Abstract
Maintaining the reservoir pressure by gas injection is frequently adopted in the development of gas condensate reservoir. The aim of this work is to investigate the phase behavior of condensate oil and remaining condensate gas in the formation under gas injection. The DZT gas condensate reservoir in East China is taken as an example. The multiple contact calculation based on cell-to-cell method and phase equilibrium calculations based on PR Equation of State (EOS) were utilized to evaluate the displacement mechanism and phase behavior change. The research results show that different pure gas has different miscible mechanism in the displacement of condensate oil: vaporizing gas drive for N2 and CH4; condensing gas drive for CO2 and C2H6. Meanwhile, there is a vaporing gas drive rather than a condensing gas drive for injecting produced gas. When the condensate oil is mixed with 0.44 mole fraction of produced gas, the phase behavior of the petroleum mixture reverses, and the condensate oil is converted to condensate gas. About the reinjection of produced gas, the enrichment ability of hydrocarbons is better than that of no-hydrocarbons. After injecting produced gas, retrograde condensation is more difficult to occur, and the remaining condensate gas develops toward dry gas.
Highlights
During the development of gas condensate reservoir, the retrograde condensation happened when the reservoir pressure drops below the dew point pressure
The main focus of this paper is to evaluate the phase behavior of condensate oil and remaining condensate gas in the formation with gas injection
In order to evaluate the influence of injected gas type on the phase behavior of condensate oil in the formation, the multiple contact between different pure gas and condensate oil were performed using the cell-to-cell calculation method presented by Metcalfe et al (1973), Pederson et al (1986) and Jaubert et al (1998)
Summary
During the development of gas condensate reservoir, the retrograde condensation happened when the reservoir pressure drops below the dew point pressure. In order to prevent the participation of condensate oil, maintaining the reservoir pressure is significant for the efficient development of gas condensate reservoir. The main focus of this paper is to evaluate the phase behavior of condensate oil and remaining condensate gas in the formation with gas injection. The phase behavior of condensate oil mixed with different mole fraction of produced gas was evaluated. Minimum Miscible Pressure (MMP) and Minimum Miscible Enrichment (MME) for injecting produced gas were obtained by multiple-contact calculations. The phase behavior of remaining condensate gas mixed with different mole fraction of produced gas was analyzed in detail
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