Fault Diagnosis Method for Hydraulic End of Drilling Pump Valve Based on Harmonic Amplitude Summation of Pump Stroke Frequency

Aiming at the problem of fault diagnosis of valve assemblies in the hydraulic end of drilling pumps, a diagnosis methode based on the harmonic amplitude summation of pump stroke frequency was proposed. Initially, experiments were designed to investigate the components of vibration signals from the hydraulic end of the BW-250 type drilling pump. The low-frequency interference was removed using high-pass filters and the high-frequency impact of the valve components of pump valve was retained. Then the pump valve impact signals were then extracted and enhanced by using envelope analysis and maximum correlated kurtosis deconvolution techniques. Fault experiments were conducted on F-800 and F-1600HL drilling pumps in actual drilling sites. The sum of pump stroke frequency harmonic amplitudes was used as a diagnostic index and compared with other vibration indices. The results indicate that this method enables a 95.79% accuracy for fault diagnosis of drilling pump valve assemblies, which is more than 18% higher than that of the root mean square (RMS) index, and more than 10% higher than that of margin and kurtosis indices. The method provides an effective and viable solution for fault diagnosis in drilling pump valve assemblies.