{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 216,
    "wlbName" : "30/7-8",
    "wlbHistory" : "\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 30/7-8 was drilled in the Norwegian\r\npart of the Shetland Basin. The primary objective was to test the hydrocarbon\r\npotential in the Middle Jurassic Brent group, which had previously proved gas\r\nand condensate bearing in wells 30/4-2 and 30/7-6. The Early Jurassic Cook\r\nFormation and Statfjord Group were secondary targets. The planned TD was 4600 m\r\nin the Triassic Red Beds.\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 30/7-8 was spudded with\r\nthe semi-submersible installation\u00A0 Treasure Seeker on 19 November 1980 and\r\ndrilled to 4287 m in the Middle Jurassic Brent Group . The drill pipe became\r\ndifferentially stuck at 4069 m. After unsuccessful fishing, the well was\r\nsuspended with top of the fish at 4058 m, and 4287 m became official TD for the\r\nwell. The well was drilled with seawater and hi-vis pills down to 215 m, with\r\nwater based "lost circulation mud" from 215 m to 962 m, with\r\ngypsum/lignosulphonate mud from 962 m to 2648 m, with a bentonite/lignosulfonate/lignite\r\nmud type from 2648 m to TD. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eFrequent traces of oil shows were\r\ndescribed in many intervals from 1820 m and down to well TD. Most of the shows occurred\r\nin limestone stringers and were rated poor. The primary target Middle Jurassic\r\n(Bathonian-Bajocian) Brent Group reservoir was encountered at 4066 m. The shows\r\nin the Brent Group sandstones were rated good.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eFive cores were cut in the well. One was\r\ncut in the Draupne Formation from 3888.5 m, while the other four were cut in\r\nthe Brent Group reservoir section from 4082.3 m to 4129.3 m. No fluid sample\r\nwas taken.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was suspended on 4 April 1980 as\r\na gas/condensate appraisal well. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyTex",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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