Oscillating Shear Valve for Mud Pulse Telemetry
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Solution Overview
Problem
Current drilling fluid telemetry systems face limitations in data transmission rate due to high power consumption, pulse distortion, and mechanical wear, particularly in high-pressure and high-temperature downhole environments, where existing mud pulse valves struggle to efficiently transmit data without causing excessive wear and failure.
Innovation Solution
The implementation of a rotary pulser assembly with an oscillating rotor and stator configuration that obstructs fluid flow in a sinusoidal manner, using a motor-driven rotor with obstructing elements to generate pressure pulses efficiently, reducing wear and power consumption while enabling higher data transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing mud pulse valves are used to increase data transmission rate, then data transmission rate is improved, but power consumption becomes unacceptably large
Solution Approach 1:
The patent employs periodic oscillation of the rotor at controlled frequencies to generate pressure pulses for data transmission. By using oscillatory motion rather than continuous high-speed actuation, the system achieves higher data rates while maintaining acceptable power consumption levels through rhythmic, energy-efficient cycling of the valve elements.
Solution Approach 2:
The invention utilizes the hydraulic properties of the drilling fluid itself to transmit data through pressure pulses generated by the oscillating rotor. The fluid's natural compressibility and flow characteristics are leveraged to create detectable pressure variations without requiring high-power mechanical actuators, thus improving data transmission while controlling power consumption.
2Productivity
If existing mud pulse valves operate at high speeds to increase data rate, then data transmission rate is improved, but pulse distortion occurs
Solution Approach 1:
The oscillating rotor operates at controlled periodic frequencies that generate smooth, regular pressure pulses. This periodic motion avoids the high-speed transient effects that cause pulse distortion in conventional valves, maintaining signal integrity while achieving higher data transmission rates through optimized oscillation frequencies.
Solution Approach 2:
The system uses controlled mechanical oscillation of the rotor to generate pressure pulses rather than abrupt opening/closing actions. This vibratory motion creates smoother pressure transitions that reduce distortion, allowing for higher frequency modulation and improved data transmission rate without sacrificing pulse quality.
3Productivity
If negative pulsing valves are used to generate pressure pulses, then data transmission is achieved, but mechanical and abrasive wear increases
Solution Approach 1:
Instead of using negative pulsing that creates high differential pressures causing wear, the invention employs positive pulsing where the rotor oscillates to create pressure pulses in the direction of flow. This inverted approach eliminates the high-stress closing actions against valve seats, dramatically reducing mechanical and abrasive wear while maintaining data transmission capability.
Solution Approach 2:
The system uses the hydraulic flow of drilling fluid to generate pressure pulses through the oscillating rotor rather than relying on high-force mechanical valve closure. This hydraulic approach reduces mechanical contact and wear, improving reliability while maintaining the ability to transmit data through pressure variations.
4Measurement precision
If high differential pressure is applied below negative pulse valves, then sufficient pressure drop is created for telemetry, but washing and erosion increase
Solution Approach 1:
The invention inverts the negative pulsing concept to positive pulsing, where pressure pulses are generated by the oscillating rotor moving with the flow rather than against it. This eliminates the need for high differential pressures below the valve, reducing washing and erosion while maintaining sufficient pressure drop for accurate telemetry measurements through optimized rotor oscillation.
Solution Approach 2:
The system changes the operational parameters from high differential pressure static conditions to dynamic oscillatory conditions. By varying the rotor oscillation frequency and amplitude, the system achieves the necessary pressure drop for telemetry without requiring excessively high static differential pressures, thereby reducing erosive effects.
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 solution enhances data transmission efficiency, reduces mechanical wear, and maintains system reliability by minimizing power consumption and torque instability, allowing for more effective and durable operation in harsh drilling conditions.
Implementation Method 1
The implementation of a rotary pulser assembly with an oscillating rotor and stator configuration that obstructs fluid flow in a sinusoidal manner
Implementation Method 2
using a motor-driven rotor with obstructing elements to generate pressure pulses efficiently
Data Source
AI summary
Methods and systems for generating pulses in drilling fluid are described. The methods include driving rotation of a rotor relative to a stator of a pulser assembly in an oscillatory manner. The oscillatory manner includes rotating an obstructing element from a middle position to a first blocking angle position and rotating the obstructing element from the first blocking angle position to a second blocking angle position such that selective obstruction occurs. Rotation of the at least one obstructing element selectively obstructs a stator flow passage when drilling fluid is flowing through the drill string to generate a pressure pulse in the drilling fluid and the oscillatory manner is an oscillation of the obstructing element between the first blocking angle position and the second blocking angle position such that a single oscillation is between two obstructed states of the stator flow passage.