{
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      "title" : "This document as JSON"
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  "LayerId" : 254,
  "LayerName" : "Wellbore - History",
  "id" : "464",
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    "wlbNpdidWellbore" : 472,
    "wlbName" : "25/1-8 S",
    "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\u003eThe Frigg Field was discovered by well\r\n25/1-1 in 1971 and set in production in May 1977. Well 25/1-8 S was drilled to monitor\r\nchanges in gas/fluid contact, uncover permeability barriers and pressure\r\ngradients in the Frigg Formation, refine the geological model, and provide ties\r\nfor seismic interpretations. Before production started the Frigg Field fluid\r\ncontacts were: OWC = 1955.9 m TVD MSL and GOC = 1948.2 m TVD MSL. Due to the\r\nclose proximity to the Odin pipeline, the well had to be drilled with a slight\r\ndeviation. The well was to be entered several times to monitor further changes\r\nin the gas/water contact as a response to field production.\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 25/1-8 S was spudded with\r\nthe semi-submersible installation Byford Dolphin on28 May 1985 and drilled to\r\nTD at 2650 m (2572 m TVD / 2547 m TVD MSL) in the Paleocene Lista Formation. \u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=MsoBodyText\u003e\u003cspan lang=EN-GB\u003eTop Frigg Formation came in at 1930.2 m\r\n(1853 m TVD MSL). The formation was gas-bearing with a water saturation of only\r\n6.1% in the gas zone down to the gas/water contact (GWC) at 1901.5 m TVD MSL. A\r\nresidual gas zone with 74.9% water saturation was found from 1901.5 m TVD MSL down\r\nto 1909.3 m TVD MSL. Within this zone, at 1903.5 m TVD MSL was a thin oil layer,\r\nwhich indicated a fingering effect caused by edge water drive. Otherwise the\r\noriginal oil-leg in Frigg had been all swept by water since production start. A\r\nthree phase zone (oil+gas+water) with 51.5% water saturation was seen below the\r\ngas zone from 1909.3 m TVD MSL down to the original GOC at 1948.2 m TVD MSL,\r\nand from 1948.2 TVD MSL down to 1981.1 m TVD MSL there was a zone of residual\r\noil and water with 88.2% water saturation. Below 1981.1 m TVD MSL there was\r\nonly water in the porosity.\u003c/span\u003e\u003c/p\u003e\r\n\r\n\u003cp class=M",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}