Downhole Acoustic Isolator for Tool Length Reduction
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Solution Overview
Problem
Conventional downhole acoustic sensing systems are lengthy and costly due to the placement of electronics outside the emitter and sensors, and they suffer from significant self-generated noise due to conducted acoustic signals, which interfere with substrate signal detection.
Innovation Solution
The system places electronics closer together and incorporates an acoustic isolator with a spacer ring to separate the transmitter and receiver, using materials with different sound speeds to attenuate conducted signals and improve data quality by filtering out self-generated noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronics are placed outside the emitter and sensors, then the system has better signal detection capability, but the tool length increases and cost increases
Solution Approach 1:
The patent combines the electronics with the emitter and sensors within the same collar section, integrating components that were previously separated. This merging reduces the overall tool length while maintaining signal detection capability through careful placement and isolation strategies.
Solution Approach 2:
The electronics are nested within the collar section that also contains the emitter and sensors, creating a compact integrated unit. This nesting approach allows multiple components to occupy overlapping spatial volumes, reducing the overall tool length without compromising functional performance.
2Measurement precision
If electronics are placed outside the emitter and sensors, then the system has better signal detection capability, but the manufacturing cost increases
Solution Approach 1:
By merging the electronics with the emitter and sensors into a single collar section, the patent reduces the number of separate components and assembly steps. This integration simplifies the manufacturing process and reduces overall system cost while preserving signal detection capabilities.
Solution Approach 2:
The collar section serves multiple functions: it houses the emitter, sensors, and electronics simultaneously, while also providing structural support and signal isolation. This multi-functionality reduces the need for separate specialized components, thereby lowering manufacturing costs.
3Object-generated harmful factors
If transmitter and receiver are separated by a large distance, then self-generated noise is reduced, but the tool length increases
Solution Approach 1:
The patent introduces an acoustic isolator as an intermediary component between the transmitter and receiver. This isolator uses materials with different sound speeds to attenuate conducted acoustic signals, effectively reducing self-generated noise while keeping the physical separation distance short.
Solution Approach 2:
The acoustic isolator employs composite materials with specifically selected acoustic properties, including materials with different sound speeds, to create a noise-filtering barrier. This composite structure enables effective noise attenuation within a compact space, avoiding the need for long tool length.
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 design results in a shorter, more cost-effective system that enhances signal differentiation between conducted and reflected signals, leading to improved data quality and reduced interference, thereby better characterizing the subterranean substrate.
Implementation Method 1
incorporates an acoustic isolator with a spacer ring to separate the transmitter and receiver, using materials with different sound speeds to attenuate conducted signals
Data Source
AI summary
Aspects of the subject technology relate to downhole sensing system are disclosed. The system has a first collar configured to accept a receiver, a second collar configured to accept a transmitter; and an acoustic isolator disposed between the first collar and the second collar. The acoustic isolator has a tubular body with a generally smooth exterior surface and an interior surface with a plurality of circumferential grooves formed in the interior surface that modify the acoustic impedance of the tubular body, thereby attenuating an acoustic signal passing through the tubular body.