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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 191,
    "wlbName" : "7/9-1",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 7/9-1 is located on the Reke Fault\r\nZone between the Jæren High and the Sørvestlandet High. The objective of the\r\nwell was to test for hydrocarbons in Tertiary, Cretaceous, Jurassic, and\r\nTriassic reservoirs over a Zechstein salt well which showed 1300 feet of\r\nvertical closure over an area of about 65 square km at the base Tertiary level.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Reference Well for the Gassum\r\nand Fjerritslev formations.\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 7/9-1 was spudded with the\r\njack-up installation Mærsk Explorer on 22 April 1970 and drilled to TD at 2931\r\nm in Zechstein salt. The well was spudded using a high viscosity gel-seawater\r\nmud. After drilling out of the 20" casing, which stuck at 242 m, the mud\r\nwas converted to a lignosulphonate-seawater. The 213 m of 26" rat hole\r\nleft below the 20" casing gave considerable trouble by acting as a build\r\nup area for large balls of gumbo, which collected there as 17 1/2" hole\r\nwas being made. An attempt to run electric logs at the 13 3/8" casing\r\npoint failed because of the fill at 442 m. Drilling detergent was used to\r\nreduce torque and drag and was successful in the upper part of the hole. The\r\ndiesel oil content of the mud was maintained between 4% and 7%. A deviation\r\nproblem arose in the 8 1/2" hole, starting around 2255 m where the angle\r\nwas 4.5°. It increased steadily and at 2723 m the last survey point was 5.5°.\r\nLight bit weight, high rotary speeds, and a bottom hole assembly usually\r\nsuccessful in dropping angle had no effect.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Tertiary Paleocene Sands were not\r\ndeveloped over the structure. The other objectives, the Tertiary Danian\r\ncalceranites, the late Cretaceous Maastrichtian chalk, and the Middle Jurassic\r\nto Triassic sandstones, were confirmed, but were water bearing. During the\r\ndrilling of the Tertiary section to a depth of 1676 m shale gas from the\r\nsometimes richly organic shales maintained a high background between 0.5% and\r\n1% methane in ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}