Experimental device for comprehensive testing of marine pipeline mechanical properties

Abstract

The invention relates to an experimental device for comprehensive testing of marine pipeline mechanical properties, wherein the experimental device includes a tension and compression testing device, a four-point bending testing device, an external pressure testing device, an internal pressure testing device and a groove type base; the tension and compression testing device includes two groups of tension and compression testing components oppositely arranged on the groove type base, and the tension and compression testing components are used for achieving a clamping action and a tension and compression action on a test pipe; the four-point bending testing device adopts a four-point bending principle and is used for achieving the four point bending effect on the test pipe; the external pressure testing device is used for applying external hydraulic pressure to the periphery of the test pipe; the internal pressure testing device is used for applying internal hydraulic pressure to the inner periphery of the test pipe. The four sets of testing sub-devices have no direct relation and can be arbitrarily combined with other testing sub-devices, so that the arbitrary combination of tension, compression, bending, internal and external pressures can be realized, the shortcoming of single testing contents of a traditional experimental device is improved, the experimental device is more diverse in experimental forms, powerful in functions and complete in performance.

Description

technical field [0001] The invention relates to an experimental device for testing the performance of pipe fittings, in particular to an experimental device for comprehensively testing the mechanical properties of marine pipelines. Background technique [0002] Ocean pipelines include subsea oil and gas gathering and transportation pipelines, trunk pipelines, and risers connecting pipelines and platforms. Or transport to onshore oil and gas storage stations. The transportation process of the offshore pipeline is the same as that of the land pipeline, but because the offshore pipeline project is carried out in the sea, the engineering construction method is different from the land pipeline project. With the continuous exploration and transportation of offshore oil and gas resources, the demand for offshore pipelines is also increasing. Ocean pipelines are the most important transportation mode for offshore oil and gas exploitation. The safety of their installation process an...

AI Technical Summary

Problems solved by technology

[0003] The shortcomings of the experimental device for testing the mechanical properties of pipe fittings in the prior art are: 1. When carrying out different experiments, it is usually necessary to make different experimental devices, which increases the complexity of the experiment and increases the cost of the experiment

2. The requirements for the experimental objects are strict, and only some specific experimental objects can be measured. When some parameters of the experimental objects are changed, the experimental device cannot match

3. The experimental device is bulky, difficult to assemble and disassemble, and it is difficult to meet the sealing requirements when performing pressure experiments

4. The entire pipeline is placed in a hyperbaric chamber for experiments. When the experimental pipeline is large, the volume of the hyperbaric chamber required is too large, which increases the cost of the experiment

[0004] At present, there are a large number of comprehensive experimental devices for tension-compression bending in China: Chinese patent document 201310656728.5 proposes an online testing method for oil pipes under the combined load mode of tension-compression bending. And control the stress and extrusion of the tubing, but the experiment needs to install the tubing in a device that loads the tubing to simulate the actual working environment of the tubing, which makes the experiment more complicated; Chinese patent document 201020650215.5 proposes a simulation experiment of coiled tubing downhole mechanical behavior The device is used to simulate the deformation and release process of the coiled tubing in the oil and casing under the injection and extraction state, and to test and simulate the axial load at both ends of the coiled tubing in real time. The experimental content is single, and multiple experimental combinations cannot be carried out; China Patent document 201620360238.X proposes an experimental device applied to the study of the mechanical behavior of pipe strings. The experiment integrates different load loading and testing mechanisms such as tension, compression, bending, torsion, etc., but the experiment cannot simulate the internal and external pressure pair experiments in actual working conditions. influences

[0005] At present, there is no experimental device at home and abroad for the random combination of internal and external pressure, tension, compression and bending experiments on pipe fittings. Therefore, it is very necessary to design and provide a simple and accurate multifunctional pipe fitting performance test experimental device.

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