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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 2661,
    "wlbName" : "25/5-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eExploration well 25/5-5 is located a few\r\nkm east-southeast of the Heimdal field. The objective was the turbiditic sands\r\nof the Heimdal Formation, which is the reservoir for the Heimdal gas field. The\r\nJotun oil discovery (8 km south) and a minor oil discovery on 25/4-2 (5 km\r\nnorth-northwest) are also in Heimdal turbiditic sands. The prognosed TD of the\r\nwell was 2600 m in the Ty / Våle Formations in case of a discovery, or 2250 m\r\nin the Heimdal Formation, in case of a dry well. The chosen location was on the\r\nhighest structural point of the 25/5-5 closure. Oil with a possible gas cap was\r\nthe anticipated reservoir fluid\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 25/5-5 was spudded with the\r\nsemi-submersible installation Vildkat Explorer on 27 October 1995 and drilled\r\nto TD at 2600 m in the Paleocene Våle Formation. No significant operational\r\nproblems were encountered in this well and TD was reached in less than 9 days\r\nafter spud. The well was drilled with seawater and hi-vis pills down to 1206 m\r\nand with Safemul oil based mud from 1206 m to TD. Due to the choice of OBM\r\nsystem, the 8 1/2" diameter was drilled in preference to 12 1/4" to\r\nminimize mud and cuttings volumes. \u003c/p\u003e\r\n\r\n\u003cp\u003eTop Heimdal Formation was found at 2158.5\r\nm, 13 m above prognosis. The formation was 334 m thick. The reservoir was\r\noil-bearing, with an OWC at 2176.3 m. There was no recognised gas cap. As\r\nprognosed, the reservoir properties were very good. Two cores were cut from\r\n2162.5 m to 2199.75 m in sandstone of the Heimdal Formation. The cored interval\r\nwas hydrocarbon bearing, with the OWC clearly defined on the lower core. The\r\nMDT tool was run to obtain pressure and fluid samples from the reservoir.\r\nPressure depletion from production of the Heimdal Field was confirmed. From the\r\npressure plot some vertical barrier effects were evident in the deeper part of\r\nthe aquifer zone, below 2206 m. In the upper part of the Heimdal Sand, however,\r\nno pressure barriers c",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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