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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 365,
    "wlbName" : "25/10-5",
    "wlbHistory" : "\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eThe 25/10-5 well was drilled to establish\r\nthe presence of an accumulation of Eocene oil sand in the western part of the\r\nBalder Field, and evaluate the geologic concept of sand-shale distribution and\r\nreservoir quality.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 25/10-5 was spudded with the\r\nsemi-submersible installation Glomar Biscay II on 15 June 1981 and drilled to\r\nTD at 2011 m in the Late Jurassic Viking Group. The well was drilled with sea\r\nwater/gel/lignosulphonate.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe top of the Early Eocene reservoir\r\nwas encountered at 1733 m (1708 m sub sea), as prognosed.\r\nThe reservoir consisted of thin sandstone beds interbedded with shale and was\r\noil bearing. A 49.5 m gross oil column was found down to an OWC at 1782.5 m.\r\nThe net oil sandstone thickness was 18.2 m. Late Eocene Grid Formation\r\nsandstone was penetrated at 1398 m to 1443 m and Paleocene Heimdal Formation\r\nsandstone from 1905 m to 1929 m. These were both water wet without shows.\u003c/p\u003e\r\n\r\n\u003cp\u003eFour cores were cut in the Lower Eocene\r\nreservoir sequence. No wire line test or fluid sampling was carried out.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 17\r\nJuly 1981 as an oil appraisal well.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eTwo drill stem tests were performed in\r\nthe Early Eocene reservoir. DST 1 perforated the interval 1756 m to 1753 m and\r\nproduced 171 Sm3 oil/day. The oil gravity was 25.3 deg API and the gas/oil ratio\r\nwas 59 m3/m3. DST2 perforated the intervals 1732 - 1740 m and 1756 - 1763 m. It\r\nproduced 515 Sm3 oil/day. The oil gravity in DST2 was 25.5 deg API and the gas/oil\r\nratio was 59 m3/m3. \u003c/p\u003e\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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