Natural gas pipeline safety monitoring sound velocity compensation technology based on resampling algorithm

Abstract

The invention relates to a natural gas pipeline safety monitoring sound velocity compensation technology based on a resampling algorithm and belongs to the field of natural gas pipeline online safety monitoring. The natural gas pipeline safety monitoring sound velocity compensation technology based on the resampling algorithm comprises the processes that firstly, original reference signals collected by a multifunctional data acquisition card and detection signals collected by the multifunctional data acquisition card are transmitted to an upper computer for data processing, and meanwhile, the environment temperature at the moment is recorded when the original reference signals and the detection signals are collected; then, all the detection signals undergone matched filtering treatment are re-sampled and unified with the reference signals; and finally, envelope extraction and envelope subtraction are conducted on the re-sampled reference signals and detection signals, and then accurate locating of hydrate blockage and pipeline leakage of the natural gas pipeline can be achieved. The main advantages of the natural gas pipeline safety monitoring sound velocity compensation technology based on the resampling algorithm are that by means of the sound velocity compensation technology based on the resampling algorithm, noise interference and locating errors caused by sound velocity change can be effectively eliminated, and accurate locating of hydrate blockage and pipeline leakage can be achieved.

Description

technical field [0001] The invention relates to a sound velocity compensation technology for natural gas pipeline safety monitoring based on a resampling algorithm, and belongs to the field of online safety monitoring of natural gas pipelines. Background technique [0002] During the extraction, processing and gathering of natural gas, when the temperature and pressure meet certain conditions, natural gas hydrates are easy to form, which may interfere with the normal production and transportation of natural gas, or cause serious safety accidents. In addition, natural gas pipeline leakage accidents will also cause serious loss of life and property. Therefore, the monitoring and precise location of natural gas hydrate blockage and pipeline leakage are of great significance to the safe operation of pipelines. [0003] At present, the industry has carried out a series of studies on the safety monitoring of natural gas pipelines and published corresponding results. As the press...

AI Technical Summary

Problems solved by technology

However, in reality, the temperature is usually not constant, and the speed of sound will also change accordingly.

Therefore, reflection peaks caused by normal pipeline events such as bends, valves, etc. appear at different positions of the reference signal and the detection signal, resulting in additional noise in the envelope subtraction result

If the change in sound velocity is ignored, the reflection peaks caused by hydrate blockage and pipeline leakage will also drift, resulting in serious positioning errors

Images