Resin-Coated Oil-Well Pipe Threads for High-Torque Galling Resistance
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Solution Overview
Problem
Oil-well metal pipes used in horizontal drilling are prone to loosening due to excessive torsion and bending, requiring higher torque fastening to maintain stability and prevent galling without using environmentally harmful compound greases.
Innovation Solution
An oil-well metal pipe with a resin coating containing specific components (50.0 to 99.5% resin, 0 to 10.0% wax, 0 to 30.0% fluorine-based additive, 0 to 10.0% graphite, 0 to 30.0% rust preventive pigment, 0 to 10.0% coloring pigment, and 1.5 to 50.0% magnesium silicate hydroxide powder or 0.5 to 30.0% TiO2) that satisfy the ratio (W+F+G)/(M+T)≤5.00, enhancing shear strength to withstand high torque.
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 removes heavy metal powders (Pb, Zn, Cu) from the compound grease formulation, extracting the harmful component while retaining the lubricating function through alternative additives and grease base selection
Solution Approach 2:
The patent changes the chemical composition parameters of the grease by specifying alternative additives and grease bases that provide adequate galling resistance without heavy metals, thereby resolving the environmental harm issue while maintaining reliability
2Strength
If resin coating is applied to increase shear strength, then torque capacity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the resin coating parameters including thickness range (5-50 μm), composition ratios, and curing conditions to achieve adequate shear strength enhancement while keeping the manufacturing process manageable and cost-effective
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 resin coating increases the shear strength of the oil-well metal pipe, allowing it to withstand higher torque and prevent loosening during horizontal drilling, thereby improving durability and galling resistance.
Implementation Method 1
the resin coating increases the shear strength of the oil-well metal pipe, allowing it to withstand higher torque
Implementation Method 2
a contact surface of at least one member among the pin and the box has a viscous liquid or semisolid lubricant coating
Implementation Method 3
a dry solid coating that is formed on the lubricant coating
Data Source
AI summary
An oil-well metal pipe according to the present disclosure includes a resin coating on or above at least one of a pin contact surface and a box contact surface. The resin coating contains: a resin: 50.0 to 99.5 mass %, a wax: 0 to 10.0 mass %, a fluorine-based additive: 0 to 30.0 mass %, graphite: 0 to 10.0 mass %, a rust preventive pigment: 0 to 30.0 mass %, a coloring pigment: 0 to 10.0 mass %, a coupling agent: 0 to 10.0 mass %, and one type or two types selected from a group consisting of a magnesium silicate hydroxide powder: 1.5 to 50.0 mass % and TiO2: 0.5 to 30.0 mass %; and satisfies Formula (1).(W+F+G)/(M+T)≤5.00 (1)