Multiphase flow multiphase visual corrosion test device and method

Abstract

The invention discloses a multiphase flow multiphase visual corrosion test device and method, and belongs to the technical field of gas transmission pipeline and equipment corrosion monitoring. The device is mainly composed of a corrosion inhibitor filling unit, a corrosion monitoring phase area, a high-speed camera, a flow pattern control unit, a flow pattern recognition unit and the like. By utilizing the device and the method, the corrosion rate monitoring and corrosion inhibitor film integrity damage evaluation can be carried out by changing the flow rate and the flow rate of each phase ofa multiphase flow corrosion medium. The method comprises: firstly, the flow pattern control unit changing the flow and flow velocity of each phase of a corrosive medium; obtaining a flow pattern to be monitored; the flow pattern recognition unit and the high-speed camera respectively indirectly measuring and directly recognizing the flow pattern of the corrosive medium, then realizing multi-phasecorrosion monitoring through the change of a plurality of mounting angles of the corrosion monitoring phase region, and the corrosion monitoring phase region being provided with the semitransparent visualization unit, so that the condition of the corrosive medium in the pipe can be observed.

Description

technical field [0001] The invention relates to a multiphase flow multiphase visualized corrosion test device and method, belonging to the technical field of corrosion monitoring of oil and gas gathering and transportation pipelines and equipment. [0002] technical background [0003] At present, my country's sulfur gas reservoirs are facing a relatively serious problem in the development process, that is, corrosion. Corrosion is a phenomenon in which metal materials are destroyed by chemical or electrochemical reactions with the surrounding environment. Corrosion problems are almost common in all walks of life. This problem exists in all industries, but it is particularly prominent in petroleum refining and chemical enterprises. Whether it is in the production oil and gas fields or the oil and gas fields that are being explored and developed, the maintenance of oil and gas pipelines will consume a lot of manpower, material resources, and financial resources. Therefore, effect...

AI Technical Summary

Problems solved by technology

When the multiphase flow corrosive medium flows in the pipeline, it will have a fluid scouring effect on the wall surface. The different flow rates, flow rates and flow patterns of each phase have obvious differences in the scouring effect on the pipe wall, thus destroying the integrity of the corrosion inhibitor film. There is also a significant difference

[0005] Invention patent CN107764727 discloses a rotatable corrosion coupon device, which generates vortex flow through the rotating wheel, and designs a pre-stretched π-shaped transmission rod to realize the tight connection of each transmission part and π-shaped corrosion coupon, changing the corrosion resistance of the corrosion coupon. The curved section improves the bending resistance of the coupons and avoids the bending and yielding phenomenon of the corrosion coupons due to the impact of the air flow; the invention patent CN105699279 discloses a high-pressure metal pipeline non-stop corrosion coupon monitoring device. The completed vertical piston rod is moved up to the apex, and then the horizontal piston rod of the horizontal hydraulic cylinder assembly is moved to the leftmost end, so that the ball valve device blocks the lower part of the vertical hole of the body, and the interface of the body is completely sealed and isolated from the middle of the vertical hole of the body. Remove the vertical liquid cylinder assembly and the corrosion coupon, and indirectly monitor the corrosion of the pipeline by observing the corrosion state of the corrosion coupon; Ming patent CN105823703 discloses a device and method for evaluating the integrity of the corrosion inhibitor film under scouring conditions, mainly By measuring the wall shear force of the fluid, the evaluation of the damage to the integrity of the corrosion inhibitor film is obtained. The above-mentioned device and method still have defects that need to be improved.

[0007] (1) The integrity damage evaluation and corrosion monitoring of the corrosion inhibitor film cannot be performed on the multiphase flow corrosive medium under the condition that the flow rate, flow rate and flow pattern of each phase are different

[0008] (2) The corrosion monitoring of the pipeline can only be carried out in a single phase, and the corrosion of the entire cross-section of the pipeline cannot be fully understood, and corrosion monitoring leaks will occur at the fluid accumulation and fluid washing out of the pipeline

[0009] (3) The corrosion monitoring method widely used in low-pressure oilfield pipelines is the corrosion coupon method, which cannot reflect the corrosion rate at a certain moment

[0010] (4) The corrosion monitoring device in the pipe affects the fluid flow, changes the flow field in the pipe, affects the conditions of the corrosion simulation in the pipe, and hinders the use of the pre-film pig

[0011] (5) Lack of visualization devices, it is difficult to observe phenomena such as liquid deposition and sulfur particle precipitation in the tube

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