{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 6,
    "wlbName" : "31/2-11",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-11 was drilled as an appraisal\r\nwell in the Troll West oil province in the Northern North Sea. The main\r\nobjectives were to appraise the reservoir quality and the extension of the 28-m\r\noil column in the southern part of the 31/2-7 accumulation in the Viking Group\r\nreservoir sequence. The well would assist in the mapping of the permeability\r\ndistribution in the oil province, provide an additional data point for the\r\ncorrelation and mapping of the depositional units, and obtain additional oil\r\nproduction test data for input to the field development. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-11 was spudded with the semi-submersible\r\ninstallation Borgny Dolphin on 17 March 1983 and drilled to TD at 1744 m in the\r\nMiddle Jurassic Fensfjord Formation. No major problems occurred during\r\ndrilling. The well was drilled with Seawater and gel down to 810 m, with\r\nKCl/polymer mud from 810 m to 1535 m, and with CaCl2/CaCO3/polymer mud from\r\n1535 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop Jurassic, Sognefjord Formation, was\r\nencountered at 1558 m. The reservoir sands were found to be hydrocarbon bearing\r\nwith GOC at 1566 m (1541 m sub-sea) and OWC (50% saturation) at 1593 m (1567 m sub-sea),\r\nin-line with the regional contacts in this area of the Troll West Oil Province.\r\nBelow OWC residual oil was interpreted down to some 1640 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eA total of eight cores were cut. To\r\nenable investigation of the shallow sediments, 2 cores were cut in the interval\r\n380 m to 399 m and one from 475 to 476 m. Five cores were cut in the Late\r\nJurassic reservoir sands from 1555 to 1629 m using fibre glass sleeve\r\ntechniques to achieve better recovery in the poorly consolidated sands. Attempts\r\nto obtain RFT fluid samples were unsuccessful due to plugging of the tool with\r\nchalk particles from the mud.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 25 May 1983 as an oil and gas appraisal.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eTwo DST's were performed, one in the\r\nwater zone and one in the oil zone. DST 1",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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