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In some areas of the world where offshore oil has been found the natural environment is hostile. In Cook Inlet, for example, 15 to 30 ft tides, tidal currents of 6 to 8 knots, and floating ice contribute to the difficult task of exploration and erection of drilling platforms. The importance for detailed foundation design data becomes significant when high loads, 2000 tons per pile vertical and about 100 tons per pile lateral, must be resisted. To perform the foundation investigations in Cook Inlet, large floating and jackup oil field exploration equipment and personnel were employed. Test borings at twelve platform sites were drilled in water at depths of 50 to over 100 ft. Subsurface explorations were accomplished efficiently to depths up to 340 ft below the mudline. The soil profiles were logged to the detail and accuracy generally associated with borings drilled on land, while good soil samples were obtained for the laboratory with a recovery rate of better than 95 percent. The data were completely satisfactory for design and construction of the platforms.
offshore drilling, drilling rigs, pile foundations, underwater structures, soil profiles, subsurface investigations, boring, ocean tides, ice formation, loads (forces)
Associate, Dames & Moore, San Francisco, Calif.