Pipe Internal Coating Composition for Erosion and Flexure Resistance
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Solution Overview
Problem
Existing coatings for piping components in oil and gas industries are brittle, costly, and prone to erosion due to thermal cycling and flexure, leading to potential leaks and costly replacements.
Innovation Solution
A coating composition comprising a polymeric matrix with dispersed hard particles, where the particles have a Mohs hardness equal to or greater than the erodents and a polymeric layer with a Shore A or Shore D hardness between 30 and 90, designed to dissipate impact energy and protect the polymeric layer from erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic coatings such as tungsten-carbide, silicon-carbide, or iron boride are applied to piping components, then erosion resistance is improved, but the coating becomes brittle under flexure and thermal cycling, leading to cracking and debonding
Solution Approach 1:
The patent applies composite materials by combining a polymeric matrix with dispersed hard particles (such as ceramic or carbide particles) to create a coating that exhibits both erosion resistance from the hard particles and flexibility/toughness from the polymeric matrix. This composite structure resolves the contradiction by integrating materials with complementary properties, allowing the coating to resist erosion while maintaining flexibility under thermal cycling and flexure.
Solution Approach 2:
The patent employs parameter changes by modifying the physical and chemical properties of the coating materials, specifically selecting polymeric matrices with appropriate hardness ranges (Shore A 30-90 or Shore D 0-90) and controlling the size and distribution of hard particles (1 μm to 500 μm). These parameter adjustments optimize the balance between erosion resistance and flexibility, enabling the coating to withstand both erosive forces and thermal/mechanical cycling without cracking.
2Reliability
If higher pipe wall thickness is used to prevent erosion, then erosion damage is reduced, but the cost becomes prohibitive
Solution Approach 1:
The patent applies this principle by using a cost-effective polymeric matrix-based coating that can be applied as a thin layer on existing pipe surfaces, avoiding the need for expensive thick-walled pipes. The coating provides adequate erosion protection for the service life required, making it an economical alternative to increasing pipe wall thickness.
Solution Approach 2:
The patent changes the protective approach from bulk material thickness to surface coating with optimized particle size (1 μm to 500 μm) and concentration ratios (0.5:1 to 20:1 by weight), achieving erosion protection at a fraction of the cost of thicker pipes while maintaining system functionality.
3Reliability
If ceramic coatings are applied via chemical-vapor deposition or high temperature processes, then erosion resistance is improved, but the coating is damaged by thermal cycling due to differential thermal expansion
Solution Approach 1:
The patent changes the thermal properties of the coating by using a polymeric matrix with thermal expansion characteristics closer to the base metal, reducing differential thermal expansion stress. The hard particles are dispersed at controlled concentrations (0.5:1 to 20:1 by weight ratio) to maintain erosion resistance while the polymeric binder accommodates thermal cycling, preventing coating failure.
Solution Approach 2:
The composite structure combines a thermally flexible polymeric matrix with erosion-resistant hard particles, creating a material that balances thermal stability with erosion protection. The polymeric matrix absorbs thermal expansion stresses while the dispersed hard particles provide the necessary erosion resistance, resolving the contradiction between these two requirements.
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 coating effectively mitigates erosion by dissipating impact energy and reducing wear, extending the lifespan of piping components by protecting the polymeric layer from erosive particles.
Implementation Method 1
The polymeric matrix material has a Shore A hardness between 30 and 100 or a Shore D hardness between 0 and 90, such as a hardness between 30 Shore A and 90 Shore D
Implementation Method 2
The plurality of particles has a Mohs hardness equal to or greater than a Mohs hardness of expected erodent materials contained within the produced fluids
Data Source
AI summary
A method to transmit produced fluids in a system configured to recover hydrocarbons from a subterranean formation includes directing produced fluids through a pipe having a coating on its internal surface. The coating includes: a first polymeric layer on the internal surface, the first polymeric layer including a first viscoelastic material and having a hardness between 30 Shore A and 90 Shore D; a second polymeric layer between the internal surface and the first polymeric layer, the second polymeric layer including a second viscoelastic material stiffer than the first viscoelastic material; and a protective layer on the first polymeric layer and having a different composition than the first and second polymeric layers. The protective layer includes a plurality of particles having a Mohs hardness equal to or greater than 7. The method includes dissipating, via the first polymeric layer, forces from erodent materials in the produced fluids impacting the coating.