Evaluating the Impact of Different Families of Scale Inhibitors on Corrosion Inhibitor Performance by Surface Tension and Electrochemical Impedance Spectroscopy Measurements

摘要

It is well known that chemical interactions between scale inhibitor (SI) and corrosion inhibitor (CI) might lead to a reduction in the performance efficiency of both chemicals. Scale and corrosion inhibitors are widely used in the oil and gas industry; thus it is very important to understand how they impact each other's performance. This paper attempted to explain how different families of scale inhibitors impact corrosion inhibitors performance in the presence of each other. For this purpose, this paper addressed fundamental properties of both chemistries and how their interaction can be understood at the molecular level. Ultimately, this more in-depth understanding will allow for a more informed selection of scale and corrosion inhibitors for sub-sea applications and will help develop the next generation of these chemistries. This work explored the possibility of three separate mechanisms (competitive adsorption, SI/CI complexation and surface adhesion) that can cause scale inhibitors to negatively impact corrosion inhibitor performance. The three mechanisms were explored by using Surface Tension (SFT), Liquid Chromatography / Mass Spectrum (LC/MS), and Electrochemical Impedance Spectroscopy (EIS) measurements.