研究表明：（1）稠油在火驱低温氧化阶段以加氧反应为主，并伴随少量的裂解

Studies have shown that: (1) In the low-temperature oxidation stage of fire flooding, the heavy oil is dominated by oxygenation reaction, accompanied by a small amount of cracking reaction; (2) The physical properties of the crude oil become worse at the low-temperature oxidation stage below 200℃, and the viscosity is at 200℃ , Density reaches its maximum value, and then gradually decreases as the temperature rises. This is mainly affected by the content of non-hydrocarbons, asphaltenes and oxygen elements in the crude oil; (3) Due to the low degree of cracking, the carbon isotope of crude oil and group components does not occur Obvious isotope fractionation; (4) Exhaust gas data shows that oxygen-containing compounds such as aldehydes, ketones, alcohols or carboxylic acids are generated during low-temperature oxidation of heavy oil fire flooding. This study explored the changes of crude oil and tail gas during low-temperature oxidation of heavy oil fire flooding, and calculated the low-temperature oxidation reaction equation of heavy oil at different temperatures.

The results show that: (1) heavy oil in the low-temperature oxidation phase of fire drive mainly oxygenation reaction, accompanied by a small amount of lysation reaction; The density reaches the maximum value, and then decreases gradually as the temperature increases, which is mainly affected by the content of non-hydrocarbons, asphalt and oxygen elements in crude oil, and (3) the carbon isotope fractionation of crude oil and family members does not occur due to the low degree of cracking. ;(4) exhaust data show that oxygen-containing compounds such as aldehyde, ketones, alcohols, or pyric acid are produced during low-temperature oxidation driven by heavy oil fire. The study explores the law of change between crude oil and exhaust gas in the process of low-temperature oxidation of heavy oil fire drive, and calculates the equation of low-temperature oxidation reaction of heavy oil at different temperatures.

The results show that: (1) during the low-temperature oxidation stage of heavy oil, oxygenation reaction is the main reaction, accompanied by a small amount of cracking reaction; (2) the physical properties of heavy oil become worse in the low-temperature oxidation stage below 200 ℃, and the viscosity and density reach the maximum value at 200 ℃, and then gradually decrease with the increase of temperature, which is mainly affected by the content of non hydrocarbon, asphaltene and oxygen elements in the crude oil; (3) due to the low-temperature oxidation of heavy oil, the physical properties of the crude oil become worse (4) the tail gas data show that the oxygen-containing compounds such as aldehydes, ketones, alcohols or carboxylic acids are formed during the low-temperature oxidation of heavy oil by fire flooding. This study explored the variation of crude oil and tail gas during the low temperature oxidation process of heavy oil by fire flooding, and calculated the low temperature oxidation reaction equation of heavy oil at different temperatures.<br>