Experimental study on ground detection of gas well down-hole tubing leak based on acoustic method

doi:10.16265/j.cnki.issn1003-3033.2017.02.022

Abstract

Abstract: In order to research the method of leak detection for down-hole tubing based on acoustic method, experiments were conducted after designing and setting up the full-size tubing leak system. On the basis of analyzing leak acoustic waves generating mechanism of tubing strings, a ground detection mechanism and an implementation way were presented. The signals measured in the experiments were analyzed in time and frequency domain. The results indicates that the time domain characteristics AMV and RMS of leaking acoustic wave signals are increasing with the increase in both orifice diameter and pressure difference,that the frequency domain distribution of leak acoustic waves is widely and mainly centralized in 1-130 Hz,that the main peak value of auto-correlation coefficients as well as the ASL and RMS characteristics and the frequency domain distribution of detecting signals can be used to judge the occurrence of leakage,and that using auto-correlation analysis the detection and localization of down-hole tubing leakage can be achieved with a high accuracy.

Key words: down-hole tubing, leakage acoustic waves, auto-correlation analysis, characteristic frequency, absolute mean value (AMV), root mean square (RMS)

CLC Number:

X924.2

LIU Di , FAN Jianchun , LIANG Zhengwei , ZHANG Ximing , LYU Ningyi , WEN Min. Experimental study on ground detection of gas well down-hole tubing leak based on acoustic method[J]. China Safety Science Journal, 2017, 27(2): 121-126.

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