{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 137,
    "wlbName" : "2/1-7",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 2/1-7 was drilled on a\r\nstructure in the centre of the block. The primary target was Rothliegendes\r\nsandstone in a large fault bounded structure mapped at base Zechstein Group\r\nlevel. A secondary objective was Late Jurassic Ula Formation sandstone in an\r\nextension of the 2/1-3 Gyda discovery. In the 2/1-3 well two sequences of Ula\r\nFormation sandstone had been encountered, and the upper of the two had been\r\noil-bearing\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 2/1-7 was spudded with the\r\n3-leg jack installation Glomar Moray Firth 1 on 6 September 1984 and drilled\r\nto TD at 5464 m in the Permian Rotliegendes Group. Pumping lost circulation\r\nmaterial, without changing the mud weight, stopped loss of mud at 1710 m. Top\r\nchalk came in at 3190 m. This whole sequence was drilled with turbine. At 3746\r\nm the drill string got stuck, and the tight interval was located between\r\n2600-2900 m. The string was freed by circulating acidic mud. Full circulation\r\nwas maintained during this whole operation. While pulling out to change bit at\r\n5077 m the drill string was lost in the hole. At the same time 170 bbls of mud\r\nwas lost. One reason for this mud loss could be the "piston effect"\r\ncaused by the drill string falling down the hole. The pipe was fished out piece\r\nby piece, and the stabilisers above the bit were milled out. At 5081 m the\r\ndrill string was screwed off 300 m above the bit. Fishing was successful and\r\ndrilling continued. Drilling was stopped at 5113 a to perform pressure test.\r\nDuring this operation, before reliable results were obtained, the RFT-tool got\r\nstuck in the hole. After extensive fishing the operator decided to plug back\r\nand sidetrack the hole. The technical sidetrack was kicked off at 5092 m, and\r\ndrilled to 5119 m. Problems at this depth made another sidetrack necessary, and\r\nthe hole was plugged back to 4747 m. The new sidetrack was kicked off from 5080\r\nm and dri1led to a TD of 5464 m, which made this hole 4 m short of being th",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}