Th(s paper was prepared for presentation at the Offshore Technol~Con feren&s held m Houstm, Texas 6-9 May 19% Thm pawr was Wetted for presentabon by the OTC Program Ccmmttee follmwng revww of (nforma(mn wnlamed In an abstract submltled by the autfmrs Contents of Ihm paper as presented have not been revwwed by the Offshore Technology Conference and are subpcf lo correctmn by the authors Tlw material, as presented, dms not rmcesserdy reflect any posmon of the Offshore Techrmlcqy Conferenc9 of 11sDfiicers Pemnlss!On to copy IS IImlted 10 an abstract of not mwe than 300 words Illustrations may not be cnpmd The abstrw should Wntatn COnsplcucus acknowledgment of where and by whom the paper .+ms presented AbstractOffshore platforms with integrated, lift installed decks have become increasingly common design concepts in the last ten years based on the availability of super heavy lift crane vessels in certain parts of the world. High installation costs for these lifting vessels have led operators to investigate alternate installation methods. The integrated, float-over ("IFO') deck concept has been utilized several times in the last I 7 years. Recent successful design and installation experiences with integrated, float-over decks in the Far East have encouraged operators and designers to consider this concept more frequently for applications in other areas. The purpose of this paper is to describe some of these recent experiences and how the experience might be applied for similar offshore developments in the future. Design and installation considerations are reviewed and recommendations made for future applications of the concept.The concept consists of a steel topsides deck structure which is conventionally loaded out onto a floating transportation barge. After transportation to the offshore location, the barge is maneuvered ("docked") inside the legs of a platform substructure and installed ("mated") by lowering down the transportation vessel. Depending on the weight of the integrated deck and the directionality and magnitude of prevailing environmental conditions, a passive, partially active, or fully active mating system is utilized for the load transfer operation. The separate benefits of the integrated deck concept and the float-over deck concept make this an attractive combined concept worthy of application for different sizes and weights of topsides and varied offshore locations, The benefits for design, fabrication, installation, hookup/commissioning, operations, and schedule are summarized for the integrated, float-over deck concept compared with modular, lift installed decks. The paper discusses the development of various details for particular applications. The development of a platform structural configuration based on the weight of the topsides, transportation vessel selection, and required size of vessel opening in the structure are discussed. Installation equipment including vessel systems (fendering, mooring, and rapid ballasting) and load transfer systems (structure fendering, alignment, guides, and pas...
Deepwater discovery development activities can be located in remote locations far from existing infrastructure like other facilities and pipelines. Major deepwater developments typically consist of subsea wells tied back to floating surface production facilities such as semisubmersibles, SPARs, TLPs, or FPSOs. The choice of production and export options for liquid hydrocarbons and gas is important and is affected by the distance to other infrastructure, the waterdepths involved, geohazards, reservoir fluid characteristics, production rates, and reserves. Another important factor is whether adjacent undeveloped discoveries exist to potentially share facilities and export options. Conventional production and export options involve oil and gas production facilities and pipelines with shipping pumps or compression as required to reach the closest transmission pipelines or onshore markets. In SE Asia, deepwater developments are often located in remote locations hundreds of kilometers from markets onshore, so the development production and export options must be wider in order to obtain economic and timely choices. In addition to pipeline options, liquid hydrocarbons can be stored offshore in the floating production facility or in an adjacent FSO, then offloaded and shuttled to markets by tankers. Gas production and export options can include long distance gas pipelines, Compressed Natural Gas (CNG) vessels, purity product (butane and propane) liquefied petroleum gas (LPG) FPSOs, methanol/DME FPSOs, and floating LNG FPSOs. This paper will show some of the technical concepts, risks, costs, and economics involved in making these choices.
This paper is based on experience involving the design and fabrication of internally stiffened tubular steel nodes for the Marathon Brae A and B platform jackets.These fixed steel platforms are located in approximately 100 metres of water in the United Kingdom sector of the North Sea, 250 kilometres off the northeast coast of Scotland. Each jacket contained over 100 nodes which were fabricated at various sites by different fabricators.Different fabrication procedures and techniques resulted in certain experiences and observations.In reviewing the results of these node fabrication activities, specific recommendations are made concerning node design and fabrication.
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