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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 25,
    "wlbName" : "2/5-7",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 2/5-7 is located ca 9 km\r\nNorth of the Tor Field in the southern Norwegian North Sea. The primary\r\nobjective was to test Late Jurassic and Middle Jurassic/Triassic sandstones on\r\ntop of a gentle salt-induced dome structure. Secondary objectives were Late\r\nCretaceous chalk and Paleocene sandstones. \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 was spudded with the jack-up\r\ninstallation Neddrill Trigon on 11 August 1983 and drilled to TD at 4531 m in\r\nthe Triassic Skagerrak Formation. During drilling of the 17 1/2" hole\r\nseveral tight spots and problems with cavings were experienced. While tripping\r\nout of the hole at 3956 m, the drill string parted and 193 m of the bottom hole\r\nassembly was left in the hole. The fish was recovered after some problems due\r\nto tight hole conditions. When pressure testing the 9 5/8" casing the\r\nfloat collar sheared out causing the casing to jump. After re-landing, the\r\ncasing was found to have dropped a couple of inches. Repair of the casing took\r\n35 days extra rig time. A drilling break occurred at 4161 m where a 1.5 m thick\r\nmarl was encountered. Maximum gas reading at bottoms-up was 30 %, and slight\r\noil shows were observed in the mud. A kick was taken at 4519 m with an influx\r\nof 2.5 m3 water. The well was drilled with seawater and gel down to 862 m, with\r\nKCl/polymer mud from 862 m to 2254 m, with lignosulphonate mud from 2254 m to\r\n3529 m, and with gel/lignosulphonate mud from 3529 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eOnly traces of sandstone were encountered\r\nin the Late Paleocene, and there were no indications of hydrocarbons. Porous\r\nchalk was encountered in the Ekofisk Formation at 3204 m and in the Tor\r\nFormation at 3289 m. Both formations tested oil, but the oil flow in the\r\nEkofisk test was interpreted to originate from the Tor Formation (see below).\r\nThe matrix permeability in these zones is low, but the results from the\r\nproduction tests indicated that fracture permeability is significant. No\r\nhydrocarbons were found in the L",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}