Corrosion Inhibitor Composition for Aqueous Media
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Solution Overview
Problem
Corrosion of metal surfaces in aqueous media within the oil and gas industry, particularly in deep-sea operations, is severe due to the presence of corrosive components like brines, organic acids, carbon dioxide, and hydrogen sulfide, leading to costly equipment replacement challenges.
Innovation Solution
A composition comprising specific alkyl and benzyl groups, halogens, and optionally salts, which acts as a synergist when H2S is present, is added to the aqueous medium to inhibit corrosion, forming protective coatings on metal surfaces and suppressing corrosion effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion inhibitors (amines, imidazolines, quaternary ammonium compounds) are used, then corrosion protection is achieved, but alternative effective inhibitors are still sought to improve performance
Solution Approach 1:
The patent employs composite corrosion inhibition by combining a specific corrosion inhibitor composition (comprising compounds with general formulas I and II containing nitrogen-containing heterocyclic rings and hydrocarbon chains) with synergists. This composite approach achieves superior corrosion protection across diverse environments including H2S presence, brines, and organic acids, resolving the need for alternative effective inhibitors while maintaining reliable performance.
2Reliability
If corrosion inhibitors are added to aqueous medium, then corrosion is suppressed, but the complexity of the chemical composition increases
Solution Approach 1:
The corrosion inhibitor is segmented into distinct functional components: compounds with specific molecular structures (formulas I and II) that provide core inhibition activity, and optional synergists that enhance performance in specific conditions. This segmentation allows for manageable complexity while achieving reliable corrosion suppression across multiple corrosive agents.
Solution Approach 2:
The corrosion inhibitor composition is designed with multi-functionality to address various corrosive agents simultaneously (H2S, CO2, brines, organic acids). The general formulas I and II provide a universal structural framework that can inhibit corrosion across different environments, reducing the need for multiple specialized inhibitors and managing overall system complexity.
3Reliability
If protective coatings are formed on metal surfaces, then corrosion is inhibited, but the cost of equipment replacement increases in deep-sea operations
Solution Approach 1:
The corrosion inhibitor composition provides continuous protective action by forming persistent protective coatings on metal surfaces. The synergistic combination of compounds (formulas I and II) with optional synergists ensures sustained corrosion inhibition over time, preventing equipment degradation and avoiding costly replacements in deep-sea operations where replacement is difficult and expensive.
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 composition demonstrates significant corrosion inhibition across various concentrations, providing protection ranging from 44% to 85% as shown in wheel box testing, effectively reducing the need for frequent equipment replacement in harsh environments.
Implementation Method 1
Corrosion inhibitors are usually surface-active compounds that form protective coatings on the surface of metal components
Data Source
AI summary
One or more methods for inhibiting corrosion in an aqueous medium that contain a composition with a specified generic formula are disclosed. The aqueous medium can be contained in an oil or gas pipeline or refinery.