Dual-Transducer Acoustic Sensor for Backside Wave Interference Control
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Solution Overview
Problem
Piezoelectric acoustic sensors used in oilfield services face challenges with signal attenuation and self-induced acoustic interference in high-density downhole fluid environments, leading to reduced accuracy and consistency due to decreased signal-to-noise ratio (SNR).
Innovation Solution
The implementation of a dual-transducer acoustic sensor system with a primary and secondary piezoelectric transducer, where the secondary transducer is used to monitor and measure reverberation characteristics, filter or cancel internal interference by generating calibration signals and determining transfer functions to correct for backside acoustic waves, thereby enhancing signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single piezoelectric transducer is used for acoustic measurement, then the device complexity is low, but self-induced acoustic interference degrades measurement precision
Solution Approach 1:
The single transducer is segmented into two functional components: a primary piezoelectric transducer for generating and detecting acoustic signals, and a secondary piezoelectric transducer specifically for monitoring backside acoustic waves. This segmentation allows independent optimization of each transducer's function, enabling interference cancellation while maintaining manageable device complexity
Solution Approach 2:
The secondary piezoelectric transducer acts as an intermediary sensor that specifically detects the harmful backside acoustic waves. By introducing this intermediary monitoring element, the system can identify and cancel self-induced interference without requiring fundamental changes to the primary measurement mechanism
2Adaptability or versatility
If acoustic signals are transmitted through high-density downhole fluid, then the sensor can operate in challenging environments, but signal attenuation reduces measurement precision
Solution Approach 1:
The system implements feedback by using the secondary transducer to continuously monitor backside acoustic wave interference and feeding this information back to the signal processing system. This feedback loop enables real-time cancellation of interference signals, maintaining measurement precision even when operating in high-density downhole fluid environments where attenuation is severe
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes self-induced interference and improves the accuracy and consistency of acoustic signal measurements by actively canceling backside acoustic waves, maintaining a higher signal-to-noise ratio in challenging downhole environments.
Implementation Method 1
acoustic sensors that employ piezoelectric transducers are used for various measurement and imaging operations
Implementation Method 2
Acoustic signals such as ultrasonic signals generated by piezoelectric transducers may be substantially attenuated when propagating through drilling mud or other downhole wellbore substances
Data Source
AI summary
Methods, systems and devices are disclosed for controlling self-induced acoustic interference. In one embodiment, a first piezoelectric transducer to which a first excitation signal is applied, generates back side acoustic waves that are transmitted from a back side of the first piezoelectric transducer into a backing material layer. A second piezoelectric transducer coupled to a back side of the backing material layer generates a first calibration response to the back side acoustic waves. An interference signal profile is generated based, at least in part, on the first calibration response and may be used to filter interference signal components and/or to generate a control signal to be applied to the second piezoelectric transducer during measurement cycles.