Oscillating Counterweight Acoustic Source for Downhole Tools
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Solution Overview
Problem
Current downhole tools face challenges in effectively generating and propagating acoustic signals through subterranean formations to measure characteristics like porosity and shear slowness, as existing methods lack efficient mechanisms for signal generation and transmission.
Innovation Solution
The proposed solution involves a shell oscillated by a counterweight system, where springs oriented at different angles and an actuator compress the springs to move the counterweight, generating an acoustic signal through a fluid, allowing the shell to move relative to a support and propagate signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a downhole tool uses conventional acoustic signal generation methods, then the structure remains simple, but the acoustic signal generation efficiency and measurement capability are insufficient
Solution Approach 1:
The patent employs a counterweight oscillation mechanism where an actuator drives a counterweight to oscillate, which in turn oscillates the shell to generate acoustic signals. This mechanical vibration approach directly addresses the need for efficient acoustic signal generation while maintaining a manageable structural complexity through the use of standard mechanical components.
Solution Approach 2:
The patent utilizes a counterweight disposed within the shell that is oscillated by an actuator. The counterweight's motion creates reactive forces that drive the shell to oscillate, generating acoustic signals. This counterweight mechanism provides an effective means of signal generation while distributing mechanical stresses within the structure.
2Productivity
If the shell is rigidly fixed to the downhole tool, then structural stability is high, but acoustic signal propagation capability is reduced
Solution Approach 1:
The patent employs a movable coupling between the shell and the downhole tool support, allowing the shell to oscillate dynamically relative to the support. This dynamic coupling enables the shell to move freely enough to generate and propagate acoustic signals effectively, while the support structure maintains overall structural stability when needed.
Solution Approach 2:
The patent separates the shell from the main downhole tool body through a movable coupling mechanism, allowing independent motion of the shell. This segmentation enables the shell to oscillate and generate acoustic signals without being constrained by the rigid structure of the main tool, while the tool itself remains stable.
3Productivity
If springs are oriented at the same angle, then the structure is symmetric and simple, but the counterweight oscillation efficiency is reduced
Solution Approach 1:
The patent employs springs oriented at different angles to the longitudinal axis of the shell, creating an asymmetric configuration. This asymmetric spring arrangement optimizes the oscillation mechanics of the counterweight, allowing for more efficient generation of acoustic signals. The different angles enable better distribution of forces and improved oscillation dynamics compared to a symmetric arrangement.
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 enhances the movement of the shell relative to the downhole tool, generating a dipole acoustic signal that effectively traverses the formation, enabling accurate measurement of subterranean characteristics.
Implementation Method 1
a first spring is coupled to the shell and a first end of the counterweight, and a second spring is coupled to the shell and a second end of the counterweight
Implementation Method 2
an actuator coupled to the first spring or the second spring. The actuator is to oscillate the counterweight to enable the shell to provide an acoustic signal
Data Source
AI summary
An apparatus disclosed herein includes a shell movably coupled to a base. The shell defines a chamber, and a counterweight is disposed in the chamber. A first spring is coupled to the shell and a first end of the counterweight, and a second spring is coupled to the shell and a second end of the counterweight. The first spring is oriented at a first angle, and the second spring is oriented at a second angle different than the first angle. The example apparatus further includes an actuator coupled to the first spring or the second spring. The actuator is to oscillate the counterweight to enable the shell to provide an acoustic signal.