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espanolEl principal desafio para predecir el desempeno en campo de un proceso de inyeccion de aire es lograr entender el proceso de oxidacion del crudo y contar con un modelo cinetico de reacciones que permita predecir el comportamiento del proceso en un simulador numerico de yacimientos, bajo diferentes condiciones operacionales. Recientemente, se ha incorporado una tecnica denominada Principio Isoconversional para el estudio de la cinetica de las reacciones asociadas a la oxidacion del petroleo durante la inyeccion de aire, partiendo de la informacion suministrada por pruebas de oxidacion con rampa de temperatura (RTO - Ramped Temperature Oxidation). En diferentes trabajos publicados, se ha utilizado el analisis isoconversional para estudiar las caracteristicas oxidativas de diferentes sistemas roca - fluido, identificar grupos de reacciones dominantes durante el proceso oxidativo del crudo y estimar la energia de activacion efectiva para cada una de las reacciones identificadas. Sin embargo, en ninguno de ellos se ha establecido un procedimiento que permita estimar el factor pre-exponencial, debido a que este no es una medida directa de los metodos isoconversionales. En este articulo se presenta un procedimiento matematico para la aproximacion del factor pre-exponencial a partir de la aplicacion del metodo isoconversional de Friedman, orientado a la caracterizacion de la cinetica de las reacciones asociadas al proceso de Combustion In Situ, este procedimiento fue validado con informacion experimental y un modelo cinetico propuesto en la literatura para modelar el comportamiento oxidativo de un crudo pesado. EnglishThe main challenge to predict at field scale the performance of an air injection process is to understand the oil oxidation process and to have a kinetic model of reactions enabling the prediction of process behavior in a reservoir numerical simulator, under different operating conditions. Recently, the Isoconversional Principle has been implemented for studying the kinetics of reactions associated with oil oxidation during air injection, based on Ramped Temperature Oxidation tests (RTO). In different published papers, the isoconversional analysis has been used to study the oxidation characteristics of different rock-fluid systems, identify groups of dominant reactions during the crude oil oxidation process, and estimate the effective activation energy for each of the identified reactions. However, in none of them has a procedure been established for estimating the pre-exponential factor, as this is not a direct measure of isoconversional methods. In this article, a mathematical procedure is proposed for estimating the pre-exponential factor based on the application of Friedman's isoconversional method, intended for characterizing the kinetics of the reactions associated with the In Situ Combustion process. This procedure was validated with experimental information and a kinetic model proposed in the literature to model the oxidation behavior of heavy oil.

Methodology for calculating the pre-exponential factor using the isoconversional principle for the numerical simulation of the air injection process