Pressure-Balanced Acoustic Reception in Wellbores
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Solution Overview
Problem
Existing acoustic telemetry systems in wellbores face challenges in maintaining the quality of acoustic signal reception due to variations in pressure and contact forces, which can affect the accuracy and reliability of data transmission from tubular strings.
Innovation Solution
A pressure-balanced acoustic-signal-receiving apparatus with a tubular-contact assembly and acoustic-signal receiver, featuring a fluid chamber with pressure equilibration and a communication member, allows for independent contact forces and pressures to enhance signal reception and transmission, while minimizing noise and vibration interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the acoustic receiver is mounted directly on the tubular string, then the contact force is strong for signal reception, but the received signal quality deteriorates due to pressure variations and noise interference
Solution Approach 1:
The acoustic receiver is segmented from direct contact with the tubular string by introducing an intermediate fluid coupling mechanism. The receiver is positioned in a fluid-filled chamber that couples to the tubular string through a flexible membrane, separating the sensing element from the noisy mechanical environment while maintaining signal transmission through fluid pressure changes.
Solution Approach 2:
A flexible membrane serves as an intermediary between the tubular string and the acoustic receiver. This membrane transmits acoustic vibrations from the tubular wall to the fluid in the chamber while isolating the receiver from direct mechanical contact and associated noise. The fluid acts as a second intermediary, transmitting the vibrations to the receiver through pressure changes.
2Reliability
If the contact force between the receiver and tubular wall is increased, then the signal strength improves, but the noise and vibration interference increases
Solution Approach 1:
The direct mechanical contact system is replaced with a fluid-coupled acoustic sensing system. Instead of relying on mechanical pressure contact between the receiver and tubular wall, the system uses acoustic vibrations transmitted through the tubular wall to create pressure changes in the fluid chamber, which are then detected by the acoustic receiver. This substitution eliminates mechanical friction and vibration noise while maintaining signal detection capability.
3Measurement precision
If pressure equalization is implemented in the fluid chamber, then the signal reception accuracy improves, but the device complexity increases
Solution Approach 1:
The fluid chamber is designed with pressure equalization ports that allow the fluid pressure to equilibrate with the external environment. This creates an equipotential pressure condition throughout the chamber, eliminating pressure differentials that would distort acoustic signal measurements. The flexible membrane also contributes to pressure equalization by flexing to balance pressure differences between the chamber interior and exterior.
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 apparatus effectively receives and transmits acoustic signals with improved accuracy and reliability by maintaining balanced fluid pressures and contact forces, reducing noise interference and ensuring consistent data transmission from tubular strings.
Implementation Method 1
an acoustic-signal receiver coupled to the tubular-contact assembly and positioned within the isolating member
Implementation Method 2
equilibrating a fluid pressure in a first portion of the fluid chamber with a fluid pressure of a second portion of the fluid chamber
Data Source
AI summary
A pressure-balanced acoustic-signal-receiving apparatus and methods therefor. The apparatus may comprise a first housing, a first actuator, a second housing, and a second actuator. The first housing may comprise a fluid chamber, a passage connecting a first and second portion of the fluid chamber, a tubular-contact assembly, an isolating member within the fluid chamber and coupled to the assembly, an acoustic-signal receiver within the isolating member and coupled to the assembly, and a communication member coupled to the receiver. A method for receiving an acoustic signal generated within a wellbore may comprise receiving the acoustic signal with a tubular-contact assembly, sensing the acoustic signal with an acoustic-signal receiver positioned within a fluid chamber and coupled to the assembly, equilibrating fluid pressures in the first and second portions of the fluid chamber, and transmitting information generated by the acoustic-signal receiver through a communication member.