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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 97,
    "wlbName" : "2/4-3",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 2/4-3 (named 2/4-2X by operator\r\nPhillips) was drilled to appraise the 2/4-2 Ekofisk discovery in the southern\r\nNorwegian North Sea. The target was to test the Tertiary and the top of the\r\nLate Cretaceous. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 2/4-3 was spudded with the\r\nsemi-submersible installation Ocean Viking on 27 January 1970 and drilled to TD\r\nat 3431 m in the Late Cretaceous Tor Formation. The well was planned vertical,\r\nbut the deviation was significant. Maximum deviation was 1 deg\u00A0 at 618 m, 3\r\ndeg\u00A0 at 1077 m, 11.5 deg\u00A0 at 1316 m, 16.4 deg\u00A0 at 1605 m, 10 deg\u00A0 at 2167 m, 4\r\ndeg\u00A0 at 3002 m, and 1.7 deg at 3292 m. This indicates that TVD RKB is ca 30 m\r\nshallower than MD RKB at TD, but exact records are not available. The well was\r\ndrilled with seawater and hi-vis mud down to 619 m, with CaCl2 / Dextrid\r\n(modified potato starch) from 619 m to 1695 m, and with lignosulphonate /\r\nseawater from 1695 m to TD. One - four percent diesel was added to the mud\r\nbelow 619 m. \u003c/p\u003e\r\n\r\n\u003cp\u003eThe Danian chalk (Ekofisk Formation) was\r\nencountered at 3090 m, and the Late Cretaceous chalk (Tor Formation) at 3253 m.\r\nThe formations were tested hydrocarbon bearing from 3124 m to 3319 m.\u003c/p\u003e\r\n\r\n\u003cp\u003eEighteen conventional cores were cut in\r\nthe well. Core 1was cut in the interval 1705 - 1717 m with only 0.6 m core\r\nrecovered. Cores 2 - 13 were cut in the Danian chalk (Ekofisk Formation), while\r\ncores 14 - 18 were cut in the Maastrichtian chalk (Tor Formation). No fluid\r\nsamples were taken on wire line.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 31\r\nMay 1970 as an oil appraisal.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eTen drill stem tests were carried out\r\nthrough perforations in the 7" liner. DST 1 and 2 tested the intervals\r\n3352 - 3362 m and 3331 - 3341 in the in the Tor Formation. They produced only\r\nwater. DST 3 to 9 tested different zones in the interval from 3124 to 3319 m in\r\nthe Ekofisk and Tor Formations. They produced gas and oil. The oils were in the\r\nrange 33.2 to ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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