{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 90,
    "wlbName" : "31/2-10",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-10 was drilled as an appraisal\r\nwell in the Troll West oil province in the Northern North Sea. The main\r\nobjectives were to define the top and intra reservoir markers in this area of\r\nthe Troll West, establish the extent of the 27.5 m oil column in the area in\r\nwhich the GOC is at 1541 m sub-sea (1567 m RKB), and to determine the reserves\r\npotential in the structurally low area east-north of well 31/2-5 and south east\r\nof 31/2-7. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe site survey revealed, typical for the\r\narea, numerous pockmarks. These had a fairly random distribution of 15 to 20\r\nper km2. Although the size of individual pockmarks varied, average sizes were\r\nbetween 30 and 40 m wide at the rim, and 3 to 4 m deep at the centre. At the\r\nlocation itself no pockmark was seen. \u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-10 was spudded with the semi-submersible\r\ninstallation Borgny Dolphin on 2 October 1982 and drilled to TD at 1833 m, 40 m\r\ninto in the Early Jurassic Fensfjord Formation. After drilling the 36"\r\nsection, a 14 3/4" pilot hole was drilled to 810 m. The hole was then\r\nlogged without indication of shallow gas before opening up to 26". One and\r\na half days were lost during coring due to bad weather. The well was drilled\r\nwith spud mud down to 472 m, with gel/seawater from 472 m to 810 m, with KCl/polymer\r\nmud from 810 m to 1530 m, and with seawater/Drispac from 130 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop Jurassic was encountered with a 35 m\r\nthick Draupne shale. The Sognefjord Formation sands were encountered at 1600 m,\r\nbelow the prognosed OWC. The Heather Formation came in at 1733 m, and the\r\nFensfjord Formation at 1793 m. From top Sognefjord Formation to 1647 m bleeding\r\noil and oil stained grains were noted on the cores. However the petrophysical\r\ninterpretation concluded the sands to be water bearing. \u003c/p\u003e\r\n\r\n\u003cp\u003eTen cores were taken in the interval 1575\r\nm to 1741.5 m and 127.98 m (77%) was recovered. All cores were taken in\r\nfibreglass sleeves to achieve better recovery ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}