Based on flow assurance studies a Pipe-in-Pipe solution was selected to assure the flow for a gas pipeline connecting the well 4-ESS-138 to FPSO Cidade de Vito´ria located in Canapu field. The flow assurance studies also define the value of 0.8W/m2K for the overall heat transfer coefficient (OHTC) in order to prevent hydrate formation. The temperature of 87°C on the wellhead should be preserved to permit the proper gas flow in 20km PIP length between wellhead and FPSO. Canapu field is located in the offshore area of Brazil (Espirito Santo state) in water depths of 1608m. This paper presents the main aspects related to the detailed design, thermo-mechanical requirements, materials specifications, functional qualification tests performed on materials and on pipe-in-pipe systems to satisfy installation constraints defined by the reel-lay method and operational issues.
The first Petrobras Hybrid Riser was installed in Campos Basin and is part of the Roncador P-52 oil export system. This system, which connects the SS platform P-52 (1800m water depth) to the fixed unit PRA-1 (100m water depth), is in operation since November 2007 comprises an 18 in diameter flowline and the Free Standing Hybrid Riser (FSHR). The FSHR is composed by a grouted foundation, 1500m of rigid steel riser, a near surface Buoyancy Can and a flexible jumper connecting the top of rigid riser to the platform. The basic design evolved almost until installation, in October 2007, due to engineering, construction and supplier restrictions.Key concepts of design and main considerations that led to this Hybrid Riser final design are reviewed. Moreover, this paper presents some of the aspects of construction and installation that influenced the implementation and some of the lessons learned are discussed. The Riser foundation and flexible jumper were free issued by Petrobras to Contractor and some of the interfaces over the design are addressed as well.This paper points out some of the key issues to be taken into consideration to improve the design of future projects and presents some important lessons learned that can be used for further studies in ultra deepwater large diameter Hybrid Risers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.