{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1762,
    "wlbName" : "15/5-4",
    "wlbHistory" : "\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eGeneral\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 15/5 4 was drilled on a structure\r\nthat straddles the border between the U.K. and the Norwegian sector of the\r\nNorth Sea. Hydrocarbons were proven in the structure by three earlier wells\r\ndrilled in the UK sector (U.K. 16/13a-3, 16/13a-4, and 16/13a-5). Well 16/13a-4\r\npenetrated a gas cap at the top of the structure and an oil column down to base\r\nreservoir. The other two wells penetrated an oil zone and a water leg. The\r\nobjective of well 15/5-4 was to assess the extension of hydrocarbon bearing\r\nSele Formation sand towards the east into PL048. The well position was chosen for\r\npossible use as a producer in the event of a positive appraisal. Prognosed\r\ntotal depth was 2300 m. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eOperations and results\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eAppraisal well 15/5-4 was spudded by the\r\nsemi submersible installation Vildkat Explorer on 6 June 1991 and drilled to TD\r\nat 2300 m in rocks of the Paleocene Heimdal Formation. No shallow gas was\r\nobserved on the predicted sand/gas levels. Drilling proceeded without any\r\nsignificant problems. The well was drilled with spud mud down to 1027 m and\r\nwith KCl/polymer mud from 1027 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThin sands of the Sele Formation were\r\nencountered at 2120 m and had good oil shows. The reservoir thickness was\r\ncalculated to 7.5 m. The sandstones of the Heimdal Formation were penetrated\r\nbelow the oil/water contact and were totally water wet. Weak oil shows was\r\ndescribed on sidewall cores from claystone at 1909 m in the Frigg Formation and\r\nsandstone at 2182 m in the Lista Formation.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eA total of six cores were cut from 2106 m\r\nto 2147 m over the reservoir section. RFT fluid samples were attempted at 2125.1\r\nm, 2125.3 m, 2125.8 m, and 2129.5 m. Sampling suffered from sand plugging and\r\nonly the samples from ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}