T his paper focuses on the study of the influence of rock matrix on oxidation kinetics through the analysis of kinetic experiments for a Colombian heavy crude using various porous media: synthetic sand, drilling cuttings, reservoir core and outcrop. The main objective is to evaluate the kinetic behavior of packing with porous media other than the original rock matrix to determine the feasibility of using them as a replacement for the original reservoir rock, while maintaining the representativeness of the results. The importance resides on the fact that the observed kinetics can be used to assess the technical feasibility for the implementation of an air injection process.The experimental design involves performing kinetic cell tests varying only the porous medium, while keeping the same fluid and the same operating conditions. For the dataset compiled, variables such as: oxygen consumed, carbon oxides produced and H/C ratio were determined. The results showed that it is possible to make reliable laboratory studies for air injection process using packing other than reservoir core as a more convenient alternative. ABSTRACT 44 Ofoco deste trabalho é o estudo da influência da matriz de rocha na cinética de oxidação através da análise de experimentos cinéticos realizados para um petróleo bruto pesado colombiano utilizando diferentes tipos de meio poroso: areia sintética, cortes de perfuração, afloramento e núcleo. O principal objetivo é avaliar o comportamento cinético de empacotamentos com meios porosos diferentes à matriz original, para determinar a viabilidade de usá-los como substituição da rocha original da jazida, mantendo a representatividade dos resultados. A importância reside em que a cinética observada será utilizada para avaliar a viabilidade técnica da implantação do processo de injeção de ar.O desenho experimental inclui a realização de ensaios de célula cinética variando apenas o meio poroso, mantendo o mesmo fluxo e iguais condições de operação. Ao conjunto de dados coletados foram determinadas variáveis como: oxigênio consumido, óxidos de carbono produzidos e relação H/C. As análises realizadas mostraram que é possível efetuar estudos laboratoriais confiáveis para o processo de injeção de ar utilizando empacotamentos alternativos ao núcleo da jazida. E ste trabajo se centra en el estudio de la influencia de la matriz de roca en la cinética de oxidación a través del análisis de experimentos cinéticos realizados para un crudo pesado colombiano utilizando diferentes tipos de medio poroso: arena sintética, cortes de perforación, afloramiento y núcleo. El objetivo principal es evaluar el comportamiento cinético de empaquetamientos con medios porosos diferentes a la matriz original, para determinar la factibilidad de usarlos como reemplazo de la roca original del yacimiento, manteniendo la representatividad de los resultados. La importancia radica en que la cinética observada se utilizará para evaluar la factibilidad técnica de la implementación del proceso de inyección de aire.El diseño experimental com...

The 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, inteded 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 crude.