Rod Coating Stripper With Cutting Bar And Deflector
Solution Overview
Problem
The existing methods for removing coatings from coated sucker rods, particularly those used in oil well production, are inefficient and do not effectively restore the integrity of the coating after repairs, leading to increased wear and corrosion near the pin ends, which reduces the service life of the rods.
Innovation Solution
A rod coating stripper apparatus comprising a frame with guiding rollers and a cutting bar to remove the coating in a controlled manner, allowing for the deflection of the remaining coating, which can be attached to a rod transfer unit for efficient stripping of coatings from coated rods, either on a mobile unit or directly at the well site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods for removing coatings from sucker rods are used, then coating removal is achieved, but the rod's integrity is compromised and wear increases
Solution Approach 1:
The coating removal process is segmented into controlled stages: the cutting bar removes coating in specific segments rather than completely stripping it, and the deflector peels away remaining coating in controlled portions. This segmentation allows coating removal while preserving rod integrity and enabling subsequent re-coating of pin ends.
Solution Approach 2:
The apparatus applies local quality by selectively removing coating only where needed (at the pin ends) while leaving the majority of the rod coating intact. The cutting bar and deflector work together to remove coating locally at the rod ends, preserving the protective coating on the main rod body.
2Ease of repair
If coating is completely removed from rod pin ends, then re-coating can be applied, but wear and corrosion increase during the process
Solution Approach 1:
The apparatus performs preliminary action by preparing the pin ends for re-coating through controlled coating removal, then immediately applies new coating material. The cutting bar and deflector prepare the surface, and the coating applicator follows immediately to prevent exposure of bare metal to wear and corrosion.
Solution Approach 2:
The process maintains continuity by removing old coating and applying new coating in an continuous operation without exposing the rod to prolonged wear conditions. The apparatus transitions smoothly from coating removal to re-coating, minimizing the time the pin ends are vulnerable.
3Productivity
If manual coating removal methods are used, then coating can be removed, but significant downtime occurs
Solution Approach 1:
The invention replaces manual mechanical scraping or grinding methods with a specialized mechanical apparatus featuring a cutting bar and deflector that efficiently remove coating. This mechanical system operates faster and more consistently than manual methods, reducing maintenance downtime.
Solution Approach 2:
The apparatus is designed to be self-contained and can be attached to the rod transfer unit, allowing coating removal and re-coating to be performed on-site without requiring rod removal from the well. This self-service capability eliminates transportation time and enables quick turnaround.
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 stripper apparatus enables easy and safe removal of coatings, preserving the rod's integrity and extending its service life by reducing wear and corrosion, particularly at the pin ends, thus minimizing downtime and maintenance costs.
Implementation Method 1
a cutting bar disposed in the frame configured such that the cutting bar contacts the coated rod to cut a strip of coating off of the coated rod
Implementation Method 2
the coated rod contacts the guiding rollers to keep the coated rod positioned within the passageway as the coated rod passes through the stripper
Data Source
AI summary
A stripper for stripping coating off of coated sucker rod is provided. The stripper can have a frame having spaced-apart and opposing end plates with a passageway for receiving the coated rod. Rollers located in the frame guide the coated rod as it passes through the passageway. A cutting bar contacts the coated rod to cut a strip off of the coated rod, leaving a remainder of coating that can be deflected off of the coated rod by a deflector as the coated rod passes through the stripper.