{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 500,
    "wlbName" : "31/2-5 R",
    "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. It was drilled in 1980 and\r\nfound a 21 m thick oil zone in excellent reservoir sandstone. The oil column in\r\nthis location was found to be significantly thicker than in other wells in the\r\narea. The objective of the re-entry was to perform a production test in the oil\r\nzone. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 31/2-5 was re-entered\r\n(31/2-5 R) with the semi-submersible installation Borgny Dolphin on 12 June\r\n1981. The cement suspension plug (1204 -1465 m) was drilled out and a test was\r\ncarried out.\u003c/p\u003e\r\n\r\n\u003cp\u003eAfter testing a cement plug was set from\r\n1261 m to 1450 m and again suspended on 20 July 1981.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eOne drill stem test was carried out. The\r\noil zone was perforated from 1582 m to 1588 m and acidized to reduce impairment\r\nof the formation caused by completion fluids. The interval was then tested\r\nthrough gravel pack and produced 906 Sm3 (5700 bbl) oil /day on a 64/64"\r\nchoke. The GOR was 53 Sm3/Sm3 and the oil gravity was 29 deg API. Opening up the\r\nchoke to 2 x 64/64" the rate increased to 1177 Sm3 (7400 bbl)/day and the\r\nGOR increased to 243 Sm3/Sm3. Gas chromatographic analyses of the crude showed\r\na bacterially degraded oil where the n-alkanes were almost absent.\u003c/p\u003e\r\n\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}