{
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    "wlbName" : "31/2-12",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-12 was drilled as an appraisal well in the Troll\r\nWest oil province in the Northern North Sea. The main\r\nobjectives were to evaluate various techniques for gas production wells in the\r\nTroll field, to establish the reservoir quality in the central part of the\r\nTroll field gas accumulation, and to provide additional data point for the\r\ncorrelation and mapping of the depositional units.\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 31/2-12 was\r\nspudded with the semi-submersible installation Borgny Dolphin on 26 May 1983 and drilled to TD at 1615 m in the Middle Jurassic Fensfjord Formation. On 4\r\nJune, after running the BOP-stack, operations were interrupted by a labour\r\ndispute. After the strike ended on 17 June problems with the BOP lead to a further\r\n4 days delay before normal drilling operations were resumed. Some instability\r\nproblems and well kicks were encountered while drilling and testing in the\r\nreservoir. The well was drilled with Seawater and gel down to 807 m, with\r\nKCl/polymer mud from 807 m to 1338 m, and with CaCl2/CaCO3/polymer mud from\r\n1338 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop reservoir in well 31/2-12 was\r\nencountered at 1365 m. The formations were interpreted to be gas bearing all\r\nthrough the Sognefjord Formation, the Heather Formation (1487 - 1541 m), and down\r\nto a clear GOC at 1570.5 m in the Fensfjord Formation. The upper part of the Sognefjord\r\nFormation consisted of generally clean sandstones. Below 1455 m the sands were\r\nmicaceous and silty. Tight calcareous streaks occurred over the whole section.\r\nOil was interpreted from 1570.5 m down to 1581.0 m, where an abrupt drop in\r\nresistivity was interpreted as the oil/water contact. The contact was somewhat\r\nobscured however by a change in lithology from clean, but rather tight,\r\nsandstone to micaceous sandstone. No movable oil was calculated below this\r\ndepth, but shows (fluorescence and cut) was observed on sidewall cores down to\r\n1608 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eTen cores were cut in the Late Jurassic Sognefjord\r\nreservo",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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