Fluidic Agitator Asymmetric Flow Path Vibration Control
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Solution Overview
Problem
Existing downhole tools face challenges in efficiently controlling fluid flow and generating vibrations to navigate drill strings through curved and angled wellbores without increasing the size of the fluidic agitator, while maintaining a range of frequency and strength in pressure pulses.
Innovation Solution
A tool assembly with an insert comprising an inlet chamber, a vortex chamber, and a feedback chamber, featuring an asymmetric flow path and switch based on the Coanda effect, which alternates fluid flow between different channels to create a pressure profile with multiple levels and frequencies, allowing for stronger and lower-frequency vibrations without enlarging the agitator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the size of the fluidic agitator is increased to generate stronger vibrations, then the vibration strength increases, but the device complexity and size increase
Solution Approach 1:
The patent employs asymmetric flow paths within the fluidic agitator chambers, where the inlet, vortex, and feedback chambers are configured with non-uniform geometries and flow restrictions. This asymmetry creates unbalanced pressure distributions that generate stronger vibrational forces without requiring proportional increases in chamber volumes, thus achieving enhanced vibration strength while maintaining compact dimensions.
Solution Approach 2:
The fluidic agitator utilizes dynamic flow switching between different chambers through controllable flow paths. The system dynamically alternates fluid flow between inlet chambers, vortex chambers, and feedback chambers, creating time-varying pressure oscillations that generate effective vibrations. This dynamic operation allows the system to achieve high vibration strength through rapid pressure cycling rather than static large-volume chambers.
2Speed
If the frequency range is extended to include lower frequencies, then the vibration effectiveness improves, but the device complexity increases
Solution Approach 1:
The fluidic agitator is divided into multiple independent chambers including inlet chambers, vortex chambers, and feedback chambers, each with specific flow paths. This segmentation allows different chambers to operate at different flow rates and pressure levels, enabling the system to generate a broad frequency range including lower frequencies. Each chamber segment can be optimized independently, managing complexity through modular design.
Solution Approach 2:
The patent incorporates feedback chambers that receive fluid flow from vortex chambers and return it to inlet chambers, creating closed-loop flow paths. These feedback loops introduce phase delays and pressure oscillations that generate lower frequency vibrations. The feedback mechanism allows the system to extend its frequency range downward without proportionally increasing overall device complexity, as the feedback paths reuse existing chamber structures.
3Adaptability or versatility
If multiple pressure levels are generated, then the fluid control capability improves, but the manufacturing precision requirements increase
Solution Approach 1:
Different chambers within the fluidic agitator are designed with locally optimized geometries and flow restrictions tailored to their specific functions. Inlet chambers have different configurations than vortex chambers, which differ from feedback chambers. This local quality approach allows each chamber to contribute to multiple pressure levels through its specific flow characteristics, achieving versatile fluid control without requiring extreme precision across the entire device. Each chamber's local optimization compensates for variations in other areas.
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 tool assembly effectively reduces friction and facilitates the passage of drill strings through rock formations by generating vibrations with a greater range of strength and frequency, enhancing fluid control and delivery efficiency in downhole operations.
Implementation Method 1
switch based on the Coanda effect, which alternates fluid flow between different channels
Implementation Method 2
vortex chamber, and a feedback chamber. The inlet chamber is in fluid connection with the inlet of the housing, and the vortex chamber has an output in fluid connection to the outlet of the housing
Data Source
AI summary
The tool assembly vibrates a casing string or drill string in a wellbore. The tool assembly includes a housing, an insert mounted in the housing as a fluidic agitator, and a cover fitted over the insert. The insert includes an inlet chamber, a vortex chamber, and a feedback chamber, and the fluid flow through the insert has a pressure profile with a plurality of levels determined by the feedback chamber. The strength and frequency of the pressure profile can be regulated by the feedback chamber according to position, size and asymmetry of the transition channels connected to the feedback chamber. The high strength and low frequency pressure pulses can be achieved in the limited space of the housing for placement of the inlet and outlet.