Online monitoring device for corrosion in pipeline

Abstract

The invention which relates to an online monitoring device for the corrosion in a pipeline belongs to the technical field of pipeline corrosion monitoring. The online monitoring device for the corrosion in the pipeline is characterized in that the monitoring device comprises a signal acquisition module, a signal transmission apparatus, an A / D converter, a datum analysis module, a datum management module and a computer; the signal acquisition module comprises a three-electrode monitoring probe, a signal generation control unit and a signal buffer memory unit, and the signal generation control unit applies electrochemical excitation and transmits feedback signals to the signal buffer memory unit; the signal transmission apparatus which is a wired or wireless transmission apparatus transmits datum signals to the A / D converter; and the datum signals which go through the datum analysis module and the datum management module enter the computer and are processed by the computer, and online monitoring is displayed. The monitoring device has the advantages of in situ lossless online monitoring, no need of frequent disassembly and assembly, wide suitable medium range, integration of monitoring, analysis and management, real-time detection and the like.

Description

technical field [0001] The invention belongs to the technical field of pipeline corrosion monitoring, and in particular relates to an on-line monitoring device for pipeline internal corrosion. Background technique [0002] At present, in the production process of oil and gas fields, in-service equipment and pipelines are always in a harsh working environment during use: the external environment is high temperature, high pressure, high flow rate and constantly changing; the internal environment has many strong corrosive media, a small amount of free water, acidic Components (such as carbon dioxide, hydrogen sulfide, etc.), salts, air oxygen components, and bacteria are all likely to cause internal corrosion of oil and gas pipelines. The internal and external environment jointly affect oil and gas pipelines, resulting in pipeline breakage, oil leakage, and even explosion accidents. Oil spills on platforms and pipeline explosions are directly or indirectly related to corrosion...

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Problems solved by technology

However, the coupon monitoring needs to be disassembled and assembled, the monitoring period is long, and the average corrosion rate in the test period can only be determined, and the local corrosion effect cannot be reproduced well; the resistance probe method is also not limited by the corrosive medium, and It is not necessary to take out the sample when measuring, which has the advantages of direct, continuous, fast and sensitive

However, this method has strict requirements on sample processing, and cannot measure local corrosion characteristics. It is used in non-uniform corrosion occasions, and the error is relatively large; linear polarization resistance method is a method that is very suitable for on-site corrosion monitoring. Fast response, can obtain uniform corrosion rate, relatively sensitive, can reflect changes in equipment operating conditions in time

However, it is highly dependent on aqueous solutions and is only suitable for corrosion monitoring of electrolyte solutions; the electrochemical noise method is the only method that can provide localized corrosion information, and its disadvantage is that it is more complicated than other methods and usually cannot obtain absolute information on corrosion rates

In short, there is currently a lack of a new electrochemical technology that can comprehensively monitor the internal corrosion of oil and gas pipelines.

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