{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 351,
    "wlbName" : "25/1-5",
    "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 25/1-5 was drilled southeast flank\r\nof the main Frigg structure in the North Sea, about 2.25 km from the discovery\r\nwell 25/1-1. The objectives were to provide data for development of the Frigg\r\nField and calibrate the seismic model.\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 25/1-5 was spudded with\r\nthe semi-submersible installation Deepsea Driller on 24 July 1975 and drilled\r\nto TD at 2259 m in the Paleocene Balder Formation. The well was drilled with spud\r\nmud down to 464 m, with KCl mud from 464 to TD. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Frigg sands were encountered at 1907\r\nm. It was 275 m thick with 225 m net sandstone. The Frigg Formation was gas\r\nbearing down to the GOC at 1976 m, oil bearing down to an an oil/water\r\ntransition zone down to 1982 m and the oil/water contact at 1987 m. The only\r\nshows described in the well were in the Frigg reservoir: "First\r\nsignificant gas increase in drilling was recorded at 1908 m. Sand on cores\r\nshowed a gas bearing facies, i.e. dry outlook, faint direct yellow fluo but\r\nstrong cut. Gas ground began to decrease below 1970 m, becoming nil after 2010\r\nm. Strong direct fluo on cuttings and side wall cores was observed from 1970 m\r\nto 2010 m."\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTwo cores were cut in the Frigg\r\nFormation. Core 1 was cut from 1914 to 1923 m and core 2 was cut from 1928 to\r\n1937 m. cores were cut. FIT fluid samples were taken at 1979.6 m (oil and\r\nfiltrate), 1981 m (oil and filtrate), 1937 m (gas and filtrate), and 1945.5 m\r\n(gas and filtrate).\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe well was permanently abandoned on 12\r\nSeptember 1975 as an oil and gas appraisal 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 clas",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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