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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 247,
    "wlbName" : "1/9-4",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 1/9-4 was drilled on a salt diapir\r\nstructure in the Central Graben in the neighbourhood of the Norwegian - UK\r\nmedian line. The primary purpose was to test the Ekofisk and Tor formations of\r\nDanian and Maastrichtian age. Lower possible porous zones in chalk and Jurassic\r\nsands, if present, were 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\u003eWildcat well 1/9-4 was spudded with the\r\nsemi-submersible installation Ross Rig on 13 August 1977 and drilled to TD at 3710\r\nm in Late Permian Zechstein salt. There were no serious drilling problems down\r\nto a depth of 3100 m. At 3100 m the bit-junksub assembly was lost in the hole. The\r\nhole was cemented back and sidetracked after the fishing attempts proved\r\nunsuccessful. After one unsuccessful sidetrack attempt the hole was sidetracked\r\nagain from 3041 m and drilled on to core point at 3122 m. When cutting core no 10\r\nthe bottom hole assembly got stuck and a long section of the BHA had to be left\r\nin the hole. After some unsuccessful attempts on jarring, the hole was cemented\r\nand sidetracked again, from 3059 m in the first sidetrack hole. This second sidetracked\r\nhole was drilled to a measured depth of 3353 m. At this point 7" liner was\r\nrun. 6" hole was drilled to a total measured depth of 3710 m with only\r\nminor problems and top of the salt was found at 3650 m. The 6" hole was\r\nlogged and plugged back. It was found necessary to perform a squeeze job around\r\nthe 7" liner shoe, but when attempting to pull out after this operation,\r\nthe BHA stuck just above the cementing stinger. Jarring did not free the pipe,\r\nand a cement plug was set above the fish. The well was drilled with high\r\nviscosity spud mud of pre-hydrated bentonite, lime, and caustic soda down to\r\n437 m and with Drispac/lime mud from 437 m to 2580 m. From 2580 m the lime was\r\nphased out and the remaining well to TD was drilled with a\r\nlignite/lignosulphonate gel mud. During abandonment an anchor chain broke in\r\nsevere weather. Th",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}