No abstract

No abstract

No abstract

The effects of sand erosion on inhibitor performance have been examined in a flow loop using an impinging jet test cell and different techniques such as long-term weight loss (WL), linear polarization resistance (LPR), potentiodynamic polarization (PDYN), 3-D profilometry, and electrochemical impedance spectroscopy (EIS). Inhibition mechanisms and the relation between inhibitor concentration and corrosion penetration rate are described by the Flory-Huggins, Frumkin, Temkin, and Langmuir adsorption isotherms. Flow loop tests indicated that sand particle erosion can decrease the efficiency of an imidazoline-based inhibitor by removing the inhibitor protective layer from the surface. Therefore, an increased concentration of inhibitor is needed during sand production to achieve the same effectiveness. It was shown that an inhibitor adsorption isotherm can be integrated into a mechanistic model for prediction of carbon dioxide (CO2) corrosion to predict CO2 corrosion rates as a function of inhibitor concentration. Also, the inhibitor adsorption isotherm has been modified as a function of erosivity to predict the effect of erosivity on corrosion inhibition. One novel approach is discussed for predicting the inhibited erosion-corrosion rate based on the modified inhibitor adsorption isotherms combined with mechanistic models for predicting CO2 corrosion rates and sand particle erosion rates.

No abstract