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  "LayerName" : "Wellbore - History",
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    "wlbName" : "7117/9-1",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe wildcat 7117/9-1 was the first well\r\nto be drilled in the western part of the Troms I area. It is located on the\r\nwestern margin of the Tromsø Basin close to the Senja High. The primary\r\nobjectives of the well were to test two possible sandstone reservoirs of\r\nassumed Late Cretaceous age. Flat spots indicating fluid contacts were noted in\r\neach of these two target horizons. A secondary objective was to test sandstones\r\nof assumed Middle to Early Jurassic age. Planned TD was 2500 m in sediments of\r\nTriassic age.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe location survey showed the area to be\r\ncovered with iceberg scars with depths from l m to 10 m. The dominant direction\r\nof these scars is ENE-WSW and most of them are filled with sand and silt. The\r\nquaternary sediments were about 280 m thick and layered in three main zones.\r\nThere were no indications of shallow gas in the area.\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 7117/9-1 was spudded\r\nwith the semi-submersible installation Treasure Scout on 20 April 1982. Due to\r\nexcessive hole deviation while drilling to 303 m the rig had to be moved to\r\nrespud the well on 24 April. In this attempt high torque in extremely hard top\r\nlayers caused the drill string to twist off at 299 m. The third hole was\r\nspudded on 30 April. The drilling progressed without further problems. The last\r\nsection was drilled with 8 3/8" bit and the well reached TD at 3200 m in\r\nEarly Cretaceous (Middle Albian to ?Aptian) clay stone. The well was drilled\r\nwith seawater and hi-vis pills down to 348 m, with seawater/bentonite from 348\r\nm to 817 m, and with gypsum / lignosulphonate from 817 m to 1220 m. From 1220 m\r\nthe mud was changed to a gel lignosulphonate system as the reactive clays\r\ndisappeared and the rest of the well was drilled with this mud system.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe more shallow of the two Late\r\nCretaceous target reservoirs was found to be a low velocity clay stone interval\r\nof Paleocene age, between 1277 m and 1328.5 m. The flat spot (at 1.4 sec TWT)\r\ncou",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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