Experimental and Theoretical Quantification of Non-Equilibrium Phase Behaviour and Physical Properties of Foamy Oil under Reservoir Conditions

[+] Author and Article Information
Yu Shi

University of Regina Regina, Saskatchewan, Canada

Daoyong Yang

University of Regina Regina, Saskatchewan, Canada

1Corresponding author.

ASME doi:10.1115/1.4036960 History: Received March 02, 2017; Revised May 03, 2017


A novel and pragmatic technique has been proposed to quantify non-equilibrium phase behaviour together with physical properties of foamy oil under reservoir conditions. Experimentally, constant-composition expansion (CCE) experiments at various constant pressure decline rates are conducted to examine non-equilibrium phase behaviour of solvent-CO2-heavy oil systems. Theoretically, the amount of evolved gas is firstly formulated as a function of time, and then incorporated into real gas equation to quantify non-equilibrium phase behaviour of the aforementioned systems. Good agreements between the measured and calculated volume-pressure profiles have been achieved, while both amounts of evolved gas and entrained gas as well as compressibility and density of foamy oil were determined. A larger pressure decline rate and a lower temperature are found to result in a lower pseudo-bubblepoint pressure and a higher expansion rate of the evolved gas volume. Physical properties of the oleic phase under non-equilibrium conditions follow the same trends as those of conventionally undersaturated oil under equilibrium conditions when pressure is higher than the pseudo-bubblepoint pressure. However, there is an abrupt increase of compressibility and decrease of density associated with pseudo-bubblepoint pressure instead of bubblepoint pressure. The amount of dispersed gas in the oleic phase is found to impose a dominant impact on physical properties of the foamy oil. Compared with CCE experiment at constant volume expansion rate, a rebound pressure and its corresponding effects on physical properties cannot be observed in the CCE experiments at constant pressure decline rate.

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