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Investigation on Configuration and Construction Technics of S-lay for Deepwater Submarine Pipelines

Author: ZhouJun
Tutor: JinWeiLiang；GongShunFeng
School: Zhejiang University
Course: Structural Engineering
Keywords: submarine pipeline pipelaying catenary theory stinger lift-off point sea bottom S-lay method
CLC: U175
Type: Master's thesis
Year: 2008
Downloads: 576
Quote: 16
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Abstract


Submarine pipe is the lifeline in the exploitation of marine oil and gas resources. Because of the severe ocean environment, pipelines inevitably subject to unpredictable risks and thus be very vulnerable, especially when they sustain external pressure, bending moment and tension simultaneously. In general there are three kinds of pipe-laying techniques can be used in the deepwater projects, which are respectively S-lay, J-lay and reel-lay methods, and the S-lay method is the most applicable one, it can be used to lay pipes in both shallow water and deepwater seas. Due to its good applicability, there is a great need to investigate the S-lay method and analyze its laying configuration of pipelines. The work presented in this paper is motivated by the construction need of deepwater submarine pipelines. The current state-of-arts and characteristics of the three methods are detailedly introduced, and the special studies are focused on the deepwater S-lay method. The catenary theory is applied to establish static equilibrium differential equation of pipe section, the natural catenary and stiffened catenary procedures are developed to calculate the laying configuration, bending moment and tension of pipelines. The sensitivity analysis of parameters influencing pipe configuration, tension and ultimate laying depth is carried out, and some technical advices are brought forth for deepwater pipe-laying. The major contents of the article are summarized as follows:(1) The laying equipments and installation technics of S-lay method are systematically introduced, and the installation flow chart is also described. The comparative analysis between steep S-lay method and conventional S-lay method is conducted, and several S-lay projects in the deepwater sea are listed.(2) According to the catneary theory the static equilibrium of pipe section is established to analysize the S-lay configuration. The procedures about natural catenary method and stiffened catenary method are respectively developed to calculate total configuration and mechanical performance of the pipelines from the deck of the barge to the sea floor. The DNV-OS-F101 criterion is imported into the procedure to predict the ultimate laying depth.(3) The effects of a series of parameters such as sea depth, the diameter of pipe, pipe wall thickness, the maximum strain, initial angle of pipe, the radius of stinger, yield and ultimate strength of pipeline steel on pipe tension, laying configuration and limited laying depth are analized. The distributions of bending moment along the pipeline exist obvious distinctions for the different pipe-lay depth, however the distributon shapes of axial tension along the pipeline are almost similar.This research work is partly sponsored by the special subject of the National High Technology Research and Development Program of China ("863" program) with its title as "Technique of deepwater pipelaying". And it is an important part of the subject titled as "Investigation on Technological design and computational analysis for deepwater pipelaying" (Grant No. 2006AA09A105-1).

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CLC: > Transportation > Integrated transport > Pipeline transportation > Pipeline construction and mechanical
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