Research on long-distance monitoring of oil theft in buried pipeline

To avoid drilling hole and stealing oil in pipeline, a method of monitoring man made damage in advance is offered based on low frequency vibration signal. The signals come from the complex activities such as welding, hammering and damaging metallic pipe. Spectral analysis and wavelet packet decomposition are used to extract feature information from gathered signal. The test distance between sensor and damage site is extended to 2.4 km, 7.4 km and even 13 km much longer than before. The results show that the method is effective when sensor spacing is 2.4 to 3.0 km, and instrumentation system can guarantee the security of oil pipeline and alarm in time.