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The Studying on Towing Behaviour of Bucket Foundation Offshore Platform with Air Cushions

Author: LiuJianHui
Tutor: DingHongYan
School: Tianjin University
Course: Construction engineering and management
Keywords: Towage Air cushion Bucket foundation Offshore platforms Stability Shallow water
Type: PhD thesis
Year: 2009
Downloads: 126
Quote: 1
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The bucket foundation offshore platform is a mobile oil production facilities, the structure is easy to install and transport, it can significantly reduce the time and cost of offshore construction operations, and can be reused, especially suitable for the development of marginal oil and gas fields. The bucket foundation offshore platform Flotation drag the Air is relying on its lower multiple barrel cushion and water plug coupled parallel springs provide support for a new type of sea towage way. Small scale model test system based on the three-cushion and barrel basis of four air-cushion support offshore platform the towage power characteristics of, exploring this new either reuse but also self-floating towage towage, offshore platform stability the overall movement of the towed platform acceleration performance; through physical model tests, physical quantities of each cylinder barrel cushion pressure, the pressure of the water plug and streamer tension measurement and test signal waveform analysis and spectrum analysis; multi cushion and water plug coupling the the spring support floating body fluid-structure interaction mechanism of action; draft of the lower part of the cushion support platform cylinder, barrel cushion and water plug coupling spring stiffness and internal factors, and the inclination of the towed platform, streamer length drag flight speed as well as external factors such as waves and water depth influence of platform towing stability. Innovation and research include the following aspects: towing preset certain inclined angle to balance the pitching motion when towing is beneficial for improving the towed platform stability; platform length of cable length is less than 3 the when towed platform heading stability; shallow water depth allows a more stable platform heading. Based on the analysis of the test data and the fast Fourier transform spectrum, bucket foundation platform supported by multi-cushion flotation towing movement incentive streamer mode. Cushion with water plug vibration frequency as well as the the the towed platform acceleration frequency with a frequency towline tension harmonic component equal to the frequency equal to encounter slight wave theory by the wave frequency, wave velocity and towage speed calculated frequency and streamer tension pulse waveform reproduction cycle is equal to its fundamental cycle. Towing based on multivariate statistical analysis using principal component analysis, factor analysis, to find out the correlation between variables, and then according to their relevance to cluster analysis to identify the most dangerous combination of towage and decide on the most dangerous combination of characteristics mechanics parameters and the various conditions towage state classification rating. Barrel cushion wave resistance to distinguish it from the the traditional bottom end of the closed hull wave resistance. Wavemaking resistance low towage, towing resistance, the cylinder cushion wave resistance and wave resistance coupling spring to cushion and water plug main; higher speed towage, towing resistance to shape resistance based.

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CLC: > Industrial Technology > Oil and gas industry > Offshore oil and gas exploration and development > Offshore oil and gas construction projects
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