{
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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1355,
    "wlbName" : "25/2-12 A",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/2-12 was\r\ndesigned to drill the crest of a NNE-SSW trending westward tilting Jurassic\r\nfault block. The northern extension of this structure was drilled in 1975 by\r\nwell 25/2-4 in a down dip position to well 25/2-12. A 70 m hydrocarbon bearing\r\ncolumn was encountered in the Vestland Group. The Statfjord Formation was found\r\nwater bearing. The main objectives of well 25/2-12 were to appraise and test\r\nthe hydrocarbon discovery of the Middle Jurassic Vestland Group and to explore the\r\nStatfjord Formation up dip from well 25/2-4. Due to an unprognosed fault top\r\nVestland came in 112 m deeper than prognosed in 25/2-12. Hence, side track 25/2-12\r\nA was decided. The main purpose of the sidetrack was to explore the still\r\nuntested Vestland up dip to the West.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eAppraisal well\r\n25/2-12 A was sidetracked from 3099 m in well 25/12-2 on 17 November 1988 by\r\nthe semi-submersible rig West Vanguard and drilled to TD at 3865 m in the\r\nMiddle Jurassic Vestland Group. During drilling the string got stuck at 3692 m.\r\nDrilling was stopped at 3714 m, one metre above the Vestland reservoir. Fishing\r\nwas unsuccessful, and the string was cut at 3485 m. When tripping out the well\r\nstarted to flow. Several days were needed to control the well and finally a\r\ncement plug was set from bottom to 3528 m. The cement was dressed to 3612 m and\r\na 7" liner was set from 3600 m to 2927.5 m. After that the cement was\r\ndrilled out to 3612 m before commencing to drill the 5 7/8" section.\r\nDuring drilling the 5 7/8" phase the string got stuck several times, and\r\nfinally stuck at 3865 m. While jarring the well started flowing again. After\r\ncontrolling the well a 4 1/2" liner was set from 3863 m to 3562 m. Cement\r\nwas drilled out to 3830 m before logging. Due to the problems no open hole logs\r\nwere run in well 25/2-12 A; all logs were run behind casing and no fluid\r\nsamples were taken. No cores were cut. The sidetracked well 25/2-12 A was\r\ncompleted 6 April 1989 a",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
  }
}