Downlinking System Using Pressure Wave Modulator for Drilling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current downlinking methods in drilling operations face challenges such as erosion due to high fluid velocities, slow data transmission speeds, and equipment wear, particularly when using bypass valves or pulsers within the drilling fluid supply line, which limit control over drilling parameters and data acquisition.
Innovation Solution
A downlinking system using a pressure wave modulator disposed outside the drilling fluid supply line, with a rotatable flap inside the line to generate continuous combinatorial frequencies, enabling fast and robust communication by varying the amplitude of pressure wave signals without obstructing the fluid flow, thus maintaining optimal pumping pressures and reducing equipment wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a bypass valve is used to transmit downlink signals through negative pressure pulses, then data transmission can be achieved, but fluid velocity increases causing erosion and valve failure
Solution Approach 1:
The invention extracts the signaling function from the bypass valve system and relocates it to the drilling fluid pump. The pump varies drilling fluid flow rate directly to encode downlink signals, eliminating the need for bypass valves and the harmful high-velocity fluid discharge that causes erosion.
Solution Approach 2:
The invention replaces the mechanical bypass valve system with a pump-based flow rate modulation system. Instead of using mechanical valves to create pressure pulses, the system uses controlled variations in pump output flow rate to encode transmission signals, eliminating mechanical wear and erosion problems.
2Loss of information
If a pulser is disposed inside the drilling fluid supply line to generate downlink signals, then signal transmission is achieved, but the flow area is significantly obscured requiring higher pumping pressure
Solution Approach 1:
The invention removes the pulser device from inside the drilling fluid supply line and replaces it with pump-based flow rate control. This eliminates the flow area obstruction problem while maintaining signal transmission capability through flow rate modulation.
Solution Approach 2:
The invention uses the drilling fluid pump as an intermediary device to achieve signal transmission. Instead of placing a pulser inside the line that obstructs flow, the pump itself modulates the flow rate to encode signals, avoiding flow area obscuration while maintaining adequate pumping pressure.
3Loss of information
If drilling flow rate is manipulated for downlinking communications, then data transmission can be achieved, but transmission speed becomes extremely slow limiting control capability
Solution Approach 1:
The invention uses periodic modulation of drilling fluid flow rate at varying frequencies to encode downlink signals. By using different frequency patterns and combinatorial codes, the system achieves faster transmission speeds while maintaining reliable signal detection, overcoming the slowness of traditional single-frequency pulse methods.
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 system achieves fast and reliable downlinking communication, optimizing data acquisition and management for rotary steerable systems, with improved resistance to erosion and reduced wear on pumping equipment, enabling more precise control over drilling operations.
Implementation Method 1
generating encoded pressure fluctuations in the drilling fluid flowing through the surface-located fluid line by changing a flow area within the surface-located fluid line
Data Source
AI summary
Exemplary embodiments are directed to a system and method for continuous downlinking communication from a surface location to a bottom hole assembly during drilling operations. The system transmits harmonic pressure wave fluctuations generated by a modulator, which is disposed outside of a surface-located fluid line with a flap rotatably disposed entirely inside of the fluid line encoding data by harmonics. One letter of the combinatorial frequencies signal alphabet can have more than 200 different orthogonal frequencies components; each component represents a unique combination of downlinking command purpose and value. For deepest portion of a long trajectory well, the system uses a narrow frequency range (2-3 Hz) with two letters resulting in more than 250 combinations. The system provides continuous automatic downhole control of the signal-to-noise ratio to achieve robust decoding of downlinking signals with a transmission data rate ten times faster as compared to 1-2 bits per minute in the industry.