Estudio de la Velocidad de Corrosión en una Tubería de Producción de Petróleo con Relación a la Dosificación de un Inhibidor Químico

Abstract

In the present work, the corrosion rate was studied in relation to the dosage of an inhibitor, for which oil wells 2H, 3H, 4H and 7W were selected since they were the most corrosive at the site. With the evaluation of the LPR probs the requeried concentration was determined to be; 50,10; 106,00; 59,50 and 40,10 ppm respectively. Subsequently, three oil wells with similar characteristics were selected; 2N, 20N and 5W, which require 38,67; 47,90 and 11,67 ppm inhibitor respectively. The analysis of the operational variables allowed the conclusion that salinity, fluid velocity and corrosivity of the oil formation are the most influential variables with a percentage of 15, 15 and 70% respectively. Using this relationship, a corrosivity plot was developed to predict the appropriate concentration of inhibitor in the other oils wells in the site. Finally the corrosion profile generated by the French Creek software was validated with the profile obtained from the coupons. The profiles were determined to differ since the software considers the corrosivity as the capacity of the formed scale dissolution and not the dissolution of iron in the oil pipe, which is measured by the coupons.