Combined loading buckling test method for submarine pipeline under complex load

Abstract

The invention relates to a bending test method capable of realizing complicated load combined loading of a submarine pipeline. A device comprises a main cabin body (5), lateral hydraulic rod devices d, a front end flange (13), a first set of rear end flange (11) and threaded circular cylinder (9) assembly and a second set of rear end flange (11) and threaded circular cylinder (9) assembly, wherein the lateral hydraulic rod devices d are used for applying bending moment to a test pipe fitting (12); threads of the two sets of rear end flange (11) and threaded circular cylinder (9) assemblies are mutually matched; a thread matched with the front end flange (13) is formed in the inwards convex position of the front end of the main cabin body (5); a thread and a thread pitch of the rear end flange (11) are the same as those of the front end flange, and the first set of rear end flange (11) and threaded circular cylinder (9) assembly represents a type I; a thread pitch of the second set of rear end flange (11) and threaded circular cylinder (9) assembly is different from that the front end flange, the difference of the thread pitches is determined according to experimental requirements, and the second set of rear end flange (11) and threaded circular cylinder (9) assembly represents a type II. According to the method, simulation of a real work environment of the full-size submarine pipeline in laying and service periods can be realized, and a bending test for complicated load combined loading is performed.

Description

technical field [0001] The invention relates to a complex load combined loading buckling test method for a deep-water submarine pipeline, which can realize the joint action of axial tension, bending moment and torque load on a full-scale submarine pipeline. Background technique [0002] Energy security and the core competitiveness of the world economy are increasingly dependent on the utilization and development of marine resources. However, my country's offshore oil and gas exploration and development technology still has a large gap compared with the world's advanced level. It is necessary to accelerate the technological innovation of deep-sea oil and gas development and enter the "deep-sea era". The strategy of marine power has gradually risen to the national will. [0003] Among them, the design and construction of deep-sea oil pipelines and related technologies are the key to the development of deep-sea oil and gas resources. The safe operation of oil pipelines is an i...

AI Technical Summary

Problems solved by technology

[0005] 1. The external loads that can be simulated by deep-water pressure chambers at home and abroad are single, mainly due to the influence of axial tension or bending moment under the action of water pressure on the mechanical properties of submarine pipelines, and it is impossible to realize the partial load of full-scale pipelines under the joint action of multiple loads. Stability test

[0006] 2. The bending moment loading method can only fix the pipe fittings according to the bending moment before applying water pressure, put the fixing parts in the pressure chamber for testing, and cannot change the bending moment value during the test

[0007] 3. Torque load is an important factor that must be considered in pipe laying operations and oil pipelines. There are few torque tests for full-size pipe fittings at home and abroad.

[0008] There is a test device in China (such as patent application number: CN201110008538), which pioneered the test of a full-scale pipeline in China, but it is only a single application of external loads, and cannot realize the joint action of multiple loads

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