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    "wlbName" : "31/2-3",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-3 was drilled in the Troll West\r\narea, approximately 8 km NNE of the Troll Discovery well 31/2-1. The well was\r\ndrilled to appraise the Troll Discovery. It should evaluate reservoir\r\nparameters along the axis of maximum gross hydrocarbon column; prove maximum\r\nhydrocarbon reserves in the major northern fault block; confirm the\r\nsignificance of the seismic flatspot as a direct hydrocarbon indicator; further\r\nassess the significance of the oil shows found in 31/2-1; and evaluate the\r\ninfluence of earlier Kimmerian fault movements on reservoir characteristics.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 31/2-3 was spudded with\r\nthe semi-submersible installation Borgny Dolphin on 28 March and drilled to TD\r\nat 2601 m in Late Triassic sediments in the Statfjord Formation. Drilling took\r\n115 days. The reason for the long drilling period was safety inspection of the\r\nrig as a result of the "Alexander Kielland" accident and a strike\r\namongst the Norwegian rig crew. The well was drilled with bentonite and\r\nseawater down to 816 m and with a gypsum/lignosulphonate mud from 816 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eNo potential reservoir zones were\r\nencountered above top Jurassic. The well confirmed that the Late Jurassic\r\nsandstone reservoir encountered in wells 31/2-1 and 2 was well developed also\r\nin this more northerly part of the structure. A gross gas column of 189 m was\r\npenetrated with top at 1384 m. The uppermost 120 m was in a good clean sand\r\n(Sognefjord Formation) while the lower part of the gas column was in a\r\nmicaceous and poor reservoir sand (Heather and Fensfjord Formations). Below the\r\ngas a 12 m thick oil zone was encountered, the same thickness and at the same\r\nlevel as in well 31/2-2. In this well however, the oil was in a very micaceous\r\nand poorly developed reservoir. The reservoir was uncomformably overlain by\r\nPalaeocene claystones, which thus act as an effective seal for the reservoir.\r\nBelow the OWC at 1585 no moveable hydrocarbons were seen in th",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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