Research on characteristics of fire flooding zones based on core analysis

In order to better understand the combustion process and the reactions in the process of fire flooding, it is necessary to study the zone characteristics and the advancing law of fire flooding. Firstly, temperature dynamic characteristics of observation well reveal that the combustion of HQ1 fire flooding pilot test is characterized by wet combustion. Then, a series of core tests (rock pyrolysis, mercury intrusion, crude oil group composition analysis, rock and mineral composition) are utilized to analyze the cores from Xinjiang HQ1. By comparing the difference of characteristics between the burned and unburned zone, the result shows that coke deposition occurs under the burning surface, where the coke deposition zone is. And above the burning surface, kaolinite is converted into illite or montmorillonite. There is evidence to show that montmorillonite will converted into illite under a dry combustion condition(350 °C). These features of rock and mineral can be used to evaluate fire flooding process.