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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1604,
    "wlbName" : "6407/6-4",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6407/6-4 drilled the Mikkel\r\nStructure in the Bremstein Fault Complex, which separates the Trøndelag\r\nPlatform in the east from the Halten Terrace in the west. The structure is an\r\nanticline aligned north-south. The well was planned to reach a total depth of\r\n3150 m. There were no anomalous amplitudes at the planned well location, but there\r\nwas an indication of shallow gas at 401 to 505 m. The purpose of drilling was\r\nto test the possibility of a significant oil leg in the southern part of the\r\nMikkel Structure and to test the communication between the Garn- and Ile Formations\r\nin the southern part of the structure.\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 6407/6-4 was spudded 31\r\nOctober 1990 by the semi-submersible installation Ross Rig and drilled to TD at\r\n3126 m in Early Jurassic sediments of the Åre Formation. The well was started\r\nwith a 9 7/8" pilot hole down to 1088 m due to the possibility of shallow\r\ngas. No shallow gas was encountered. The well was then opened up and drilled with\r\nsea water and viscous pills down to 1085 m, and with KCl/polymer mud from 1085\r\nm to TD. No significant technical problems were encountered in the operations. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe Garn Formation was penetrated at 2651\r\nm (26 m deeper than prognosis) and was 101 m thick. The reservoir quality of\r\nthis sandstone was good. The only oil shows recorded during the drilling were\r\nin the Garn Formation at 2658 - 2686 m. These were of a poor quality consisting\r\nof very dull yellow direct fluorescence, weak light yellow streaming cut fluorescence\r\nwith a milky cut colour. The shows were patchy with no oil bleeding or\r\nhydrocarbon odour being noted. \u003c/p\u003e\r\n\r\n\u003cp\u003eTwo cores were cut in the well, the first\r\nin the Garn Formation of the Fangst Group and the second in the Åre Formation\r\nof the Båt Group, both with 100% recovery. The RFT tool was run in the Båt and\r\nFangst Groups. A comparison of pore pressure in the Ile and Tilje Formations\r\nshow they have slightly higher pore press",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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