Microleakage locating algorithm of gas gathering pipeline based on whitening filter

Abstract

The extraction and identification of microleakage signal caused by the corrosion of gathering pipelines in the oil and gas fields is a great technical challenge for leakage monitoring. Therefore, a microleakage locating algorithm of gas gathering pipeline based on whitening filter was proposed for the microleakage signal submerged in the pipeline.noise As the acquired signal of gathering pipeline contains an abundance of low-frequency components, tracking with the adaptive whitening filter can eliminate the low-frequency components, so that the power spectrum of the acquired signal becomes flat and close to the white noise. The microleakage signal processed by whitening filter is enhanced, and the signal-to-noise ratio (SNR) is increased by nearly 4 dB. At the same time, the cross-correlation operation with the signals processed by whitening filter can calculate the time delay of signals at both ends of pipline, futher locate the microleakage point of gathering pipeline by leakage positioning formula. According to the calculation results, the algorithm can accurately locate the microleakage signal of the oil and gas field gathering pipeline, with error of 2 m. Thus, demonstration application should be provided for various media at different pressure levels under different topographic conditions, so as to improve the locating accuracy of the algorithm, further providing technical support for the construction of no-leakage demonstration area.

Keywords

• gas gathering pipeline
• leakage signal
• pipeline noise
• whitening filter
• microleakage locating