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    "wlbNpdidWellbore" : 1036,
    "wlbName" : "25/2-11",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/2-11 was the\r\nsecond well to be drilled on the East Frigg Gamma structure in the Viking\r\nGraben. Seismic anomalies indicated shallow gas in the area. The well was\r\nprimarily designed to test the reservoir productivity of the Frigg Formation.\r\nSecondly to test for possible gas accumulation in Late Oligocene sands which\r\nmight represent a continuation of the gas-bearing sands encountered in the\r\n25/2-10 well, which due to technical problems had to be abandoned without\r\nlogging and testing. TD was prognosed to be 2075 m, the Frigg Formation at 1930\r\nm and the Oligocene sands at 1005 m.\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 25/2-11\r\nwas spudded 20 February 1987 by Golar-Nor offshore semi-submersible rig\r\nNordtrym and drilled to TD at 2075 m in rocks of Eocene age.\r\nDue to the seismic anomalies that indicated shallow gas, the well was spudded\r\n100 m north of the original location. \u003c/p\u003e\r\n\r\n\u003cp\u003eHard calcite\r\ncemented sands were encountered in Miocene where unconsolidated sands were\r\nprognosed. This caused 17 extra days of drilling, under-reaming and\r\nsidetracking. Top Oligocene was penetrated 20 m below prognosed depth, and top\r\nFrigg formation came 20 m below prognosis. Both targets proved to be\r\nhydrocarbon bearing. The main hydrocarbon-bearing reservoir encountered in\r\nOligocene was a sand-lense at 1105.5 - 1111.5 m (1079.8 - 1085.8 MSL).\r\nPost-well gas chromatographic analyses of core chip extracts from Oligocene\r\n(1051 m and 1107 m) showed extensively biodegraded oil. The Frigg Formation\r\noil/water contact was encountered at 1975 m, and gas/oil contact at 1960 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eCoring commenced\r\nfrom 1950 m to 1986 m with 50% recovery. Three runs to sample the oil from the\r\nOligocene reservoir interval 1105.5 m to 1111.5 m were made by RFT through\r\ncasing. No hydrocarbons were recovered. A RFT sample from 1967 m in the Frigg\r\nFormation recovered mud filtrate with traces of oil.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was plugged\r\nand abandoned on 10 may 1987 as a gas and oil appr",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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