Research On Submarine Oil And Gas Pipeline Leak Detection And Monitoring System Based On Wavelet Analysis

Submarine oil and gas pipelines are important transportation methods for offshore oil and gas transportation,but they are in a harsh marine environment for a long time.The probability of pipeline failure is high.It is difficult to detect and locate leaks when a leakage accident occurs during transportation,so the seabed is fast and accurate.The detection and monitoring of oil and gas pipeline leakage is of great significance for reducing economic losses and protecting the marine environment.This paper firstly studies the leakage detection of submarine oil and gas pipelines,establishes the basic equation of unsteady flow of submarine oil and gas pipelines,determines the pipeline leakage model,and establishes a pipeline leak detection experimental platform to study the characteristics of pressure changes inside the pipeline during leakage.The TGNET simulation software simulates the leakage of submarine pipelines,studies the variation law of the leakage point pressure when the pipeline leaks under different working conditions,and guides the installation of the pressure sensor.According to the leakage signal collected by the field experiment and the particularity of the seabed environment,the collected signals are found.It will be interfered by noise.Therefore,in order to remove the noise,this paper compares the traditional wavelet and the lifting wavelet.Finally,the lifting wavelet is introduced and the improved threshold algorithm is introduced to denoise the collected signal,and the optimal value is determined according to the signal-to-noise ratio.The wavelet basis and the optimal decomposition scale show that the noise reduction method of this paper is better than the traditional wavelet denoising method for the noise reduction of the field data.The influencing factors of the detection and location of the submarine pipeline leakage are studied,and the fluid flow rate and occurrence in the submarine pipeline are derived.Negative in the tube when leaking The propagation velocity of the wave and the law of pressure and temperature variation along the submarine pipeline are derived.A formula for calculating the flow velocity of the medium and the negative pressure wave velocity caused by the leakage of the submarine oil and gas pipeline is proposed.In the two aspects of software and software,a submarine pipeline leak detection and monitoring system was designed by using C++ language to complete the collection,transmission and processing of the field data and the location of the last leak hole.