ABSTRACT:

The paper describes two minimum-cost, self-erecting, platform designs and one caisson structure design that can be installed without heavy lifting equipment in offshore waters with seasonal ice conditions. One of these designs has been built and is in operation in Cook Inlet, Alaska and the paper describes how platform Osprey was installed. A different design concept allows installation in deeper water, again without the need for heavy lifting equipment. The outrigger caisson design concept can be installed with a jack-up drilling unit and would have application as a satellite platform structure. These structures have application for installation in offshore areas with seasonal ice cover and/or significant tidal action and where there is no existing offshore construction infrastructure. Use of the minimum platform and caisson structures enables development of marginal fields that heretofore could not be developed because the cost of mobilizing and demobilizing heavy lifting equipment made development uneconomic

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