Mohammad Reza Rahimpour
Shiraz University
Iran
Title: Modeling and experimental study of performance behavior in gas condensate reservoirs based on gas relative permeability
Biography
Biography: Mohammad Reza Rahimpour
Abstract
Condensate drop out and accumulation along with high water saturation near the wellbore region result in a decrease in the gas relative permeability. The main objective of this study is to evaluate the feasibility of increasing the relative permeability to gas in limestone cores via use of methanol to either eliminate or minimize the impact of condensate accumulation. In this research, the effect of methanol treatment on condensate-blocked rocks was simulated using the Cubic-Plus-Association (CPA) equation of state. The CPA equation of state was applied to the modeling of two-phase flows through cores for methanol hydrocarbon mixtures due to charge transfer and hydrogen bonding, both of which may strongly affect the thermodynamic properties of such mixtures. Differential equations were solved by means of the orthogonal collocation method, a method particularly attractive for solving nonlinear problems. Core flooding experiments were performed on low-temperature fractured carbonate cores; chosen from one of Iranian carbonate gas. Experimental tests were conducted in 1.5 inch Diameter carbonate cores, using reservoir fluid and synthetic/field brine. Moreover, the results show that methanol treatment can improve gas relative permeability varies from a factor of 1.12 to 1.64. A good agreement was achieved between the experimental results and modeling in the prediction of gas relative permeability before and after methanol treatment when the flowing bottom-hole pressure falls below dew point pressure. These results may help reservoir engineers and specialists to restore the lost productivity of gas condensate.