Polishing Rod Anchor for Pumpjack Seal Maintenance
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Solution Overview
Problem
Mechanical lifts used in petroleum extraction face issues with corrosion and deformation of the polishing rod due to oscillations through the wellhead, leading to reduced efficiency and operational losses as the rod interacts with external and internal environments, necessitating a method to maintain the rod's integrity without halting the extraction process.
Innovation Solution
An anchor system with radial and transverse hinges, clamps, and abrasive materials is employed to abrade and maintain the polishing rod's surface, utilizing its oscillations to prevent corrosion and deformation while maintaining a seal, allowing continuous operation without stopping the mechanical lift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the polishing rod oscillates through the wellhead during mechanical lift operation, then the rod is exposed to corrosive environments and mechanical wear, but this causes corrosion, rust, and deformation of the rod surface
Solution Approach 1:
The system uses the rod's own oscillation motion to drive the polishing mechanism. The abrasive element is positioned to contact the rod surface, and the rod's movement through the wellhead automatically performs the polishing action without requiring external power or intervention, making the system self-servicing
Solution Approach 2:
The harmful oscillation motion that causes corrosion is converted into a beneficial polishing action. The abrasive element utilizes the rod's natural back-and-forth movement to remove corrosive deposits and maintain surface integrity, transforming the harmful mechanical stress into a protective maintenance mechanism
2Reliability
If the polishing rod surface becomes corroded and deformed, then the rod's structural integrity deteriorates, but this increases energy consumption and reduces well output
Solution Approach 1:
The abrasive element continuously maintains the rod surface by removing corrosive deposits before they can significantly degrade performance. This preliminary maintenance action prevents the accumulation of roughness and corrosion that would otherwise increase friction and energy requirements during operation
3Productivity
If the rod oscillates through the wellhead environment, then mechanical extraction continues, but the seal between the rod and wellhead deteriorates due to corrosion and deformation
Solution Approach 1:
The system automatically maintains the sealing surface through the rod's own operational motion. The abrasive element continuously polishes the rod surface as it oscillates, ensuring the seal contact surface remains smooth and intact without requiring separate maintenance operations that would interrupt extraction
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 anchor system effectively prevents corrosion and deformation of the polishing rod, ensuring a smooth operation, reducing friction, and maintaining the seal, thus enhancing the mechanical lift's efficiency and extending its operational lifecycle.
Implementation Method 1
An anchor system with radial and transverse hinges, clamps, and abrasive materials is employed to abrade and maintain the polishing rod's surface
Data Source
AI summary
An anchor preserves the seal on an oscillating polishing rod in a pumpjack. The anchor has first and second sidewalls. The sidewalls are joined and oriented in opposite directions to create a cylindrical sidewall for the anchor. The cylindrical sidewall extends about a longitudinal axis and is coupled to a radial hinge that is substantially parallel to the longitudinal axis. The radial hinge couples the first sidewall relative to the second sidewall and facilitates the opening and closing of the cylindrical sidewall to create a clamping area in the locked position. A transverse hinge extends in an orthogonal direction relative to the radial hinge. The transverse hinge supports a rotating shaft on the exterior surface of the sidewall. A clasp on the opposite end of the shaft selectively and optionally locks the first sidewall relative to the second sidewall to create the clamping area of the anchor.