An experimental device for simulating fatigue damage of deep-water steel catenary risers touching the ground

Abstract

The invention provides an experimental device for simulating the fatigue damage of the ground contact section of a deep-water steel catenary riser, comprising: a main box body, a radial test seat for radially rotating the experimental pipeline, a slide rail group, and a load loading device; The high-pressure cabin is sealed and communicated with the main box, and a seabed soil box with an upper opening is placed inside, and a water inlet valve, a drain valve, and an exhaust valve are installed on the shell; one end of the experimental pipe is connected to the radial experimental seat , the other end is connected with the seabed soil box; the stress-strain acquisition instrument includes a force sensor, a strain sensor and a velocity sensor. The invention can simulate the fatigue damage of the ground contact section of the steel catenary riser in the deep water and high pressure environment, can carry out multi-degree-of-freedom cyclic load and displacement loading, can adjust the initial deflection of the experimental pipeline, and is used for analyzing various pipe laying methods. fatigue damage of steel catenary risers.

Description

technical field [0001] The invention relates to the field of petroleum engineering, in particular to a multi-degree-of-freedom cyclic load and displacement loading for simulating a deep-water steel catenary riser fatigue damage experimental device. Background technique [0002] Marine risers are used to connect floating platforms (such as FPSO, SPAR, etc.) Chainline risers are more and more used in the design of deepwater risers because of their economy and better adaptability to the movement of the upper platform. Steel catenary risers are more suitable than flexible risers, but face more fatigue problems in the suspension and touchdown areas. The fatigue life of the top of the steel catenary riser and the contact point are key factors in the design of the steel catenary riser. [0003] The fatigue damage at the top of the riser is mainly caused by waves, while the fatigue damage at the touchdown point is usually caused by the movement of the upper floating body and the i...

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Problems solved by technology

[0004] There is also a scheme for studying this problem in the prior art, such as the scheme of the publication number CN105004500A, which is called a steel catenary riser integral analysis test device considering the effect of pipe and soil, although it proposes a deep water riser fatigue test device , but its riser fatigue test device can only simulate the J-type pipe laying method, the angle of the riser top is fixed, and it cannot simulate the fatigue damage of the steel catenary riser laid by various pipe laying methods due to the coupling effect of pipe soil; the experimental process The load direction of the standpipe is single, and the fatigue damage data of the standpipe can only be measured in one direction; at the same time, because the initial bending moment and axial force need to be provided to make the standpipe model bend to the specified deflection, the installation process of the standpipe is complicated

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