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    "wlbNpdidWellbore" : 2701,
    "wlbName" : "25/11-21 S",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/11-21 S was\r\ndrilled on the Grane Field. The primary objectives of well 25/11-21 S were to\r\ncalibrate the depth conversion model with reference to top and base of the\r\nGrane reservoir and the oil-water contact, and to investigate horizontal and\r\nvertical reservoir barriers and reservoir heterogeneities. The secondary\r\nobjectives of well 25/11-21 S were to obtain reservoir and fluid data and to\r\ninvestigate uncontaminated initial water saturation values in the oil zone. The\r\nwell location was selected to allow building up hole angle for later drilling\r\nof a horizontal section (25/11-21 A) at the required depth and coordinates and\r\nat the same time to provide an accurate seismic tie, i.e. an area with minimal\r\ncompaction effects and away from faults, in an area where there are indications\r\nof a thick sand on the seismic data.\u003c/p\u003e\r\n\r\n\u003cp\u003eSidetrack well 25/11\r\n-21 A was drilled to obtain 600 m to 900 m of horizontal reservoir information.\r\nThe objectives were to appraise the reservoir in terms of reservoir quality and\r\nto confirm the structural top and base reservoir maps; to obtain lateral\r\nvelocity information for calibration of the depth conversion model; to identify\r\npossible reservoir heterogeneities indicated on seismic; and finally to perform\r\nan extended test production in the horizontal section of the well. \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\n25/11-21 S was spudded with the semi-submersible installation "Treasure\r\nSaga" on 23 October 1995 and drilled to TD at 1957 m (1863.5 m TVD MSL) in\r\nLate Cretaceous Hod Formation. The well was drilled with seawater and hi-vis\r\nbentonite sweeps down to 1270 m and with KCl / Polymer mud from 1270 m to TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eHeimdal Formation\r\nsand was penetrated at 1788 m (1711.5 m TVD MSL). A reservoir thickness of 88 m\r\n(79.5 m TVD) was defined, giving a net pay of 57.9 m. The pressure data from\r\nthe Heimdal Formation indicates a 0.4 bar pressure difference to well 25/11-18\r\nT2 and 1.7 bar difference to ",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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}