Submarine pipeline damage analysis method

Abstract

The invention discloses a submarine pipeline damage analysis method. The method comprises the following steps: initializing parameters; obtaining a critical impact speed vs and a penetration depth ds through numerical simulation; establishing a Johnson damage number and a penetration depth rate index eta based on the parameters; fitting a damage analysis curve through parameter points, dividing a boundary of each penetration mode, and quantifying to form a unified damage grade; giving out the damage degree and maintenance suggestion evaluation of each grade; finally, obtaining the position relation of the parameter points of the next accident on the damage analysis curve, and obtaining a damage conclusion directly. According to the method, the complexity of selecting a large number of index systems in traditional analysis is avoided, various penetration modes can be evaluated more macroscopically, the impact damage evaluation of the submarine pipeline can be quickly obtained, and the method has the characteristics of convenience, universality, quickness and the like.

Description

technical field [0001] The invention belongs to the field of marine engineering protection, and in particular relates to a damage analysis method for a submarine pipeline. Background technique [0002] As the main equipment of the national marine fossil resource industry, submarine pipelines are widely used in the process of offshore oil and natural gas extraction and transportation. After the submarine pipeline is subjected to the impact load of falling anchor, it is very easy to cause the problem of sag, rupture and penetration, which poses a threat to the service of the submarine pipeline. As an indispensable and important link in the operation process of submarine pipelines, damage analysis can provide the evaluation of the damage degree and damage state of submarine pipeline penetration. However, there is no perfect analysis method for penetration damage of submarine pipelines, so domestic and foreign codes have not yet provided clear guidance on penetration maintenanc...

AI Technical Summary

Problems solved by technology

Although relevant progress has been made in the penetration theory and damage law of hydraulic-filled pipelines, there are still some deficiencies: (1) At present, empirical or semi-empirical formulas are mainly used to obtain penetration damage data of submarine pipelines. It usually comes from some specific damage accidents and is limited to the migration and application of penetration damage data; (2) due to the lack of damage evaluation indicators suitable for engineering applications, it is still impossible to accurately describe the degree and form of pipeline penetration damage; (3) due to the lack of damage evaluation indicators suitable for engineering applications; The complexity of the influence of parameters and the existence of multiple penetration modes make it difficult for the penetration damage analysis method of submarine pipelines to represent different failure modes, and a unified damage analysis level has not been formed

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