Zero Backlash Coupling Key for MWD Pulse Generator
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Solution Overview
Problem
Current mud pulse telemetry systems in drilling operations face challenges such as mechanical wear, incompatibility with air/underbalanced drilling, limited speed of response, and degradation due to gas presence in drilling fluid, which affect signal quality and reliability.
Innovation Solution
A fluid pressure pulse generator with a stator and rotor design that allows for adjustable flow configurations, including full, intermediate, and reduced flow modes, using a rotor with spoon-shaped depressions and flow channels to optimize fluid flow and minimize pressure losses, and a coupling key with zero backlash rings for secure driveline coupling, enabling robust and adaptable pressure pulse generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotor and stator design with flow configurations is used to generate pressure pulses, then signal quality and reliability are improved, but device complexity increases
Solution Approach 1:
The flow path is segmented into multiple configurations (full flow, intermediate flow, reduced flow) by dividing the stator into different flow chambers and the rotor into corresponding flow passages. This segmentation allows selective activation of different flow paths to generate distinct pressure pulse signals, improving signal reliability while maintaining a modular structure that manages complexity.
Solution Approach 2:
The system dynamically switches between different flow configurations (full, intermediate, reduced) based on operational requirements. The rotor can be positioned to align with different stator chambers, dynamically changing the flow path and pressure pulse characteristics. This dynamic adaptability improves signal reliability under varying conditions without requiring multiple static systems.
2Adaptability or versatility
If multiple flow configurations are implemented in the pulse generator, then adaptability to varying fluid conditions is improved, but manufacturing complexity increases
Solution Approach 1:
The rotor and stator assembly serves multiple functions: it can operate in full flow mode, intermediate flow mode, and reduced flow mode using the same basic components. The universal design allows a single pulse generator to adapt to varying fluid conditions (different viscosities, flow rates, gas contents) by simply repositioning the rotor relative to the stator chambers, eliminating the need for multiple specialized components and simplifying manufacturing.
Solution Approach 2:
The system changes operational parameters (flow area, flow path length) by repositioning the rotor to align with different stator chambers. This parameter adjustment allows the same physical components to adapt to varying fluid conditions without manufacturing different components, thereby improving adaptability while maintaining ease of manufacture.
3Reliability
If a coupling key with zero backlash rings is used for driveline coupling, then mechanical wear is reduced, but device complexity increases
Solution Approach 1:
The traditional mechanical coupling with potential backlash is replaced by a coupling key incorporating zero backlash rings that eliminate play between the driveline and pulse generator. This substitution uses a specialized coupling mechanism with elastic or adjustable components that maintain constant mechanical contact, reducing wear and improving reliability while adding only a single integrated coupling component rather than multiple separate parts.
Solution Approach 2:
The coupling key incorporates zero backlash rings made from elastic materials or composite structures that combine rigidity with flexibility. These composite components provide both the structural strength needed for driveline coupling and the elastic properties necessary to eliminate backlash, achieving mechanical durability without excessive complexity.
4Measurement precision
If continuous monitoring and calibration capabilities are integrated into the pulse generator, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system integrates sensors that continuously monitor pressure pulse generation and provide feedback to a control mechanism. This feedback loop enables real-time detection of signal quality and automatic adjustment of rotor position or flow configuration to maintain optimal measurement precision. The feedback mechanism uses simple comparative sensing rather than complex analysis, improving precision while managing complexity.
Solution Approach 2:
The pulse generator incorporates self-calibration capabilities where the system automatically adjusts its own operation based on monitored parameters. The device performs self-diagnostics and self-correction without external intervention, maintaining measurement precision through autonomous operation. This self-service approach eliminates the need for external calibration equipment and reduces overall system complexity.
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 provides reliable and efficient pressure pulse generation across varying fluid flow conditions, reducing mechanical wear and signal degradation, and allowing for continuous operation even with damaged components, while eliminating the need for skilled technicians for setup and maintenance.
Implementation Method 1
Pressure pulses are generated by changing the flow area and/or flow path of the drilling mud as it passes the MWD tool in a timed, coded sequence, thereby creating pressure differentials in the drilling mud
Implementation Method 2
The at least one zero backlash ring extends around the key body and protrudes from surfaces of the key body and into the gap such that an interference fit is established between the coupling key, the keyhole, and the receptacle when the coupling key is coupling the driveshaft and rotating component together
Data Source
AI summary
A coupling key for fixedly coupling a driveshaft to a rotating component of a measurement while drilling telemetry apparatus comprises a key body and at least one zero backlash ring. The key body has dimensions selected to fit within a keyhole of a driveshaft and a receptacle of a rotating component, with a gap that is large enough that the key body can be freely inserted into the keyhole and receptacle and small enough that the coupling body can couple the driveshaft to the rotating component in a rotational direction. The least one zero backlash ring extends around the key body and protrudes from surfaces of the key body and into the gap such that an interference fit is established between the coupling key, the keyhole, and the receptacle when the coupling key is coupling the driveshaft and rotating component together.