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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 879,
    "wlbName" : "6507/7-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6507/7-5 is located on the northern\r\npart of the Halten Terrace off shore Mid Norway and was drilled to appraise the\r\nnorthern extension of the 6507/7-2 Heidrun Discovery. The primary objective was\r\nMiddle and Lower Jurassic sands in a downthrown fault block located NNW of the\r\n6507/7-2 well. Prognosed top Jurassic was at 2308 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eSecondary objective was the Båt Group at\r\nan expected depth of 2394 m. Based on site survey, shallow gas could appear at 512,\r\n570, 618, 746, and 799 m. Prognosed TD was 2675 m.\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 6507/7-5 was spudded with\r\nthe semi-submersible installation Nortrym on 16 January 1986 and drilled to TD at 2660 in the Early Jurassic Tilje Formation. The 26" hole section\r\nwas drilled without marine riser to 1040 m, first as a 17 1/2" pilot hole\r\nwith MWD logging, then opening up to 26". No shallow gas was recorded. The\r\nMWD quality was good, so no electric logging was performed in this section.\r\nSince no riser was used, all returns were to seafloor down to 1040 m. No\r\nsignificant problems were encountered during operations. The well was drilled\r\nwith seawater and pre-hydrated gel down to 1040 m and with KCl/polymer mud from\r\n1040 m to TD. \u003c/p\u003e\r\n\r\n\u003cp\u003eNo sandstone of importance was\r\nencountered above the Middle Jurassic. A hiatus from Late Cretaceous Turonian\r\nto Late Jurassic Oxfordian/Kimmeridgian was observed at 2310 m. Sandstones of\r\nthe Fangst Group were encountered at 2353 to 2424 m. Analysis of cores and logs\r\nindicated good to excellent porosity and permeability in these sandstones, with\r\nthe best reservoir properties towards the top, in the Garn Formation. \u003c/p\u003e\r\n\r\n\u003cp\u003ePoor oil shows were observed in sandstone\r\nlenses in core no 1 from the Shetland Group (2255.0 - 2282.5 m), which\r\nconsisted mainly of claystones. Visible shows of uniform light brown oil were\r\nobserved on cores from top of the Garn Formation down to 2400 m. Below this\r\ndepth the shows were occasionally more patchy, un",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}