{
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  "LayerName" : "Wellbore - History",
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    "wlbName" : "7/12-4",
    "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 7/12-4 was drilled as an appraisal\r\nwell on the Ula Field in the North Sea. The main objective was to evaluate the\r\nextent and hydrocarbon potential of the Late Jurassic sands in the south\r\neastern flank of the structure. \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 7/12-4 was spudded with\r\nthe semi-submersible installation Nordskald on 11 September 1977 and drilled to\r\nTD at 3623 m in Early Jurassic sediments of the Bryne Formation. Operations\r\nproceeded without significant problem. The well was drilled with fresh\r\nwater/gel down to 498 m and with lime/Drispac mud from 498 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe target reservoir Ula Formation was\r\nencountered at 3445 m, while the underlying Bryne Formation came in at 3529 m. Net\r\nsand in the reservoir was 73 m with porosity from 10 to 23%, permeability from\r\na few millidarcy to 1750 millidarcy, and water saturation from 5 to over 60%. The\r\nreservoir was oil-bearing with a possible OWC at 3551 m in the Bryne Formation based\r\non disappearance of oil shows; however, drill stem tests showed that the producible\r\ncontact between oil and water was between 3530 and 3536 m.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eSeven cores were cut from near top Ula\r\nFormation at 3447.5 m to 3556.7 m in the Bryne Formation. The recovery was 100%\r\nin core one to six and 96% in core seven. RFT fluid samples were taken at 3458\r\nm (oil, emulsion and water), 3467 m (emulsion) and at 3528 m (water)\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was suspended on 12 December\r\n1977 for possible use as a producer at a later stage. It is classified as an oil\r\nappraisal well.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cb\u003e\u003cspan lang=EN-GB\u003eTesting\u003c/span\u003e\u003c/b\u003e\u003cspan lang=EN-GB\u003e \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eProduction test",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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