Work String Tubing Hardfacing for OEM Connection Rebuild
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing hardfacing methods are ineffective in restoring worn work string tubing connections without damaging the threads, leading to premature discarding of these tubes.
Innovation Solution
A novel hardfacing process that applies a layer of hardfacing metal composition to the worn regions of the box and threaded pin member of work string tubing, building up the outer diameter to its original OEM size without damaging the threads, using a method that starts the hardfacing at the front end and progresses towards the tapered end to minimize heat accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardfacing methods are used on worn work string tubing connections, then wear resistance is improved, but the threads are damaged
Solution Approach 1:
The box end is pre-heated to a specific temperature range (500-1000°F) before applying the hardfacing material. This preliminary heating action prepares the substrate to receive the hardfacing material without causing thermal damage to the threads, allowing the material to bond properly while preserving thread integrity
Solution Approach 2:
The patent changes the temperature parameter by maintaining the box end within a specific temperature range (500-1000°F) during hardfacing material application. This controlled parameter change prevents excessive heat accumulation that would damage threads while providing enough heat for proper material bonding and wear resistance
2Manufacturing precision
If hardfacing material is applied to rebuild the outer diameter, then the original OEM dimensions are restored, but heat accumulation damages the box end
Solution Approach 1:
The box end is pre-heated to a controlled temperature range (500-1000°F) before applying hardfacing material. This preliminary action ensures the substrate is at the optimal temperature for material bonding without risking excessive heat accumulation that would damage the box end or threads
Solution Approach 2:
The patent implements precise temperature parameter control, maintaining the box end within 500-1000°F during the hardfacing process. This parameter control allows successful restoration of outer diameter dimensions while preventing thermal damage to the box end structure
3Reliability
If work string tubing connections are worn beyond acceptable limits, then they must be discarded, but the tube body remains usable
Solution Approach 1:
Instead of discarding the entire work string tube when connections are worn, the patent recovers the usable tube body by selectively hardfacing only the connection areas (box end or pin end). This allows the majority of the usable material to be retained and reused, reducing waste and extending service life
Solution Approach 2:
The hardfacing treatment is applied locally only to the worn connection areas (box end or pin end) rather than the entire tube. This localized treatment restores connection integrity where needed while preserving the usable tube body, enabling selective rehabilitation of only the affected components
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 process effectively restores the wear resistance and integrity of the work string tubing connections, allowing them to be reused in well operations, thereby extending their service life and reducing waste.
Implementation Method 1
Hardfacing involves the deposition of a hard layer by arc welding or thermal spraying
Implementation Method 2
Hardfacing involves the deposition of a hard layer by arc welding or thermal spraying
Data Source
AI summary
A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.