{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 281,
    "wlbName" : "7/12-6",
    "wlbHistory" : "\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eGeneral\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eWell 7/12-6 was drilled as an appraisal\r\nwell on the Ula Field in the southern North Sea. The objective was to determine\r\nsand distribution in northern part of the Ula field, and production and\r\ninjection properties of reservoir and aquifer.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eOperations and results\u003c/span\u003e\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eAppraisal well 7/12-6 was spudded with\r\nthe semi-submersible installation Sedco 707 on 10 April 1981 and drilled to TD\r\nat 3700 m in the Triassic Skagerrak Formation. Some hole problems and excessive\r\ncavings due to underbalanced drilling occurred in the 12 1/4" section\r\nbetween 2633 and 3353 m, otherwise the well was drilled without significant\r\ntechnical problems or delay. The well was drilled with gel/seawater and fluid\r\nloss additives down to 480 m and with gypsum/lignosulphonate and fluid loss\r\nadditives from 480 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Ula Formation sandstones were penetrated\r\nat 3406 m. The sandstones were 115 m thick, very fine to fine grained with\r\nporosities from 10 to 25% and permabilities from 1 to 2000 mD. The reservoir\r\nwas oil bearing throughout, no OWC was established. An unexpected Triassic\r\nreservoir of good quality was found below the Ula Formation. The well drilled\r\n179 m into it without reaching the OWC. The reservoir consisted of various\r\ntypes of micaceous sandstones with porosities from 4 to 23% and permabilities\r\nfrom 0.03 to 2600 mD. The first hydrocarbon indication was recorded as a weak\r\noil show at 2440 in siltstone. Further shows were recorded in the Late\r\nCretaceous between 3010 m and 3060 m, however the logs did not indicate any\r\nsignificant mobile hydrocarbon. Hydrocarbon shows were recorded throughout the\r\nUpper Jurassic Ula Formation between 3407 m and 3521 m. Patchy shows were\r\nrecorded in the Triassic interval between 3521 m and TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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