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  "LayerName" : "Wellbore - History",
  "id" : "813",
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    "wlbNpdidWellbore" : 1967,
    "wlbName" : "34/7-20",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 34/7-20 is located\r\nbetween the Snorre and the Statfjord Nord Field on Tampen Spur in the Northern North Sea. The well is positioned up-dip on a gently west-dipping structure that\r\nincludes a supposed thin Late Jurassic sand interval. The primary objective was\r\nthis Late Jurassic sand in a pinch-out trap. A secondary objective was to test the\r\nBrent Group, and if water-bearing, make a pressure test in order to evaluate\r\npossible communication to the Vigdis West Field. \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 34/7-20 was spudded with the\r\nsemi-submersible installation Treasure Saga on 18 July 1992 and drilled to TD at 3177 m in the Late Triassic Lunde Formation. The 12 1/4" section was\r\ndrilled with slow penetration rates, frequent wiper trips, and frequent change\r\nof drill bits. After a bit change, the new BHA went stuck at 2724 m while\r\nrunning in the hole, and had to be worked free with 110 tons overpull. The well\r\nwas drilled with spud mud down to 419 m, with gel mud from 419 m to 1220 m, and\r\nwith KCl mud from 1220 m to TD. Indications of shallow gas were seen at 557 -558\r\nm and at 620 - 621 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eDown to Base Cretaceous the well\r\npenetrated mainly claystones. An exception to this was the sandy Utsira\r\nFormation between 961 and 1040 m. The Jurassic interval comprised the prognosed\r\nLate Jurassic sandstone and Heather Formation, the Middle Jurassic Brent Group\r\nand the Early Jurassic Dunlin Group. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe top of the primary target Late\r\nJurassic reservoir was penetrated at 2578 m, 7 meter shallower than prognosed. Only\r\n3 meter of Late Jurassic sand was penetrated and proved water bearing with oil-shows.\r\nThese were the only shows reported in the well.\u003c/p\u003e\r\n\r\n\u003cp\u003ePressure tests in the Brent and Viking\r\nGroups in well 34/7-20 indicated communication between the sandstones of the\r\nLate Jurassic and Brent Groups. These sandstone units are probably in contact\r\nfurther up-dip, which is, most likely, the explanation to why the well",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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