Sucker Rod Guide With Hemispherical Wheels
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Solution Overview
Problem
Existing sucker rod guides fail to effectively reduce friction and wear between the rod string and production tubing in deviated wellbores, lack structural integrity for high load applications, and cannot centralize or rotate the rod string efficiently, leading to premature maintenance and wear.
Innovation Solution
A sucker rod guide with an elongate cylindrical body and multiple axially spaced, angularly offset hemispherical wheels that provide multiple rolling planes, allowing for centralization and rotation of the rod string, while maintaining structural integrity and reducing friction through a radial clearance and extensive contact surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If narrow wheels are used to reduce device complexity, then the structure is simpler, but the wheel bearing load on small contact surface causes quick wear and fatigue
Solution Approach 1:
The patent employs spherical rollers instead of narrow wheels. The spherical geometry provides a larger contact surface area with the tubing wall, distributing the load more effectively. This curvature-based solution maintains structural simplicity while significantly improving wear resistance and reducing fatigue in high deviation wells.
Solution Approach 2:
The patent changes the contact surface area parameter by using spherical rollers with optimized diameter. This parameter change allows the rollers to bear load over a larger surface, reducing contact stress and wear rate, thereby improving reliability without substantially increasing device complexity.
2Ease of operation
If axially-extending diametric slots are formed in the cylindrical body to mount wheels, then wheel mounting is enabled, but the structure is weakened creating fracture points
Solution Approach 1:
The patent uses spherical rollers that can be mounted on the cylindrical body without requiring deep axially-extending diametric slots. The spherical geometry allows for alternative mounting configurations that preserve the structural integrity of the cylindrical body while still enabling wheel mounting functionality.
Solution Approach 2:
The patent extracts the wheel mounting function from the cylindrical body structure itself, using separate mounting mechanisms that do not compromise the body's strength. This separation allows the cylindrical body to maintain its structural integrity while still supporting the rolling elements.
3Device complexity
If single wheel configuration is used to reduce device complexity, then the device is simpler, but the rod string cannot be rotated efficiently to shift load bearing area
Solution Approach 1:
The patent combines multiple spherical rollers into a single integrated rod guide device. This merging of multiple rolling elements allows the rod string to rotate efficiently by shifting the load bearing area among the spherical rollers, providing adaptability while maintaining relatively simple device structure.
Solution Approach 2:
The spherical rollers are configured to perform multiple functions: they reduce friction through rolling contact, enable rod string rotation by distributing load across multiple contact points, and adapt to different wellbore deviations. This multi-functionality provides rotation capability without substantially increasing device 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 solution significantly reduces friction and wear, enhances structural integrity for high load applications, and enables efficient navigation through deviated wellbores by centralizing and rotating the rod string, thereby extending the operational lifespan of the rod string and tubing.
Implementation Method 1
A sucker rod guide with an elongate cylindrical body and multiple axially spaced, angularly offset hemispherical wheels that provide multiple rolling planes, allowing for centralization and rotation of the rod string, while maintaining structural integrity and reducing friction through a radial clearance and extensive contact surface area.
Implementation Method 2
The solution significantly reduces friction and wear, enhances structural integrity for high load applications, and enables efficient navigation through deviated wellbores by centralizing and rotating the rod string, thereby extending the operational lifespan of the rod string and tubing.
Data Source
AI summary
A rod guide is provided for use on a rod string extending through a bore of a wellbore tubular. The rod guide has an elongate, generally cylindrical body configured to be connected in-line with a rod string, and a plurality of wheels rotatably fastened to the outside of the cylindrical body and configured to roll along the wellbore tubular. The plurality of wheels are angularly offset from each other to provide multiple rolling planes upon which the rod guide my roll, and can be arranged in series or in opposing pairs. The wheels also assist in centralizing the rod guide in the wellbore tubular. When arranged in a helical pattern, the wheels also facilitate rotation of the rod string.