Non-linear static analysis method for deep-sea slow-wave umbilical cables

Abstract

The invention relates to a non-linear static analysis method for deep-sea slow-wave umbilical cables, which includes the following steps: (Step 1) theoretical assumption; (Step 2) creation of a mechanical analysis model: Because of the thin and long characteristic of an umbilical cable, the configuration of the umbilical cable is described with the position of the central axis of an umbilical cable pipeline according to a classical theory, divided into a spanning section and a touchdown section; (Step 3) setting of boundary conditions: The umbilical cable is connected to surface floating devices through bend limiters, the connection is simplified as articulated connection, and thereby the boundary condition of a layout point (LOP) is determined; and taking the diameter influence of the umbilical cable into account, the boundary condition of a touchdown point (TDP) is determined; (Step 4) numerical solvent: Once top tension T0 is determined, the configuration of each differentiation element is worked out sequentially from the top by the recurrence method, and thereby the overall slow-wave configuration of the umbilical cable is obtained. The non-linear static analysis method can effectively implement analysis on deep-sea slow-wave umbilical cables. In the process of solvent, the top tension T0, spanning section length and touchdown point location of the umbilical cable are unknown, only the top layout angle Theta 0 is a known parameter, and numerical solvent needs to be carried out by iterative operation; once the top tension T0 is determined, the configuration of each differentiation element is worked out sequentially from the top by the recurrence method, and thereby the overall slow-wave configuration of the umbilical cable is obtained.

Description

technical field [0001] The invention relates to a nonlinear static analysis method of deep-sea slow-wave umbilical cord. Background technique [0002] In deep-sea oil and gas exploitation projects, umbilical cables, as an important part of the underwater production system, play an important role in connecting surface floating devices and subsea oil wells, and are the lifeline of the offshore oil and gas underwater production system. As the offshore oil and gas exploration project continues to advance to the deep sea, the tension on the top of the umbilical cable continues to increase due to the increase in water depth. In order to avoid excessive tension at the top of the deepwater umbilical cable, the slow wave configuration is widely used in deepwater oil and gas development due to its characteristic of effectively reducing the top tension. However, the introduction of the buoyancy block system in the slow-wave configuration makes its nonlinear characteristics more and mo...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency that the prior art cannot effectively analyze deep-water slow-wave umbilicals, the present invention provides a nonlinear static analysis method for deep-sea slow-wave umbilicals that can effectively analyze deep-water slow-wave umbilicals

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