Abstract

During the reeling process of the reel-lay method, the pipe will be subjected to combined loading of tension and bending. Excessive ovalization of the pipe will affect the structural performance and even lead to structural instability of the pipe. In this paper, a numerical simulation model of the pipe-reeling process is established by finite element tools. The Ramberg–Osgood material model is used to study the ovalization and bending moment of the pipe cross-section during the pipe-reeling process based on the Von Mises plasticity and nonlinear kinematic hardening rules. The results show that the ovalization and bending moment of the pipe section will change significantly during the pipe-reeling process. Subsequently, one set of 6-inch pipe-reeling experimental setups was designed to conduct a full-scale experiment. Compared with the experimental results, the feasibility of the finite element model is verified. Finally, the effects of diameter-to-thickness ratio, the material parameters of the pipe, and the pipe axial tension on the ovalization and bending moment changes are studied. Research shows that each parameter has a certain influence on the pipe of the reeling process, and the diameter-to-thickness ratio of the pipe has the most obvious effect. When the diameter-to-thickness ratio decreases, the bearing capacity for bending moments and the ability to resist ovalization of pipe are enhanced. At the same time, each parameter has a significant impact on the reeling process of the pipeline.

Highlights

  • As a new submarine pipeline-laying method, the reel-lay method is increasingly used in offshore oil and gas development projects

  • The Ramberg–Osgood material model is used in the finite element model, and the Von Mises plasticity and nonlinear kinematic hardening rules are used to study the changes in the ovalization and bending moment of the pipe cross-section during the reeling process

  • Ovalization change the measured the exdistribution of the axial stress component of the inner surface of the pipe that there is a periment is smaller than the simulated value, but the bending moment value measured in periment is smaller than the simulated value, but the bending moment value measured in decrease of stress at the center position

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Summary

Introduction

As a new submarine pipeline-laying method, the reel-lay method is increasingly used in offshore oil and gas development projects. The pipe is being reeled along the plane of the inner diameter of the reel In this process, the pipe deformation will ngradually change from an elastic to elastic-plastic state. The Ramberg–Osgood material model is used in the finite element model, and the Von Mises plasticity and nonlinear kinematic hardening rules are used to study the changes in the ovalization and bending moment of the pipe cross-section during the reeling process. The influence of the pipe diameter-to-thickness ratio D/t, yield stress, and hardening index on the change of ovalization and bending moment in the process of pipe reeling is studied. The influence of the pipe diam of 18 eter-to-thickness ratio D/t, yield stress, and hardening index on the change of ovalization and bending moment in the process of pipe reeling is studied

Experiments
Experimental Procedure
Pipeline Stress Analysis
Geometric
Pipeline
The part of theispipe and thestress compressive as shown in Figure
FEM Simulation
Material Model
Boundary Conditions
12. Bending
Figures and
Influencing Factors of the Reeling Process
15. Effect
Effect of Yield Strength
Effect
16. Effect
Effect of 16a
Effect of Axial
Conclusions
Full Text
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