{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1989,
    "wlbName" : "30/9-B-18",
    "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 30/9-B-18 was drilled as a\r\ndevelopment well on the 30/9-1 Oseberg Discovery in the North Sea. It was\r\ndrilled as a penetration well prior to the horizontal well 30/9-B-18 A. The\r\nobjective was to accurately locate the oil/water contact in the Oseberg Formation\r\nand to give structural information and exact target depth for the horizontal\r\nsection of the production well 30/9-B-18 A. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe NSO-1 geochemical standard oil was\r\nproduced from 30/9-B-18 A.\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\u003eDevelopment well 30/9-B-18 was spudded on\r\n10 June 1992. It was drilled from the Oseberg B platform   to TD at 3980 m\r\n(2814 m TVD) m in the Early Jurassic Drake Formation. The target of the well\r\nwas on the Oseberg Alpha Structure approximately 2.5 km south-east of the\r\nOseberg B platform. Serious hole cleaning problems were evident throughout the\r\n12 1/4" section, causing a sidetrack from 1448 m. The well was drilled\r\nwith spud mud down to 1155 m, with ANCO 2000 mud from 1155 to 3342 m, and with\r\noil based Safemul mud from 3342 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well drilled through a 121 metres\r\nvertical section of the Brent Group, which is 10 metres more than prognosed,\r\nand the oil-water contact was established at 3878 m MD (2767 m TVD). Good shows\r\nwere observed on the cores from the Oseberg Formation, otherwise no shows\r\ndescriptions were reported from the well. RFT pressure points proved an 11 bar\r\ndepleted oil gradient compared to the initial Oseberg-Rannoch-Etive gradient in\r\nthe Alpha structure.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTwo cores were cut in succession from\r\n3859 to 3903 m in the Oseberg Formation. The core-log depth shift is +2 m for\r\nboth cores. The RFT was run on wireline to record pressure points in the",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}