Abstract
Umbilicals are widely used today in various manners by the offshore industry. The design of umbilicals incorporates the mechanical strength to withstand crushing and tensile loads during handling, installation, and service. Some of the technological challenges can be categorised into three items: ultra-deepwater umbilical installation, high-voltage power cables, and integrated production umbilicals (IPUs). At present, no efficient, well-defined design methods provide accurate predictions of the effects of the ultra-deepwater environmental and operational conditions with varying design parameters in the initial design stages of an IPU system. This study developed a practical procedure for IPUs systems under extreme environmental conditions. For an understanding of the thermal characteristics for the crosssectional design of IPU systems, a numerical analysis (finite-element-model)-based parametric study was carried out with the aim of developing design procedures and making recommendations for an optimal IPU umbilical system. The design procedure and the thermal characteristics presented in this paper will provide assistance to the industry in the design and analysis of subsea IPU systems.
Highlights
Umbilicals are one of the important facilities in the subsea production system for offshore oil exploitation
The objective of this study was to investigate the effect of temperatures differences on the design of the thermal characteristics of a profiled integrated production umbilicals (IPUs) cross section subjected to installation and operational conditions
Based on the limited results obtained for the IPU cross-section, it can be concluded that thermal analysis is useful for the optimal design of IPU cross-sections in terms of computational effort and resulting accuracy
Summary
Umbilicals are one of the important facilities in the subsea production system for offshore oil exploitation. It consists of steel tubes, electrical cables, optical fibre cables, fillers, and an inner sheath, which are assembled into an inner core. Heggadal [2] introduced an IPU designed to combine the functions of an umbilical with those of a production or injection flow line and to supply high-voltage power to potential subsea users. Due to their functional intergraded system and cost-effectiveness, IPUs have become increasingly popular in future umbilical systems. For the development and application of IPUs in subsea transformation systems, there are no efficient, well-defined design methods that can provide accurate predictions of the effects of the environmental and operational conditions with varying design parameters in the initial design stages
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