In Situ Combustion (ISC) is a gas injection oil recovery process, the injection gas could be oxygen, air or enriched air. In the ISC process, heat is used as an adjuvant to improve the recovery. The heat is generated within the reservoir by burning a portion of the oil, the burning front is sustained by air injection (Sarathi 1999). The main displacement mechanisms are steam drive, miscible flue gas flooding and, viscosity reduction by oil swelling, temperature increase, among others. The ISC pherhaps is the most efficient enhanced oil recovery method and, possibly the best alternative to produce heavy oil reservoirs. However, despite the economic and technical success of field experiences, the oil industry has been reluctant to its implementation. Mainly, because is difficult to perform the scaling of the process from laboratory to field; any of the methodologies developed is completely reliable.

An important point to understand the characteristics of oxidation/combustion of oil is the kinetic, this is usually obtained from Ramped Temperature Oxidation (RTO) tests and using the Arrhenius equation. However, in the last years have been introduced a new methodology named isoconversional principle. The technique provides direct information of effective activation energy and, it can be used as a screening tool to identify good candidates to ISC. In this paper are presented the results after applying the isoconversional principle in a Colombian heavy oil for the understanding of the oil oxidation/combustion characteristics.

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