{
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 52,
    "wlbName" : "15/3-5",
    "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 15/3-5 was drilled on the Gudrun\r\nTerrace, east of the 15/3-1 S Gudrun Discovery in the North Sea. Well 15/3-5\r\nwas drilled in a downdip position of a structure explored by the well 15/3-4,\r\nwhere oil bearing reservoirs of Middle Jurassic age were tested. The main\r\nobjectives of 15/3-5 were to find the extension of these reservoirs and to\r\ndefine a hydrocarbon/water contact. \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 15/3-5 was spudded with\r\nthe semi-submersible installation Byford Dolphin on 28 December 1983 and\r\ndrilled to TD at 4130 m in the Middle Jurassic Sleipner Formation. Drilling was\r\nsuspended at 195 m due to bad weather. The well was re-spudded on 6 January 25\r\nm west of the original location. Some technical problems with the BOP occurred\r\nafter setting of the 20" and 13 3/8" casings. A seat protector got\r\nstuck in the riser during drilling of the 17 1/2" hole. Drilling breaks\r\noccurred at 3943 m, 3954 m, 4018 m, 4032 m and at 4041 4043 m in the 8 1/2"\r\nhole section. The well was drilled using water based mud.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop Draupne Formation was encountered at\r\n3808 m, followed by the Heather Formation at 3881 m, and the target Middle\r\nJurassic Sleipner Formation at 3935 m. Several thin reservoir zones were\r\npenetrated in the Sleipner Formation. The sands were interpreted as minor\r\nfluvial channels (2 to 5m in thickness) deposited in two main sequences. Four\r\nof the channels were oil-bearing with an oil gradient of 0.61 bar/10 m based on\r\npressure measurements. An OWC could be established at 4022.6 m. Pressure\r\nmeasurements showed that the upper fluvial channel sequence is over-pressured,\r\nand not in contact with the sands encountered in well 15/3-4. The lower fluvial\r\nsequence could be connected between the two wells. Petro",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}