Abstract
In situ combustion (ISC) has been regarded as an efficient technique for the exploitation of heavy oil reserves. In this work, the thermal behavior of one heavy crude oil and the fractions of its saturates, aromatics, resins, and asphaltenes (SARA) during combustion was thoroughly investigated using high-pressure differential scanning calorimetry. Two typical isoconversional methods were adopted to determine the variation of activation energy (E) and frequency factor (Ar) versus conversion degree in the course of the reaction, followed by the evaluation of the reaction model, f(α), via the master plot method. The results indicated that the heavy oil encountered larger thermal release caused by low-temperature oxidation (LTO) reactions rather than high-temperature oxidation (HTO) reactions, suggesting that appreciable heat could be available within the low-temperature range. Saturates showed a notably apparent heat release in the LTO reactions. For aromatics, the exothermic effect at the LTO stage was appa...
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