Study On In Situ Combustion Oil Oxidation Mechanism And Laboratory Experiment

In-situ combustion is a method advantages and development potential of research in highly thermal recovery technology, it has recovery high / low-cost advantages, and to adapt to a wide range of its reservoir. Because of the mechanism is very complex and man y problems to be solved, especially not yet intuitive understanding of the mechanism of oxidation of oil in ISC,so limited application in the field. To solve this problem, this paper summarizes the results of the previous researches on the mechanism of che mical burning oil extraction carried out in-depth research.Applied Physics simulation device system to study the low-temperature oxidation of ISC, the nature of high-temperature oxidation; divided the low temperature oxidation reaction, cleavage reaction, high temperature oxidation reaction zone; measure the morphological changes of temperature field; estimates the auto- ignition temperature, air requirement, air-fuel ratio, oxygen utilization and apparent H / C atomic ratio in the combustion of ISC basic parameters; analysis of the different types of low-temperature oxidation reaction product of crude oil physical and chemical properties change, an initial understanding of the mechanism of low temperature oxidation; its conclusions can be on-site design programs to provide a scientific basis.Experiment with different oils(cold 37-45-562 natural oil sands heavy oil wells, high 3-2-75 conventional heavy oil wells, Shu 1-38-330 super heavy, Du 66 conventional heavy oil) combustion index comparison, the corresponding rate of oil obtained advance of the combustion front, and infer the corresponding oil displacement efficiency. The recovery of oil analysis, oil combustion parameters to compare the different blocks of the analysis, the researchers found that after the experiment ISC generated an important marker compound to reflect the high temperature oxidation reaction mechanism driven fire burning- anthracene. Which reveals the main reason this process the combustion reaction oil viscosity, density reduction and other parameters, because the original formation of anthracene this substance does not exist, therefore the reaction after the ISC recovery of oil in the presence of such substances is assumed that judgment is asserted fire flooding successful, anthrace ne substance can be regarded as an important marker compound fire drive successExperiment with different types of crude oil(Shu 1-38-32 super heavy, Du 66 conventional heavy oil, Q i 131 light oil, Shen 625 high pour point oil) at different temperatures(90℃, 110℃, 150℃ and 200℃) made low temperature oxidation of static experiments,,understanding the impact of changes in laws and exhaust components of low-temperature oxidation of the physical and chemical properties of different types of crude oil at different temperatures, initial grasp of low temperature oxidation characteristics and mechanism of action.