{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 515,
    "wlbName" : "17/9-1 R",
    "wlbHistory" : "\r\n\r\n\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 17/9-1R is located in the Åsta\r\nGraben in the North Sea, ca 30 km north of the 17/12-1R Bream Discovery well.\r\nThe primary objective was to evaluate sands at the base of the Jurassic\r\nsequence. The structure is not associated with mobile salt, which is the case\r\nfor the Bream Discovery. The first entry was suspended on 6 November 1973 at\r\n2816 m when the riser was lost in a storm. The re-entry 17/9-1R was made to\r\nrecover and repair the damaged stack on the sea floor. A deeping program was\r\ndesigned to 3658 m to test the Triassic and possible Zechstein sand intervals.\r\nAlso a complete logging program was designed to include the portion of original\r\nhole below 2616 m, which was not logged due to storm damage to drill ship.\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 17/9-1 was re-entered (17/9-1R) with\r\nthe drill ship Glomar Grand Isle on 12 May 1974. The broken BOP stack left on\r\nthe original hole was recovered and repaired by divers. A total of 7 days and\r\n11 lock-out dives in 159 m water depth were required for these operations.\r\nAfter successful re-entry well bore 17/9-1R was drilled to TD at 3161 m in Late\r\nTriassic sand and shale of the Skagerrak Formation. The well bore was drilled\r\nwith a lignosulphonate/seawater mud from re-entry point to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe upper section of the Skagerrak\r\nFormation, from 2999.2 m to 3029.7 m, had sandstone with apparent porosity and\r\nquestionable traces of dead oil. Sands penetrated in the interval from 3109 m\r\nto TD had no shows. The sands were found in thin zones and the potential\r\nreservoir quality was considered very poor. Organic geochemical analyses\r\ndetected no significant source rock potential in the re-entry; the Late\r\nJurassic shales penetrated in the first entry (17/9-1) thus remain as the only\r\nsignificant source rock in the total well bore. The well was found immature;\r\npossibly marginally mature towards the Late Triassic at TD (%Ro = 0.5). One\r\norganic geochemical study (Robertson Research) inferred "traces",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}