Downhole Vibration Acquisition Method based on Compressed Sensing Technology

Abstract

The high-frequency measurement of downhole vibration signal is vital for the analyses of abnormal vibration signal in the process of drilling. In this work, an acquisition method of downhole vibration high-frequency measurement signal based on compressed sensing technology is proposed. Moreover, the establishment method of sparse dictionary and observation matrix is studied in-depth, and an OMP algorithm against spectrum leakage is proposed. The performance of the proposed method has been investigated via simulations by varying the applied signals over 100 times. The result demonstrated that the proposed approach captures the high-frequency signal at the equivalent sampling rate of 390 MS/s by utilizing a low-speed ADCs with a sampling rate of 65 MS/s and a pseudo random binary sequence. This method provides a new way to acquire the high-frequency measurement data of downhole vibration, and provides favorable data support for mastering the comprehensive law of downhole vibration and diagnosing downhole abnormal vibration.