Ionic Liquid Corrosion Inhibitors for Subterranean Wells
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Solution Overview
Problem
Existing corrosion inhibition methods in subterranean operations and pipelines are inadequate in effectively preventing corrosion in corrosive environments, particularly those containing acidic conditions, water vapor, oxygen, chloride or bromide ions, carbon dioxide, and hydrogen sulfide, which can lead to significant material deterioration.
Innovation Solution
The use of corrosion inhibitor additives comprising ionic liquids with specific organic cations and anions, such as sulfonate and carboxylate anions, and ammonium cations, which form a protective film on metal surfaces, inhibiting corrosion by adsorption and physically or chemically blocking corrosive compounds, without the use of volatile solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional corrosion inhibitors are used, then some corrosion protection is provided, but the inhibition efficiency is insufficient in highly corrosive environments
Solution Approach 1:
The patent changes the chemical parameters of corrosion inhibitors by using ionic liquids with specific organic cations (ammonium, imidazolium, pyrrolidinium, morpholinium, pyridinium, pyrazolium, triazolium, sulfonium, or phosphonium) and organic anions (sulfonate, carboxylate, phosphonate, or thiolate). This parameter change enables the inhibitor to form more effective protective films on metal surfaces, achieving up to 99% corrosion inhibition efficiency in highly corrosive environments containing CO2, H2S, chloride ions, and acidic conditions.
Solution Approach 2:
The patent employs composite ionic liquid structures combining specific cation-anion pairs to create corrosion inhibitors with enhanced performance. The composite nature of these ionic liquids, with tailored cation and anion combinations, allows them to provide superior corrosion protection compared to conventional single-component inhibitors, particularly in complex corrosive environments with multiple harmful factors acting simultaneously.
2Reliability
If traditional corrosion inhibitors are applied, then corrosion protection is achieved, but volatile solvents are required which pose environmental and safety concerns
Solution Approach 1:
The patent extracts and eliminates volatile solvent components from traditional corrosion inhibitor formulations. By using ionic liquids as the sole active ingredient without requiring volatile organic solvents for dissolution or application, the invention removes the harmful volatile emissions while maintaining effective corrosion protection. The ionic liquids can be applied directly in aqueous or non-aqueous solutions without volatile carriers.
Solution Approach 2:
The ionic liquids create an inert protective film on metal surfaces that acts as a barrier between the corrosive environment and the metal substrate. This inert protective layer prevents harmful interactions between corrosive compounds (CO2, H2S, chloride ions, acids) and the metal surface, providing corrosion protection without requiring volatile solvents that would evaporate and create harmful atmospheric conditions.
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 additives significantly reduce corrosion rates, achieving up to 99% inhibition efficiency across various concentrations, temperatures, and oil/water fractions, providing effective protection for metals like carbon steel and ferrous alloys in corrosive environments.
Implementation Method 1
form a protective film on metal surfaces, inhibiting corrosion by adsorption and physically or chemically blocking corrosive compounds
Implementation Method 2
The corrosion of metal surfaces occurs when metal surfaces are contacted by a corrosive environment containing an oxidizer (e.g., an electrochemical oxidizer, a chemical oxidizer or the like)
Data Source
AI summary
Methods for providing corrosion inhibition in conduits, containers, and wellbores penetrating subterranean formations are provided. In some embodiments, the methods include contacting a metal surface with a fluid that includes a corrosion inhibitor additive, in certain embodiments, the corrosion inhibitor additive includes an tonic liquid.