Dual Rotor Pulser for Mud Pulse Telemetry
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Solution Overview
Problem
Existing rotary pulsers in mud pulse telemetry systems have limited flexibility in operating modes and are prone to plugging, which affects data transmission quality and reliability during drilling operations.
Innovation Solution
A dual rotor pulser system where two independently controlled rotors create pressure pulses in the drilling fluid by rotating relative to each other, allowing for various operating modes, including continuous and oscillatory rotation, and includes clearing modes to prevent plugging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single rotor pulser is used, then the device complexity is reduced, but the adaptability and flexibility in operating modes are limited
Solution Approach 1:
The pulser device is segmented into two independent rotor assemblies, each capable of rotating in different directions and at different speeds. This segmentation allows the system to achieve multiple operating modes (continuous rotation, oscillatory rotation, reverse rotation) without requiring a completely different device structure for each mode, thus improving adaptability while keeping each individual rotor assembly relatively simple.
Solution Approach 2:
The dual rotor configuration provides multi-functionality by enabling the same pulser device to operate in multiple modes: continuous rotation for standard data transmission, oscillatory rotation for enhanced signal generation, and reverse rotation for clearing debris. This universal design allows a single device to perform various functions that would otherwise require multiple specialized devices.
2Reliability
If drilling mud pressure is increased to prevent well control issues, then well safety is improved, but the likelihood of plugging in the pulser increases
Solution Approach 1:
The pulser employs dynamic rotation of the rotor assemblies, where the rotors can rotate in different directions and at variable speeds. This dynamic operation prevents debris and drilling mud from settling and accumulating in fixed positions, thereby reducing plugging tendency even under high drilling mud pressure conditions. The continuous motion creates fluid dynamics that keep the passageways clear.
Solution Approach 2:
The oscillatory rotation mode creates periodic motion in the rotor assemblies, which generates pulsating flow patterns in the drilling mud. This periodic action helps to periodically clear debris from the passageways, preventing plugging while allowing the system to operate under high pressure conditions required for well control.
3Measurement precision
If high frequency pressure pulses are generated for better data transmission, then data quality is improved, but the energy consumption increases
Solution Approach 1:
The two rotor assemblies are driven by a single motor assembly that can rotate both rotors simultaneously. By merging the drive function into one motor, the energy consumption is reduced compared to using separate motors for each rotor, while still achieving high frequency pressure pulses through the coordinated rotation of both rotors in the same or opposite directions.
Solution Approach 2:
The oscillatory rotation of the rotor assemblies generates mechanical vibrations in the drilling fluid, creating high frequency pressure pulses. This mechanical vibration approach allows for efficient energy transfer to the fluid, generating the required high frequency signals for improved data transmission quality without excessive energy consumption from the motor.
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 dual rotor pulser system provides flexibility in data transmission modes and reduces the likelihood of plugging, enhancing data quality and reliability by allowing for real-time adjustments in operating conditions and effective debris clearance.
Implementation Method 1
rotation of one or both of the rotors relative to the other rotor creates pressure pulses in the drilling fluid
Data Source
AI summary
A rotary pulser for transmitting information in a mud pulse telemetry system of a drilling operation. The pulser has two rotors mounted adjacent each other so that obstruction of the passages formed between the blades in one pulser by the blades of the other pulser creates pressure pulses in the drilling fluid. Each rotor is separately controlled and can be rotated continuously in one direction or oscillated. The ability to rotate each rotor separately provides flexibility in the pulser's operating mode, so as to allow more efficient generation of pulses, and also enhances the ability of the pulser to clear debris that would otherwise jam or obstruct the pulser.