{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1290,
    "wlbName" : "25/2-12",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/2-12 was the\r\nsecond hole drilled on an NNESSV-oriented structural height in the northwestern\r\npart of the block. Well 25/2-4, which was drilled in 1975 in a more down flank\r\nposition, found a 21 m gas column and a 48 m oil column in the Vestland Group.\r\nThe Statfjord Formation was water bearing in 25/2-4, but its position was not\r\noptimal on the structure with regards to the Jurassic prospects.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe main objective\r\nof well 25/2-12 was to examine the Statfjord Formation higher up on the\r\nstructure than 25/4-2, including getting more information about the oil and gas\r\ndiscovery in the Vestland Group.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well\r\n25/2-12 was spudded 17 July 1988 by Smedvig semi-submersible rig West Vanguard\r\nand completed 13 November 1988 at a depth of 4103 m in the Late Jurassic\r\nStatfjord Formation. A 17 1/2" pilot hole was drilled from 197- 907 m and\r\nthen opened to 26". Sand layers were encountered at 214 m and 259 m RKB,\r\nand MWD measurements showed no indication of shallow gas. Drilling proceeded\r\nwithout any significant problems down to 1366 m where metamorphic gravel\r\nplugged the bit so that it had to be changed. During clean-up of the hole, mud\r\nwas lost to the sand formation at 890 m to 1000 m. "Lost circulation\r\nmaterial" (LCM) was pumped into the well to isolate it. The well was in\r\nperiods unstable.\u003c/p\u003e\r\n\r\n\u003cp\u003eThe Frigg Formation\r\nwas water bearing. The gas readings were at times very high (up to 80 %). There\r\nwas danger of losing the mud in Turonian limestone. Some fractures were\r\nobserved higher up in the section. There were traces of gas in the limestone.\r\nTop Vestland Group came in at 3685.5 m, 112 m deeper than prognosed. The reason\r\nfor this was assumed to be that the top of the Vestland Group had been faulted.\r\nThe fluid contact was set to 3701 m. Analysis of this showed that it was a\r\ncondensate column of 15 m. A total of five cores were cut. Core 1 was a\r\n"junk core". Cores 2 & 3 ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}