Analysis of the Main Interference Causes of Acoustoelectric Logging Detector

Abstract

Acoustic-type logging instruments generate high voltages in the order of thousands of volts. Electromagnetic interferences are thus induced by high-voltage pulses that affect the logging tool and make it inoperable owing to damaged components in severe cases. In particular, weak acoustoelectric signals, vulnerability to electro magnetic interference, and other characteristics require higher electro magnetic compatibility of the acoustoelectric logging detector. The system’s complexity makes it difficult to find and analyze the root cause of the interference. This paper revolves around the three elements of electromagnetic compatibility. The electrode measurement circuit is a sensitive source. Through interference analysis and testing, the high voltage pulse source is determined to be the source of interference. We focus on analyzing the formation mechanism of electromagnetic interference coupling paths. The electromagnetic interference characteristics of the detector are systematically analyzed and verified by combining the qualitative electric coupling mechanism, the quantitative Gaussian electric field law and the electric coupling experimental study. This paper reduces the main interference causes and characteristics of the detector and reveals that the electrical coupling of high voltage pulses is the main interference cause of the acoustoelectric logging detector. The method to eliminate the coupling path is proposed.

Keywords

• acoustoelectric logging
• logging tool
• high-voltage pulse
• electromagnetic interference
• electrical coupling