论文部分内容阅读
为探究井下油管泄漏声波法检测技术及方法,开展油管泄漏室内试验。在分析油管泄漏声波产生机制的基础上,提出油管泄漏声波地面检测技术及其实施方式。搭建室内全尺寸油管泄漏检测系统,并进行一系列模拟试验;在时频域内分析试验采集的声波信号,结果表明,油管泄漏声波信号时域绝对均值(AMV)及有效值(RMS)特征随着泄漏孔径及压差的增加而增大;该信号是宽频信号,其能量主要集中在1~130 Hz;检测信号的时域特征AMV和RMS、频域分布特征、自相关分析主峰值等,可作为判断泄漏发生的特征量;利用自相关分析能实现单探头对井下油管泄漏的检测与定位,具有较高精度。
In order to explore the downhole tubing leakage sound wave detection techniques and methods, to carry out the pipeline leak indoor test. On the basis of analyzing the mechanism of acoustic leakage of tubing leakage, the acoustic ground detection technology of tubing leakage and its implementation are proposed. A full-scale indoor pipeline leak detection system was built and a series of simulation tests were carried out. The acoustic signals collected from the test were analyzed in the time-frequency domain. The results showed that the AMV and RMS values of acoustic leakage signals were The aperture and the pressure drop increase; The signal is a wide-band signal, its energy is mainly concentrated in the 1 ~ 130 Hz; detection signal time domain features AMV and RMS, frequency domain distribution characteristics, the main peak of the autocorrelation analysis, etc. As a feature to determine the occurrence of leakage; the use of autocorrelation analysis can detect and locate the single probe on the tubing leak in the downhole, with higher accuracy.