Air-Gapped Ultrasonic Transducer Housing for Wellbore Noise Blocking
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Solution Overview
Problem
Existing ultrasonic transducers in wellbore operations suffer from noise interference due to undesirable ultrasonic wave propagation and reception through the housing, which degrades the signal-to-noise ratio and affects the quality of imaging and other wellbore operations.
Innovation Solution
The use of an air-gapped ultrasonic transducer design, featuring an inner and outer housing separated by an air gap, which blocks undesirable ultrasonic waves from exiting or entering the housing, combined with a backing material to attenuate rearward waves and a cover to protect the piezoelectric element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ultrasonic waves are transmitted through the housing of the transducer, then the transducer structure is simple and compact, but noise interference increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The transducer housing is segmented into an inner housing containing the piezoelectric element and an outer housing, separated by an air gap. This segmentation prevents ultrasonic waves from propagating through the housing walls, thereby reducing noise interference while maintaining a compact overall structure.
Solution Approach 2:
An air gap is introduced as an intermediary medium between the inner and outer housing. This air gap acts as an acoustic barrier that blocks undesirable ultrasonic waves from exiting or entering the housing through the sides or rear, significantly reducing noise interference.
2Object-affected harmful factors
If ultrasonic waves can exit through the rear wall of the housing, then the transducer design is simpler, but rearward waves cause noise when reflected back
Solution Approach 1:
The housing is divided into inner and outer sections with an air gap, creating a segmented structure that specifically blocks rearward-propagating ultrasonic waves from exiting through the rear wall, preventing their reflection back into the piezoelectric element as noise.
Solution Approach 2:
The air gap extracts or removes the harmful rearward wave propagation path by introducing a medium that blocks ultrasonic wave transmission, thereby eliminating the source of reflected noise while maintaining the essential transducer structure.
3Object-affected harmful factors
If side walls of the housing transmit ultrasonic waves, then manufacturing is easier, but side-transmitted waves create noise interference
Solution Approach 1:
The housing structure is segmented with an air gap between inner and outer walls, preventing ultrasonic waves from transmitting through the side walls. This segmentation effectively blocks side-transmitted waves that would otherwise create noise interference.
Solution Approach 2:
The air gap serves as an intermediary acoustic barrier between the inner and outer housing walls, blocking the transmission of ultrasonic waves through the side walls and eliminating the associated noise interference.
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
The air-gapped design significantly reduces noise, achieving a high signal-to-noise ratio of 20-30 decibels, enabling effective wellbore imaging and other operations by ensuring ultrasonic waves are transmitted and received only through the front of the transducer.
Implementation Method 1
an air gap between an inner housing and an outer housing of the transducer. The air gap blocks undesirable ultrasonic waves from exiting or entering the housing
Implementation Method 2
a piezoelectric element mounted in a space within the inner housing
Implementation Method 3
The backing material attenuates ultrasonic waves traveling rearward through the piezoelectric element
Data Source
AI summary
An ultrasonic transducer for use in a downhole wellbore environment is disclosed. The ultrasonic transducer can utilize a piezoelectric element located in a housing comprising an inner housing and an outer housing separated by an air gap. The air gap functions to block undesirable ultrasonic waves from exiting or being received by the ultrasonic receiver and resulting in signal noise. For example, the air gap can prevent ultrasonic waves generated by the piezoelectric element from exiting the housing through a side or rear thereof, and can prevent reflected ultrasonic waves from being received by the ultrasonic transducer through a side or rear of the housing. The air gap may contain a gas or a fluid, or the air gap may be evacuated. The ultrasonic transducer may be a component of a downhole tool, such as a logging-while-drilling tool, or a post-drilling operation tool, such as a wireline tool.