Study On Kinetics Of Lumped Reaction Of Heavy Oil Burning For Hydrogen Catalytic Modification

In-situ combustion is an important method to enhance oil recovery,and has obvious advantages compared with other technologies.It involves injecting air to the reservoir,generating a series of oxidation reactions at different temperature ranges by chemical interaction between oil and oxygen.The oxidation reaction can release a large amount of heat;the oxygen reacts with a coke like material formed by thermal cracking,they are responsible of generating the heat necessary to sustain and propagate the combustion front,sweeping the heavy oil and upgrading it due to the high temperatures.In the synergy of heat and other driving forces,the purpose of enhanced oil recovery is achieved.However,failures often occur due to the complex reaction mechanism,and therefore have not been widely used.Therefore,this paper mainly analyzes the physical properties of heavy oil,establishes a lumped reaction kinetics model,and uses FOW conversion rate methods and Kissinger differential method to analyze the three aspects of kinetic parameters.Aiming at the catalytic reforming mechanism and product distribution characteristics of heavy oil fired hydrogen,the three sets of total,four sets and six sets of total response network were constructed,and the mathematical expressions of the model dynamics equation were established.The Runge-Kutta method was used.The Monte Carlo method is combined to solve the dynamic parameters of the model.Based on the experiments under different conditions,the optimal reaction conditions were found,the microscopic mechanism of the characteristic reaction of the fire process was revealed,and the kinetic analysis was carried out.Then the kinetics and product selectivity distribution of the catalytic cracking of heavy oil asphaltenes were studied.The overall optimization of the reaction conditions(catalyst type and amount,reaction time and temperature,hydrogen donor and pressure)of the maximum conversion of asphaltenes,the formation of minimum coke,and the high yield of modified oil.It can be seen from the analysis of the calculation results that the activation energy obtained in the literature is within the activation energy range of the hydrocarbon thermal cracking reaction given in the literature.The addition of hydrogen donor can change the activation energy of the reaction,and the overall law is heavy.The component cracking is accelerated,while the light and medium components are fluctuating up and down;The change of yield of each component and the determined activation energy and pre-exponential factor reflected in the lumped model have certain guiding significance for the study of heavy oil fire.