High Temperature CO2 Corrosion Inhibitor Formulation
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Solution Overview
Problem
Existing corrosion inhibitors are ineffective at high temperatures (150-250°C) in oil field water systems, leading to severe CO2 corrosion of metallic equipment and significant financial and environmental losses.
Innovation Solution
A water-soluble corrosion inhibitor comprising amide compounds, organic alkynols, mercaptan acids, piperidine, mercaptopyridine, and solvents, specifically formulated to provide excellent corrosion inhibition at high temperatures, with components such as ethylene bisoleamide, propynol, mercaptoformic acid, and isopropanol, which adsorb onto metallic surfaces to enhance bonding and inhibit corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing corrosion inhibitors are used at high temperatures (150-250°C), then the corrosion inhibition efficiency decreases, but the financial loss and equipment deterioration increase
Solution Approach 1:
The patent changes the chemical composition parameters of the corrosion inhibitor by incorporating high-temperature stable compounds (amide compounds, organic alkynols, mercaptan acids, piperidine, mercaptopyridine) in specific proportions to maintain effectiveness at 150-250°C. This resolves the contradiction by modifying the inhibitor's molecular structure to resist thermal decomposition while maintaining corrosion protection.
Solution Approach 2:
The patent creates a composite corrosion inhibitor system combining multiple chemical compounds that work synergistically at high temperatures. The composite formulation includes amide compounds (20-40%), organic alkynols (15-20%), mercaptan acids (8-12%), piperidine (8-20%), and mercaptopyridine (8-12%), which collectively provide stable corrosion inhibition efficiency above 92% at elevated temperatures.
2Reliability
If corrosion inhibitors are injected to protect metallic equipment, then the corrosion protection is achieved, but the cost and complexity of the protection system increase
Solution Approach 1:
The corrosion inhibitor performs self-protection by adsorbing onto metallic surfaces and forming protective films automatically during water injection. The inhibitor molecules self-organize on the metal surface without requiring external energy input or complex delivery systems, achieving protection through the inherent chemical affinity between the inhibitor components and the metallic surface.
Solution Approach 2:
The patent optimizes the concentration parameters of individual components within the inhibitor formulation to achieve effective protection at economical concentrations. By carefully controlling the ratio of amide compounds, organic alkynols, mercaptan acids, piperidine, and mercaptopyridine, the system achieves high corrosion inhibition efficiency while minimizing the total amount of chemical required, thereby reducing operational costs.
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 corrosion inhibitor achieves corrosion inhibition efficiencies above 92% in high-temperature conditions, as demonstrated by autoclave coupon tests, while being simple and cost-effective to prepare and implement.
Implementation Method 1
components such as ethylene bisoleamide, propynol, mercaptoformic acid, and isopropanol, which adsorb onto metallic surfaces to enhance bonding and inhibit corrosion
Data Source
AI summary
The present application relates to a high temperature carbon dioxide corrosion inhibitor comprising the following components by mass percent: amide compound 15˜50%, organic alkynol 10˜25%, mercaptan acid 5˜15%, piperidine 5˜25%, mercaptopyridine 5˜15%, and solvent 25˜60%. The corrosion inhibitor has excellent corrosion inhibition for CO2 corrosion of oil field water system at a high temperature (150˜250° C.).