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  "LayerName" : "Wellbore - History",
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    "wlbNpdidWellbore" : 1533,
    "wlbName" : "6507/3-1",
    "wlbHistory" : "\u003cp\u003e\u003cb\u003eGeneral\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWell 6507/3-1 is located west-southwest\r\nof the Norne Field on the Dønna Terrace offshore Mid Norway. The prospect,\r\ncalled the Alpha structure, was defined as a horst structure oriented in a\r\nnortheast - southwest direction on the Dønna Terrace, west of the Nordland\r\nRidge in the northern part of the block. The northern part of the structure\r\nextended into block 6607/12. The well was expected to penetrate rocks of\r\nCenozoic-, Cretaceous-, and Jurassic age. The primary objective of the well was\r\nto test the hydrocarbon potential of the Middle to Early Jurassic Fangst and Båt\r\nGroups. Secondary objectives were to test possible reservoirs in the Early\r\nCretaceous (Cromer Knoll Group) and Late Jurassic (Rogn Formation sands). The\r\ncommitment of the well was to drill into rocks of Triassic age or to 5000 m.\u003c/p\u003e\r\n\r\n\u003cp\u003e\u003cb\u003eOperations and results\u003c/b\u003e\u003c/p\u003e\r\n\r\n\u003cp\u003eWildcat well 6507/3-1 was spudded with\r\nthe semi-submersible installation Ross Rig on 12 May 1990, and drilled to TD at 4757 m in Late Triassic sediments of the Åre Formation. After having set the\r\n9 5/8" casing with shoe at 3167 m, an 8 1/2" hole was drilled to 4080\r\nm. This hole, especially the Melke Formation, became very unstable and caused\r\nserious drilling problems. After having worked with stuck pipe and fish, the\r\nhole was finally plugged back to the 9 5/8" casing shoe and sidetracked from\r\n3177 m, (a technical bypass) and drilled to TD. Due to the problems encountered\r\nthe first hole was logged from 3850 m to hole TD at 4080 with MWD only, while\r\nthe sidetracked hole was not logged below 4506 m. The Directional survey shows\r\na practically vertical well with TVD only one meter short of MD down to this\r\ndepth. The well was drilled with seawater and CMC hi-vis pills down to 900 m,\r\nwith gypsum/polymer mud from 900 m to 3183 m, with gel/lignosulphonate mud from\r\n3183 m to 3974 m, and with Kemseal/PAC/Miltemp mud from 3974 m to final TD.\u003c/p\u003e\r\n\r\n\u003cp\u003eTop of the Garn formation was penetrated\r\nat 3608 m. Above this level no",
    "wlbHistoryDateUpdated" : "2026-02-24T00:00:00"
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