부산대학교 도서관

Permeability reduction in porous media during primary oil recovery and using the enhanced oil recovery methods are complicated. In this work, a modified model based on cylindrical coordinates and four phase black oil model (oil, water, gas, and asphaltene) was developed to account permeability reduction in porous media. The developed model was verified using data given in literature. The existing models are based on Cartesian coordinate and use only two material balance equations based on asphaltene and oil phases in the porous media sample. Subsequently, this model has been used for examining the effect of well production rate and the initial reservoir permeability on the asphaltene deposition behavior in a typical reservoir during flooding injection process. The results show that the developed model based on cylindrical coordinates and four phase black oil is more accurate than those obtained from previous models and is in good agreement with the experimental data reported in literature. Also, the results of proposed model indicate that at a fixed permeability, with increase in the production rate, the amount of asphaltene deposits will increase. However, an increase in the reservoir permeability will decrease the deposition rate because of the existence of further channels for flow. [ABSTRACT FROM AUTHOR]