Fluidic Oscillator Vortex Chamber for Drill String Friction Reduction
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Solution Overview
Problem
In deep well and horizontal well operations, frictional forces between the drill string and the borehole wall or casing hinder the advancement of the drill string due to gravitational forces, buckling, and debris, leading to reduced weight-on-bit and impaired drilling efficiency.
Innovation Solution
A variable flow resistance device utilizing a fluidic oscillator with a vortex chamber and feedback control circuit to generate low-frequency, high-amplitude backpressure waves, reducing frictional resistance and enhancing fluid pulsation at the bit end, which is durable, reliable, and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a variable flow resistance device with moving parts or elastomeric components is used to generate backpressure waves, then the device complexity and reliability are improved, but the device becomes susceptible to wear, failure, and chemical degradation in harsh downhole environments
Solution Approach 1:
The patent replaces mechanical moving parts and elastomeric components with a purely fluidic oscillator system. The backpressure waves are generated through fluid dynamic interactions within the oscillator chamber, eliminating mechanical wear and chemical degradation issues associated with traditional valve-based systems.
Solution Approach 2:
The invention uses hydraulic principles to generate backpressure waves through fluid flow control. The fluidic oscillator utilizes the incoming fluid stream itself to create oscillating flow patterns and pressure waves, converting continuous fluid flow into pulsating backpressure without mechanical components.
2Productivity
If high-frequency backpressure waves are generated to reduce frictional resistance, then the productivity is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The fluidic oscillator is self-activating and self-regulating, using the incoming fluid stream's own momentum and pressure to generate oscillations. The system automatically adjusts its operation based on flow conditions without external control, eliminating the need for additional energy input or complex control systems.
Solution Approach 2:
The device generates periodic backpressure waves through natural fluid oscillation in the oscillator chamber. The alternating flow patterns create cyclical pressure variations that reduce frictional resistance and improve drilling efficiency without requiring continuous high-energy input.
3Force
If a variable flow resistance device is deployed to reduce frictional forces, then the weight-on-bit is improved, but the device complexity and potential failure points increase
Solution Approach 1:
The invention extracts the essential function of backpressure generation from complex mechanical valve systems and implements it through a simplified fluidic oscillator. By removing unnecessary mechanical components while retaining the core functionality of generating oscillating backpressure, the device reduces complexity and failure points.
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 device effectively reduces frictional resistance and enhances drilling efficiency by creating cyclical backpressure and pulsed fluid jets, allowing for better advancement of the drill string in challenging environments without moving parts or elastomeric components.
Implementation Method 1
a vortex chamber and a feedback control circuit to slow the frequency of the pressure waves
Implementation Method 2
The flow path includes a vortex chamber and a feedback control circuit to slow the frequency of the pressure waves
Implementation Method 3
enhancing fluid pulsation at the bit end
Data Source
AI summary
A vortex-controlled variable flow resistance device ideal for use in a backpressure tool for advancing drill string in extended reach downhole operations, especially in horizontal wells. The shape, frequency and duration of the pressure waves generated by the device are controlled by the growth and decay of vortices in the vortex chamber(s) of a flow path. The flow path includes a switch, such as a bi-stable fluidic switch, for reversing the direction of the flow in the vortex chamber. The flow path may include multiple vortex chambers, and the device may include multiple flow paths, through which flow may be parallel or sequential. This device generates backpressures of short duration and slower frequencies approaching the resonant frequency of the drill string, which maximizes axial motion in the drill string and weight on the bit. Additionally, fluid pulses produced by the tool enhance debris removal ahead of the bit.