{
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    "wlbNpdidWellbore" : 448,
    "wlbName" : "7/8-4",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 7/8-4 was drilled on the\r\nnorthern flank of the Central Graben. The prospect was a\r\nstructural/stratigraphic trap situated on the north flank of a high standing\r\nTriassic fault block. The objective was to test the hydrocarbon potential of a\r\nprognosed Late Jurassic sand body at 3840 m. Isolated sands within the Triassic\r\nwere also postulated as hydrocarbon traps and potential secondary targets.\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 7/8-4 was spudded with the\r\nsemi-submersible installation Nortrym on 11 December 1984 and drilled to TD at\r\n4400 m in Early Triassic sandstones and shales of the Smith Bank Formation. The\r\noverall operation took 72 days from spud. Problems with gumbo and keeping the\r\nhole clean were experienced. A weighted KCl polymer mud was used to keep the\r\nhole open and prevent shale spalling. From 4192 m onwards, problems of tight\r\nhole was experienced with the drill string becoming permanently stuck at 4400\r\nm. Differential sticking was thought to be the problems, so the mud weight was\r\nreduced to compensate for this. While attempting to free the pipe the well\r\nstarted to flow but this was quickly stopped by raising the mud weight. While\r\npulling out of the hole the drill pipe got stuck with the bit at 4382 m. The\r\npipe was unscrewed at 4250 m and during fishing operations two more sections of\r\npipe were lost in the hole, one with the top at 4192 m, the other at 4183 m.\r\nThe operator then decided on a sidetrack, and the hole was cemented back to\r\n4130 m and a sidetrack was kicked off from 4140 m. Eleven days were lost due to\r\nthe plug back and sidetrack operation. The well was drilled with seawater down\r\nto 619 m and with KCl polymer mud from 619 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTwo cores were cut from 3825.5 m to 3859\r\nm in what was believed to be the Ula sandstone of the Late Jurassic, the\r\nprimary objective. Subsequent analysis revealed the Lower Cretaceous to\r\nunconformably overlie Middle Triassic formations with no Jurassic rocks present\r\nat this",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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