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    "wlbNpdidWellbore" : 2667,
    "wlbName" : "25/11-20",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/11-20 is\r\nlocated East of the Southern segment of the Grane field. The primary objectives\r\nof well 25/11-20 were to prove oil resources within reach of the Grane field\r\nproduction unit that can be produced through the Grane field installation and\r\nto test the geological and geophysical models for non-mounded Paleocene sands\r\nwithin the Licence area. The secondary objectives of well 25/11-20 were to\r\ndefine areas in the licence which can be relinquished and to reduce the uncertainties\r\nassociated with the surrounding prospects. The well location was selected to\r\nprovide an accurate seismic tie, i.e. an area with minimal compaction effects\r\nand away from faults, in an area where there are indications of a thick sand on\r\nthe seismic data.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/11-20 was\r\nspudded with the semi-submersible installation "Treasure Saga" on 8\r\nOctober1995 and drilled to TD at 1828 m in limestones of the Late Cretaceous\r\nTor Formation. The well was drilled water based with seawater and hi-vis bentonite\r\nsweeps down to 1254 m and with KCl / Polymer from 1254 m to TD. Unpredicted\r\nboulders were encountered at 152 m to 157 m, causing low ROP and extra work to\r\nkeep the inclination small, otherwise no significant problems were encountered\r\nduring drilling. Shallow gas was not predicted and not observed\u003c/p\u003e\r\n\r\n\u003cp\u003eNo sands or shows\r\nwere encountered in the Rogaland Group. An internal high acoustic impedance\r\nshale was present at depth 1683 m to 1705 m where Heimdal sands were prognosed.\r\nThe seismic response for this shale in the SOF data set was similar to the\r\nresponse for the Heimdal sand in the Grane Field. Four cores were cut between\r\n1661 m and 1719.5 m in the Balder, Sele, Lista, and Våle Formations. Coring was\r\nstopped 20 m under the prognosed top of the main sand. The well was permanently\r\nabandoned on 23 October 1995 as a dry hole. \u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eTesting\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eNo drill stem test\r\nwas performed.\u003c/p\u003e\r\n\r\n",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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