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    "wlbNpdidWellbore" : 2358,
    "wlbName" : "25/11-18",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 25/11 -18 was\r\ndrilled to appraise the 25/11-15 Grane discovery drilled in 1991. The primary\r\nobjectives of 25/11-18 were to confirm beyond reasonable doubt recoverable oil\r\nreserves greater than 30 million Sm3 in the Heimdal Formation in the Grane\r\nDiscovery prior to initiating PDO activities; to obtain an Utsira formation\r\nwater sample and water production rates in order to design the water injection\r\nsystem for the Grane Field; to confirm top and base reservoir, reservoir development,\r\ncontinuity, and quality of Heimdal sand in order to reduce the uncertainties in\r\nthe resource estimates; to obtain velocity information as input to depth\r\nconversion model for the Grane Field; and to test coiled tubing drilling/coring\r\ntechnology as concept for future cost savings.\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\n25/11-18 was spudded with the semi-submersible installation "West\r\nVanguard" on 10 August 1994 and drill to a total depth of 1875 m in the\r\nLate Cretaceous limestones of the Hod Formation. Due to technical problems it\r\nwas not possible to do wire line logging at TD of the original well. The well\r\nwas technically sidetracked (25/11-18 T2) with kick-off at 1390 m. The well was\r\ndrilled with spud mud through the 36" and 24" sections down to 563 m,\r\nwith polymer mud through the 17 1/2" section to 1183 m, with "ANCO\r\n2000" mud from 1183 through the 8 1/2" section and into the slim 4\r\n1/8" section down to 1690 m where the hole was displaced to\r\n"AQUACOL" mud.& Drilling of\r\nthe 4 1/8" section continued with "AQUACOL" mud down to TD at\r\n1860 m. The technical sidetrack was drilled as a 6" hole to final TD at\r\n1875 m using KCl / Polymer mud. Coiled tubing drilling and coring and slim hole\r\nlogging was proven possible from an offshore floater with acceptable quality on\r\ngeological information. Operations, however, were hampered by problems related\r\nto junk and hole instability due to low mud",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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