{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 93,
    "wlbName" : "31/2-13 S",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 31/2-13 S was drilled as an appraisal in the Troll\r\nWest oil province in the Northern North Sea. The main\r\nobjectives of were to investigate the reservoir properties and accumulation\r\nconditions between the wells 31/2-5 and 31/2-11. Water and/or gas -coning tests\r\nwere to be conducted. \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 31/2-13 S was spudded with\r\nthe semi-submersible installation Borgny Dolphin on 2 January 1984 and drilled\r\nto TD at 2010 m in the Middle Jurassic Fensfjord Formation. Due to bad weather\r\nthe string parted and was observed lying across the temporary guide base when\r\nthe well was spudded. The fish was recovered. Straight hole was drilled down to\r\n500 m where the hole was kicked off with an angle of 1 1/2 degree. Some\r\nproblems due to tight hole occurred in the 17 1/2" hole. Mud losses to the\r\nformation occurred at 1531 and 1700 m, 100 bbls at each depth. A drill break\r\noccurred at 1744 m in the 12 1/4" hole section. The well was drilled with\r\nseawater and viscous pills down to 473 m, with Gelled mud from 473 m from 473 m\r\nto 750 m, with seawater from 750 m to 825 m, and with oil based mud from 825 m\r\nto TD. The Oil based mud used was termed "Fazekleen, low toxicity invert\r\noil emulsion mud, based on Shell Sol D70 oil"\u003c/p\u003e\r\n\r\n\u003cp\u003eTop reservoir (top Sognefjord Formation) was\r\npenetrated at 1732 m (1526.5 m TVD), top Heather Formation at 1855 m (1613 m\r\nTVD), and top Fensford Formation sandstone at 1934 m (1671 m TVD). Oil and gas were\r\nencountered in the Sognefjord Formation. The GOC was at 1790 m (1567 m TVD) and\r\nthe FWL was estimated at 1828.5 m (1594 m TVD). Strong to moderate fluorescence\r\nwas observed on the cores down to 1844 m (1606 m TVD), but heavy contamination\r\nfrom the oil-based mud made shows detection somewhat uncertain. The upper half\r\nof the oil bearing formation consisted of generally clean sandstones. Below\r\n1555 m TVD the sands were micaceous. Tight calcareous streaks occurred over the\r\nwhole sectio",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}