{
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  "LayerName" : "Wellbore - History",
  "id" : "689",
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    "OBJECTID" : 689,
    "wlbNpdidWellbore" : 1508,
    "wlbName" : "1/6-5",
    "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 1/6-5 is located in the Feda Graben\r\nbetween the Flyndre and Tommeliten Gamma discovery in the North Sea. The well\r\nwas drilled on the crest of a major salt diapir. The objective of the well was\r\nto test the existence of a chalk raft and the presence of reservoired\r\nhydrocarbons.\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\u003eWildcat well 1/6-5 was spudded with the\r\nsemi-submersible installation Dyvi Stena on 20 July 1990 and drilled to TD at 1854\r\nin Late Permian salt of the Zechstein Group. An 8 1/2" pilot hole was\r\ndrilled from 156m to 600m. The hole was control drilled at 30m/hr maximum ROP\r\nas a precaution for encountering shallow gas. No shallow gas was encountered. Pore\r\npressure prediction while drilling in the 1/6-5 well was difficult as the only\r\npore pressure detection parameters that appeared to work were gas measurements,\r\nresistivity and sonic log measurements. Other parameters such as shale cuttings\r\ndensity, Electric log density, D-exponent and rate of penetration were not\r\nsuccessful in determining high pore pressure zones. However, despite the\r\nabnormally high pressures and temperatures encountered drilling went forth\r\nwithout major incidents. A minor salt water flow accompanied by a 37.1 % gas\r\npeak occurred during a trip at core point at 1725 m. The mud weight was\r\nincreased from 15 ppg to 15.3 ppg and finally 15.5 ppg as a result of this flow.\r\nIn the following coring 119 bbls of mud was lost to the formation, but this was\r\ncured by setting an LCM pill. The well was drilled with seawater and viscous pre-hydrated\r\nbentonite sweeps down to 600 m and with fresh water polymer mud/Duponol WBS 200\r\nwellbore stabilizer from 600 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eFrom 864 m gas readings showed all\r\ncomponents from C1 to C4. Gas peaks from the formation were experienced all",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}