{
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  "links" : [
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      "title" : "The collection document"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "53",
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    "OBJECTID" : 53,
    "wlbNpdidWellbore" : 55,
    "wlbName" : "30/9-3",
    "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 30/9-3 was drilled on the Gamma West\r\nstructure on the Oseberg Fault Block in the northern North Sea. The primary\r\nobjective was to find hydrocarbon accumulations in the Middle Jurassic Brent\r\nGroup. Secondary objective was to find additional hydrocarbon accumulations in\r\nthe Early Jurassic. Planned TD was ca 75 m below a possible intra Triassic\r\nmarker to a depth of 4188 +/- 100 m\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\u003eWildcat well 30/9-3 was spudded with the\r\nsemi-submersible installation Nortrym on 31 December 1983. The well was drilled\r\nto a depth of 3113 m into Drake Formation shales where the pipe got stuck and\r\nparted when pulling out of hole for logging. The fish was not recovered and no\r\nwire line logs were recorded below 1713.5 m due to fish in hole. All lithostratigraphic\r\ninterpretation below this point is therefore based on cuttings description,\r\ncore description, chromatograph data and ROP information. A sidetrack was\r\ndecided to complete the well programme. The well was drilled with spud mud down\r\nto 625 m and with Invermul/EZmul Oil Based Mud from 625 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThe Brent Group (2712-3045 m) consisted\r\nof a 259 m thick Ness Formation (2712 - 2971 m) made up of sandstones with stringers\r\nof shale, siltstone and coal and 74 m of Etive Formation (2971 - 3045m)\r\nsandstones. Based on chromatograph analysis on hydrocarbon samples extracted\r\nfrom core samples a GOC was found at ca 2734 m and an OWC at ca 2815 m, both\r\nlocated in the Ness Formation. From core and chromatograph data the Ness\r\nFormation had a gross pay of 103 m. The net gas pay was estimated to 22 m and\r\nthe net oil pay to 36 m giving a total net pay of 58 m (cut off values porosity\r\n< 12%, permeability < l mD). The average porosity was calculated from\r\ncores to 22.5 % and average",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}