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    "wlbNpdidWellbore" : 1227,
    "wlbName" : "6406/3-5",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6406/3-5 was designed to explore\r\nthe Lambda structure and was the first well on the structure. The Lambda\r\nstructure is a flat-lying horst situated in the NE corner of the block.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe primary purpose of the well was to\r\nfind hydrocarbon accumulations of significant amounts in the Middle and Lower\r\nJurassic sandstones of the Fangst Group and Tilje Formation. Secondary\r\nobjectives were to verify the interpretation regarding the structural closure\r\ntowards north, and to verify the geophysical and structural interpretation and\r\nimprove the geological, paleontological and geochemical understanding of the\r\narea. The well was planned to TD in the Åre Formation.\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 6406/3-5 was spudded with\r\nSmedvig Drilling semi-submersible rig West Delta on 3 April 1988 and drilled to\r\na total depth of 4283 m in the Early Jurassic Tilje Formation. Shallow gas was\r\nregistered at 570 m. After pulling out to cement this zone, it was impossible\r\nto get back into the hole again. After a new spud 3 May, the 30" was set\r\nat 418 m, and 20" at 538 m. A new shallow gas zone was registered at 813\r\nm, and the mud was weighted to 1.35 g/cm. The circulation was lost at 1116 m,\r\nand the section was cemented. After this drilling progressed with a mud weight\r\nof 1.25 g/cm3. This resulted in lost circulation at 1340 m. Both times it was\r\nassumed that that the circulation was lost in the zone around 562 m. The hole\r\nwas cemented back and drilled to 607 m where a new leak-off test up to 1.34\r\ng/cm was performed. This time there were no problems with the drilling to 1749\r\nm (setting depth of 9 5/8" casing) with mud weight of 1.25 g/CM3. Further\r\ndrilling to TD proceeded without significant problems. The well was drilled\r\nwith spud mud down to 545 m, with gypsum/polymer mud from 545 m to 3841 m, and\r\nwith gel/lignite/lignosulphonate mud from 3841 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop Fangst was encountered at 3817 m.\r\nThere were weak shows in the top ten",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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