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    "wlbNpdidWellbore" : 1453,
    "wlbName" : "31/2-16 S",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-16 S was drilled as an\r\nappraisal in the Troll-West Oil province in the Northern North Sea. It was\r\nlocated on the crestal part of the Oil Province close to well 31/2-5. The\r\nprimary objective was to drill hole and prepare for a long term production from\r\na horizontal well drilled 5 m above the oil/water contact in the 23.5 m thick\r\noil column. The length of the horizontal section should preferably be 500 m. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well 31/2-16 S was spudded with\r\nthe semi-submersible installation Deepsea Bergen on 27 September 1989 and\r\ndrilled to TD at 2390 m ( 1587 m TVD RKB) in the Late Jurassic Sognefjord\r\nFormation. The well was drilled vertical down to 1118 m in the 17 1/2"\r\nsection and kicked of from there, building angle up to a horizontal well path\r\nfrom ca 1950 m. Problems with tight hole, lost circulation and hard formation\r\n(stringers) were encountered repeatedly in the 17 1/2 and 12 1/4" sections\r\nfrom 1015 to 1891 m. The well was drilled with sea water and hi-vis pills down\r\nto 1015 m and with Versaport oil based mud from 1015 m to 1891 m, and with a\r\nsuper-saturated NaCl / polymer mud from 1891 m to TD. During well completion and\r\npreparation for production testing the screen-packer stuck at 570 m. Close to\r\neight days were lost in milling and retrieving the fish before normal\r\noperations could be resumed. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe Sognefjord Formation was encountered\r\nat 1659 m (1533 m TVD RKB). The established gas/oil contact in the Troll Field\r\nis at 1547 m MSL TVD, which is 1.5 m deeper than observed in this well. This\r\n1.5 m is within the uncertainty of the TVD calculations, and a common gas/oil\r\ncontact is assumed.\u003c/p\u003e\r\n\r\n\u003cp\u003eNo conventional or side wall cores were\r\ncut. No wire line pressure tests or fluid samples were taken. Apart from runs\r\n1A, wire line logging was performed by the use of pipe conveyed Logging\r\nSystems. MWD was the only deep resistivity measuring device through the whole\r\nwell.\u003c/p\u003e\r\n\r\n\u003cp\u003eAfter d",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}