to 2500 m. From 2500 m the mud was dispersed to a\r\nlignosulphonate mud, which was used for the remaining well down to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003ePleistocene deposits were encountered\r\ndown to 400 m and underlain by a thick sequence of Pliocene clays down to 1092\r\nm. Paleocene rocks continued down to 1345 m followed by a thin sequence of\r\nCampanian (1380 m to1396 m) and Late Albian to Early Cenomanian (1400? - 1410)\r\ndeposits. The lowermost strata penetrated by the well consisted of a thick,\r\npoorly defined sequence of claystones. The upper sequence from 1625 m to 3440 m\r\nis of Albian to Aptian age. In the lower section, few identifiable fossils were\r\nrecorded and preservation was poor. The Lom structure was penetrated in a down\r\nflank position at approximately 3375 m. The structure proved to consist of\r\nEarly Cretaceous silty claystones of probable Aptian age and bounded by\r\nfractured dolomites. No rocks with reservoir properties were encountered in",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}