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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1302,
    "wlbName" : "34/10-33",
    "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 34/10-33 was the sixth well drilled\r\nto reservoir level on the Gullfaks South structure. The main objective of the\r\nwell was to appraise the oil and gas reserves in the Brent Group on the\r\nnorthern part of the structure. The gas/oil and oil/water contacts were to be\r\nconfirmed at 3324 m and 3395 m MSL respectively. Secondary objective was to\r\npenetrate 50 m of the Statfjord Formation to obtain data to better understand\r\nthe structural development in the area, and also update the geological model\r\nfor the upper part of the formation. A positive result would lead to the\r\ndrilling of a horizontal testing well as a sidetrack from this well.\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\u003eWell was spudded with the\r\nsemi-submersible installation West Delta on 25 September 1988 and drilled to TD\r\nat 3870 m in the Early Jurassic Statfjord Formation. There was some shallow gas\r\nat 477 - 478 m. Due to this the 20" casing was set at 450 m. There was a\r\nproblem with a leakage in the BOP. The drill string got stuck when setting the\r\n13 3/8" casing and the MWD and drill bit had to be changed. The well was\r\nclose to vertical down to ca 2500 m. From there the well built inclination\r\ngradually up to 20 deg at TD. At TD true vertical depth is estimated to be ca\r\n20 m less than measured depth. The well was drilled with spud mud down to 483\r\nm, with gypsum/polymer mud from 483 m to 3161 m, and with\r\ngel/lignosulphonate/lignite mud from 3161 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop Brent Group, Tarbert Formation came\r\nin at 3186 m with gas and oil. FMT data showed a gas/oil contact at 3268 m, 85\r\nm higher than prognosed. Approximately 150 m of oil was found vertically down\r\nto top Dunlin Group at 3424 m, much more than expected. No oil/water contact\r\nwas seen. There was a pressure shift of 1.5 - 2 bar at",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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