{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 220,
    "wlbName" : "3/7-2",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 3/7-2 was drilled on a structure\r\nlocated across blocks 3/4 (Amoco Group) and 3/7 (Petronord Group. The primary\r\ntargets were: Tertiary sands found gas bearing in well 2/3-1; Danian/Late\r\nCretaceous limestone (chalk) hydrocarbon bearing in the Ekofisk area and in the\r\nDanish well Lulu 1; Middle Jurassic sandstones which were hydrocarbon bearing\r\nin well 2/6-2; and Rotliegendes sandstones. The TD was planned into the\r\nCarboniferous in order to establish the source potential of this formation.\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 3/7-2 was spudded with the\r\nsemi-submersible installation Dyvi Alpha on 30 March and drilled to TD at 4330\r\nm in the Early Permian Rotliegendes Group. A drilling break occurred at 2534 m.\r\nFlow check at 2553 m showed a weak flow, which was controlled by raising the\r\nmud weight to 1.46 sg. Drilling resumed and was stopped at 2563 m for logging.\r\nThree days were necessary to run the electric logs because of continuous slight\r\nflow. Deviation problems were experienced in the salt. The deviation reached a\r\nmaximum of 9 1/2 deg at 3659 m then was reduced to 2 1/2 deg at 4004 m. The\r\nwell was drilled with a lignosulphonate mud from 2563 m to 3027 m. Below the 9\r\n5/8" casing shoe at 3012 m the mud was displaced to a salt saturated mud.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Eocene/Oligocene sands were found\r\nmissing. Only 8 meters of sand were encountered in the Paleocene. The chalk was\r\ntight and water bearing. The Jurassic sandstones were not as developed as\r\nprognosed, and they were water bearing. No sandstones were encountered in the\r\nRotliegendes Group, which consisted of an upper shale and a lower volcanic\r\nunit. Carboniferous sediments were not penetrated. All the targets above the\r\nsalt were found water bearing while no reservoir was encountered below 4166 m (base\r\nsalt, F horizon). Prognosed stratigraphy at base Cretaceous and below was in\r\nerror. Base Cretaceous was encountered 115 m higher than prognosed, top salt\r\nwas 209 m higher than prognosed,",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}