Abstract

SANDIANES-VEGA, Bibiana; URUCHURTU-CHAVARIN, Jorge; CALDERON-SECADA, Osmar  and  CALDERON-SANCHEZ, Osmar. Study of a Corrosion Inhibitor in Acid Medium. RTQ [online]. 2012, vol.32, n.2, pp. 126-136. ISSN 2224-6185.

Acid treatment in oil wells is one of the most corrosive technologic process for metallic installations, since it involves concentrated acid solutions, high temperature under long exposure periods amongst others. It is imperative the use of corrosion control methods, being the most adequate and common the use and addition of inhibitors in the acid environment, the world over. Nevertheless, in most of these products the corrosion protection diminishes as a function of time, therefore there are just a few that satisfy the action conditions needed to be used under these corrosion conditions and its cost are increased in the world market. Cuba has no products that satisfy this composition and application standards and the chemical composition of the imported international products is unknown. The objective of the present work was to study a commercial inhibitor a highly used oil well acid treatment inhibitor, which enabled to compare with a further development of a national inhibitor product development of a similar efficiency but with a lower cost. Analytical techniques were used to identify structure and composition previously fractionally separated, as well as electrochemical evaluation for the inhibitor performance and efficiency. It was demonstrated that the active component rest in the residual by-product obtained, behaving in a similar way to the original product, a typical behaviour observed for the mix adsorption reaction inhibitors, recommended for acid media. Part of his work was made in the Electric Research Institute in Mexico with a research scholarship given by the Mexican Foreign Relations Secretary.

Keywords : corrosion; inhibitor; acid media; oil well acid treatment.

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