Aldehyde-Thiol Corrosion Inhibitors for Sour Environments
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional corrosion inhibitors used in subterranean applications are ineffective in sour conditions, toxic to aquatic organisms, and expensive, especially when dealing with high temperatures and pressures, leading to significant corrosion damage and operational costs.
Innovation Solution
The use of reaction products formed from aldehydes with thiol and/or amine functionalized ring structures as corrosion inhibitors, which provide improved corrosion protection in acidic environments, including sour conditions, by forming effective barriers on metal surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quaternary ammonium compounds are used as corrosion inhibitors in high temperature applications, then corrosion protection is improved, but toxicity to aquatic organisms increases and cost increases
Solution Approach 1:
The patent changes the chemical structure parameters of corrosion inhibitors by using aldehydes with thiol and/or amine functionalized ring structures instead of conventional quaternary ammonium compounds. This structural parameter change maintains effective corrosion protection while reducing environmental toxicity.
Solution Approach 2:
The patent employs readily available aldehyde and thiol/amine compounds that can be easily synthesized or obtained, replacing expensive and difficult-to-obtain quaternary ammonium compounds. The simpler molecular structures are more economical while maintaining inhibitor functionality.
2Reliability
If quaternary ammonium compounds with high molecular weights and high degrees of aromaticity are used to achieve high corrosion protection, then corrosion inhibition is improved, but availability and production cost worsen
Solution Approach 1:
The patent changes the molecular weight and aromaticity parameters by using aldehydes with thiol and/or amine functionalized ring structures. These compounds have lower molecular weights and reduced aromaticity compared to high-performance quaternary ammonium compounds, making them more available and easier to produce while maintaining corrosion inhibition effectiveness.
Solution Approach 2:
The patent uses readily available aldehyde and thiol/amine building blocks that are commercially accessible and easy to synthesize, replacing expensive, specialized quaternary ammonium compounds with high molecular weights and high aromaticity that are not readily available.
3Reliability
If conventional corrosion inhibitors are used in sour conditions, then corrosion protection is attempted, but effectiveness decreases because the organic portion reacts with H2S
Solution Approach 1:
The patent extracts or removes the vulnerable organic portions from conventional inhibitors that react with H2S. By using aldehydes with thiol and/or amine functionalized ring structures, the inhibitor design eliminates the reactive organic components that would otherwise degrade in sour conditions, achieving stability in H2S environments.
Solution Approach 2:
The patent introduces aldehyde molecules as intermediaries that react with H2S to form stable products, protecting the metal surface. The thiol and amine functionalized ring structures serve as stable intermediaries that do not degrade in sour conditions, unlike conventional organic inhibitor portions.
4Reliability
If copper and antimony-based intensifiers are used in sour conditions, then corrosion protection is enhanced, but they precipitate out of solution
Solution Approach 1:
The patent removes copper and antimony-based intensifiers from the inhibitor formulation for sour service applications. By using aldehydes with thiol and/or amine functionalized ring structures alone, the formulation eliminates components that precipitate in sour conditions while maintaining corrosion protection through the stable aldehyde-thiol/amine reaction products.
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
These corrosion inhibitors demonstrate enhanced performance over conventional molecules, offering superior protection against corrosion in high-temperature and high-pressure sour environments while being environmentally friendly, thus reducing maintenance and operational costs.
Implementation Method 1
reaction products formed from aldehydes with thiol and/or amine functionalized ring structures as corrosion inhibitors, which provide improved corrosion protection in acidic environments, including sour conditions, by forming effective barriers on metal surfaces
Data Source
AI summary
Provided herein are methods and compositions that include a method comprising contacting a metal surface with an acidic fluid comprising a corrosion inhibitor that comprises a reaction product formed from a direct or an indirect reaction of an aldehyde with a thiol and/or an amine functionalized ring structure. A composition provided includes an acidic treatment fluid that comprises an aqueous-base fluid, and acid, and a corrosion inhibitor that comprises a reaction product formed from a direct or an indirect reaction of an aldehyde with a thiol and/or an amine functionalized ring structure.