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    "wlbName" : "2/4-5",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 2/4-5 (named 2/4-4X by operator\r\nPhillips) was drilled to appraise the northern segment of the 2/4-2 Ekofisk\r\ndiscovery. The Ekofisk discovery is located in the Central Trough in the\r\nsouthern Norwegian North Sea and its structure is an anticline, uplifted by\r\nhalokinetic movements of Permian salt. The objective of well 2/4-4 was to test\r\nthe Tertiary and the top of the Late Cretaceous. Planned total depth was 11000\r\nft (3352 m).\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well is Type Well for the Ekofisk\r\nFormation.\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 2/4-5 was spudded with the\r\nsemi-submersible installation Neptune 7 on 21 June 1970 and drilled to TD at\r\n3320 m in the Late Cretaceous Tor Formation. The well was drilled with seawater\r\nand hi-vis mud down to 585 m, with seawater/lignosulphonate mud from 585 to\r\n3217 m, and with seawater/drill-aid mud from 3217 m to TD. Below 584 m 2 - 5 %\r\ndiesel was added to the mud.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Danian Chalk (Ekofisk Formation) was\r\nencountered at 3037 m and the Maastrichtian chalk (Tor Formation) was encountered\r\nat 3164 m. Both formations were hydrocarbon bearing. A total of 86.2 m core was\r\nrecovered in 12 cores in the interval 3094 to 3206 m in the Ekofisk and Tor\r\nFormations. No fluid samples were taken on wire line.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe well was permanently abandoned on 27\r\nAugust 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\u003eFive zones in the Ekofisk and Tor\r\nFormations were perforated for testing. \u003c/p\u003e\r\n\r\n\u003cp\u003eDST 1 and DST 1A tested the intervals\r\n3164 -3203 m and 3177 - 3186 m in the Tor Formation, respectively. DST 1\r\nproduced at maximum 165795 Sm3 gas and 701 Sm3 oil /day on a 24/64" choke.\r\nThe GOR was 236 Sm3/Sm3; the oil gravity was 37.3 deg API. The reservoir\r\ntemperature in the DST1 zone was reported to be 129.4 deg C. DST 1A was\r\nconducted with smaller choke sizes and gave somewhat lower rates than in DST 1,\r\nbut fluid properties were similar.\u003c/p\u003e\r\n\r\n\u003cp\u003eDST 2 tested the interval 3106 -3143 m in\r\nthe Ekofisk Formation, but was",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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