A Monitoring/Identifying System for Tubing Conveyed Perforation
Zhou Xu-guo · Well Logging Technology · 2008
It is difficult for operator perforating in deep well,horizontal well,and some other complex conditions to identify perforating signal from vibration information acquired on well site since the noise interference.Introduced is a tubing conveyed perforation(TCP) monitoring/identifying system that can automatically identify explosion signal of perforating gun.The system extracts ignition time of the perforating gun from the vibration information with time domain analysis method;intensifies the useful signal with square process,weakens the noise with window function,removes the vibrating noise of pressuring pump with 50～300 Hz bandpass filter;then the correct ignition time of the perforating gun is got with selecting suitable threshold according to amplitudes of useful signal and noise.Several lab experiments and practical applications in fields show that the system meets the requirement of automatically identifying explosion signal down well.Some monitoring cases,such as pressured perforation with weak vibration in deep well,multi-stage ignition,pressure igniting,signal of end-sound shell,are presented.