Pipeline inner wall detection system and method

Abstract

A pipeline inner wall detection system and method provided in embodiments of the present invention relate to the technical field of pipeline inner wall detection. The method comprises that the vector network analyzer device outputs microwaves and transmits the microwaves to the coaxial feeding end cover device; the coaxial feeding end cover device transmits the received microwaves into the pipeline to be tested, and when there is a When thinning, receive the echo signal reflected back by the thinning part of the inner wall of the pipe to be tested in the microwave; then the coaxial feeding end cover device will also transmit the received echo signal to the vector network analyzer device; the vector network The analyzer device also processes the echo signals to obtain thinning information at the thinning of the inner wall of the pipe under test. The wave impedance changes at the thinned part of the inner wall of the pipeline to be tested through microwaves, resulting in impedance mismatch, which causes the microwave to reflect at the thinned part in the time domain, and then processes the reflected echo signal to obtain the measured Thinning information at the thinning of the inner wall of the pipe. Improve detection accuracy.

Description

technical field [0001] The invention relates to the technical field of pipeline inner wall detection, in particular to a pipeline inner wall detection system and method. Background technique [0002] Pipeline transportation has a history of more than 150 years. It is widely used in industrial production and daily life. Oil and natural gas resources are mainly transported by buried pipelines (usually low alloy steel). During the operation of oil and gas pipelines, internal corrosion will lead to the thinning of the inner wall of the pipeline. The root cause is that the transport medium contains H2S, CO2 and other substances. First, H2S chemically reacts with carbon steel pipes, and hydrogen as one of the products can cause hydrogen damage to the pipes, while the other product, FeS, is usually a defective structure, which has poor adhesion to the steel surface and is prone to corrosion. It will fall off and act as a cathode to form an active micro-battery with the steel subst...

AI Technical Summary

Problems solved by technology

If the local thinning problem in the pipeline cannot be found and dealt with in time, it will cause serious consequences such as damage to equipment and pipelines, leakage of transported materials leading to combustion or explosion, environmental pollution, production shutdown, and casualties

At present, there is no better solution to realize the detection of the inner wall of the pipeline

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