为解决火驱数值模拟组分间转换关系复杂、收敛性差、结果精度低等问题,从火驱燃料沉积角度出发,将反应方程改进为稠油裂解和焦炭燃烧反应方程,并建立具有重复性和准确性的燃料沉积量室内实验方法,求取稠油裂解沉积量,拟合得到改进的模拟方程。结果表明:改进模型更加合理,其粗化后与室内实验结果、加密后的经典方程模型温度场、燃烧前缘分布等模拟结果基本一致,可以真实地描述高温氧化过程,且运算时间大幅度降低。该研究成果对火驱方案编制具有一定指导意义。
In order to solve the problems of complex conversion relationship between components, poor convergence and low accuracy of results during the numerical simulation of the in-situ combustion, the reaction equation was improved to heavy oil cracking and coke combustion from the perspective of fuel deposit of in-situ combustion, and a repetitive and accurate indoor experimental method for fuel deposit rate was established to calculate the deposit rate in heavy oil cracking and obtain an improved simulation equation by fitting. The results showed that the improved model was more reasonable, and the simulation results of the roughened model were basically consistent with these of indoor experimental results, as well as the temperature field, combustion front distribution and other simulation results of the encrypted classical equation model, and with this model, the high-temperature oxidation process could be described factually and the calculation time was greatly reduced. There is much for reference of the study results to the preparation of in-situ combustion scheme.
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