Resin-Coated Oil-Well Pipe Threads for High-Torque Galling Resistance
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Solution Overview
Problem
Large-diameter oil-well metal pipes face challenges in maintaining high torque performance during fastening due to low torque on shoulder resistance, which can lead to loosening and reduced galling resistance without the use of heavy metal powder-containing greases.
Innovation Solution
An oil-well metal pipe with a resin coating containing a resin, solid lubricant powder, and copper phthalocyanine applied to the pin and box contact surfaces, enhancing torque on shoulder resistance and galling resistance without the need for heavy metal greases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy metal powder-containing compound greases are used to improve galling resistance, then galling resistance is improved, but environmental harm increases
Solution Approach 1:
The patent extracts and removes the harmful heavy metal powder components from the compound grease formulation while retaining the essential lubricating and galling-resistant properties through alternative organic-based additives and resin systems
Solution Approach 2:
The patent changes the chemical composition parameters of the grease by substituting heavy metal powders with organic resin-based additives, thereby maintaining galling resistance performance while eliminating environmental harm
2Reliability
If large-diameter oil-well metal pipes are fastened with high torque, then connection security is improved, but torque on shoulder resistance becomes insufficient leading to loosening
Solution Approach 1:
The patent applies a resin coating to the pin and box contact surfaces before fastening operations, preliminarily establishing enhanced friction characteristics that increase torque on shoulder resistance and prevent loosening during high-torque fastening of large-diameter pipes
3Ease of operation
If the pin and box contact surfaces experience repeated strong friction during fastening and loosening, then connection functionality is maintained, but galling occurs reducing durability
Solution Approach 1:
The patent introduces a resin coating as an intermediary layer between the pin and box contact surfaces, which mediates the friction interaction by providing a protective interface that reduces direct metal-to-metal contact and prevents galling during repeated fastening and loosening operations
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 enables high torque fastening and improved galling resistance for large-diameter oil-well metal pipes, ensuring secure connections and extended durability without environmental impact from heavy metals.
Implementation Method 1
a resin coating containing a resin, solid lubricant powder and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface
Data Source
AI summary
An oil-well metal pipe according to the present disclosure has a pipe main body including a first end portion and a second end portion. The pipe main body includes a pin formed at the first end portion, and a box formed at the second end portion. The pin includes a pin contact surface including an external thread part, and the box includes a box contact surface including an internal thread part. The oil-well metal pipe according to the present disclosure also includes a resin coating containing a resin, a solid lubricant powder, and copper phthalocyanine on or above at least one of the pin contact surface and the box contact surface.