{
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      "title" : "The collection document"
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 113,
    "wlbName" : "15/12-5",
    "wlbHistory" : "\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 15/12-5 was drilled on the Beta\r\nCentral structure ca 3.3 km north-east of the 15/12-4 Varg discovery well in\r\nthe North Sea. Primary objective was the Jurassic sandstones. Secondary\r\nobjective was the Frigg Formation sand and fractured limestone of Cretaceous\r\nage. Seismic anomalies indicated shallow gas. Prognosed TD was 3100 m RKB in\r\nsandstone of Triassic age.\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 15/12-5 was spudded with the\r\nsemi-submersible installation Ross Isle on 12 March 1986 and drilled to TD at\r\n3150 m in the Late Triassic Skagerrak Formation. No shallow gas was\r\nencountered. Drilling proceeded without significant problems. The well was\r\ndrilled with Spud mud down to 217 m, with gel/seawater/XC-polymer from 217 m to\r\n619 m, with gypsum/polymer mud from 619 m to 2889 m, and with\r\ngel/lignosulphonate/lignite from 2889 m to TD.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop Cretaceous came in at 2457 m, and top\r\nJurassic at 2841 m. Top of the reservoir, an Oxfordian sandstone, was\r\nencountered at 2918 m with good shows. The OWC was found at 2942 m, 28 m below\r\nthat of well 15/12-4. This is probably due to a flow barrier caused by the\r\nfault system with a maximum throw of ca 100 m that separates the Beta West and\r\nBeta Central structures. Due to FMT pressure measurements and fluid samples,\r\nStatoil decided to go for "sole risk" testing, since Esso denied\r\nparticipating in the testing program.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eThree cores were cut in the interval 2892\r\nm to 2967 m with 100% recovery. The core-log depth shifts were small, in the\r\nrange 0.0 to -0.5 m for all three cores. FMT fluid samples were taken at 2919.3\r\nm (oil), 2923.5 m, 2937.0 m (oil), and at 2941.5 m (water mud filtrate and a\r\nlittle oil).\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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