Micelles.
Dynamic Optimisation.


Corrosion Inhibitor Analysis

Micelles as indicators of optimal injection

Surfactant based inhibitors are often at the frontline of internal corrosion protection strategies. The ability to accurately monitor the concentrations of active components of the CI formulation is of key importance in determining the diffusion of chemical throughout a production system.

However, traditional methods of analysis, such as methyl orange residuals, are prone to high levels of error due to interferent species within production systems, ranging from crude oil to competing amine chemistry. Time lapse between sample collection and analysis also leads to changes in water chemistry that can afford inaccurate results when shipping to dedicated analysis labs.

Micelles are aggregate species formed when surfactant components in a solution exceed a concentration known as the Critical Micelle Concentration, or CMC. When micelles are observed, a complete surface coverage has been reached and further surfactant addition has no additional inhibitory effect.

Corrosion Inhibitor Analysis

Micelles as indicators of optimal injection

Surfactant Based Corrosion Inhibitors
Defining Optimal Dose
Micelles and Optimisation

Surfactant based inhibitors are often at the frontline of internal corrosion protection strategies. The ability to accurately monitor the concentrations of active components of the CI formulation is of key importance in determining the diffusion of chemical throughout a production system.

However, traditional methods of analysis, such as methyl orange residuals, are prone to high levels of error due to interferent species within production systems, ranging from crude oil to competing amine chemistry. Time lapse between sample collection and analysis also leads to changes in water chemistry that can afford inaccurate results when shipping to dedicated analysis labs.

Micelles are aggregate species formed when surfactant components in a solution exceed a concentration known as the Critical Micelle Concentration, or CMC. When micelles are observed, a complete surface coverage has been reached and further surfactant addition has no additional inhibitory effect.

Maximum inhibition should be observed around the CMC since additional surfactant molecules lead to the formation of micelles and do not contribute to inhibition.
Shell Corrosion Specialist, NACE CORROSION 2010

Factors Influencing CI Availability

Why Dynamic Monitoring Is Important

Although production systems are constantly in flux, corrosion inhibitors are generally injected at a constant volume over long periods of time. Where changes are made to the injection rate, decisions are often made on the basis of old data or on that generated by high interference techniques that may provide inaccurate assessments of chemical availability.

The following factors have a role on the attrition of CI surfactant and its availability to protect systems. Regular assessment of the available surfactant within a system, by micelle analysis, can provide an excellent indication of the protective health of a system. CoMic™ is the only platform that can provide on-site analysis of micelle presence and optimised dose indicators.

Factors Influencing CI Availability

Why Dynamic Monitoring Is Important
Equipment Failure
Variable Water Cut
Production Solids
Chemical Decomposition

Although production systems are constantly in flux, corrosion inhibitors are generally injected at a constant volume over long periods of time. Where changes are made to the injection rate, decisions are often made on the basis of old data or on that generated by high interference techniques that may provide inaccurate assessments of chemical availability.

The following factors have a role on the attrition of CI surfactant and its availability to protect systems. Regular assessment of the available surfactant within a system, by micelle analysis, can provide an excellent indication of the protective health of a system. CoMic™ is the only platform that can provide on-site analysis of micelle presence and optimised dose indicators.

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