{
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "839",
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    "wlbNpdidWellbore" : 2068,
    "wlbName" : "34/7-21 A",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 34/7-21 A is a sidetrack\r\nto well 34/7-21 which found oil in three different sands in the Late Jurassic -\r\nEarly Cretaceous succession. No OWC was found. The primary purpose of the\r\nsidetrack was to test the extension of these discoveries and to prove possible\r\nOWC(s). A secondary objective was to test the presence of sandstones, and\r\npossible hydrocarbons, within the Late Cretaceous in which a thin sandstone\r\ninterval was proved oil-bearing in well 34/7-21.\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 34/7-21A was kicked off from 1798 m\r\nin the vertical well on 16 December 1992. The well was deviated and penetrated\r\nthe top reservoir 585 m west of the vertical well. It was drilled with the semi-submersible\r\ninstallation Treasure Saga to TD at 3360 m (2874 m TVD), 37 metres TVD into the\r\nBrent Group. Initial problems with steering the drill string resulted in a kick-off\r\nin the wrong direction. The well was turned around and lined up to the correct\r\nazimuth. The drill string got mechanically stuck three times in the interval\r\n2465 m to 2571 m, but came free within short time. The string also got stuck at\r\n2998 m when running in the hole after waiting on weather. The hole apparently\r\ndeteriorated with time. The TD caliper log showed severe washouts of the hole,\r\nup to a maximum of 22". Waiting on weather for about 17 days was seen to\r\nbe a major cause of the severe washouts. The washouts and hence increased\r\namounts of cuttings, possibly explain the problems with the hole packing off\r\nand the string becoming stuck. Due to the hole angle and the bad hole condition\r\nlogging operations were troublesome and time consuming, with many of the logs\r\nbeing run on drill pipe. The sidetrack was drilled with a KCl mud all through.\r\nThe KCl levels were high and in addition glycol was introduced to inhibit the\r\nformation, but without the wanted effect as proved by the severe washout. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe Base Cretaceous Unconformity was penetrated\r\nat 2870 m. A 3 m thick san",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}