Fluororesin Copolymer for High-Temperature Riser Pipes
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Solution Overview
Problem
Conventional fluororesins exhibit low elasticity and inadequate mechanical strength and chemical resistance at high temperatures, particularly above 130°C, making them unsuitable for deepwater oil field applications where high-temperature crude oil is involved.
Innovation Solution
A novel fluororesin copolymer containing tetrafluoroethylene, vinylidene fluoride, and an ethylenically unsaturated monomer, with a storage modulus of 60 to 400 MPa at 170°C, providing improved mechanical strength and low permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fluororesins are used, then chemical resistance is maintained, but mechanical strength and elasticity deteriorate at high temperatures above 130°C
Solution Approach 1:
The patent changes the chemical composition parameters of the fluororesin by incorporating specific monomer units (tetrafluoroethylene, vinylidene fluoride, and trifluorovinyl ether) in controlled ratios. This compositional parameter change enables the resin to maintain mechanical strength and elasticity at high temperatures above 130°C while retaining chemical resistance, directly resolving the contradiction between strength and temperature performance.
Solution Approach 2:
The patent creates a composite fluororesin material by copolymerizing multiple monomer units with different properties. The combination of tetrafluoroethylene (providing chemical resistance), vinylidene fluoride (providing mechanical strength), and trifluorovinyl ether (enhancing high-temperature elasticity) produces a composite material that simultaneously achieves all required properties, resolving the contradiction between strength and temperature performance.
2Reliability
If conventional fluororesins are used, then chemical resistance is maintained, but permeability increases at high temperatures
Solution Approach 1:
The patent modifies the molecular structure parameters of the fluororesin by incorporating trifluorovinyl ether units, which create a more densely packed molecular arrangement. This structural parameter change reduces free volume and molecular chain mobility at high temperatures, thereby maintaining low permeability while preserving chemical resistance, directly resolving the contradiction between reliability and substance loss.
3Temperature
If polyamide or polyvinylidene fluoride are used, then current operating temperature limits are met, but suitability for deeper offshore drilling deteriorates
Solution Approach 1:
The patent fundamentally changes the operating temperature parameter by developing a fluororesin that maintains mechanical strength and low permeability at temperatures above 130°C. This temperature parameter enhancement enables the material to adapt to deeper offshore drilling conditions where higher temperature crude oil is encountered, directly resolving the contradiction between temperature limit and adaptability.
Data Source
AI summary
An object of the present invention it to provide a novel fluororesin that has excellent mechanical strength and chemical resistance, and very low permeability at high temperature. The fluorine resin is a copolymer that includes copolymerized units derived from tetrafluoroethylene, vinylidene fluoride, and an ethylenically unsaturated monomer other than tetrafluoroethylene and vinylidene fluoride. The fluororesin has a storage modulus E′, as measured at 170° C. by a dynamic viscoelasticity analysis, in the range of 60 to 400 MPa.