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    "wlbNpdidWellbore" : 447,
    "wlbName" : "31/3-3",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe wildcat well 31/3-3 was drilled on a\r\nstructure east of the Troll Field. The structure, which is deeper than the\r\noil/water contact proved in the Troll Field area, is defined on the Top\r\nSognefjord Formation and situated on a rotated fault block compartment dipping\r\ngently to the east. The main objective of the well was to test the Late\r\nJurassic sandstones, which were gas and oil bearing in the Troll Field. A\r\npossible stratigraphic trap in the Early Cretaceous sequence and small closures\r\nof the Brent Group and Statfjord Formation were secondary targets. \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 31/3-3 was spudded with the\r\nsemi-submersible installation Treasure Saga on 13 October 1984 and drilled to\r\nTD at 2573 m in the Early Jurassic Statfjord Formation. No major problems\r\noccurred due to drilling. The well was drilled using spud mud down to 406 m,\r\nwith KCl/polymer from 406 m to 1630 m, with CaCO3 mud from 1630 m to 2112 m,\r\nand with gel/lignosulphonate from 2112 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eNo reservoir rock was encountered in the\r\nEarly Cretaceous. In the Jurassic a 152 m thick sequence of Sognefjord\r\nFormation consisting of several stacked coarsening upward sand sequences was\r\npenetrated. The Statfjord Formation consisted of alternating sandstones and\r\nclaystones with traces of limestone, mica and coal fragments. The only trace of\r\nhydrocarbons in the well were two very weak shows, possibly dope contamination,\r\nin cores no 3 and 5 in the Sognefjord Formation. Seven conventional cores were\r\ncut, one in the lower part of the Cromer Knoll Group and the last six in the\r\nLate Jurassic Sognefjord and Heather Formations. Totally 168.5 m were cut with\r\na recovery of 166.5 m (99%). No fluid samples were taken.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 18\r\nNovember 1984 as a dry well.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo drill stem test was performed\u003c/p\u003e\r\n\r\n\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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