Deep sea steel catenary vertical pipe touchdown point power response analyzing method

Abstract

The invention relates to a deep sea steel catenary vertical pipe touchdown point power response analyzing method. The method includes: simulating a steel catenary vertical pipe a large-deflection camber beam model, using the movement of a floating platform as the top end boundary condition of the vertical pipe, using a P-y curve method to numerically simulate the mutual effect, including linear elasticity rigidity when a seabed does not deform, the suction force effect when the vertical pipe leaves the seabed and nonlinear rigidity in a reciprocation effect, of the steel catenary vertical pipe and the seabed, building the mutual effect model of the steel catenary vertical pipe and the seabed, combining the mutual effect model with the movement equation of the floating platform and the simulating module of the steel catenary vertical pipe, and applying the combined model to the steel catenary vertical pipe touchdown point power response analyzing. The method has the advantages the existing methods simulating the seabed into a linear elastic spring or a rigid seabed are modified, the mutual effect of the steel catenary vertical pipe and the seabed can be accurately simulated, and calculation precision of steel catenary vertical pipe touchdown point power response analyzing is increased.

Description

technical field [0001] The invention belongs to the research technology of a steel catenary riser of a deep-sea oil and gas platform, and in particular relates to a method for analyzing the dynamic response of a deep-sea steel catenary riser touch point. Background technique [0002] The steel catenary riser is a new riser system for deep-sea oil and gas development. The first steel catenary riser was officially used in the development of deep-sea oil and gas resources in 1996. It is technically and economically superior to the traditional flexible riser and top tension The riser system has made great progress and has become the preferred riser system for the development of deep sea oil and gas resources. [0003] One end of the steel catenary riser is connected to the floating platform and hangs freely to the seabed, forming the shape of a catenary. The first point where the steel catenary riser contacts the seabed is called the touchdown point, and the section from the pl...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the existing dynamic response analysis method of the steel catenary riser touch point does not consider the influence of the large deflection of the steel catenary riser on the stiffness of the riser, does not consider the non-linearity of the support reaction force of the seabed soil, and does not consider The constraint effect of the seabed soil suction on the streamline section of the steel catenary riser, the continuous distributed seabed soil constraint force is simplified into a concentrated constraint reaction force, and the continuous distributed mass system is simplified into a concentrated mass system

Therefore, the accuracy of the analysis results obtained is not high enough, and there is a certain gap with the actual situation of the project.

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