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    "wlbName" : "31/2-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 31/2-5 is located in the\r\nsouthern part of the oil province in the Troll West area, some 6 km west of the\r\ndiscovery well 31/2-1, in a downthrown fault block. The objectives of the well\r\nwere to test presence and nature of hydrocarbons in a structure west of the\r\nmain gas reservoir; to test lateral variation in reservoir characteristics\r\nwestwards; to investigate possible causes for the difference in flat spot\r\nappearance in this fault block; and to get a good geologic identification of\r\nthe various seismic reflectors for lateral extrapolation of well data. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eProblems were experienced during\r\npositioning and anchoring of semi-submersible installation West Venture for the\r\nwildcat well 31/2-5. After 6 days efforts the installation had to be\r\nrepositioned 25 m from the intended location and the anchors were successfully\r\nlaid out and tensioned. The well was spudded on 26 October 1980 and drilled to\r\nTD at 2532 m in the Triassic Hegre Group. The well was drilled with seawater\r\nand viscous pills down to 443 m, with gelled seawater from 443 m to 810 m, with\r\nKCl/polymer mud from 810 m to 1807 m, and with seawater/gel from 1807 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-5 confirmed that the Late\r\nJurassic Sognefjord Formation sandstone reservoir was well developed also in\r\nthe western part of the structure. A gas column was penetrated from 1536 m to\r\n1579 m (43 m), followed by a 21 m thick oil column down to an OWC at 1600 m.\r\nGood oil shows continued down to 1644.5 m. The GOC was found at the same depth\r\nas seen in the other wells in the area. The most interesting observation in\r\nthis well was the presence of the thick oil column below the gas, some 9 m\r\nthicker than seen in any of the other wells, and the oil was encountered in a\r\nsection of the reservoir with very good clean sand. It is yet too early to\r\nexplain the difference in oil thickness, and the importance of a thicker oil\r\ncolumn in a good sand will remain unknown until a full produc",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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